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SERVICE MANUAL - mitsubishitech.co.uk

1. LEGEND SYMBOL NAME SYMBOL NAME square s indicates a switch IB INDOOR CONTROLLER BOARD TB4 TERMINAL BLOCK INDOOR OUTDOOR CONNECTING LINE i CN2L CONNECTOR LOSSNAY TB5 TB6 TERMINAL BLOCK REMOTE CONTROLLER lt Table 1 gt CN32 CONNECTOR REMOTE SWITCH TRANSMISSION LINE SW1 MODEL SELECTION CN41 CONNECTOR HA TERMINAL A THI ROOM TEMP THERMISTOR SWi CN51 CONNECTOR CENTRALLY CONTROL 0 15kQ 25 C 5 DETECT Service FUSE FUSE T6 3AL250V TH2 PIPE TEMP THERMISTOR LIQUID 12345 LEDI POWER SUPPLY I B 0 15 25 C 5 4kQ DETECT mah PIRS LED2 POWER SUPPLY R B TH5 COND EVA TEMP THERMISTOR LED3 TRANSMISSION INDOOR OUTDOOR 0 15kQ 25 C 5 4 DETECT lt Table 2 gt SW2 CAPACITY CODE swi SWITCH MODEL SELECTION XSee table 1 OPTION PARTS Swe SW2 SWITCH CAPACITY CODE table 2 W B PCB FOR WIRELESS REMOTE CONTROLLER MODELS Service MODELS Service SWE CONNECTOR EMERGENCY OPERATION BZ BUZZER 12345 12345 xi RELAY DRAIN PUMP LED1 LED OPERATION INDICATION GREEN PCA RPSSKAQ ENNIO WIRED REMOTE CONTROLLE
2. 90 1 1 5 d a e 5 2 70 79 8 60 E w EI w 5 eo eo a 2 40 gt o o a z 8 amp 30 gt 5 C T TE 20 ENG HEARING FOR een x CONTINUOUS NOISE t t 10 L t t t 4 63 125 250 500 1000 2000 4000 8000 OCH491B BAND CENTER FREQUENCIES Hz 13 PCA RP50KAQ PCA RP50KAQR1 NOTCH SPL dB LINE High 40 Medium1 37 Medium2 34 oe Low 32 2 4 90 80 2 a 8 8 70 a a 8 60 gt a lt 50 40 o 2 a 30 amp o 8 1 20 APPROXIMATE T T THRESHOLD OF 1277 HEARINGFOR CONTINUOUS NOISE 10 63 125 250 500 BAND CENTER FREQUENCIES Hz PCA RP71KAQ PCA RP71KAQR1 1000 2000 4000 8000 NOTCH LINE High 41 0 Medium1 39 A Medium2 37 oe Low 35 4 90 ar 1 _ 80 1 8 T i 1 t 8 F E FN mL 5 Se So NEN A NC 70 m NNI ME F T E
3. TIME SUN MON TUE WED THU FRI SAT TMER ILI AFTER _ gt CULT AFTER Timer indicators FUNEHON The indicator comes on if the corre Em 1 sponding timer is set Centrally Controlled indicator E3 F EX Tl WEEKLY Indicates that operation from the Ll 38 1 UTC OEE remote controller has been prohib ited by a master controller Fan Speed indicator Shows the selected fan speed ee Air Direction indica Room Temperature Ventilation indicator or ows the room temperature The room SET FERE Ti i indi Appears when the unit is running in Timer i 0ff indicator The indicator shows the direc temperature display range is 8 39 C ortiation mode Indicates that the timer is off tion of the outcoming airflow The display blinks if the temperature is less than 8 C 39 C more One Hour Only indicator Displays if the airflow is set to Lo ver display 5 low downward during COOL Indicates the action of the swing louver Temperature Setting E or DRY mode Operation varies Does not appear if the louver is not Shows the target temperature according to model running The indicator goes off in 1 hour when the airflow direction Power On indicator also changes Indicates that the power is on
4. PCA RP100 125 140KAQ 98 8191 oxelui YSZ n 97 089 yenno 78 7 961 062 66 92011 193205 ure1q 0sseoov 920 2 10 ejou 3noyo0UuM 220 2 10 jnoyoouy 0019 ayejul 4594 10 9jou jnoxoouy edid urejp ajoy jnoyoouy uonoeuuoo peje j epis edid uonoeuuoo peje j epis edid se6 uonoeuuoo edid jue1eDujey Buidid urejp 49 10 jnoyoOUY ya eui 10jjuonoeuuoo edid q juuge uonoeuuoo edid eBeureiq si 1500s uieip ueuM 1291091 8 0091 089 gt 026 81 051 youd 104 uolsuadsns 661 snp jo
5. 2 Airflow rate m3 min OCH491B Curve inthe site 0 12 ais pe Q Designed amount of fresh air intake lt 3 gt Static pressure loss of fresh air intake duct system with airflow amount Q lt Pa gt Forced static pressure at air conditioner inlet with airflow amount Q lt Pa gt Static pressure of booster fan with airflow amount Q Pa Static pressure loss increase amount of fresh air intake duct system for airflow amount Q Pa Static pressure of indoor unit with airflow amount Q Pa Qa Estimated amount of fresh air intake without D lt 3 gt 6 NOISE CRITERION CURVES PCA RP35KAQ NOTCH SPL dB LINE High 39 9 0 Medium1 36 Medium2 33 oe Low 31 2 4 90 _ 80 ES N 8 8 70 a 8 60 m gt 4 w amp 50 8 2 40 2 o no 2 a a 30 gt o EE L 20 TiRESHOLD oF HEARING FOR x CONTINUOUS NOISE 10 3 2 63 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES Hz PCA RP60KAQ NOTCH SPL dB LINE PCA RP60KAQR1 Medium1 37 Medium2 35 o e Low 33 2 4
6. Operation Section ON OFF button Fan Speed button Temperature setting buttons Down CA Up Timer Menu button Monitor Set button a MITSUBISHI ELECTRIC Filter 41 button lt Enter gt button E TEMP Test Run button Set Time buttons Cv CA r 4 Check button Clear button Mode button Return button Back CMMOG63 MENU FILTER C 2a Ahead BACK MONTORSET DAY CHEK TEST Airflow Up Down button Timer On Off button PAR 21MAA CLOCK V OPERATION A 9 h Set Day button Louver button Operation button To return operation Opening the number cover Ventilation button A Operation button CA To go to next operation number Built in temperature sensor OCH491B 8 5 SPECIFICATIONS 5 1 SPECIFICATIONS Service Ref PCA RP35KAQ Mode Cooling Heating Power supply phase cycle voltage Single phase 50Hz 230V Input 0 04 0 04 Running current 0 29 0 27 External finish Munsell 6 4Y 8 9 0 4 Heat exchanger Plate fin coil Fan Fan drive x No Sirocco fan direct x 2 Fan motor output kW 0 090 Airflow Low Medium2 Me
