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Panasonic CU-3KS19NBU Service Manual

1. 50 B aq E DES RE ee ae l ue am LA a o e N 4 minute cycle Fig 1 67 lt Low Ambient Cooling Operation gt When the outdoor air temperature reaches 57 2 F 14 C or less during the cooling operation the operation mode is switched to low ambient cooling operation When the mode is switched from cooling opration to low ambient cooling operation the compressor is stopped for 150 seconds temporarily When the mode has been switched to low ambient cooling operation the outdoor fan speed is lowered as the outdoor air temperature falls Outdoor fan speed rpm 32 F C Outdoor air temperature When the outdoor air temperature reaches 62 6 F 17 C or more during the low ambient cooling operation the operation mode is switched to cooling operation The following protective actions are available to prevent the compressor from operating with abnormal loads At that time they initiate thermo off stopping the outdoor unit of the air conditioner Outdoor air temp F 14 10 8 6 13 Compressor Indoor fan 68 7 2 Protective Functions The numerical values such as temperature frequency time and current in parentheses are an example of CU 4KS31NBU and the values are different from the other models 7 2 1 Current Control The operating current may rise as a result of
2. Baffle plate Screw 5 82 x 15 82 4 x 12 mm tapping Bolt 15 64 x 19 32 25 32 M6 x 15 20 mm Nut 15 64 M6 Washer Spring washer Q ty Remarks Item Q ty Remarks 1 Baffle plate 1 2 Attached to outdoor unit Bolt 15 64 x 13 32 19 32 M6 x 10 15 mm 4 3 Nut 15 64 M6 4 3 Washer 4 3 Spring washer 4 3 12 3 Installation procedure 1 Air Intake Baffle 1 Left side 1 Remove the top panel from the unit 2 Remove the panel side L and drill 3 holes of 1 4 inch 6 5 mm at the prescribed position 3 Install the windbaffle on the unit using field supply bolts and nuts 4 Recommended bolts to be used are 15 64 M6 ISO standard and the recommended length of the bolts is between 19 32 25 32 inch 15 20 mm 5 Use washers and spring washers to tightly fasten the windbaffle to the unit 2 Right side 1 Remove the top panel from the unit 2 Use 2 preholes on the panel side R to install the baffle plate 3 Remove the panel side R from the unit by removing the screws These screws are used in step 4 below 4 Put sandwich the windbaffle between the unit and the panel side R then install the windbaffle on the unit using the above screws Be careful not to damage the screw holes Panel top Panel front Panel sen lt WWW Panel side L IIIT o Fig 5i Air Discharge Ba
3. Le o 08 ty z zz 90 ao 104 BUS air 2 C 2 Operating current performance chart Operating current A Outdoor air temperature F C 3 Indoor discharge air performance chart SI ii Dua Indoor discharge air temperature F C 1 lair temp 86 F HE c HT p 77 BE 25 30 35 a Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 45 Outdoor Unit CU 4KS31NBU Indoor Unit CS MKS24NKU x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart Gem sea ge 174 gt 146 PETG PEE EEE REL 3 1 0 t D 118 o 0 8 a z 90 0 6 77 8 95 104 25 30 35 40 Outdoor air temperature F C 2 Operating current performance chart xe LEN EE MR m A 3 Operating current ZI Outdoo
4. 2 rel 1 s I gt Me cil VAIO 9 59 TERMINAL PLATE TERMINAL PLATE FERRITE CORE 1 2 3 4 5 112 3 4 5 MAGNETIC COIL 3409 318833 ZH 1 2 3 4 5 1 2 3 4 5 MAGNETIC COIL L LHM D LHM LHM L LHM HOLO3NNOO dc REACTANCE MAGNETIC COIL LHM j J o tc lt E Er lt Li 1 CONNECTOR 1 WHT CONNECTOR CRANKCASE HEATER CONTROLLER HOLSIINH3H L 2P CONNECTOR YOLSINYAHL Ng 13A4 CWWO HOLSIINH3H L MO EXPANSION BOARD 2P CONNECTOR 13A HOLSIINH3H L Ma HOLSIINH3H IL NV TAA 134 HOLSIINH3H L MV DUO HOLSINHAHL HOOGLNO o nyag i ng 18 eo H LIMS 3unssaud FAN MOTOR YOLSINYAHL OVERLOAD RELAY OLR MOTOR 3E El 8 Liw ya x HOLSIINH3H L HOLO3NNOO HOSS3HdNWOOS COMPRESSOR 8FA2 5251 11800 1 62 Outdoor Unit CU 4KS24NBU LINN HOOQNI OL LINN LINN HOOQNI V 8 I I I I I I I I I I I I I I I I I S66S66S66S6666 9 m TERMINAL PLATE TERMINAL PLATE FERRITE CORE l 3409 31
5. FT 22212 EA EE EZE EE ZE 222222222 SS Concrete 22222222222 EE a or equal lt b 159 Ut 76 Wind Back i ANNAN W NUTTY N NM NON AN AN N NW N A z NN NANA WN WAN AN WAWAN A I WW i WAN v A QUY p Ms y NW N Cushion rubber Fig 5e Front Wind Air discharge baffle No air intake baffle required on this side Fig 5f 1 Recommended dimensions of the baffle plates Air Intake Baffle X gO Fig 5g CU 3KS19NBU i 25 3 16 25 32 1 31 32 150 Dimensions Model 10 5 8 10 5 8 25 64 25 32 19 32 25 7 8 19 64 25 64 5 29 32 25 32 25 32 30 29 32 13 25 32 13 25 32 25 64 31 25 32 19 64 25 64 5 29 32 CU 4KS24NBU 25 3 16 25 32 CU 4KS31NBU Model 150 CU 3KS19NBU 22 1 16 23 1 32 13 25 32 5 29 32 19 9 32 1 3 8 2 5 32 18 5 16 2 3 8 3 11 32 31 32 CU 4KS24NBU CU 4KS31NBU Material to be used Metal plate with corrosion protection treatment Plate thickness 0 0394 to 0 0472 1 0 to 1 2 mm 2 Parts required field supply except for screws Air Intake Baffle Item Air Discharge Baffle
6. Package Dimensions inch 40 1 8 x 41 11 32 x 16 21 32 6 Height x Width x Depth mm 1 019 x 1 050 x 423 2 Weight Net lbs kg 174 2 79 0 E Shipping Ibs kg 15 88 0 45 DATA SUBJECT TO CHANGE WITHOUT NOTICE Remarks 1 The values shown in performance section and electrical rating section above are based on the following unit combination For other combination unit please refer to the Unit Combination Tables in this manual Indoor Unit CS MKS9NKU 4units Outdoor Unit CU 4KS31NBU tunit 2 Rating conditions are Cooling Indoor airtemp 80 F DB 67 F WB Outdoor air temp 95 F DB 75 F WB 1 Outdoor Unit CU 4KS31NBU MKS9NK 4 ndoor Unit CS S9NKU x mS 4 Room Multi Outdoor Unit Number of Connectable Indoor Units Number of Operatable Indoor Units 4 208V Single Phase 60Hz Cooling Total Capacity BTU h 28 600 9 800 to 28 600 kW 8 40 2 90 to 8 40 Sensible Capacity BTU 24 200 Latent Capacity BTU 4 400 Voltage Rating Performance Compressor Locked Rotor Amperes 17 0 Fuse or Circuit Breaker Capacity Air Circulation High ft min m3 h 1 942 3 300 o Available Voltage Range 18710 253 12 7 Power Input W 2 560 S Power Factor EER BTU h W 11 2 NO O Outdoor Unit Microprocessor Auto Hi Me Lo DC Twin Rotary Inverter R410A 8 38 3 800 Electric Expansion Valve Control Fan Speeds Compressor Refrigerant Amount charged
7. The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 43 Outdoor Unit CU 4KS31NBU Indoor Unit CS MKS12NKU x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart psig MPaG Low pressure at wide tube service valve Outdoor air temperature F C 2 Operating current performance chart Operating current A Outdoor air temperature F C 3 Indoor discharge air performance chart en ESSE ES eu Esel 7 Indoor discharge air temperature F C Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value in test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 44 Outdoor Unit CU 4KS31NBU Indoor Unit CS MKS18NKU x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart T qum s S 174 8 LL j gt 90 B 146 pp TE 3 1 0 z T
8. o LLL N N Resistance k ohm A 5 14 23 32 41 50 59 68 20 15 10 5 0 5 10 15 20 gt Temperature F Model No Quantity of Sensor Sensor Name of sensor CU 3KS19NBU CU 4KS24NBU CU 4KS31NBU Compressor temp sensor TKS293B 200 e PP IET mamam E so LN 5 160 Ty x 440 COL io s mama 100 nam ms manaa ao lL A MIN mamam A E E 2 T TIT o LL TTT TTT tt T 32 50 68 86 104 122 140 158 176 194 0 10 20 30 40 50 60 70 80 90 Temperature F C 20 3 DIMENSIONAL DATA Outdoor Unit CU 3KS19NBU 11 17 32 23 15 16 5 11 32 35 7 16 900 2 15 16 21 29 1 8 740 Wide tube service valve dia 3 8 9 52 x 3 Narrow tube service valve dia 1 4 6 35 x 3 5 29 32 2 27 32 2 3 4 2 15 16 2 3 4 4 7 16 Unit inch mm 852 0 0010 11500 0 5 11 32 23 15 16 CU 4KS24NBU Outdoor Unit gt g g y 9 8 zy gt 5 j Wem nO Ae 9 LO OQ qj f e 10 or 5 des O gt gt Fea y 5 aio 3 Y Y
9. 1 Low pressure performance chart ES Ye Bind psig MPaG Low pressure at wide tube service valve Outdoor air temperature F C 2 Operating current performance chart Operating current A Outdoor air temperature F C 3 Indoor discharge air performance chart eve 60 8 16 ndoot ME air e C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6t 7 5m If the tubing length is different the performance chart will vary 27 Outdoor Unit CU 3KS19NBU Indoor Unit CS MKS9NKU x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart KAJEN E NH em LN psig MPaG b Low pressure at wide tube service valve Outdoor air temperature F C 2 Operating current EN chart Dum 2 eo Operating current A Outdoor air temperature F C 3 Indoor discharge air performance chart Kiem Dum 2 Dom O 68 0 20 uo EEE 64 4 18 S 8 60 8 16 3 5
10. lt Cooling Capacity gt RATING CAPACITY 18 300 BTU h AIR FLOW RATE 706 CFM INDOOR OUTDOOR ENT TEMP F C AMBIENT TEMP F WB 65 75 85 95 105 115 18 3 23 9 29 4 35 0 40 6 46 1 TG 19 260 18 620 17 930 17 410 16 590 15 710 12 430 12 160 11 890 11 610 11 340 10 930 21 830 21 170 20 440 20 010 19 120 18 040 6 540 6 400 6 120 5 990 5 710 5 440 TC Total Cooling Capacity BTU h SHC Sensible Heat Capacity BTU h NOTE 1 Rating conditions Indoor Unit Entering Air Temp 80 F 26 7 C DB 67 F 19 4 C WB Outdoor Ambient Temp 95 F 35 C DB 2 Above data does not take Freeze Prevention Protection during cooling operation into account For this reason the value may vary from the actual cooling characteristics 3 Above data represents the value when the operation frequency of a compressor is fixed 51 Outdoor Unit CU 4KS24NBU Indoor Unit CS MKS9NKU x Power Supply 230V Single Phase 60Hz Cooling Capacity RATING CAPACITY 25 400 BTU h AIR FLOW RATE 777 CFM INDOOR OUTDOOR ENT TEMP F C AMBIENT TEMP F C WB 65 75 85 95 105 115 18 3 23 9 29 4 85 0 40 6 46 1 TG 27 810 780 15 220 20 0 9 300 29 440 28 560 27 580 26 850 20 020 14 760 9 000 8 690 8 240 8 090 5 830 4 320 TC Total Cooling Capacity BTU h SHC Sensible Heat Capacity BTU h NOTE 1 Rating conditions Indoor Uni
11. Low pressure at wide tube service valve ae Outdoor air temperature F C 2 Operating current performance chart Operating current A Outdoor air temperature F C 3 Indoor discharge air performance chart STN E HHH O 64 4 18 Oo T D Indoor discharge air temperature F Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 32 Outdoor Unit CU 3KS19NBU Indoor Unit CS KS18NB4UW x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart tm PE psig MPaG Low pressure at wide tube service valve 95 104 25 30 35 40 Outdoor air temperature F C 2 Operating current performance chart Ke Dn gt Operating current A Outdoor air temperature F C 3 Indoor discharge air performance chart 57 2 14 or air temp 86 F
12. 13 810 at 15860 19 430 16 000 16 140 16 140 19 290 19 440 19 840 20 390 20 550 6 120 19440 8460 8590 8590 10 10 19 440 10 790 10 930 10 930_ _ 12980 19440 13 120 13 260 13 260 TC Total Cooling Capacity BTU h SHC Sensible Heat Capacity BTU h NOTE 1 Above data does not take Freeze Prevention Protection during cooling operation into account For this reason the value may vary from the actual cooling characteristics 2 Above data represents the value when the operation frequency of a compressor is fixed 57 Outdoor Unit CU 4KS24NBU Indoor Unit CS MKS9NKU x Power Supply 230V Single Phase 60Hz lt Cooling Capacity Low Ambient gt RATING CAPACITY 25 400 BTU h AIR FLOW RATE 777 CFM INDOOR OUTDOOR ENT TEMP F C AMBIENT TEMP F 15 9 4 25 420 21 970 22 120 22 120 A 24840 25420 24 840 24 840 24840 25470 25420 25470 25670 25 610 _ At 25 470 25420 25470 25670 560 835 25 500 18 500 18650 18650 a _ 21220 25590 21 370 21520 21 520 a 23930 25590 23 930 24 080 24 230 at 25540 25590 25780 26 160 26210 14730 25550 15030 15 180 15 330 ___ 17600 25550 17 750 18 050 18 050 y 20160 25550 20460 20 610 20 760 At 22 880 2555 23 180 23 330 23 480 _ 24 930 25
13. 30 35 40 Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value in test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 47 Outdoor Unit CU 4KS31NBU Indoor Unit CS MKS12NBAU x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart SE a Qe Dmm ti EE 2 174 NTT ee LLL 2 146 3 1 0 s 2 118 0 8 z S 90 0 6 77 86 95 104 25 30 35 40 Outdoor air temperature F C 2 Operating current performance chart rig 4 Z N Operating current A Outdoor air temperature F C 3 Indoor discharge air performance chart cuco Ee ST TE qd Emp 64 4 18 60 8 16 57 2 14 53 6 12 gt Indoor discharge air temperature F C 42 8 6 Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary d
14. 6 17 2 800 Electric Expansion Valve Control Fan Speeds Compressor Refrigerant Amount charged at shipment Ibs g Refrigerant Control Operation Sound High Cool Q r gt Refrigerant Tubing Connections Flare Type Max allowable tubing length per unit ft m 82 25 Refrigerant Narrow tube inch mm 1 4 6 35 x 4 Tube Diameter Wide tube inch mm 3 8 9 52 x 3 1 2 12 7 x 1 5 Outdoor Unit Unit Dimensions inch 29 1 8 x 35 7 16 x 12 19 32 Height x Width x Depth mm 740 x 900 x 320 Package Dimensions inch 34 3 16 x 41 11 32 x 16 21 32 6 Height x Width x Depth mm 868 x 1 050 x 423 2 Weight Net lbs kg 138 9 63 0 E Shipping Ibs kg 13 41 0 38 DATA SUBJECT TO CHANGE WITHOUT NOTICE Remarks 1 The values shown in performance section and electrical rating section above are based on the following unit combination For other combination unit please refer to the Unit Combination Tables in this manual Indoor Unit CS MKS9NKU Outdoor Unit CU AKS24NBU tunit 2 Rating conditions are Cooling Indoor air temp 80 F DB 67 F WB Outdoor air temp 95 F DB 75 F WB 1 N Outdoor Unit CU 4KS24NBU MKS9NK ndoor Unit CS SONKU x 3 c 208V gt 4 Room Multi Outdoor Unit Number of Connectable Indoor Units Number of Operatable Indoor Units 4 208V Single Phase 60Hz Cooling Total Capacity BTU h 24 400 9 800 to 24 400 kW 7 20 2 90 to 7 20 Sensible Capa
15. CAUTION outlet at least 1 5 m away from the unit In Moist or Uneven Locations Use a raised concrete pad or concrete blocks to provide a solid level foundation for the outdoor unit This prevents water damage and abnormal vibration In an Area with High Winds Securely anchor the outdoor unit down with bolts and a metal frame Provide a suitable air baffle a Snowy Area Install the outdoor unit on a raised platform that is higher than drifting snow Provide snow vents When Connecting Refrigerant Tubing When performing piping work do not mix air except for speci fied refrigerant R410A in refrigeration cycle It causes capacity down and risk of explosion and injury due to high tension inside the refrige rant cycle Refrigerant gas leakage may cause fire Do not add or replace refrigerant other than specified type It may cause product damage burst and injury etc Ventilate the room well in the event that refrigerant gas leaks during the installation Be careful not to allow contact of the refrigerant gas with a flame as this will cause the generation of poisonous gas Use the flare method for connecting tubing Apply refrigerant lubricant to the matching surfaces of the flare and union tubes before connecting them then tighten the nut with a torque wrench for a leak free connection Check carefully for leaks before starting the test run Do not leak refrigerant while piping w
16. 14 not provided a the outdoor unit N Label C Terminal board Be sure to perform grounding e Be sure to apply the provided labels to both e Attach a ground wire to either the ends of the inter unit cables to prevent mis outdoor unit or indoor unit wiring The units will not function if the wiring e f there is a grounding terminal connections are incorrect inside the room use the grounding AWG American Wire Gauge screw inside the indoor unit Fig 31 Use a dedicated air conditioner circuit for power To make connections to the outdoor unit remove the inspection panel and tubing panel Do not bring the inter unit cables or power cable into contact with tubing or service valves Use outdoor unit cable fasteners and fasten the inter unit cables at the location where the cables are double sheathed Arrange the wiring so that the inter unit cables are contained in the inspection panel and tubing panel as shown in Fig 31 25 Regulations on wire size differ from locality to locality For field wiring requirements please refer to your local electri cal codes Make sure that the installation fully complies with all local and national regulations 1 Remove access panel Fig 32 2 Connect the inter unit and power supply line accord ing to the drawing on the panel side 3 Be sure to size each wire allowing approx 4 10 cm longer than the required length for
17. 35 40 Outdoor air temperature F C NOTE This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value in test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 42 Outdoor Unit CU 4KS31NBU Indoor Unit CS MKS9NKU x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart psig MPaG Low pressure at wide tube service valve Outdoor air temperature F C 2 Operating current performance chart Operating current A Outdoor air temperature F C 3 Indoor discharge air performance chart LLL L Ci gt TEE Indoor discharge air temperature F C Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked
18. 99 Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 33 5 1 2 Temperature Charts CU 4KS24NBU Outdoor Unit CU 4KS24NBU Indoor Unit CS MKS7NKU x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart Tes psig MPaG Low pressure at wide tube service valve Outdoor air temperature F C 2 Operating current performance chart Operating current A Outdoor air temperature F C 3 Indoor discharge air performance chart aa air e C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The pe
19. DB 2 Above data does not take Freeze Prevention Protection during cooling operation into account For this reason the value may vary from the actual cooling characteristics 3 Above data represents the value when the operation frequency of a compressor is fixed 55 5 3 Cooling Capacity Low Ambient Outdoor Unit CU 3KS19NBU Indoor Unit CS MKS9NKU x Power Supply 230V Single Phase 60Hz lt Cooling Capacity Low Ambient gt RATING CAPACITY 18 800 BTU h AIR FLOW RATE 777 CFM INDOOR OUTDOOR ENT FCC AMBIENT TEMP F 15 9 4 E m 19 090 18 950 18 050 18950 f 19220 19090 19 080 19 160 19 010 19 20 19090 19 080 19 160 19 010 at 19220 19 090 19 080 19 160 19 010 19 620 19 540 19 610 19 780 19 680 x 19540 15 780 15940 15 780_ a 18650 19 540 18650 18 650 18 650 A 19 20 19540 19610 19 780 19 680_ at 19 620 19 540 19 610 19 780 19 680 19890 12 620 12 770 12 770 15330 19890 15480 15 480 15 480_ 18 050 19890 18050 18 200 18 200 _ 19 910 19 890 20 060 20 340 20320 Sonso 20120 9300 9450 9450 12010 20 20 12 160 12 310 12 310 14580 20120 14 730 14 880 14 880_ At 17290 20120 17440 17 600 17 600 aseo 20 180 8 840 9000 9 150 14 410 2018
20. Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 29 Outdoor Unit CU 3KS19NBU Indoor Unit CS MKS18NKU x 1 ll Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart psig MPaG Low pressure at wide tube service valve Outdoor air temperature F C 2 W current chart Operating current A V A 1 ALA A 86 95 104 30 35 40 Outdoor air temperature F C TON oN 3 Indoor discharge air performance chart Ce in Po Ses tt tt 5 64 18 57 2 14 gra 2 Mmm s s 6 12 S pnm T 50 0 10 46 4 8 77 86 95 104 25 30 35 40 Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6
21. Page A SAFETY PRECAUTIONS 2 TABLE OF CONTENTS eese pud seg et a oett oh ded 4 B APPLICABLE INDOOR UNITS 6 x OPEBHATINGTANGE 2 aed eae epe see Melee oce E ee 7 SPECIFICATIONS io 2 A 8 2 2 Major Component Specifications a ra ar nnne nnne nnn nnns 17 2 3 Other Component Specifications escasa 20 DIMENSIONAL DATA A 21 REFRIGERANT FLOW DIAGRAM Ale Remgerami Flow Diagrami dono 24 PERFORMANCE DATA 5 1 Temperature Charts comio oca 27 5 2 Cooling iones 50 5 3 Cooling Capacity LOW Ambient a 56 ELECTRICAL DATA 62 6 1 Electric Wiring Diagrams FUNCTIONS Q ll rado api 65 Fallo Explanation of FUNCUON ado 69 7 2 Protective Functions TROUBLESHOOTING BEFORE CALLING FOR SERVICE 71 8 1 Precautions before Performing Inspection or 72 8 2 Trouble Diagnosis by Error Monitop Lamps 73 8 3 Checking the O
22. The knob of the manifold valve must always be kept closed e Use a hex wrench of a type to which force can be easily applied 4 With the Lo knob of the manifold valve open and high pressure valve closed completely run the vacuum pump Run the pump until the pressure is 101 kPa 76 cmHg The operation time for the vacuum pump varies with tubing length and the capacity of the pump The following table shows the amount of time required for evacuation Table 5 Required time for evacuation when capacity of 100 liter h vacuum pump is used The required time in Table 5 is calculated based on the assumption that the ideal or target vacuum condition is around 10 mmHg abs 20 min or more 5 With the vacuum pump still running close the Lo knob of the manifold valve Then stop the vacuum pump Fully close the low pressure valve and stop the vacuum pump Wait 1 2 minutes and check that the manifold gauge pointer does not return If it does return find and repair the leak then apply the vacuum again 6 With a hex wrench turn the valve stem on the narrow tube service valve counter clockwise by 90 degrees 1 4 turn for 10 seconds and then turn the stem clockwise to close it again Be sure to completely insert the hex EAT wrench before attempting to turn the valve 7 With a standard screwdriver turn the wide tube service valve stem counterclockwise to fully open
23. employ the flaring method to connect refrigerant tubes which run between indoor and outdoor units In this method the copper tubes are flared at each end and connected with flare nuts 3 3 Flaring Procedure with a Flare Tool 1 Cut the copper tube to the required length with a tube cutter It is recommended to cut approx 12 to 20 30 to 50 cm longer than the tubing length you estimate 2 Remove burrs at the end of the copper tube with a tube reamer or file This process is important and should be done carefully to make a good flare Fig 8 16 Before Deburring Fig 8 When reaming hold the tube end downward and be sure that no copper scraps fall into the tube Fig 9 3 Remove the flare nut from the unit and be sure to mount it on the copper tube 4 Make a flare at the end of copper tube with a flare tool Figs 10 and 11 Use RIDGID or equivalent A good flare should have the following characteristics inside surface is glossy and smooth edge is smooth tapered sides are of uniform length 3 4 Caution before Connecting Tubes Tightly a Be sure to apply a sealing cap or water proof tape to prevent dust or water from getting into the tubes before they are used b Be sure to apply refrigerant lubricant to the matching surfaces of the flare and union before connecting them together This is effective for reducing gas leaks Fig 12 For proper conne
24. 240 25 840 26 690 27 040 9 000 isso 25 240 11 260 11 560 11 710 _ _ 13 670 25 240 13970 14 280 14 430 a 16 3990 25 240 16690 16 990 17 140 ___ 194100 25240 19 410 19 710 19 860 Tf 0050 24 680 10 500 10 810 10 960 12620 24 680 13 070 13 520 13 670 15 330 24 680 15 780 16 090 16 390 TC Total Cooling Capacity BTU h SHC Sensible Heat Capacity BTU h NOTE 1 Above data does not take Freeze Prevention Protection during cooling operation into account For this reason the value may vary from the actual cooling characteristics 2 Above data represents the value when the operation frequency of a compressor is fixed 58 Outdoor Unit CU 4KS24NBU Indoor Unit CS KS18NB4UW CS MKS12NB4U CS MKS12NB4U Power Supply 230V Single Phase 60Hz lt Cooling Capacity Low Ambient gt RATING CAPACITY 24 800 INDOOR ENT TEMP F C BTU h AIR FLOW RATE 812 CFM OUTDOOR AMBIENT TEMP F 15 9 4 0 ES tn AUN A 890 830 24880 25 090 25 020 24830 22 200 22 200 22 200 ay 24890 24 830 24 880 25090 25 020 24890 24 830 24 880 25 090 25 020 24 890 24 830 24 880 25 090 25 020 _ 25050 18 570 18 730 18 890 21410 25050 21570 21 730 21 730_ 24 250 25050 24250 24 410 24 570 25 020 25050 25250 2562
25. 28460 23460 26880 31 130 27 080 27280 27 280 30 500 31 130 30 700 30700 30 700 _ 31 40 31 130 31 320 31 720 31730 Lp 31 150 31 270 31 660 32 300 32 450 31 270 18 830 19 030 19 030 a 22 250 31270 22450 22 860 22 860_ 85 70 31270 26 080 26280 26 480 _ 29 90 31 270 29700 29 900 29 900 _ s 30 850 31 120 31 750 32 680 33 020 x 1860 1120 14010 14410 14410 LL 17 80 17690 18090 18 230 1 120 21250 21 660 21650 oro 25270 25270 13200 13 600 13 600 16 220 30670 16 620 17020 17 220 19840 30 670 20240 20 640 20 840 _ TC Total Cooling Capacity BTU h SHC Sensible Heat Capacity BTU h NOTE 1 Above data does not take Freeze Prevention Protection during cooling operation into account For this reason the value may vary from the actual cooling characteristics 2 Above data represents the value when the operation frequency of a compressor is fixed 60 Outdoor Unit CU 4KS31NBU Indoor Unit CS MKS9NB4U x 4 Power Supply 230V Single Phase 60Hz lt Cooling Capacity Low Ambient gt RATING CAPACITY 28 600 BTU h AIR FLOW RATE 883 CFM INDOOR OUTDOOR ENT TEMP F C AMBIENT TEMP F 15 9 4 x 25 28790 25810 25 980 25
26. 980 a 28s90 28 790 28 810 28 990 28 870 a 28890 28 790 28 810 28 990 28 870 _ 28ss0 28 790 28810 28 990 28 870 29 150 21 700 21 870 21 870 _ ___ 25130 29 150 25 130 25 300 25 300 28390 29 150 28 390 28 560 28 560 _ 29170 29150 29320 29 660 29 650 _ NNNM 29 210 29 310 29 650 30 210 30 330 29310 17 580 17 760 17 930 0 40 29 310 21 010 21 180 21 360 24100 29 310 24 270 24 440 24610 27 360 29310 27 530 27 870 27 870 29 200 13 130 13 470 19 640 16 80 29 200 16 560 16 900 17 070_ 19 40 29200 19 810 20 160 20 330 Aa 22 900 29200 23240 23 410 23 580 TT isso 28820 12440 12 780 12 960 15 60 28 820 15 700 16 040 16 210 at 18610 28820 18 960 19 300 19 470 TC Total Cooling Capacity BTU h SHC Sensible Heat Capacity BTU h NOTE 1 Above data does not take Freeze Prevention Protection during cooling operation into account For this reason the value may vary from the actual cooling characteristics 2 Above data represents the value when the operation frequency of a compressor is fixed 61 6 ELECTRICAL DATA 6 1 Electric Wiring Diagrams Outdoor Unit CU 3KS19NBU AlddNs LINN HOOQNI OL LINA LINA 8 6 I I I I I HOOQNI 8
27. BTU 2 800 Voltage Rating Performance Compressor Locked Rotor Amperes 13 0 Fuse or Circuit Breaker Capacity Air Circulation High ft min m h 1 707 2 900 o Available Voltage Range 18710 253 E Power Input W 1 500 5 Power Factor EER BTU h W 12 5 LLI Outdoor Unit Microprocessor Auto Hi Me Lo DC Twin Rotary Inverter R410A 6 17 2 800 Electric Expansion Valve Control Fan Speeds Compressor Refrigerant Amount charged at shipment Ibs g Refrigerant Control Operation Sound High Cool o UD N O O O1 N Refrigerant Tubing Connections Flare Type Max allowable tubing length per unit ft m 82 25 Refrigerant Narrow tube inch mm 1 4 6 35 x 3 Tube Diameter Wide tube inch mm 3 8 9 52 x 3 5 Outdoor Unit Unit Dimensions inch 29 1 8 x 35 7 16 x 12 19 32 Height x Width x Depth mm 740 x 900 x 320 Package Dimensions inch 34 3 16 x 41 11 32 x 16 21 32 6 Height x Width x Depth mm 868 x 1 050 x 423 2 Weight Net lbs kg 138 9 63 0 E Shipping Ibs kg a 13 41 0 38 DATA SUBJECT TO CHANGE WITHOUT NOTICE Remarks 1 The values shown in performance section and electrical rating section above are based on the following unit combination For other combination unit please refer to the Unit Combination Tables in this manual Indoor Unit CS MKS9NKU Outdoor Unit CU 3KS19NBU tunit 2 Rating conditions are Coolin
28. CS MKS9NKU x 2 Duct Less Type Rated 230V gt Cooling 9 Total Capacity BTU h 17 000 6 800 to 18 800 5 5 9 Running Amperes A 6 Power Factor O 8 9 DC Twin Rotary Inverter 82 25 Refrigerant Narrow tube inch mm 1 4 6 35 x 3 Tube Diameter Wide tube inch mm Unit Dimensions inch 29 1 8 x 35 7 16 x 12 19 32 x Height x Width x Depth mm 740 x 900 x 320 Package Dimensions inch 34 3 16 x 41 11 32 x 16 21 32 6 Height x Width x Depth mm 868 x 1 050 x 423 2 Weight Net Ibs kg 138 9 63 0 E Shipping Ibs kg A Shipping Volume cu ft m 13 41 0 38 DATA SUBJECT TO CHANGE WITHOUT NOTICE Remarks 1 The values shown in performance section and electrical rating section above are based on the following unit combination For other combination unit please refer to the Unit Combination Tables in this manual Indoor Unit CS MKS9NKU units Outdoor Unit CU 3KS19NBU tunit The combination indoor unit is AHRI 210 240 2 Rating conditions are Cooling Indoor airtemp 80 F DB 67 F WB Outdoor air temp 95 F DB 75 F WB Outdoor Unit CU 3KS19NBU MKS9NK Indoor Unit CS SONKU x 3 lt 230V gt 3 Room Multi Outdoor Unit Number of Connectable Indoor Units Number of Operatable Indoor Units 3 230V Single Phase 60Hz Cooling Total Capacity BTU h 18 800 9 800 to 18 800 kW 5 50 2 90 to 5 50 Sensible Capacity BTU 16 000 Latent Capacity
29. Drain pipe and insulation Refrigerant tubing and vinyl tie not supplied and insulation supplied not supplied Drain hose and nose Insulation tape Supplied supplied P d Vinyl tie supplied Flare insulation Supplied The procedure used for installing the insulation for both wide and narrow tubes are the same Fig 17c Never grasp the drain or refrigerant connecting out lets when moving the unit 3 7 Taping the Tubes After a tube has been insulated CAUTION never try to bend it into a narrow curve as this may cause the tube to break or crack 1 At this time the 2 refrigerant tubes and electrical wire if local codes permit should be taped together with armoring tape The drain hose may also be included and taped together as 1 bundle with the tubing 2 Wrap the armoring tape from the bottom of the outdoor unit to the top of the tubing where it enters the wall As you wrap the tubing overlap half of each previous tape turn Fig 18 3 Clamp the tubing bundle to wall using 1 clamp approx every 47 120 cm Do not wind the armoring tape too tightly since this will decrease the heat insulation effect Also be sure the con densation drain hose splits away from the bundle and drips clear of the unit and the tubing 3 8 Finishing the Installation After finishing insulating and taping over the tubing use sealing putty to seal off the hole in the wa
30. INSTALLATION SITE SELECTION 5 2 1 Indoor Unit 2 2 Connecting Indoor Units 2 3 Outdoor Unit 2 4 Baffle Plate for the Outdoor Unit 2 5 Outer Dimensions of Outdoor Unit 2 6 Diagram of Outdoor Unit Installation INSTALLATION PROCESS 16 3 1 Embedding the Tubing and Wiring 3 2 Use of the Flaring Method 3 3 Flaring Procedure with a Flare Tool 3 4 Caution before Connecting Tubes Tightly 3 5 Tubing Connections 3 6 Insulation of Refrigerant Tubing 3 7 Taping the Tubes 3 8 Finishing the Installation AIR 19 Air Purging with a Vacuum Pump for Test Run Pump Down WIRING INSTRUCTIONS 22 5 1 General Precautions on Wiring 5 2 Recommended Wire Length and Diameter 5 3 Wiring System Diagram 5 4 How to Connect Wiring to the Terminal 5 5 Wiring Instructions for the Outdoor Unit TEST RUN 26 CONNECTING A HOME AUTOMATION DEVICE i uuu 27 INSTALLATION CHECK SHEET 27 CV6233187761 IMPORTANT Please Read Before Starting This air conditioning system meets strict safety and operating standards As the installer or service person it is an important part of your job to install or service the system so it operates safely and efficiently For safe installation and trouble free op
31. Outdoor Unit CU 4KS31NBU unit The combination indoor unit is AHRI 210 240 2 Rating conditions are Cooling Indoor air temp 80 F DB 67 F WB Outdoor air temp 95 F DB 75 F WB J Outdoor Unit CU 4KS31NBU MKS9NK 4 Indoor Unit CS S9NKU x M 4 Room Multi Outdoor Unit Number of Connectable Indoor Units Number of Operatable Indoor Units 4 230V Single Phase 60Hz Cooling Total Capacity BTU h 30 600 9 800 to 30 600 kW 9 00 2 90 to 9 00 Sensible Capacity BTU 25 800 Latent Capacity BTU 4 800 Voltage Rating Performance Compressor Locked Rotor Amperes 17 0 Fuse or Circuit Breaker Capacity Air Circulation High ft min m3 h 1 942 3 300 Available Vottage Range 187 10 253 E 123 ee Power Input W 2 800 5 Power Factor EER BTU h W 10 9 3 TT NO O Outdoor Unit Microprocessor Auto Hi Me Lo DC Twin Rotary Inverter R410A 8 38 3 800 Electric Expansion Valve Control Fan Speeds Compressor Refrigerant Amount charged at shipment Ibs 9 Refrigerant Control Operation Sound High Cool Q r gt Refrigerant Tubing Connections Flare Type Max allowable tubing length per unit ft m 100 30 5 Refrigerant Narrow tube inch mm 1 4 6 35 x 4 Tube Diameter Wide tube inch mm 3 8 9 52 x 2 1 2 12 7 x 2 Outdoor Unit Unit Dimensions inch 35 1 32 x 35 7 16 x 12 19 32 _ Height x Width x Depth mm 890 x 900 x 320
32. X 9L Y i O QA v o v E 2 OvZ 8 L 62 7 16 900 35 mm 0 0010 20500 0 Unit inch 852 22 CU 4KS31NBU Outdoor Unit 5 11 32 23 15 16 eg Li vt Wide tube service valve dia 1 2 12 70 x 2 Narrow tube service valve 2 N o x 5 X iD cO O gt 6 c S jo 3 068 Z L S v o v c 8 2 v e e v e c 91 L p c 6c S Unit inch mm 852 0 0010 20600 0 23 4 REFRIGERANT FLOW DIAGRAM 4 1 Refrigerant Flow Diagram Outdoor Unit CU 3KS19NBU Indoor unit Outdoor unit n AA Service valve on wide tube Wide tube CW O D 3 8 Z lt Sub Main S accumulator accumulator ODS 8 28 3 Header High pressure switch Q Electric expansion 5 Service valve on valve j j narrow tube Narrow tube CN _ BN pu ED AN y SENA px DX Strainer Header lt U LL LLL Cooling cycle Insulation of Refrigerant Tubing IMPORTANT Because capillary tubing is used in the outdoor unit both the wide and narrow tubes of this air conditioner become cold To prevent
33. air temperature F C 2 Operating current performance chart Ke Dn gt Operating current A Outdoor air temperature F C 3 Indoor discharge air performance chart 57 2 14 or air temp 86 F 99 Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value in test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 41 5 1 3 Temperature Charts CU 4KS31NBU Outdoor Unit CU 4KS31NBU Indoor Unit CS MKS7NKU 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230 60Hz 1 Low pressure performance chart psig MPaG 30 C door air temp 6 n Low pressure at wide tube service valve Outdoor air temperature F C 2 Operating current performance chart Operating current A Outdoor air temperature F C 3 Indoor discharge air performance chart sm Dn 64 4 18 Indoor discharge air temperature F C 57 2 14 53 6 12 50 0 10 46 4 8 77 86 95 104 25 30
34. at shipment Ibs 9 Refrigerant Control Operation Sound High Cool Q e 2 Refrigerant Tubing Connections Flare Type Max allowable tubing length per unit ft m 100 30 5 Refrigerant Narrow tube inch mm 1 4 6 35 x 4 Tube Diameter Wide tube inch mm 3 8 9 52 x 2 1 2 12 7 x 2 Outdoor Unit Unit Dimensions inch 35 1 32 x 35 7 16 x 12 19 32 _ Height x Width x Depth mm 890 x 900 x 320 Package Dimensions inch 40 1 8 x 41 11 32 x 16 21 32 6 Height x Width x Depth mm 1 019 x 1 050 x 423 2 Weight Net lbs kg 174 2 79 0 E Shipping Ibs kg 15 88 0 45 DATA SUBJECT TO CHANGE WITHOUT NOTICE Remarks 1 The values shown in performance section and electrical rating section above are based on the following unit combination For other combination unit please refer to the Unit Combination Tables in this manual Indoor Unit CS MKS9NKU 4units Outdoor Unit CU 4KS31NBU tunit 2 Rating conditions are Cooling Indoor airtemp 80 F DB 67 F WB Outdoor air temp 95 F DB 75 F WB 1 o 2 2 Major Component Specifications 2 2 1 Outdoor Unit Outdoor Unit CU 3KS19NBU Control PCB CB CU 3KS19NBU Control Circuit Fuse 250V 25A Compressor DC Twin Rotary Hermetic Compressor Model Nominal Output 5KD240XAB21 1 700W Compressor Oil Amount Pints cc FV50S 1 91 900 Coil Resistance Ambient Temp 68 F 20 C Ohm U V 0 720 V W 0 708 W U 0 726 Safety Devic
35. causes including increasing cooling loads or decreases in power voltage In these cases the operating frequency is automatically reduced or operation is stopped in order to control the operating current so that it is 20 A or less As a result d Power breakers and fuses will not be tripped Operation can continue during this period with somewhat reduced cooling capacity Operation at normal capacity is restored when the cause of the current rise is eliminated Description of function Example of operation for cooling 5 20 Power Point C 1 Point 16 6 Point 4 tt tt 1 frequency Frequency Frequency Stops operation Approx 3 minutes Operates at the target frequency at Point and below Stops increases to the frequency between Points and e Reduces the frequency by 1 Hz per 0 5 seconds when Point is exceeded e Stops operation and restarts it appoximately 3 minutes later if Point is exceeded May operate when sudden voltage fluctuations occur gt Indicates trouble 1 Automatic frequency control The operating frequency is reduced automatically or operation is stopped in order to control the operating current so that it is at or below the values shown in the table below Point C peak cut trip Point B Hz reduction Point A Hz increase prohibit 69 2 Current control The operating frequency upper limits shown in
36. discharge air temperature F C Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 37 Outdoor Unit CU AKS24NBU Indoor Unit CS MKS24NKU x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure chart psig MPaG Low pressure at wide tube service valve 104 25 30 t 5 40 Outdoor air temperature F C 2 current performance chart Operating current A Outdoor air temperature F C 3 Indoor discharge air performance chart 1 1 N sa 68 020 N A 5 64 4 18 e 60 8 16 57 2 14 S 53 6 12 a 5 50 0 10 E 8 i 46 4 8 T 77 86 95 104 25 30 35 40 Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check
37. each performance value in test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 38 Outdoor Unit CU AKS24NBU Indoor Unit CS MKS9NBAU x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart CS EN E psig MPaG 5 Low pressure at wide tube service valve me air temperature F C 2 Operating current performance chart 6 L Omm mm Operating current T air m C 3 Indoor discharge air performance chart Indoor discharge air temperature F al D 3 53 6 12 50 0 10 46 4 8 77 86 95 104 25 30 35 40 Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value in test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is differen
38. heat loss and wet floors due to dripping of condensation both tubes must be well insulated with a Thickness Thickness proper insulation material The thickness of the insulation Min 5 16 8 mm Min 5 16 8 should be a min 5 16 8 mm After a tube has been insulated dL Wide tube never try to bend it into a narrow curve because it can cause the tube to break or crack CAUTION 24 Outdoor Unit CU 4KS24NBU Indoor unit Outdoor unit po eee TT eee Service valve on wide tube Wide tube O D 3 8 Header x Electric Service valve on uo narrow tube vato Narrow tube DN _ ES x i i Wasa D a BN m O D 1 4 gt lt CED a AN T O D 1 4 2S e pes Sub x Strainer Header Main accumulator accumulator High pressure Insulation of Refrigerant Tubing IMPORTANT Because capillary tubing is used in the outdoor unit both the wide and narrow tubes of this air conditioner become cold To prevent heat loss and wet floors due to dripping of condensation both tubes must be well insulated with a proper insulation material The thickness of the insulation should be a min 5 16 8 mm After a tube has been insulated never try to bend it into a narrow CAUTION curve because it can cause the tube to break or crack 25 Thickness Min 5 16 8 mm Wide tube Compressor Heat exchanger lt V Co
39. nature of the trouble O ON X OFF Error Monitor Lamp Lo x 0 x Yomo x X X SmerereehpbeS marovo o o X X seortoeran pe c varo U U X X O X SmererbeehbeDWerwio o x o x O X x O X sensrtoeran pe waens __ X sensor tran ip quie e _ X X X O T sensoriortranen poe D wasu x x O x O O MWmenoempowerbmidy _ x O ewemeerepowdenndon _ o o O ero Deut o or message on bor LED 72 8 3 Checking the Outdoor System 8 3 1 Checking the outdoor unit O Work procedure Check items unit operation e Apply 220 V AC between terminals L1 and L2 on the The LED red on the control board must illuminate outdoor unit terminal plate e Short circuit the T RUN terminal to the COM terminal The compressor and fan motor must turn ON of TEST T RUN terminals They turn ON about 70 seconds later after the power is turned ON Men If the above check items are okay but the outdoor unit does not operate there may be a faulty connection between the indoor unit and the outdoor unit 73 8 4 Trouble Diagnosis of Each Part 8 4 1 Problems of Each Part and Inspection Points For details about the inspection points refer to the Inspection Points for Each Part Indoor unit Outdoor unit Problems No of Inspection Points for Each
40. part Inspection points Indoor controller control unit Indoor fan motor Room temperature sensor Heat exchanger temperature sensor Inter unit cable Switch circuit board Outdoor control circuit board The compressor stops on occasion The electric expansion valve does Operation lamp does not illuminate not operate The compressor speed does not The compressor only does not increase Outdoor unit does not operate operate _ Q O O o 5 _ o o performance is inadequate Operation lamp blinking Indoor fan dose not turn Outdoor fan dose not turn Does not cool or cooling Indoor unit e Je sensor A fel 1 fof fel T LLL eel Branch tubing temperature sensor Outdoor unit 74 Indoor unit Outdoor unit Problems No of Inspection Points for Each part Inspection points peration lamp blinking peration lamp does not illuminate utdoor unit does not operate he compressor stops on occasion ndoor fan dose not turn The electric expansion valve does The compressor speed does not not operate The compressor only does not increase operate _ Q O c o O c 2 _ o o c performance is inadequate Outdoor fan dose not turn Does not cool or cooling O O O F 8 4 2 Inspection Points for Each Part 1 Outdoor control cir
41. temporarily cover the ends of the tubing with caps or tape prior to installation Never use 0 0276 0 7 mm thick copper tubing or tubing which is less than 0 0315 0 8 mm in thickness since air conditioners with R410A are subject to higher pressure than those using R22 and R407C No addition of compressor oil for R410A No additional charge of compressor oil is permitted No use of refrigerant other than R410A Never use a refrigerant other than R410A If refrigerant R410A is exposed to fire Through welding etc toxic gas may be released when R410A refrigerant is exposed to fire Therefore be sure to provide ample ventilation during installation work e Caution in case of R410A leak Check for possible leak points with the special leak detector for R410A If a leak occurs inside the room immediately provide thorough ventilation 80 9 3 Tools Specifically for R410A For servicing use the following tools for R410A Gauge manifold Charging hose Gas leak detector Refrigerant cylinder Charging cylinder Refrigerant recovery unit Tools specifically for R410A Vacuum pump with anti reverse flow 1 Solenoid valve installed type which prevents oil from flowing back into the unit when the power is off is recommended Vacuum pump 2 can be used if the following adapter is attached Vacuum pump adapter reverse flow prevention adapter 3 Solenoid valve installed adapter attached to a conventional v
42. the valve 8 Turn the narrow tube service valve stem counter clockwise to fully open the valve 9 Loosen the vacuum hose connected to the wide tube service port slightly to release the pressure Then remove the hose 10 Leak test all joints at the tubing both indoor and outdoors with liquid soap Bubbles indicate a leak Be sure to wipe off the soap with a clean cloth CAUTION If a CFC gas detector is used use a special detector for HFC refrigerant such as R410A and R134a 20 11 Replace the flare nut on the wide tube service port and fasten the flare nut securely with an adjustable wrench or box wrench Next mount the valve cap and tighten it with a torque wrench the cap needs to be tightened with the torque of 180 lbs in 200 kgf cm This process is very important to prevent gas from leaking from the system 12 Test run the air conditioner See page 26 14 If there is no leakage stop the air conditioner 15 Wipe off the soap on the tubing This completes air purging with a vacuum pump and the air conditioner is ready for actual operation m Pump Down 2 13 While the air conditioner is running apply liquid soap to check for any gas leaks around the service valves or caps 4 In order to protect the earth s environment be sure to perform pump down to recover refrigerant gas without releasing it into the atmosphere When relocating or disposing of the air conditioner request this ser
43. 0 11560 11 710 11 710 at 14130 20180 14280 14 430 14 430 TC Total Cooling Capacity BTU h SHC Sensible Heat Capacity BTU h NOTE 1 Above data does not take Freeze Prevention Protection during cooling operation into account For this reason the value may vary from the actual cooling characteristics 2 Above data represents the value when the operation frequency of a compressor is fixed 56 Outdoor Unit CU 3KS19NBU Indoor Unit CS MKS12NB4U x 3 Power Supply 230V Single Phase 60Hz lt Cooling Capacity Low Ambient gt RATING CAPACITY 18 300 BTU h AIR FLOW RATE 706 CFM INDOOR OUTDOOR ENT TEMP AMBIENT TEMP F 15 9 4 m 25 LLL 18 570 17 510 17 510 17 510 _ 18680 18 570 18560 18620 18 490 18680 18 570 18560 18620 18 490 L 18 680 18 570 18 560 18 620 18 490 NNNM 19 020 18 960 19 030 19 180 19 100 18960 14770 14 770 14 770 _ 17100 18960 17 100 17 230 17 230 19 0 18960 19 030 19 180 19 100 1 19020 18960 19 030 19 180 19 100 19260 11 890 12020 12020 1420 19 260 14350 14 350 14 350_ 16 50 19260 16 690 16690 16 690 _ 18 880 19260 19 020 19 020 19 020 9430 9000 9 000 11200 19430 11 340 11 470 11 470 18530 19430 13 670 13 810
44. 0 25 660 14790 25080 15 100 15 260 15420 Lo 17 780 25 080 17940 18 260 18 260 20460 25080 20 780 20 940 21 100 23 300 25 080 23 460 23 780 23 780 24 560 24 850 25 440 26 280 26 600 8 950 nooo 24850 11 320 11 630 11 630 13 40 24 850 14 160 14 470 14 630_ 16680 24 850 16 990 17 310 17 310 L 19 360 24 850 19 680 19 990 20 150 24370 10 530 10 840 11 000 12 90 24370 13 370 13 680 13 840_ Lo 15 730 24370 16 050 16 520 16 680 TC Total Cooling Capacity BTU h SHC Sensible Heat Capacity BTU h NOTE 1 Above data does not take Freeze Prevention Protection during cooling operation into account For this reason the value may vary from the actual cooling characteristics 2 Above data represents the value when the operation frequency of a compressor is fixed 59 Outdoor Unit CU 4KS31NBU Indoor Unit CS MKS9NKU x 4 Power Supply 230V Single Phase 60Hz lt Cooling Capacity Low Ambient gt RATING CAPACITY 30 600 BTU h AIR FLOW RATE 1 036 CFM INDOOR OUTDOOR ENT TEMP F C AMBIENT TEMP F 15 9 4 En Tum 30 760 27 890 27890 27 890 0 870 30 760 30 800 31 010 30 890 30870 30 760 30 800 31 010 30 890 at 30 870 30 760 30 800 31 010 30 890_ 23560 31 130 23 260
45. 4433 B MAGNETIC COIL MAGNETIC COIL SIME 4 LHM SISA HO O3NNOO dz LHM MAGNETIC COIL 4 jw 42 o AC lt AC lt I WHT Dil 1P CONNECTOR 1P WHT CONNECTOR MAGNETIC COIL CONTROLLER CRANKCASE HEATER HOLSIINH3H L NO 2P CONNECTOR HOLSIINH3H L EXPANSION BOARD HOLSIINH3H L MO HOLSIINH3H L NG 2P CONNECTOR HOLSIINH3H L HOLSIINH3H L NV THA TAA HOLSIINH3H L 3A HOLSIINH3HL MV IN DUO HOLSIWHSHL HOOGLNO ET mll 9 e HOLIMS Q dunsS3ud 134 7 1109 3118434 gt eo Nd aay E YOLSINYSAHL HOLO3NNOO d YOSSIANOS OVERLOAD RELAY OLR COMPRESSOR MOTOR 2 5251 11600 1 63 Outdoor Unit CU 4KS31NBU LINN HOOGNI OL LINA LINN LIN LINA HOOGNI HOOQNI I I I I I OSO9O9999996 TERMINAL PLATE TERMINAL PLATE CORE FERRITE 3409 31 8434 gt 1HM 1HM 1HM 1HM LHM HOLO3NNOO dz MAGNETIC COIL MAGNETIC COIL SICOM2 REACTANCE MAGNETIC COI
46. 7 2 14 JAN 53 6 12 50 0 10 46 4 8 77 86 95 104 25 30 35 40 Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 28 Outdoor Unit CU 3KS19NBU Indoor Unit CS MKS12NKU x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart 9o LT Sad 174 N OTE gt o n A BA 2 g g 2 D 146 2 e AA ee 0 9 77 E 104 30 95 35 Outdoor air temperature F C 25 eS 2 2 Operating current performance chart Ke Operating current A Outdoor air temperature F C 3 Indoor discharge air performance chart Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value test run mode
47. L J N 4 A lt CONNECTOR 1P WHT MAGNETIC COIL CONTROLLER CRANKCASE HEATER HOLSIINH3H I NO 2P CONNECTOR HOLSIINH3H L Ng HOLSIINH3H L MO HOLSIINH3H L NG TAA HOLSIINH3H 1s Gi HOLSIINH3H L NV I S TAA h A A N WO 534 HOLSIINH3H L TAA LHM 13 HOLO3NNOO dZ HOLSIINH3H L MV M18 YOLSINYAHL eo Leona E 4 O HOLIMS d a AYNSS3AYd Lema gt YOLSINYAHL EXPANSION BOARD 2P CONNECTOR FAN MOTOR 3118834 gt u LHM LHM x8 2 d YOSSIEANOD OVERLOAD RELAY OLR COMPRESSOR MOTOR 8FA2 5251 11400 1 64 7 FUNCTIONS 7 1 Explanation of Functions Meu The numerical values such as temperature frequency time and current in parentheses are an example of CU 4KS31NBU and the values are different from the other models EN Control conditions Unit operation Explanation INITIAL Breaker is ON Power is supplied to the indoor and outdoor unit control circuits however the unit remains stopped Positioning of the outdoor unit electric expansion valve is performed The ON OFF operation If automatic operation mode ha
48. MKS12NB4U 3 8 9 52mm a CS MKS7NKU CS MKS9NKU CS MKS12NKU M CS 3 8 9 52mm 0 IA 635m CS MKS9NB4U CS MKS12NB4U 3 8 9 52mm A mE CS MKS7NKU CS MKS9NKU CS MKS12NKU n MKS9NB4U CS 3 8 9 52mm Q TA 635m CS S9NB4U CS MKS12NB4U Fig 4e D 3 8 9 52mm gt 1 2 12 70 Locally purchased OF Flare 3 8 9 52mm Union 1 2 12 70mm Indoor unit 1 2 12 70mm Outdoor unit CS MKS18NKU CS KS18NB4UW 1 2 12 70mm 1 4 6 35mm 4 5 70mm CS MKS18NKU CS KS18NB4UW E 3 8 9 52mm 1 4 6 35mm 3 8 9 52mm CS MKS7NKU CS MKS9NKU CS MKS12NKU CS MKS9NBAU CS MKS12NBAU X 3 8 9 52mm 1 4 6 35mm 3 8 9 52mm CS MKS7NKU CS MKS9NKU CS MKS12NKU CS MKS9NB4U CS MKS12NB4U X 3 8 9 52mm 1 4 6 35mm Fig 4f 3 Connecting indoor unit for CU 4KS31NBU A 1 2 12 70mm 3 8 9 52mm Supplied Reducer Flare 1 2 12 70mm Union 3 8 9 52mm Indoor unit 3 8 9 52mm CS MKS7NKU CS MKS9NKU CS MKS12NKU CS MKS9NB4U CS MKS12NB4U 1 2 12 70mm 1 4 6 35mm 3 8 9 52mm CS MKS7NKU CS MKS9NKU CS MKS12NKU MH CS MKS9NB4U CS MKS12NB4U 1 2 12 70mm 1 4 6 35mm IE B CS MKS7NKU CS MKS9NKU CS MKS12NKU TAG EE CS MKS9NB4U CS MKS12NB4U als mE CS MKS7NKU CS MKS9NKU CS MKS12NKU NINE CS MKS9NB4U CS MKS12NB4U Fig 4g 1 2 12 70mm gt 3 8 9 52mm Supplied Reducer Flar
49. NBU tunit 2 Rating conditions are Cooling Indoor air temp 80 F DB 67 F WB Outdoor air temp 95 F DB 75 F WB 1 Outdoor Unit CU 4KS31NBU Indoor Unit CS MKS7NKU x 3 CS MKS9NKU Duct Less Type Rated lt 230V gt Cooling Total Capacity BTU h 29 000 9 800 to 29 000 kW 8 50 2 90 to 8 50 Performance 00 y Sensible Capacity Latent Capacity BTU h e Running Amperes A yO 5 E Contro Fan Speeds Compressor DC Twin Rotary Inverter Refrigerant Amount charged at shipment Ibs g R410A 8 38 3 800 Refrigerant Control Electric Expansion Valve Operation Sound High Cool o UJ Refrigerant Tubing Connections Flare Type Max allowable tubing length per unit ft m 100 30 5 Refrigerant Narrow tube inch mm 1 4 6 35 x 4 Tube Diameter Wide tube inch mm Unit Dimensions inch 35 1 32 x 35 7 16 x 12 19 32 _ Height x Width x Depth mm 890 x 900 x 320 Package Dimensions inch 40 1 8 x 41 11 32 x 16 21 32 6 Height x Width x Depth mm 1 019 x 1 050 x 423 2 Weight Net lbs kg 174 2 79 0 E Shipping Ibs kg 15 88 0 45 DATA SUBJECT TO CHANGE WITHOUT NOTICE Remarks 1 The values shown in performance section and electrical rating section above are based on the following unit combination For other combination unit please refer to the Unit Combination Tables in this manual Indoor Unit CS MKE7NKU 3units CS MKE9NKU 1units
50. NG CAPACITY 30 600 BTU h AIR FLOW RATE 1 036 CFM INDOOR OUTDOOR ENT TEMP F AMBIENT TEMP F 105 115 a 40 6 46 1 33 410 32 280 31 030 30 600 23 790 17 260 15 820 15 410 15 010 14 810 12 200 9 780 35 630 34 460 33 160 33 010 24 460 17 680 10 790 10 380 9 980 9 780 7 170 5 150 TC Total Cooling Capacity BTU h SHC Sensible Heat Capacity BTU h NOTE 1 Rating conditions Indoor Unit Entering Air Temp 80 F 26 7 C DB 67 F 19 4 C WB Outdoor Ambient Temp 95 F 35 C DB 2 Above data does not take Freeze Prevention Protection during cooling operation into account For this reason the value may vary from the actual cooling characteristics 3 Above data represents the value when the operation frequency of a compressor is fixed 54 Outdoor Unit CU 4KS31NBU Indoor Unit CS MKS9NB4U x 4 Power Supply 230V Single Phase 60Hz lt Cooling Capacity gt RATING CAPACITY 28 600 BTU h AIR FLOW RATE 883 CFM INDOOR OUTDOOR ENT TEMP F C AMBIENT TEMP F WB 65 75 85 95 105 115 18 3 23 9 29 4 35 0 40 6 46 1 0 32 920 31 940 30 850 30 690 22 770 16 470 10 040 9 700 9 360 9 360 6 780 4 900 Total Cooling Capacity BTU h SHC Sensible Heat Capacity BTU h NOTE 1 Rating conditions Indoor Unit Entering Air Temp 80 F 26 7 C DB 67 F 19 4 C WB Outdoor Ambient Temp 95 F 35 C
51. Panasonic TECHNICAL amp SERVICE MANUAL OUTDOOR UNIT CU 3KS19NBU CU 4KS24NBU CU 4KS31NBU DC INVERTER MULTI SYSTEM AIR CONDITIONER Capacity at 230V Outdoor Model No Product Code No 1 852 361 24 Cu aKS24NBU 185236126 CU 3KS19NBU 19 700 BTU h 25 400 BTU h 30 600 BTU h CU 4KS31NBU 1 852 361 26 A 5 a n lt gt m 2 o 0 y gt O Wall mounted type CS MKS7NKU CS MKS9NKU CS MKS12NKU CS MKS18NKU CS MKS24NKU Semi concealed type CS MKS9NB4U 8 CZ 18BT1U CS MKS12NB4U 8 CZ 18BT1U CS KS18NB4UW 8 CZ 18BT1U CU 4KS24NBU IMPORTANT These air conditioners employ new refrigerant R410A CU 4KS31NBU Pay special attention when servicing the unit GO GO AER SES GSES O O REFERENCE NO SM700877 N SAFETY PRECAUTIONS Before doing repair work please read the N SAFETY PRECAUTIONS carefully and fully understand them The precautionary items here are divided into A Warning and A Caution items Items in particular which may cause death or serious injury to the service personnel if the work is not performed correctly are included in the AN Warning table However even precautionary items identified as NCaution also have the potential for serious consequences if not performed correctly Important safety precautions are described for all items in both categories B
52. able and wires between the indoor and outdoor units Electrical noise may affect the operation 5 3 Wiring System Diagram 3 indoor units with CU 3KS19NBU Disconnect switch Field supply I I 230 208V 30 208 OUTDOOR UNIT Terminal 9P a Sle O 230 208V e a O lt Grounding 5 lin Disconnect i B N switch Field supply T EE O E 230 208V 5 m ES 230 208V lt SIE 2777 E 230 208 a O gt o lt Grounding gt Disconnect line 9 switch Field supply 230 208V O 2 7 5 8 230 208V 5 2 Z C 28 gt o E 230 208V O a E Jo A 2 265 Grounding line Terminal e 2P Fig 25a 23 To avoid the risk of electric shock each air conditioner unit must be grounded For the installation of a grounding device please observe local electrical codes e Grounding is necessary especially for units using inverter circuits in order to release charged electricity and electrical noise caused by high tension Otherwise electrical shock may occur Place a dedicated ground more than 7 2 away from other grounds and do not have it shared with other electric appliances NOTE Disconnect switch may be required by national or local co
53. acuum pump Electronic scale for charging refrigerant Flare tool Bender Tools which can be com Torque wrench monly used for R22 R407C and R410A Cutter reamer Welding tool nitrogen gas cylinder ern The above tools specifically for R410A must not be used for R22 and R407C Doing so will cause malfunction of the unit For the above vacuum pump 1 2 and vacuum pump adapter 3 those for R22 type units can be used for R410A type However they must be used exclusively for R410A and never alternately with R22 and R407C To prevent other refrigerants R22 R407C from being mistakenly charged to this unit shape and external diameter of the service port screw has been altered lt External diameter of service port gt R410A 5 16 R22 407 1 4 9 4 Tubing Installation Procedures When the tubes are connected always apply HAB oil on the flare portions to improve the sealing of tubing The following is the HAB oil generally used Esso ZERICE 532 For details on tubing installation procedures refer to the installation manuals attached to the indoor unit and outdoor unit 81 9 5 In Case of Compressor Malfunction CAUTION Should the compressor malfunction be sure make the switch to a replacement compressor as quickly as possible Use only the tools indicated exclusively for R410A See 9 3 Tools Specifically for R410A 9 5 1 Procedure for Replacing Compressor 1 R
54. al Controller Over Current Protection Over Heat Protection Run Capacitor Micro F VAC Heat Exchanger Coil Face Area ft m DATA SUBJECT TO CHANGE WITHOUT NOTICE 18 Outdoor Unit CU 4KS31NBU Control PCB CB CU 4KS31NBU Control Circuit Fuse 250V 25A Compressor DC Twin Rotary Hermetic Compressor Model Nominal Output 5JD420XAB22 3 000W Compressor Oil Amount Pints cc FV50S 2 55 1 200 Coil Resistance Ambient Temp 68 F 20 C Ohm Safety Device CT Peak current cut off control Yes Compressor Discharge Temp Control Yes Operation cut off control in abnormal ambient Temp Yes Overload Relay Model CS 7L 2515 Operation Temp Open 239 F 115 C Close 212 F 100 C Run Capacitor Micro F VAC Crankcase Heater 230V 30W Propeller Q ty Dia inch mm 1 D18 1 8 D460 O FNommaQuput Coil Resistance Ambient Temp 68 F 20 Safety Device Type Internal Controller Over Current Protection Over Heat Protection Run Capacitor Micro F VAC Heat Exchanger Coil Face Area ft m DATA SUBJECT TO CHANGE WITHOUT NOTICE 19 2 3 Other Component Specifications Model No Quantity of Sensor sensor Name 9 Sensor CU 3KS19NBU CU 4KS24NBU CU 4KS31NBU Outdoor air temp sensor TKS295B Outdoor heat exchanger sensor TKS292B Mismo mses _ owrwemo ws
55. al charge charging voltage DC 311 V even after the power is turned OFF and some time is required for the charge to dissipate Be careful not to touch any electrified parts before the control circuit board Power Lamp red turns OFF If the outdoor control circuit board is normal approximately 180 seconds will be required for the charge to dissipate However allow at least 30 minutes for the charge to dissipate if it is thought there might be trouble with the outdoor control circuit board For example if the outdoor control circuit board fuse has blown approximately 30 minutes will be required to discharge the high capacity electrolytic capacitors 71 8 2 Trouble Diagnosis by Error Monitor Lamps To prevent electric shock do not inspect or repair until the Power Lamp on the P C Board is turned off 8 2 1 Location of the Error Monitor Lamps Remove the top plate of outdoor unit and the cover of Electrical Component Box The Power Lamp and Error Monitor Lamps are located on the P C Board of Electrical Component Box Fig 1 Heat Exchanger Rear side P C Board of Electrical Component Box Error Monitor Lamps Power Lamp lt gt ERRO ERR1 5D x5 ERR2 gt Fig 1 View from top Front side 8 2 2 Display of the Error Monitor Lamps If a protective device has activated or there is a sensor failure in the outdoor unit the 4 error monitor lamps on the outdoor control circuit board will indicate the
56. another indoor unit is ON The thermostat turns After the thermostat turns ON again the ON again outdoor unit will not operate for 3 minutes even if the room temperature increases above the desired temperature After 3 minutes the outdoor unit begins operating automatically During these 3 minutes a pressure balance is achieved allowing the compressor to start more easily Freeze prevention When the temperature of the indoor heat exchanger drops to approximately 35 6 F or below the compressor turns OFF the outdoor fan turns OFF and the indoor fan continues operating with no changes In order to protect against freezing the compressor stops temporarily until the temperature of the indoor heat exchanger has risen Approximately 3 minutes later if the temperature of the indoor heat exchanger is adove 46 4 F the system returns to its Original conditions Stop All indicator lamps turn OFF The indoor and outdoor units stop Operation is restarted Starts operating in the same operating mode Within 4 hours after operation was stopped it is within 4 hours only when COOL and with the same temperature assumed that there has been no significant AUTO mode is selected settings as before operation was stopped change in the indoor and outdoor temperatures with the remote and the previous conditions COOL are stored controller Operation starts after 4 New operating mode is determined based on hours or mor
57. arefully refer to the wiring diagram and these instructions when wiring Improper connections and inadequate grounding can cause accidental injury or death Ground the unit following local electrical codes Connect all wiring tightly Loose wiring may cause over heating at connection points and a possible fire hazard To prevent possible hazards from insulation failure the unit must be grounded When Transporting 000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 Be careful when picking up and moving the indoor and out door units Get a partner to help and bend your knees when lifting to reduce strain on your back Sharp edges or thin alu minum fins on the air conditioner can cut your fingers When Installing 000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 Select an installation location which is rigid and strong enough to support or hold the unit and select a location for easy maintenance In a Ceiling or Wall Make sure the ceiling wall is strong enough to hold the unit s weight It may be necessary to construct a strong wood or metal frame to provide added support Ina Room Properly insulate any tubing run inside a room to prevent sweating that can cause dripping and water damage to walls and floors Keep the fire alarm and the air
58. city BTU 20 600 Latent Capacity BTU 3 800 Voltage Rating Performance Compressor Locked Rotor Amperes 13 0 Fuse or Circuit Breaker Capacity Air Circulation High ft min m h 1 707 2 900 Available Voltage Range 18710 253 12 1 Power Input W 2 460 5 Power Factor EER BTU h W 9 Lu NO O Outdoor Unit Microprocessor Auto Hi Me Lo DC Twin Rotary Inverter R410A 6 17 2 800 Electric Expansion Valve Control Fan Speeds Compressor Refrigerant Amount charged at shipment Ibs g Refrigerant Control Operation Sound High Cool Q r gt Refrigerant Tubing Connections Flare Type Max allowable tubing length per unit ft m 82 25 Refrigerant Narrow tube inch mm 1 4 6 35 x 4 Tube Diameter Wide tube inch mm 3 8 9 52 x 3 1 2 12 7 x 1 5 Outdoor Unit Unit Dimensions inch 29 1 8 x 35 7 16 x 12 19 32 Height x Width x Depth mm 740 x 900 x 320 Package Dimensions inch 34 3 16 x 41 11 32 x 16 21 32 6 Height x Width x Depth mm 868 x 1 050 x 423 2 Weight Net lbs kg 138 9 63 0 E Shipping Ibs kg 13 41 0 38 DATA SUBJECT TO CHANGE WITHOUT NOTICE Remarks 1 The values shown in performance section and electrical rating section above are based on the following unit combination For other combination unit please refer to the Unit Combination Tables in this manual Indoor Unit CS MKS9NKU Outdoor Unit CU AKS24
59. ction align the union tube and flare tube straight with each other then screw in the flare nut lightly at first to obtain a smooth match Fig 13 3 5 Tubing Connections a Temporary connection Screw in 5 turns by hand Fig 14 b To fasten the flare nuts apply specified torque as Table 4 Tube Dia Nut Tightening Torque Fig 9 If the previous flare tool clutch type is used 0 0472 1 2 Adjust so that the amount of tube protrusion is as shown in the figure Fig 10 AS If the special R410A flare tool is used 0 to 0 0196 0 to 0 5 mm Copper tubing Flare tool Fig 11 Apply refrigerant lubricant here and here Fig 12 Union Flare nut Fig 13 1 4 6 35 mm 3 8 9 52 mm 21 32 17 mm 7 8 22 mm Approx 120 160 Ibs in 140 180 kgf cm Approx 300 360 Ibs in 340 420 kgf cm 1 2 12 70 mm 5 8 15 88 mm 1 1 32 26 mm 1 5 32 29 mm Approx 430 480 Ibs in 490 550 kgf cm Approx 590 710 Ibs in 680 820 kgf cm Service valve on narrow tube side lt Les O lt lt S REX Service valve on wide tube side lt gt Fig 14 P2 CY x DN 17 gt lt D RET gt Y XO aS Apply the provided labels to the indoor and outdoor unit tubing connectors to prevent errors in connections Be sure to match refri
60. cuit board Refer to 8 3 1 Checking the outdoor unit Do not remove or insert the outdoor control circuit board connector when power is being supplied to it The controller will be damaged 2 Fuse Check it visually or the continuity with a tester 3 Compressor Check for an open circuit in the compressor coil winding 4 Compressor protective sensor compressor discharge temperature thermistor Check that the senseor is securely contained in the thermostart holder 5 Coil thermistor Check that the sensor is securely contained in the thermostat holder 75 6 Electric expansion valve When replacing the electric expansion valve and coil be sure to attach the connectors in the correct positions Labels are applied to the valve body and coil corresponding to the connector colors to identify them Use a multi meter to measure the voltage 12 V When the power is turned ON the needle will move in the following seguence in approximately 10 to 20 seconds for No voltage on circuit board Voltage varies each point Model No Controller check CU 3KS19NBU MVO MV1 MV2 CU 4KS24NBU CU 4KS31NBU MV0 MV1 MV2 Check the coil resistance Check the resistance between the gray lead wire and the other wires Check the illumination of the red Power Lamp Resistance is OK if it is 46 4ohm at 68 F Approx 46 4 ohm Hi Replace the co
61. des CAUTION Always comply with national and local code requirements 4 indoor units with CU 4KS24NBU CU 4KS31NBU Disconnect switch Field supply OUTDOOR UNIT 230 208V AS B Terminal 12P 230 208V u Grounding line Disconnect switch B Field supply gt INDOOR UNIT Terminal T INDOOR UNIT Terminal no S N N 8 lt lt C PEC UNIT B 230 208V Grounding line Disconnect switch Inter unit Field supply power line N E O lt 5 e S _ O g x E 230 208V TY E S o E z q 230 208V B 3 EP e m 2 Grounding P line 230 208V E o Disconnect switch 5 Field supply 5 E 2 E 230 208V E 9 0 OE 230 208V sc z 2 E Grounding B line Fig 25b 5 4 How to Connect Wiring to the Terminal WARNING Loose wiring may cause the N terminal to overheat or result in unit malfunction A fire hazard may also exist There fore be sure all wiring is tightly connected When connecting each power wire to the corresponding terminal follow the instructions How to connect wiring to the terminal and fasten the wire securely tight with the fixing screw of the terminal plate How to connect wiring to the terminal a For Indoor Unit 1 Cu
62. e CT Peak current cut off control Yes Compressor Discharge Temp Control Yes Operation cut off control in abnormal ambient Temp Yes Overload Relay Model CS 7L 2515 Operation Temp Open 239 F 115 C Close 212 F 100 C Run Capacitor Micro F VAC Crankcase Heater 230V 30W Propeller Q ty Dia inch mm 1 D18 1 8 D460 Nominal Output Coil Resistance Ambient Temp 68 F 20 C Safety Device Type Internal Controller Over Current Protection Over Heat Protection Run Capacitor Micro F VAC Heat Exchanger Coil Face Area ft m DATA SUBJECT TO CHANGE WITHOUT NOTICE 17 Outdoor Unit CU 4KS24NBU Control PCB CB CU 4KS24NBU Control Circuit Fuse 250V 25A Compressor DC Twin Rotary Hermetic Compressor Model Nominal Output 5KD240XAB21 1 700W Compressor Oil Amount Pints cc FV50S 1 91 900 Coil Resistance Ambient Temp 68 F 20 C Ohm U V 0 720 V W 0 708 W U 0 726 Safety Device CT Peak current cut off control Yes Compressor Discharge Temp Control Yes Operation cut off control in abnormal ambient Temp Yes Overload Relay Model CS 7L 2515 Operation Temp Open 239 F 115 C Close 212 F 100 C Run Capacitor Micro F VAC Crankcase Heater 230V 30W Propeller Q ty Dia inch mm 1 D18 1 8 D460 Nominal Output Coil Resistance Ambient Temp 68 F 20 C Safety Device Type Intern
63. e 1 2 12 70mm Union 3 8 9 52mm Outdoor unit Indoor unit 1 2 12 70mm CS MKS18NKU CS KS18NB4UW E C s oo 1 2 12 70mm 1 4 6 35mm ae a 3 8 9 52mm 1 4 6 35mm i n CS MKS7NKU CS MKS9NKU CS MKS12NKU MKS9NB4U CS 3 8 9 52mm TIE CS MKS9NBAU CS MKS12NBAU Fig 4h C Outdoor unit 1 2 12 70mm Indoor unit D CS MKS18NKU 1 2 12 70mm 4 5445 70mm CS KS18NB4UW C CS MKS18NKU 1 2 12 70mm a CS KS18NB4UW B CS MKS7NKU CS MKS9NKU CS MKS12NKU 3 8 9 52mm CS MKS9NBAU CS MKS12NBAU A CS MKS7NKU CS MKS9NKU CS MKS12NKU TS CS MKS9NB4U CS MKS12NB4U Fig 4i 1 2 12 70mm 5 8 15 88mm Locally purchased 1 4 Flare 1 2 12 70mm Union 5 8 15 88mm Outdoor unit Indoor unit 5 8 15 88mm Dlg CS MKS24NKU 1 2 12 70mm 3 8 9 52 CS MKS7NKU CS MKS9NKU CS MKS12NKU CS MKS9NB4U CS MKS12NB4U CS MKS7NKU CS MKS9NKU CS MKS12NKU CS MKS9NB4U CS MKS12NB4U 1 2 12 70mm T 1 4 6 35mm 3 8 9 52mm 3 8 9 52mm 1 4 6 35mm 3 8 9 52mm CS MKS7NKU CS MKS9NKU CS MKS12NKU CS MKS9NB4U CS MKS12NB4U 1 4 6 35mm Flare 1 2 12 70mm Union 3 8 9 52mm A A CENT 1 2 12 70mm gt 3 8 9 52mm Supplied Reducer Fig 4j 3 8 9 52mm E 1 2 12 70mm gt 5 8 15 88mm Locally purchased Flar
64. e 1 2 12 70mm Union 5 8 15 88mm Outdoor unit Indoor unit 5 8 15 88mm HE CS MKS24NKU 1 2 12 70mm 1 4 6 35mm 1 2 12 70mm C mE CS MKS18NKU 1 2 12 70mm I 635m SES CS KS18NB4UW B CS MKS7NKU CS MKS9NKU CS MKS12NKU mE CS MKS9NB4U CS MKS12NB4U 4 UN CS MKS7NKU CS MKS9NKU CS MKS12NKU secon SE CS MKS9NB4U CS MKS12NB4U Fig 4k 10 2 3 Outdoor Unit AVOID heat sources exhaust fans etc Fig 5a damp humid or uneven locations DO choose a place as cool as possible choose place that is well ventilated install in a location where at least two sides are unob structed so that the flow of air at the intake port or exhaust port is not blocked and so that sufficient space is ensured for maintenance to be carried out without trouble In general the top also must be unob structed Fig 5b provide a solid base level concrete pad concrete block 6 x 1 4 15 x 40 cm beams or equal a minimum of 6 15 cm above ground level to reduce humidity and protect the unit against possible water damage and decreased service life Figs 5c and 5d CAUTION install cushion rubber under unit s feet to reduce vibration and noise Fig 5e A solid base must not cover the hole of the bottom plate use lug bolts or equal to bolt down unit reducing vibration and noise install in a location where no antenna of a television
65. e amount in the charging cylinder is less than 20 83 Configuration and characteristics of cylinders Valve Single valve Charge liquid refrigerant with cylinder in up side down position Fig 1 Single valve with siphon tube Charge with cylinder in normal position Fig 2 a NO Charging cylinder Refrigerant cylinder Fig 3 9 6 In Case Refrigerant is Leaking CAUTION Never attempt to charge additional refrigerant when refrigerant has been leaking from the unit Follow the procedure described below to locate points of leaks and carry out repairs then recharge the refrigerant 1 Detecting Leaks Use the detector for R410A to locate refrigerant leak points 2 Recovering refrigerant Never release the gas to the atmosphere recover residual refrigerant using the refrigerant recovery unit for R410A instead Do not reuse the recovered refrigerant because its composition will have been altered 3 Welding leaking points Confirm again that no residual refrigerant exists in the unit before starting welding Weld securely using flux wax for R410A Prevent oxide film from forming inside the tubes utilizing substitution with nitrogen N2 in the refrigerant circuit of the unit Leave ends of tubes open during welding 4 Checking for sealing Use nitrogen gas for the pressurized gas and never use a refrigerant other than R410A Also do no
66. e have the temperature conditions at the time the passed ON OFF operation button is pressed Frequency control senconds Q Hz Outdoor air temperature is below 32 F Outdoor air temperature is 32 F or higher 25 Hz 120 seconds 60 seconds 35 Hz 60 seconds 30 seconds 45 Hz 60 seconds 30 seconds 55 Hz 180 seconds 90 seconds Table 1 66 1 f fluctuation fan NEN Control conditions Unit operation Explanation SENSOR The ON OFF operation The operation lamp illuminates The outdoor unit does not operate for 3 minutes DRY button on the remote The indoor fan operates at the set fan speed even after the breaker is turned ON controller is pressed The outdoor unit stops The outdoor unit starts The frequency is increased at the rate of 0 5 Hz every 1 seconds Compressor and the outdoor fan start When the frequency reaches Hz This is in order to stabilize the return of oil to the frequency increases are stopped for a period compressor of B seconds Refer to Table 1 The frequency then increases If the indoor and outdoor temperatures are high the current peak cut off activates stopping any increases in frequency The room temperature DRY operation starts Operating frequency is stabilized in order to reaches the desired maintain a comfortable environment temperature and there is no need for further DRY A operation The indoor fan cha
67. e sure to carefully follow all of them Symbol Indication A This symbol indicates items to which we need to pay attention In this triangle a definite precautionary item is described Q This symbol indicates the item to be prohibited In or close to this circle a prohibited item is described o This symbol indicates the items requiring special attention or instruction In or close to this circle a prohibited item is described e After doing repair work perform a test run to confirm that there are no abnormalities At the same time explain the precautions in use to the user N Warning Before performing an overhaul disconnect the power plug or power cable from the unit Performing the work with the power supplied to the unit may cause an electric shock When repair work or circuit inspection that requires power supply for the air conditioner is to be performed do not touch the charging section Doing so may cause an electric shock For the step up capacitor attached to the electric section perform the repair work after sufficiently discharging it Insufficient capacitor discharge may cause an electric shock Do not perform repair work on the electric sections with wet hands Doing so may cause an electric shock Do not start or stop the air conditioner by means of connecting or disconnecting the power plug Doing so may cause an electric shock or fire When conducting repair work only use components included in the parts l
68. e time several seconds but then quickly stops when the outdoor unit operates There is trouble in the system that provides feedback of motor rotation speed from the motor to the outdoor unit controller Trouble symptom 4 Fan motor rotation speed does not change during outdoor unit operation Trouble symptom 5 Fan motor rotation speed varies excessively during outdoor unit operation Remedy for symptom 3 to 5 It is not possible to identify whether the trouble is outdoor unit controller trouble or motor trouble Therefore first replace the outdoor unit controller then if necessary replace the DC motor 78 9 REFRIGERANT R410A SPECIAL PRECAUTIONS WHEN SERVICING UNIT 9 1 Characteristics of New Refrigerant R410A 9 1 1 What is New Refrigerant R410A R410A is a new refrigerant that contains two types of pseudo non azeotropic refrigerant mixture Its refrigeration capacity and energy efficiency are about the same level as the conventional refrigerant R22 9 1 2 Components mixing proportions HFC32 50 HFC 125 50 9 1 3 Characteristics Less toxic more chemically stable refrigerant The composition of refrigerant R410A changes whether it is in a gaseous phase or liquid phase Thus when there is a refrigerant leak the basic performance of the air conditioner may be degraded because of a change in composition of the remaining refrigerant Therefore do not add new refrigerant Instead recover the remaining refrig
69. ease refer to your local elec trical codes Carefully observe these regulations when car rying out the installation Table 6 shows maximum wire lengths for control line and power line and fuse or circuit capacity Refer to the wiring system diagram Fig 25a or 25b for the meaning of A B and C in Table 6 Refer to your local codes or in the absence of local codes see the National Electric Code ANSI NFPA70 Table 6 Max Power Line Length ft Max Control Line Length ft A B C 412 414 CU 3KS19NBU 85 Max 82 Max Fuse or Circuit Capacity CU 4KS24NBU 85 Max 82 Max CU 4KS31NBU 100 Max 22 AWG American Wire Gauge NE e Be sure to comply with local codes on running the wire from the indoor unit to the outdoor unit size of wire and wiring method etc e Each wire must be firmly connected e No wire should be allowed to touch refrigerant tubing the compressor or any moving part e Be sure to connect power wires correctly match ing up numbers on terminals of the outdoor unit and respective indoor units A D CAUTION e Be sure to connect the power supply line to the outdoor unit as shown in the wiring diagram The indoor unit draws its power from the outdoor unit e Do not run wiring for antenna signal or power lines of television radio stereo telephone secu rity system or intercom any closer than 3 4 1 m from the power c
70. ecovering refrigerant Any remaining refrigerant inside the unit should not be released to the atmosphere but recovered using the refrigerant recovery unit for R410A e Do not reuse the recovered refrigerant since it will contain impurities 2 Replacing Compressor e Soon after removing seals of both discharge and suction tubes of the new compressor replace it quickly 3 Checking for sealing Use nitrogen gas for the pressurized gas and never use a refrigerant other than R410A Also do not use oxygen or any flammable gas 4 Evacuation e Use solenoid valve installed vacuum pump so that even if power is cut off in the middle of evacuation of air due to a power interruption the valve will prevent the pump oil from flowing back e The equipment may be damaged if moisture remains in the tubing thus carry out the evacuation thoroughly e When using a vacuum pump with exhaust air volume more than 0 883 cu ft min and ultimate vacuum pressure rate of 50 micron Hg Standard time for evacuation 1 Recover refrigerant OK 2 Replace compressor OK 3 Check for sealing OK 4 Evacuation OK 5 Recharge Length of tubing Less than 33 ft 10 m More than 33 ft 10 m More than 10 minutes More than 15 minutes 82 5 Recharging Be sure to charge the specified amount of refrigerant in liquid state using the service port of the wide tube service valve The proper amount is listed
71. el C and the conduit plate Fig 33 7 Connecting a Home Automation Device The HA white 4P terminal is located on the indoor unit PCB If a HA device will be used connect it to this terminal 8 Installation Check Sheet The strength of the installation location is sufficient to support the air conditioner weight The indoor and outdoor units are installed level and vertically The power and voltage are as specified Inter unit cables are securely fastened to the terminal board Inter unit cables are securely fixed The power cable and inter unit cables are not connected anywhere along their paths The ground wire is securely connected An air purge of the refrigerant circuit has been conducted A leak test of the tubing connections has been performed Thermal insulation has been applied to the tubing connections Drain connections are secure and water drains properly Putty has been used to close the hole in the wall All service valves are fully open Remote controller signals are being positively received 27 DC1111 0
72. epending on the indoor unit type e Check each performance value in test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 48 Outdoor Unit CU 4KS31NBU Indoor Unit CS KS18NB4UW x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart i Gel Dom ge om I4 Lo far i LL bl gt LLL 0 E Indoor air temp 86 F 30 C 8H SERERE OF 27 C Ed ie 8 j sasa 2 gt 90 0 6 77 4 25 30 38 Outdoor air temperature F C 2 Operating current performance chart y eu I X HHH DE lt 8 DATE E 5 o 7 D S e O 6 L1 5 77 86 95 104 25 30 35 40 Outdoor air temperature F C 3 Indoor discharge air performance chart Xem O 64 4 18 u 60 8 16 57 2 14 o 0 5 53 6 12 EX see 27 aL 50 0 10 m go r 2 46 4 8 o 2 5 42 8 6 39 2 4 Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mo
73. er to Fig 24 If pump down is not possible If the air conditioner cannot be operated because of a malfunction or other cause use a refrigerant recovery device to recover the refrigerant 21 Narrow tube side Charging port Wide tube side Charging hose Fig 24 After disconnecting the inter unit tubes attach the flare nuts with flare bonnets 5 Wiring Instructions 5 1 General Precautions on Wiring 1 Before wiring confirm the rated voltage of the unit as shown on its nameplate then carry out the wiring closely following the wiring diagram 2 Provide a power outlet to be used exclusively for each unit with a power supply disconnect and circuit break er for overcurrent protection provided in the exclusive line 3 To prevent possible hazard due to insulation failure the unit must be grounded 4 Each wiring connection must be done tightly and in accordance with the wiring system diagram Wrong wiring may cause the unit to misoperate or become damaged 5 Do not allow wiring to touch the refrigerant tubing compressor or any moving parts of the fan 6 Unauthorized changes in the internal wiring can be very dangerous The manufacturer will accept no responsibility for any damage or misoperation that occurs as a result of such unauthorized changes 5 2 Recommended Wire Length and Diameter Regulations on wiring diameter differ from locality to locality For field wiring requirements pl
74. erant with the refrigerant recovery unit Then after evacuation totally recharge the specified amount of refrigerant with the new refrigerant at its normal mixed composition state in liquid phase When refrigerant R410A is used the composition will differ depending on whether it is in gaseous or liquid phase and the basic performance of the air conditioner will be degraded if it is charged while the refrigerant is in gaseous state Thus always charge the refrigerant while it is in liquid phase Ether type oil is used for compressor oil for R410A type units which is different from the mineral oil used for R22 Thus more attention to moisture prevention and faster replacement work compared with conventional models are required 79 9 2 Checklist before Servicing Use a clutch type flare tool for R410A or the conventional flare tool Note that sizes of the resultant flares differ between these two tools Where a conventional flare tool is used make sure to observe A Specification amount of extrusion by using the flare spacer Specification A Diameter of tube D Flare tool for R410A Conventional flare tool for R22 Dia 1 4 6 35 mm 0 to 0 0196 Dia 1 2 12 7 mm 0 to 0 5 mm Dia 5 8 15 88 mm Dia 3 8 9 52 mm Size of flare dep Flare tool for R410A Conventional flare tool R22 e Tubing precautions Refrigerant R410A is more easily affected by dust or moisture compared with R22 thus be sure to
75. eration you must Carefully read this instruction booklet before beginning Follow each installation or repair step exactly as shown Observe all local state and national electrical codes Pay close attention to all warning and caution notices given in this manual This symbol refers to a hazard or unsafe practice which can WARNING result in severe personal injury or death This symbol refers to a hazard or unsafe practice which can result in personal injury or prod CAUTION uct or property damage If Necessary Get Help These instructions are all you need for most installation sites and maintenance conditions If you require help for a special problem contact our sales service outlet or your certified dealer for additional instructions In Case of Improper Installation The manufacturer shall in no way be responsible for improp er installation or maintenance service including failure to follow the instructions in this document SPECIAL PRECAUTIONS WARNING When Wiring 0009000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 ELECTRICAL SHOCK CAN CAUSE SEVERE PERSONAL INJURY OR DEATH ONLY A QUALIFIED EXPERIENCED ELECTRICIAN SHOULD ATTEMPT TO WIRE THIS SYSTEM Do not supply power to the unit until all wiring and tubing are completed or reconnected and checked Highly dangerous electrical voltages are used in this system C
76. faces of the unit are unobstructed principle the top direction should be unobstructed Power breaker Uf Uy Z Uff Uf if LM Uy 7 Uf Z 2 Z Z m 2 Z Z UU Wf Uf YM 77 1111111117777 Z Z Uf Wy m 10 Wy Wy Z RS SES Ground Fasten with anchor bolts wire not not provided 3 8 or M10 4 locations provided 15 Access panel Wall mounted types Ceiling mounted cassette types 3 Installation Process 3 1 Embedding the Tubing and Wiring Do not connect tubes to locations that are embedded Be sure to bind refrigerant tubing and inter unit cables together with vinyl tape The power cable must be obtained on site 12 Less than 85 ft AWG American Wire Gauge Be sure to apply the provided labels to both ends of the inter unit cables to prevent miswiring Securely seal the end of embedded tubing with vinyl tape in order to prevent dirt or moisture entry In order to prevent insulation breakdown and ground faults do not allow the wire ends to come in contact with rainwater or be subject to dew condensation 3 2 Use of the Flaring Method Many of the conventional split system air conditioners
77. ffle Remove the panels front top side L and R from the unit and drill 4 holes of 1 4 inch 6 5 mm at the prescribed positions Install the windbaffle on the unit using field supply bolts and nuts Recommended bolts to be used are 15 64 M6 ISO standard and the recommended length of the bolts is between 13 32 19 32 inch 10 15 Use washers and spring washers to tightly fasten the windbaffle to the unit Panel side R Panel top Panel front T7 UW SS 222 2 22 SS SSS A N NN N NNNM NN N NN NN NS 2 SSSS NN Z YA A N N A XS NW NS SS NN SSS AK NS 22222 p Z AN A NN NN NS NN NS Panel side L Fig 5j e n order to prevent contact of the bolts and heat exchanger and other parts inside the unit install the windbaffle using bolts from inside the unit and fasten the bolts with nuts from outside the unit e When the windbaffle is installed on the unit the unit has higher wind resistance In order to prevent the unit from falling over anchor the legs of the unit using anchor bolts or similar method 4 Precautions for installation 1 Be sure not to damage painted surfaces 2 Finish the edges of the windbaffle to avoid cuts or injury 3 Drilling of holes must be carefully done so that no damage i
78. ft 7 5m If the tubing length is different the performance chart will vary 30 Outdoor Unit CU 3KS19NBU Indoor Unit CS MKS9NB4U x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart CS REN E psig MPaG 5 Low pressure at wide tube service valve me air temperature F C 2 Operating current performance chart 6 L Omm mm Operating current T air m C 3 Indoor discharge air performance chart Indoor discharge air temperature F al D 3 53 6 12 50 0 10 46 4 8 77 86 95 104 25 30 35 40 Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 31 Outdoor Unit CU 3KS19NBU Indoor Unit CS MKS12NBAU x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart 2 7 Ce o 2 160
79. g Indoor airtemp 80 F DB 67 F WB Outdoor air temp 95 F DB 75 F WB Outdoor Unit CU 3KS19NBU MKS9NK Indoor Unit CS SONKU x 3 lt 208V gt 3 Room Multi Outdoor Unit Number of Connectable Indoor Units Number of Operatable Indoor Units 3 208V Single Phase 60Hz Cooling Total Capacity BTU h 18 800 9 800 to 18 800 kW 5 50 2 90 to 5 50 Sensible Capacity BTU 16 000 Latent Capacity BTU 2 800 Voltage Rating Performance Compressor Locked Rotor Amperes 13 0 Fuse or Circuit Breaker Capacity Air Circulation High ft min m h 1 707 2 900 o Available Voltage Range 187 to 253 E Power Input W 1 500 5 Power Factor i EER BTU h W 12 5 9 Lu Outdoor Unit Microprocessor Auto Hi Me Lo DC Twin Rotary Inverter R410A 6 17 2 800 Electric Expansion Valve Control Fan Speeds Compressor Refrigerant Amount charged at shipment Ibs g Refrigerant Control Operation Sound High Cool o UD N O I Refrigerant Tubing Connections Flare Type Max allowable tubing length per unit ft m 82 25 Refrigerant Narrow tube inch mm 1 4 6 35 x 3 Tube Diameter Wide tube inch mm 3 8 9 52 x 3 5 Outdoor Unit Unit Dimensions inch 29 1 8 x 35 7 16 x 12 19 32 Height x Width x Depth mm 740 x 900 x 320 Package Dimensions inch 34 3 16 x 41 11 32 x 16 21 32 6 Height x Width x Depth mm 868 x 1 050 x 423 2 Weight Net
80. gerant tubing and electric wiring between indoor and outdoor units 3 6 Insulation of Refrigerant Tubing IMPORTANT To prevent heat loss and wet floors due to dripping of con densation both tubes must be well insulated with a proper insulation material The thickness of the insulation should be a minimum 5 16 8 mm Fig 16 B For wall mounted units After connecting the refrigerant tubing to the outdoor unit and performing a leak test on the connecting part insulate it with the tubing insulation Fig 17a For ceiling mounted cassette units Wind the insulation tape around the flare nuts at the tube connections Secondly cover up the tubing connections with the flare insulation 1 8 T3 supplied Then wind the other flare insulation 3 16 T5 supplied Finally fasten the insulation at both ends with the supplied vinyl ties Fig 17b Insulation material The material used for insulation must have good insulation characteristics be easy to use be age resistant and must not easily absorb moisture 18 Torque wrench Indoor unit Spanner Outdoor unit Fig 15 Insulation Thickness Min min 5 16 5 16 8 mm 8 mm Fig 16 Insulation Fig 17a Insulation tape supplied Flare insulation 3 16 T5 supplied lt insulation 1 8 T3 supplied Tube insulation supplied Flare nut Vinyl tie Supplied Fig 17b Drain hose insulation
81. gerant gas leaks during the work ventilate the room If refrigerant gas catches fire harmful gas may be generated Do not mix any gas other than the specified refrigerant gas in the refrigerating cycle If air or other contaminants mix with the gas pressure will become extremely high in the refrigerating cycle Prohibit which may cause a unit breakdown When the welded section of the compressor intake or discharge pipe is to be disconnected perform it in a well ventilated place after sufficiently recovering the refrigerant gas Any residue gas may jet out refrigerant or refrigerating machine oil which may cause an injury When the work is to be performed in a high place About 2 meters or more make sure to wear a safety helmet gloves and safety belt Insufficient safety gear may cause a serious injury in case of a fall When the unit is to be relocated confirm that the new installation location has sufficient strength for the weight of the unit Insufficient strength of the installation location and incomplete installation work may cause injury due to the unit falling When the remote controller batteries are replaced dispose of the old batteries out of the reach of children If a child swallows a battery make sure that the child gets immediate medical attention Do not wash the air conditioner with water as this may cause an electric shock or fire S Prohibit For the repair work in places with high humidity or moisture ma
82. h x Depth mm 740 x 900 x 320 Package Dimensions inch 34 3 16 x 41 11 32 x 16 21 32 6 Height x Width x Depth mm 868 x 1 050 x 423 2 Weight Net lbs kg 138 9 63 0 E Shipping Ibs kg 13 41 0 38 DATA SUBJECT CHANGE WITHOUT NOTICE Remarks 1 The values shown in performance section and electrical rating section above are based on the following unit combination For other combination unit please refer to the Unit Combination Tables in this manual Indoor Unit CS MKE7NKU 1units CS MKE9NKU 2units Outdoor Unit CU 4KS24NBU unit The combination indoor unit is AHRI 210 240 2 Rating conditions are Cooling Indoor airtemp 80 F DB 67 F WB Outdoor air temp 95 F DB 75 F WB 1 Outdoor Unit CU 4KS24NBU MKS9NK Indoor Unit CS SONKU x 3 4 Room Multi Outdoor Unit Number of Connectable Indoor Units Number of Operatable Indoor Units 4 230V Single Phase 60Hz Cooling Total Capacity BTU h 25 400 9 800 to 25 400 kW 7 50 2 90 to 7 50 Sensible Capacity BTU 21 400 Latent Capacity BTU 4 000 Voltage Rating Performance Compressor Locked Rotor Amperes 13 0 Fuse or Circuit Breaker Capacity Air Circulation High ft min m h 1 707 2 900 o Available Voltage Range 18710 253 E 13 Power Input W 2 560 5 Power Factor S EER BTU h W 9 Lu NO O Outdoor Unit Microprocessor Auto Hi Me Lo DC Twin Rotary Inverter R410A
83. ice valve Outdoor air temperature F C 2 Pee current chart Operating current A s air Emm x C 3 Indoor discharge air performance chart io bm S 60 8 16 9 57 2 14 D 5 53 6 12 X o 2 50 0 10 O O 46 4 8 77 86 95 104 25 30 35 40 Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 36 Outdoor Unit CU 4KS24NBU Indoor Unit CS MKS18NKU x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart psig MPaG 5 SS Low pressure at wide tube service valve 95 104 25 30 35 40 Outdoor air temperature F C 2 Operating current performance chart Operating current A 7 86 95 104 5 30 35 40 Outdoor air temperature F C TON 3 Indoor discharge air performance chart CSN TE CIEL Indoor
84. in 200 250 kgf cm Tighten by hand then use a wrench to turn 45 Perform the air purge for tubes A B C and D Use the same Spindle procedures for all tubes 1 Check that each tube both narrow and wide tubes UNE 20 threads between the indoor and outdoor units have been proper ly connected and all wiring for the test run has been Valve completed Note that both narrow and wide tube service valves on the outdoor unit are kept closed at this stage 2 Using an adjustable wrench or box wrench remove the valve caps from the service valve on both narrow and wide tubes 3 Connect a vacuum pump and a manifold valve with pressure gauges to the service port on the wide tube service valve Fig 20 Service port Screw diameter 1 2 Z TL MOLL Y Cap nut tightening torque 60 95 Ibs in 70 110 kgf cm Tighten by hand then use a wrench to turn approximately 30 lt Structure of service valve on wide tube side gt Before using the vacuum pump SAUTION adapter read the vacuum pump adapter manual and use the External diameter of service port R410A 5 16 adapter correctly Fia 21 ig When using a hex wrench to open the spindle extremely small amount of refrigerant may leak This does not indicate a problem CAUTION Be sure to use a manifold valve for air purging If it is not available use a stop valve for this purpose
85. ing connector Terminal plate prodi Wire Fig 30 9 32 7 mm ACTUAL STRIP Sze 4 Fig 26 E Solid wire Loop e co gt E Insulation Fig 27 m Stranded wire E O Ring connector lt a L D Screw and special washer N Ring connector TEX 5 5 Wiring Instructions for the Outdoor Unit Be sure to correctly align inter unit cables A B C and D Outdoor unit Terminal board Power supply conduit Power Single phase ne 60HZ gt Power breaker E not provided Ground Power cable w provided Inter Unit 12 Less than 85 ft Inter Unit A is the indoor unit with refrigerant tubing that is connected to service valve D top of the outdoor unit refrigerant tubing that is connected to service valve A bottom of the outdoor unit conduit conduit Indoor unit A Indoor unit D i i it wi D is the indoor unit with 125 Label D Terminal board Terminal board Indoor unit B Inter unit cables Inter unit cables Indoor unit C is the indoor unit with 14 not provided 14 not provided is the indoor unit with refrigerant tubing that i is refrigerant tubing that is dl eb Inter unit cables Inter unit cables 123 to senice a llo 14 not provided
86. ional refrigerant R410A by 0 22 oz ft No additional charge of compressor oil is necessary For more detailed charging information refer to the Technical amp Service Manual 2 2 Connecting Indoor Units Figures 4a 4k show the different types of indoor unit connections including the use of a reducer To select the required indoor unit to be connected refer to the Combination Table that was included in the outdoor unit package 1 Connecting indoor unit for CU 3KS19NBU A Outdoor unit Indoor unit 3 8 9 52mm CS MKS7NKU CS MKS9NKU CS MKS12NKU CS MKS9NBAU CS MKS12NBAU 3 8 9 52mm 1 4 6 35mm 3 8 9 52mm B 3 8 9 52mm CS MKS7NKU CS MKS9NKU CS MKS12NKU CS MKS9NB4U CS MKS12NB4U 1 4 6 35mm 3 8 9 52mm A 3 8 9 52mm CS MKS7NKU CS MKS9NKU CS MKS12NKU CS MKS9NB4U CS MKS12NB4U 1 4 6 35mm Fig 4a B Outdoor unit 3 8 9 52mm Indoor unit 9 52mm aM CS MKS7NKU CS MKS9NKU CS MKS12NKU A CS MKS9NB4U CS MKS12NB4U 3 9 52mm 1 4 6 35mm 9 mE CS MKS7NKU CS MKS9NKU CS MKS12NKU CS MKS9NB4U CS MKS12NB4U 3 8 9 52mm 1 4 6 35mm 112912 Z mm Ala EE CS MKS18NKU 3 8 9 52mm CS KS18NB4UW 1 4 6 35mm Flare 3 8 9 52mm Union 1 2 12 70mm AAA A joint for connecting tubes of different sizes 3 8 9 52mm 1 2 12 70mm Supplied Reducer Fig 4b 2 Connecting indoor un
87. ist for the corresponding unit and perform the work with the appropriate tools Incorrect or poor repair work may cause an electric shock or fire Never modify the unit Doing so may cause an electric shock or fire Perform all electric work according to local applicable regulations related to electrical equipment or interior wiring regulation and make sure to use the exclusive circuit Insufficient capacity to the electric circuit or defective arrangement results may cause an electric shock or fire Make sure to replace any power cable or lead wire showing any signs of scratch or deterioration Failure to do so may cause an electric shock overheating or fire Make sure that there is no dust on or slack in the power plug and insert fully into the socket Dust or incomplete connections may cause an electric shock or fire Do not damage or process the power cord as it may cause an electric shock or fire For the wiring between the indoor unit and outdoor unit securely fix the specified cable onto the terminal plate Poorly fixed wiring may cause a heat or fire After connecting the wiring between the indoor unit and outdoor unit attach the terminal cover securely Incomplete attachment of the terminal cover may cause overheating or fire Prohibit Prohibit Prohibit Prohibit Prohibit elejere iep If refrigerant gas blows off during the work do not touch the refrigerant gas as it may cause frostbite S Prohibit If refri
88. it for CU 4KS24NBU A 1 2 12 70mm 3 8 9 52mm Supplied Reducer Flare 1 2 12 70mm Union 3 8 9 52 Outdoor unit Indoor unit 3 8 9 52mm D g HE UN CS MKS7NKU CS MKS9NKU CS MKS12NKU S 3 8 9 52mm C UN CS MKS7NKU CS MKS9NKU CS MKS12NKU CS MKS9NB4U CS MKS12NB4 3 8 9 52mm B EN CS MKS7NKU CS MKS9NKU CS MKS12NKU CS MKS9NB4U CS MKS12NB4 3 8 9 52mm 14 6 35mm U CS MKS U 3 8 9 52mm als EN CS MKS7NKU CS MKS9NKU CS MKS12NKU E s s CS MKS9NB4U CS MKS12NB4 3 8 9 52mm i 1 4 6 35mm 59 U CS S U Fig 4c Outdoor unit Indoor unit 1 2 12 70mm D CS MKS18NKU 1 2 12 70mm ee AS CS KS18NB4UW Samm 3 8 9 52mm els mE CS MKS7NKU CS MKS9NKU CS MKS12NKU MKS9N CS 3 8 9 52mm 0 VA 635m CS S9NB4U CS MKS12NB4U 3 8 9 52mm mE CS MKS7NKU CS MKS9NKU CS MKS12NKU MK CS A ian CS MKS9NB4U CS MKS12NB4U 3 8 9 52mm Alt UN CS MKS7NKU CS MKS9NKU CS MKS12NKU gt j 3 8 9 52mm 0 VA 635m CS MKS9NB4U CS MKS12NB4U Fig 4d C 1 2 12 70mm gt 5 8 15 88mm Locally purchased c ct Flare 1 2 12 70mm Union 5 8 15 88mm Outdoor unit Indoor unit 5 8 15 88mm ELS Ig CS MKS24NKU 1 270 2 70mm __ _ 1 4 6 35mm 3 8 9 52mm C CS MKS7NKU CS MKS9NKU CS MKS12NKU MKS9NB4U CS Em UMP CS MKS9NB4U CS
89. its Never use new refrigerant R410A for existing units which use R22 This will cause the air conditioner to operate improperly and may result in a hazardous condition 9 8 2 Use of Existing Tubing e lf replacing an older unit that used refrigerant R22 with a R410A unit do not use its existing tubing Instead completely new tubing must be used 85 APPENDIX INSTALLATION INSTRUCTIONS CU 3KS19NBU CU 4KS24NBU CU 4KS31NBU 852 6 4190 581 00 1 1 INSTALLATION INSTRUCTIONS Split System Air Conditioner This air conditioner uses the refrigerant R410A External diameter of service port R410A 5 16 Model Combinations Combine indoor and outdoor units only as listed below Model No Indoor Unit Outdoor Unit CS MKS7NKU CU 3KS19NBU CS MKS9NKU CU 4KS24NBU CS MKS12NKU CU 4KS31NBU CS MKS18NKU CS MKS24NKU CS MKS9NB4U CS MKS12NB4U CS KS18NB4UW Power Source 60 Hz single phase 230 208 VAC Combination example Indoor unit B Indoor unit C Outdoor unit Indoor unit D 85264190581001 2011 Panasonic Contents Page IMPORTANT Please Read Before Starting 2 1 GENERAL 4 1 1 Tools Required for Installation not supplied 1 2 Accessories Supplied with Unit 1 3 Optional Copper Tubing Kit 1 4 Type of Copper Tube and Insulation Material 1 5 Additional Materials Required for Installation
90. ke sure to ground the unit Failure to do so may cause an electric shock Confirm that the component attachment position wiring condition soldering condition and connector connection are normal If not it may cause overheating or fire Confirm that the temperature around the compressor is not too high and then perform the repair work Failure to do so may cause a burn Perform welding work in a place with good ventilation If the work is performed in a poorly ventilated area it might cause a lack of oxygen If the installation plate or attachment frame has deteriorated due to corrosion etc replace it Failure to do so may cause an injury due to the unit falling When the cleaning is to be performed make sure to turn off the power and pull out the plug Touching the fan that is rotating at high speed may result in an injury When the indoor unit is to be removed do not place it on an incline S Doing so may cause wet furniture because water left inside may trickle down Prohibit Do not hold the sharp end of the unit or the aluminum fins as it may cause an injury to your hand or finger S Prohibit After repairs make sure to measure the insulation resistance and confirm that the value is 1 Mohm or more Any insulation error may cause an electric shock After repairs make sure to check the drainage of the indoor unit Inappropriate drainage may cause wet furniture and floors due to water leakage Table of Contents
91. lbs kg 138 9 63 0 E Shipping Ibs kg a 13 41 0 38 DATA SUBJECT TO CHANGE WITHOUT NOTICE Remarks 1 The values shown in performance section and electrical rating section above are based on the following unit combination For other combination unit please refer to the Unit Combination Tables in this manual Indoor Unit CS MKS9NKU Outdoor Unit CU 3KS19NBU tunit 2 Rating conditions are Cooling Indoor airtemp 80 F DB 67 F WB Outdoor air temp 95 F DB 75 F WB 1 e Outdoor Unit CU 4KS24NBU Indoor Unit CS MKS7NKU CS MKS9NKU x 2 Duct Less Type Rated lt 230V gt Voltage Rating 230V Single Phase 60Hz Outdoor Unit Control Microprocessor Fan Speeds Auto Hi Me Lo Compressor DC Twin Rotary Inverter Refrigerant Amount charged at shipment lbs g R410A 6 17 2 800 Refrigerant Control Electric Expansion Valve Operation Sound High Cool Cooling 2 Total Capacity BTU h 24 200 9 800 to 25 400 kw 7 10 2 90 to 7 50 9 E Air Circulation High ft min m h e Ruming SCS E Power Factor 88 2 Outdoor Unit Microprocessor Put Hi Melo gt Q UJ Refrigerant Tubing Connections Flare Type Max allowable tubing length per unit ft m 82 25 Refrigerant Narrow tube inch mm 1 4 6 35 x 4 Tube Diameter Wide tube inch mm o Unit Dimensions inch 29 1 8 x 35 7 16 x 12 19 32 gt Height x Widt
92. ll to prevent rain and draft from entering Fig 19 4 Air Purging Service Air and moisture remaining in the refrigerant system have valve on narrow tube side undesirable effects as indicated below Therefore they must be purged completely Service valve on wide tube side pressure the system rises operating current rises cooling efficiency drops moisture in the air may freeze and block capillary tubing water may lead to corrosion of parts in the refrigerant system Insulated tubes Fig 18 Apply putty here Tubing Fig 19 Manifold gauge special for R410A Low pressure High pressure valve valve 26 adapter A VS Leave the for preventing reverse flow valve open special for Hex wrench Charging hose With push pin special for R410A m Air Purging with a Vacuum Pump for Test Run e order to protect the earth s environment be sure to use a vacuum pump to perform the air purge Never perform an air purge by using the refrigerant gas cylinder or other external gas or by using the gas inside the outdoor unit 19 Fig 20 In order to prevent charging errors with the air conditioner that uses R410A the screw diameter at the service valve charging port has been changed When recharging or performing other servicing use the special charging hose and manifold gauge Stopper Cap tightening torque 170 215 lbs
93. n Table 3 and Fig 3a Air delivery from a ceiling mounted cassette unit will be degraded if the distance INDOOR Tubing length L1 from the floor to the ceiling Indoor unit UNIT 1 is greater than 10 ft 3 m INDOOR UNIT 2 For stable operation of the Elevation L2 air conditioner do not install difference H1 OUTDOOR Minimum height UNIT gt L3 H2 i wall mounted units less from floor level than 5 1 5 m from floor 5 1 5 m Fig 3a Fig 3b a level Fig 3b Floor level install the indoor unit more than 3 3 1 away from antenna or power lines or connecting wires used for tele vision radio telephone security system or intercom Electrical noise from any of these sources may affect operation install in sturdy manner to avoid increased operating noise Table 3 Max Max Allowable Total Limit of Limit of Elevation Required Amount Allowable Tubing Length Total Tubing Length Difference of Additional Model Tubing Length at Shipment L1 L2 L3 or H1 H2 H3 H4 Refrigerant Per Unit L1 L2 L3 or L1 L2 L3 L4 ft oz ft ft L1 L2 L3 L4 ft ft CU 3KS19NBU 82 150 L1 L2 L3 150 L1 L2 L3 50 CU 4KS24NBU 150 L1 L2 L3 L4 200 L1 L2 L3 L4 50 0 22 CU 4KS31NBU 150 L1 L2 L3 L4 230 L1 L2 L3 L4 50 0 22 If total tubing length becomes 150 to 200 ft Max or 150 to 230 ft Max charge addit
94. nges between Low Operates to effectively dehumidify the air while and LL very low over a 6 minute cycle not excessively reducing the indoor This is 1 f fluctuation fan operation temperature Refer to Fig 1 The indoor unit operates at 1 f fluctuation fan operation at a fan speed that does not cause a Chilly feeling The room temperature is DRY B operation 59 F or higher and is slightly too cold 1 The indoor fan changes between Low The compressor operates on a 3 minutes ON and LL very low over a 6 minute cycle 6 minutes OFF cycle to prevent the room This is 1 f fluctuation fan operation temperature from dropping too much V 2 After appoximately 3 minutes the compressor turns OFF the outdoor fan turns OFF and the indoor fan turns OFF 3 After approximately 6 minutes the conditions return to 1 The room temperature Monitoring operation begins When monitoring operation begins the below 59 F compressor stops and the indoor fan operates at LL very low speed 1 f fluctuation fan 250 200 150 Step 100 ns ee ae E 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 r 1 1 1 1 1 1 1 1 1 r 1 1 1 1 1 1 1 1 RS ee A as ls a L AA AA A A A AA ee A pasayan A A A s nn jm ee ee
95. ning system Please read over the entire set of instruc tions for the indoor and outdoor units and make sure all accessory parts listed are with the system before beginning If the electric wiring diagram does not appear in this manual please check for the diagram on the indoor unit 1 1 Tools Required for Installation not supplied 1 Standard screwdriver 7 Hacksaw 13 Torque wrench 2 Phillips head screwdriver 8 Core bits 14 Adjustable wrench 3 Knife or wire stripper 9 Hammer 15 Reamer for deburring 4 Tape measure 10 Drill 16 Vacuum pump For R410A 5 Carpenter s level 11 Tube cutter 17 Manifold valve 6 Sabre saw or key hole saw 12 Tube flaring tool 1 2 Accessories Supplied with Unit 1 CU AKSSINBU EA Packed in the outdoor unit Labels for inter unit cable and tube Reducer mm em id CU Reducer 3 8 x 1 2 1 3 Optional Copper Tubing Kit 2 Foamed polyethylene insulation for the specified copper tubes as required to precise length of tubing Wall thickness of the insulation should be not less than 5 16 8 mm Copper tubing for connecting the outdoor unit to the indoor unit is available in kits which contain the narrow and wide tubing fittings and insulation Consult your nearest sales outlet or air conditioning workshop 3 Use insulated copper wire for field wiring Wire size varies with the total length of wiring Hefer to 5 Wiring In
96. nt of or surrounding the air conditioner in a way that may block air flow ae s ES Drain hose AVOID Outside drainage e direct sunlight e nearby heat sources that may affect performance of the Fig 1 unit For wall mounted units O areas where leakage of flammable gas may be expected placing or allowing any obstructions near the air conditioner inlet or outlet 6 15 cm 2 2 5 cm min e installing in rooms that contain instant on rapid start fluorescent lamps These may prevent the air conditioner from receiving signals e places where large amounts of oil mist exist Front View e installing in locations where there are devices that Fig 2a generate high frequency emissions DO For ceiling mounted cassette units select an appropriate position from which every corner of the room can be uniformly air conditioned High on a wall is best for wall mounted types 22 m select a location that will hold the weight of the unit select a location where tubing and drain hose have the shortest run to the outside Fig 1 allow room for operation and maintenance as well as Fig 2b unrestricted air flow around the unit Fig 2a or 2b install the unit within the maximum elevation difference H1 H2 H3 H4 above or below the outdoor unit and CAUTION AUTION within a total tubing length L1 L2 L3 L1 L2 L3 L4 from the outdoor unit as detailed i
97. ntroller NOTE Replace the coil Use the special service magnet and Cool the main unit with Open and close the rotate 5 revolutions clockwise to fully a damp cloth or other electric expansion valve close the valve means while welding by hand to check it Then start the unit and measure the When applying temperature at the inlet and outlet vacuum use the tubes of the electric expansion valve If the temperature difference is large the valve is closed Then rotate 5 revolutions Replace the electric This part is normal counterclockwise to open the valve No temperature change Temperature changes special service magnet and rotate at least 5 revolutions counterclockwise to fully open the electric expansion valve expansion valve Check elsewhere Operation is normal if the temperature difference between the 2 tubes drops 1 If you have manually checked the electric expansion valve be sure to reapply the outdoor power after you have replaced the wiring The position of the elecric expansion valve will changed 76 7 Branch tubing temperature sensor Check that the sensor is securely contained in the thermostat holder 8 Breaker Check whether or not the breaker has been tripped Check that the breakers and fuses used are of the specified capacity Check that the breaker and its line are exclusive for A C use 9 Refrigerant gas pressure Start a COOL test run and messure the temperatures of the A C in
98. oling cycle Insulation N Thickness Min 5 16 8 mm Narrow tube Outdoor Unit CU 4KS31NBU Indoor unit Outdoor unit po Service valve on O D 3 8 Header x Electric Service valve on ae narrow tube vang Narrow tube DN u p A CN m ODIA gt lt CED gt O D 1 4 AN Y HD O D 1 4 lt 2S Sub x x Strainer Header High pressure Main accumulator accumulator Insulation of Refrigerant Tubing IMPORTANT Because capillary tubing is used in the outdoor unit both the wide and narrow tubes of this air conditioner become cold To prevent heat loss and wet floors due to dripping of condensation both tubes must be well insulated with a proper insulation material The thickness of the insulation should be a min 5 16 8 mm After a tube has been insulated never try to bend it into a narrow CAUTION curve because it can cause the tube to break or crack 26 Thickness Min 5 16 8 mm Wide tube S 9 JS O oe O a O gt lt 3 FE I lt Cooling cycle Insulation a Thickness Min 5 16 8 mm Narrow tube 5 PERFORMANCE DATA 5 1 Temperature Charts 5 1 1 Temperature Charts CU 3KS19NBU Outdoor Unit CU 3KS19NBU Indoor Unit CS MKS7NKU x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz
99. on the unit s nameplate When the entire amount cannot be charged all at once charge gradually while operating the unit in Cooling Operation CAUTION NEVET cnarge a large amount of liquid refrigerant at once to the unit This may cause damage to the compressor When charging with a refrigerant cylinder use an electronic scale for charging refrigerant In this case if the volume of refrigerant in the cylinder becomes less than 20 of the fully charged amount the composition of the refrigerant starts to change Thus do not use the refrigerant if the amount in the charging cylinder is less than 20 Also charge the minimum necessary amount to the charging cylinder before using it to charge the air conditioning unit Example In case of charging refrigerant to a unit requiring 1 68 Ib 0 76 Kg using a capacity of a 22 Ib 10 Kg cylinder the minimum necessary amount for the cylinder is 1 68 22 x 0 20 6 08 Ib 0 76 10 x 0 20 2 76 Kg For the remaining refrigerant refer to the instructions of the refrigerant manufacturer If using a charging cylinder transfer the specified amount of liquid refrigerant from the refrigerant cylinder to the charging cylinder Prepare an evacuated charging cylinder beforehand CAUTION To prevent the composition of R410A from changing never bleed the refrigerant gas into the atmosphere while transferring the refrigerant Fig 3 Do not use the refrigerant if th
100. or radio exists within 10 3 m 2 4 Baffle Plate for the Outdoor Unit It is recommended to use baffle plates When the outdoor unit is installed in a position exposed to strong wind such as seasonal winds with low air tempera ture in winter baffle plates must be installed on the outdoor unit Fig 5f This unit is designed so that the fan of the outdoor unit runs at low speed when the air conditioner is operated at low outdoor air temperatures When the outdoor unit is exposed to strong wind the system pressure drops because of the freeze protector Install a pair of windbaffle plates at the front and back of the outdoor unit if it will be subject to strong wind during the winter Figs 5f 5g 5h 5 and 5j 11 Outdoor unit 2 Exhaust fan a p i Heat source Obstacle above A Z Z 4B 2 1 Fig 5a 2 A lt Air intake i Min 8 20 cm Valve v 4 a side as Min 10 4 5 25cm A 4 10 discharge Min TEN cm ION Lo y 18 50 cm Ground Min 8 20 cm Air intake Drain holes Anchor bolts 4 pcs IN AN A AV z 22 NN NN W W p 222222252 2 ES EE E E EX Y 2253222222 Min 6 1 5 cm r Air intake Y
101. ork for an installation or re installation and while repairing refrigeration parts Handle liquid refrigerant carefully as it may cause frost bite When Servicing Turn the power OFF at the main power box mains before opening the unit to check or repair electrical parts and wiring Keep your fingers and clothing away from any moving parts Clean up the site after you finish remembering to check that no metal scraps or bits of wiring have been left inside the unit being serviced The illustrations are based on the typical appearance of a standard model Consequently the shape may differ from that of the air conditioner that you are installing Others Ventilate any enclosed areas when installing or testing the refrigeration system Escaped refrigerant gas on contact with fire or heat can produce dangerously toxic gas Confirm upon completing installation that no refrigerant gas is leaking If escaped gas comes in contact with a stove gas water heater electric room heater or other heat source it can produce dangerously toxic gas Do not install only a single indoor unit Do not touch the air inlet or the sharp aluminum fins of the outdoor unit You may get injured Do not sit or step on the unit you may fall down accidentally Do not stick any object into the FAN CASE You may be injured and the unit may be damaged 1 General This booklet briefly outlines where and how to install the air conditio
102. power before connecting or disconnecting the motor connectors B When performing voltage measurement at the outdoor controller connector for 3 in the table below the DC motor will trip and voltage output will stop approximately 10 seconds after operation is started For this reason to measure the voltage again first turn OFF the outdoor unit power then measure the voltage in Test Run mode Trouble symptom 1 The fan does not stop when the outdoor unit stops Outdoor unit controller trouble Trouble symptom 2 The fan motor does not rotate when the outdoor unit is operating Diagnostic procedure Disconnect the motor connectors and measure the voltage at the DC motor connectors on the outdoor unit controller 3 locations Measurement location 1 Vm Gnd Between pin 1 and pin 4 DC 230V or more 2 Vcc Gnd Between pin 5 and pin 4 DC 14V or more 3 Vsp Gnd Between pin 7 and pin 4 After fluctuating 4 times between DC 1 7 to 6 1V 1 sec ON and DC 0 V 1 sec OFF the DC motor trips Diagnostic results All of the above measured values are normal Fan motor trouble Replace the motor Any one of the above measured values is not normal Outdoor unit controller trouble Replace the controller Reference DC motor connector pin arrangement Pin 1 Vm red Pin 2 Not used Pin 3 Not used Pin 4 Gnd blue Pin 5 Vcc brown Pin 6 PG white Pin 7 Vsp orange Trouble symptom 3 Motor rotates for som
103. r air temperature F C 3 Indoor discharge air performance chart Indoor discharge air temperature F C 30 35 40 Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 46 Outdoor Unit CU 4KS31NBU Indoor Unit CS MKS9NB4U x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart oO L LIN ZUL L SE iin ater gt ge 1 2 Nr mu Y NCC A gt ee EMANAN P 146 g 1 0 NS E 118 0 8 o 90 0 6 77 86 95 104 25 30 35 40 Outdoor air temperature F C 2 Operating current performance chart Operating current A Outdoor air temperature F C 3 Indoor discharge air performance chart E sm 60 8 16 Indoor discharge air temperature F C 57 2 14 53 6 12 50 0 10 46 4 8 42 8 6 77 86 95 104 25
104. rformance is for a tubing length of 24 6t 7 5m If the tubing length is different the performance chart will vary 34 Outdoor Unit CU 4KS24NBU Indoor Unit CS MKS9NKU x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart CS EN NH DIT psig MPaG b Low pressure at wide tube service valve Outdoor air temperature F C 2 Operating current EN chart Dum 2 eo Operating current A Outdoor air temperature F C 3 Indoor discharge air performance chart Indoor discharge air temperature F al D 3 104 30 88 40 Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 35 Outdoor Unit CU 4KS24NBU Indoor Unit CS MKS12NKU x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart psig MPaG Low pressure at wide tube serv
105. rvice valve on wide tube side Outer diameter 1 2 12 70 Service valve on narrow tube side Outer diameter 1 4 6 35 5 2 3 4 2 15 16 N Service valve on wide tube side Outer diameter 3 8 9 52 Service valve on narrow tube side Outer diameter 1 4 6 35 Service valve on wide tube side Outer diameter 1 2 12 70 MMC 5 29 32 2 27 82 Y CN 4 di 9 N 2 1 32 4 1 2 Service valve on wide tube side Outer diameter 3 8 9 52 unit inch mm Ensure 6 15cm drain hose is to concrete or similar material 2 6 Diagram of Outdoor Unit Installation Never install only a single indoor unit Be sure to connect indoor and outdoor units only in combinations that are listed in the catalog or in the combination table that was provided with the outdoor unit Use caution Connecting any other model may result in operation failure and malfunction The dimensions indicated by lt in the figure below are spaces that are required in order to maintain performance Install in a location where the dimensions indicated by lt are ensured and where 2 or more
106. s been selected This applies in the case of automatic button on the remote with the remote controller operation begins in COOL operation controller is pressed SENSOR DRY or COOL mode depending on the room temperature and outdoor temperature at the time operation starts V Depending on the operational mode refer to the SENSOR DRY or COOL item 65 Control conditions Unit operation Explanation COOL The ON OFF operation The operation lamp illuminates The outdoor unit does not operate for 3 minutes button on the remote The indoor fan operates at the set fan speed even after the breaker is turned ON controller is pressed The outdoor unit stops The outdoor unit starts The frequency is increased at the rate of 0 5 Hz every 1 seconds Compressor and the outdoor fan start When the frequency reaches Hz This is in order to stabilize the return of oil to the frequency increases are stopped for a period compressor of B seconds Refer to Table 1 The frequency then increases If the indoor and outdoor temperatures are high the current peak cut off activates stopping any increases in frequency The room temperature The indoor temperature and the desired Operating frequency is stabilized in order to has reached the temperature are approximately equal maintain a comfortable environment desired temperature The thermostat turns The outdoor unit stops It does not stop if the OFF thermostart for
107. s caused to external or internal parts of the unit Particular care must be taken that drill chips do not drop into the unit 13 2 5 Outer Dimensions of Outdoor Unit 1 CU 3KS19NBU 23 15 16 5 11 32 gt gt Y NL ON r ES 3 Y 2 CU 4KS24NBU 23 15 16 5 11 32 N N N 3 CU 4KS31NBU 23 15 16 12 19 32 13 19 32 14 17 32 gt A 35 7 16 900 2 29 32 29 1 8 740 Fig 6a pa 35 7 16 900 23 32 1 13 16 2 1 16 2 29 32 Fig 6b A 35 7 16 900 4 f DUUUUUUUUU Fig 6c 14 2 27 32 5 29 32 2 3 4 TLL 2 27 32 29 327 1 2934 EEEEEEEHEEEEEEEEEE IH LL Service valve on narrow tube side Outer diameter 1 4 6 35 Service valve on wide tube side Outer diameter 3 8 9 52 st CN HEE EE 2 15 16 4 7 16 Se
108. structions for details CAUTION Check local electrical codes and regulations before obtaining wire Also check any specified instructions or 1 4 Type of Copper Tube and Insulation Material If you wish to purchase these materials separately from a local source you will need 1 Deoxidized annealed copper tube for refrigerant tub ing as detailed in Table 2 Cut each tube to the appropriate lengths 1 to 1 4 limitations 30 cm to 40 cm to dampen vibration between units Table 2 Narrow Tube Wide Tube Model Outer Dia Thickness Outer Dia Thickness CS MKS7NKU CS MKS9NKU CS MKS12NKU 1 4 6 35 mm 0 0314 0 8 mm 3 8 9 52 mm 0 0314 0 8 mm CS MKS18NKU 1 4 6 35 mm 0 0314 0 8 mm 1 2 12 70 mm 0 0314 0 8 mm CS MKS24NKU 1 4 6 35 mm 0 0314 0 8 mm 5 8 15 88 mm 0 0393 1 0 mm CS MKS9NBAU CS MKS12NB4U 1 4 6 35 mm 0 0314 0 8 mm 3 8 9 52 mm 0 0314 0 8 mm CS KS18NB4UW 1 4 6 35 mm 0 0314 0 8 mm 1 2 12 70 mm 0 0314 0 8 mm 1 5 Additional Materials Required for Installation 1 Refrigeration armored tape 2 Insulated staples or clamps for connecting wire See local codes 3 Putty 4 Refrigeration lubricant 5 Clamps or saddles to secure refrigerant tubing 2 Installation Site Selection Indoor unit 2 1 Indoor Unit To prevent abnormal heat generation WARNING and the possibility of fire do not place obstacles enclosures and grilles in fro
109. t the performance chart will vary 39 Outdoor Unit CU 4KS24NBU Indoor Unit CS MKS12NB4U x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart 2 7 Qe mo seo 2 160 Low pressure at wide tube service valve p Outdoor air temperature F C 2 Operating current performance chart Operating current A Outdoor air temperature F C 3 Indoor discharge air performance chart cR EEG E HHH O 64 4 18 Oo T D Indoor discharge air temperature F Outdoor air temperature F C NOTE e This performance chart shows operation of a single wall mounted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value in test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 40 Outdoor Unit CU AKS24NBU Indoor Unit CS KS18NBAUW x 1 Cooling Characteristics RH 46 Indoor fan speed High fan 230V 60Hz 1 Low pressure performance chart tm PE psig MPaG Low pressure at wide tube service valve 95 104 25 30 35 40 Outdoor
110. t Entering Air Temp 80 F 26 7 C DB 67 F 19 4 C WB Outdoor Ambient Temp 95 F 35 C DB 2 Above data does not take Freeze Prevention Protection during cooling operation into account For this reason the value may vary from the actual cooling characteristics 3 Above data represents the value when the operation frequency of a compressor is fixed 52 Outdoor Unit CU 4KS24NBU Indoor Unit CS KS18NB4UW CS MKS12NB4U CS MKS12NB4U Power Supply 230V Single Phase 60Hz lt Cooling Capacity gt RATING CAPACITY 24 800 BTU h AIR FLOW RATE 812 CFM INDOOR OUTDOOR ENT TEMP F C AMBIENT TEMP F WB 65 75 85 95 105 115 18 3 23 9 29 4 35 0 40 6 46 1 730 15 410 21 28 950 28 050 27 050 26 320 19 520 14 320 8 790 8 480 8 160 8 000 5 800 4 380 TC Total Cooling Capacity BTU h SHC Sensible Heat Capacity BTU h NOTE 1 Rating conditions Indoor Unit Entering Air Temp 80 F 26 7 DB 67 F 19 4 C WB Outdoor Ambient Temp 95 F 35 C DB 2 Above data does not take Freeze Prevention Protection during cooling operation into account For this reason the value may vary from the actual cooling characteristics 3 Above data represents the value when the operation frequency of a compressor is fixed 53 Outdoor Unit CU 4KS31NBU Indoor Unit CS MKS9NKU x 4 Power Supply 230V Single Phase 60Hz lt Cooling Capacity gt RATI
111. t the wire end with a cutting pliers then strip the insulation to expose the wire about 9 32 7 mm See the label Fig 26 near the terminal plate 2 Using a screwdriver loosen the terminal screw on the terminal plate 3 Insert the wire and tighten the terminal screw com pletely using a screwdriver b For Outdoor Unit For solid core wiring or F cable 1 Cut the wire end with a cutting pliers then strip the insulation to expose the solid wire about 15 16 25 mm Fig 27 2 Using a screwdriver remove the terminal screw s on the terminal plate 3 Using the pliers bend the solid wire to form a loop suitable for the terminal screw 4 Shape the loop wire properly place it on the termi nal plate and fix it securely with the removed termi nal screw using a screwdriver For stranded wiring 1 Cut the wire end with a cutting pliers then strip the insulation to expose the stranded wiring about 3 8 10 mm and tightly twist the wire ends Figs 28 and 29 2 Using a screwdriver remove the terminal screw s on the terminal plate 3 Using a ring connector fastener or pliers securely clamp each stripped wire end with a ring connector Fig 28 4 Place the ring connector wire and replace and tighten the removed terminal screw using a screw driver Fig 30 24 Special washer b Fig 28 Twist wire ends Bx Z Fig 29 Screw R
112. t use oxygen or any flammable gas 5 Evacuation Use a solenoid valve installed vacuum pump so that even if power is cut off in the middle of evacuation of air due to a power interruption the valve will prevent the pump oil from flowing back The equipment may be damaged if moisture remains in the tubing thus carry out the evacuation thoroughly When using a vacuum pump with exhaust air volume more than 0 883 cu ft min and ultimate vacuum pressure rate of 50 micron Hg Standard time for evacuation 1 Detect leaks OK 2 Recover refrigerant OK 3 Weld leaking points OK 4 Check for sealing OK 5 Evacuation OK 6 Recharge Length of tubing Less than 33 ft 10 m More than 33 ft 10 m More than 10 minutes More than 15 minutes 6 Recharging Recharge unit in the same manner explained on the previous page 5 Recharging 84 9 7 Charging Additional Refrigerant 9 7 1 When Tubes are Extended Observe the proper amount of refrigerant as stated in this service manual or the installation manual that came with the indoor unit Charge additional refrigerant in liquid state only N CAUTION Never charge additional refrigerant if refrigerant is leaking from the unit Follow instructions given in 9 6 In Case Refrigerant is Leaking and completely carry out repairs Only then should you recharge the refrigerant 9 8 Retro Fitting Existing Systems 9 8 1 Use of Existing Un
113. take air and discharge air Compare the values with the performance charts e If the values are higher than the performance charts Check for refrigerant shortage or blockage of the refrigerant circuit lt Assessment of refrigerant shortage gt 1 The pressure in the low pressure section is 5 MPa or more below the value in the performance charts 2 There is little condensation on the indoor heart exchanger which overall appears dry lt Distinguishing between refrigerant shortage and refrigerant circuit blockage gt If the pressure in the low pressure section does not change when the circuit is charged 2 to 3 times with refrigerant gas 0 44 lbs each time or if the change is small then the problem may not be refrigerant shortage The problem may be a blockage of the refrigerant circuit 1 Check that there is no internal leakage inside the 4 way valve At the low pressure side tubing check that there is no temperature difference between the intake and discharge of the 4 way valve 2 Check that the electric expansion valve is not blocked Check as described on the preceding page 77 8 5 Trouble Diagnosis of Fan Motor This outdoor DC fan motor contains an internal control PCB Therefore it is not possible to measure the coil resistance and the following procedure should be used to check the motor e Perform the trouble diagnosis by Test Run mode described on Installation Instructions of indoor unit Important A Turn OFF the
114. the figure below are established for frequency reduction and increase prohibit Current A Example of operation during cooling Trip Hz reduction Hz increase prohibit Hz reduction Hz increase prohibit 16 22425 OO eee DX AA Frequency Hz 7 2 2 Low Start Current Operation starts at 8 Hz and the start current is less than the normal operating current This prevents the flickering of fluorescent lights or television screens that occurs when ordinary A C units start 7 2 3 Compressor Temperature Control To protect the compressor coil from overheating the operating frequency is controlled based on the compressor discharge temperature F S 230 E 5Hz every 30 sec reduction 223 2Hz every 30 sec reduction o 5 212 9 Increase rohibit range No control i Hz reduction 194 Within the increase prohibit range the range changes to the Hz reduction range 2 Hz every 30 seconds if the compressor temperature rises by 4 F 70 8 TROUBLESHOOTING BEFORE CALLING FOR SERVICE 8 1 Precautions before Performing Inspection or Repair m Both the indoor unit and outdoor unit include electronic control circuits Be sure to pay attention to the following before inspecting or repairing the outdoor side electronic circuits High capacity electrolytic capacitors are used inside the outdoor unit controller inverter They retain an electric
115. unted indoor unit The performance chart will vary depending on the indoor unit type e Check each performance value in test run mode Electrical performance values represent a combined indoor outdoor value In this case be sure to stop all the indoor units where performance is not being checked The performance is for a tubing length of 24 6ft 7 5m If the tubing length is different the performance chart will vary 49 5 2 Cooling Capacity Outdoor Unit CU 3KS19NBU Indoor Unit CS MKS9NKU x Power Supply 230V Single Phase 60Hz lt Cooling Capacity gt RATING CAPACITY 18 800 BTU h AIR FLOW RATE 777 CFM INDOOR OUTDOOR ENT TEMP F C AMBIENT TEMP F WB 65 75 85 95 105 115 18 3 23 9 29 4 35 0 40 6 46 1 TG 0 0 22 470 21 780 21 020 20 570 19 650 18 620 6 580 6 430 6 280 6 130 5 830 5 530 TC Total Cooling Capacity BTU h SHC Sensible Heat Capacity BTU h NOTE 1 Rating conditions Indoor Unit Entering Air Temp 80 F 26 7 C DB 67 F 19 4 C WB Outdoor Ambient Temp 95 F 35 C DB 2 Above data does not take Freeze Prevention Protection during cooling operation into account For this reason the value may vary from the actual cooling characteristics 3 Above data represents the value when the operation frequency of a compressor is fixed 50 Outdoor Unit CU 3KS19NBU Indoor Unit CS MKS12NB4U x 3 Power Supply 230V Single Phase 60Hz
116. utdoor System d lali 74 8 4 Trouble Diagnosis of Each Part 78 8 5 Trouble Diagnosis of Fan Motor Page 9 REFRIGERANT R410A SPECIAL PRECAUTIONS WHEN SERVICING UNIT 9 1 Characteristics of New Refrigerant R410A 79 9 2 Checklist before Servicing secs pecs rd 80 9 3 Tools Specifically for R410A 81 9 4 Tubing Installation Procedures augu EE cie dies 81 9 5 In Case of Compressor Malfunction 82 9 6 In Case Refrigerant is Leaking ta tdi 84 9 7 Charging Additional Refrigerant cesar 85 9 8 Retro Fitting Existing SUSIONIS EEEN 85 INSTALLATION INSTRUCTIONS A 1 m APPLICABLE INDOOR UNITS e Wall Mounted Type CS MKS7NKU CS MKS9NKU CS MKS12NKU CS MKS18NKU CS MKS24NKU Multi Outdoor Unit e Semi Concealed Type Multi Outdoor Unit CZ 18BT1U CZ 18BT1U CZ 18BT1U YES cu 1 OPERATING RANGE Temperature Indoor Air Intake Temp Outdoor Air Intake Temp 67 F DB 57 F WB 14 FDB 2 SPECIFICATIONS 2 1 Unit Specifications Outdoor Unit CU 3KS19NBU Indoor Unit
117. vice from the dealer where the unit was purchased or from an appropriate agent Perform pump down as described below What is pump down Pump down refers to recovering the refrigerant gas from the refrig erant cycle at the outdoor unit This work must be performed dur ing cooling operation The refrigerant gas cannot be recovered during heating operation During winter or if the temperature sensor prevents cooling opera tion perform forced cooling operation Pump down procedure 1 Fully close the spindles at the valves on the narrow tube side of tubes A B C and D Refer to Fig 22 2 Connect the manifold gauge to the charging port at the valve on the wide tube side of tube D Purge the air from the charging hose Refer to Fig 23 3 Perform cooling operation or forced cooling operation When the pressure at the low pressure side is 0 05 0 1 MPaG 0 5 1 kg cm G fully close the spindles at the valves on the wide tube side of tubes A B C and D and immediately stop operation Refer to Fig 23 In the winter the outdoor unit may stop after 5 10 minutes of operation This is in order to protect the indoor unit heat exchanger from freezing and does not indicate a problem 4 Disconnect the manifold gauge and the inter unit tubes and attach the caps and flare nuts At this point pump down is pleted If the caps and flare nuts are not reattached there is the danger of gas leakage Ref
118. wiring Store excess wiring inside the cabinet 4 When connections are completed check that all con nections are correct as shown in the wiring system diagram on panel side 5 Be sure to ground the unit according to your local codes 6 Test Run Performing a test run Refer to the test run procedures in the indoor unit installation manual Perform the test run separately for each connected indoor unit If 2 units are operated simultaneously it is not possible to correctly check for errors in tubing and wiring Checking tubing and wiring Perform the test run and check that operation is normal If there is an error in tubing or wiring the refrigerant may flow to indoor unit B when indoor unit A is operated for example e Stop operation immediately if there is an error in tubing or wiring Turn the power breaker to OFF and check whether the inter unit cables are connected incorrectly or whether the narrow tubes A and B are connected in reverse Correct the connections e If there is an error in tubing pump down must be per formed Be sure to perform pump down After making corrections again purge the air from the tubes 26 Terminal block 1 Conduit plate 89 nter unit Power supply Conduit Conduit Plug Access panel Fig 32 Access panel C Conduit plate Make sure there is no gap between access pan

Panasonic CU-3KS19NBU Service Manual

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