7. Do not use refrigerant other than R410A Ventilate the room if refrigerant leaks during operation If refrigerant comes into contact with a flame poisonous gases will be released If other refrigerant R22 etc is used chlorine in refrige rant can cause deterioration of refrigerant oil etc OCH491B 3 1 Cautions for service 1 Perform service after recovering the refrigerant left in unit completely 2 Do not release refrigerant in the air 3 After completing service charge the cycle with specified amount of refrigerant 4 When performing service install a filter drier simultaneously Be sure to use a filter drier for new refrigerant 2 Additional refrigerant charge When charging directly from cylinder Check that cylinder for R410A on the market is syphon type Charging should be performed with the cylinder of syphon stood vertically Refrigerant is charged from liquid phase 3 Service tools Use the below service tools as exclusive tools for R410A refrigerant No Tool name Specifications Gauge manifold Only for R410A Use the existing fitting specifications UNF1 2 Use high tension side pressure of 5 3MPa G or over Charge hose Only for R410A Use pressure performance of 5 09MPa G or over 9 Electronic scale a Gas leak detector Use the detector for R134a R407C or R410A Adaptor for reverse flow check Att
8. 4 t F F 5 60 I d J d I 1 gt a 50 o o w a 2 40 gt o amp a 30 gt E 1 45 3 20 APPROXIMATE THRESHOLD OF uso 1 HEARING FOR CONTINUOUS 4 NOISE i 1 10 T 28 63 125 250 500 BAND CENTER FREQUENCIES Hz 1000 2000 4000 8000 PCA RP100KAQ NOTCH SPL dB LINE High 43 Mediumi 41 Medium2 39 o e Low 37 0 0002 ubar OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB PCA RP140KAQ NOTCH 0 0002 ubar OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 90 80 70 60 50 40 30 20 90 80 70 60 50 40 30 20 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 63 125 250 500 1000 2000 BAND CENTER FREQUENCIES Hz 4000 8000 SPL dB LINE High 48 0 0 Mediumi 45 4 4 Medium2 43 e e Low 41 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 7 20 T T 63 125 250 500 1000 2000 BAND CENTER FREQUENCIES Hz OCH491B 4000 8000 PCA RP125KA
9. 10 1 TROUBLESHOOTING lt Error code display by self diagnosis and actions to be taken for service gt Present and past error codes are logged and displayed on the wired remote controller or controller board of outdoor unit Actions to be taken for service and the trouble reoccurrence at field are summarized in the table below Check the contents below before investigating details Unit conditions at service Error code Actions to be taken for service Summary Displayed The trouble is reoccurring Judge what is wrong and take a corrective action according to 10 3 Self diagnosis action table Not displayed Conduct troubleshooting and ascertain the cause of the trouble according to 10 4 Troubleshooting of problems The trouble is not reoccurring Consider the temporary defects such as the work of protection devices in the refrigerant circuit including compressor poor connection of wiring noise and etc Re check the symptom and check the installation environment refrigerant amount weather when the trouble occurred matters related to wiring and etc Reset error code logs and restart the unit after finishing service GThere is no abnormality in electrical component controller board remote controller and etc Not logged OCH491B 21 Re check the abnormal symptom Conduct trouble shooting and ascertain the cause of the trouble according to 10 4 Troublesho
10. Contact failure of connector CN44 on the indoor controller board Insert failure 9 Breaking of wire or contact failure of thermistor wiring Temperature of thermistor is 90 C or more or 40 or less caused by defective refrigerant circuit Defective indoor controller board Check resistance value of thermistor For characteristics refer to P1 above Check contact failure of connector CN44 on the indoor controller board Refer to 10 7 Turn the power on and check restart after inserting connector again Operate in test run mode and check pipe lt condenser evaporator gt temperature with outdoor controller circuit board If pipe lt condenser evaporator gt temperature is extremely low in cooling mode or high in heating mode refrigerant circuit may have defect Operate in test run mode and check pipe lt condenser evaporator gt temperature with outdoor control circuit board If there is extreme difference with actual pipe lt condenser evaporator gt temperature replace indoor controller board There is no abnormality if none of above comes within the unit Turn the power off and on again to operate In case of checking pipe temperature with outdoor controller circuit board be sure to connect A control service tool PAC SK52ST Remote controller transmission error E0 signal receiving error E4 Abnormal if main or sub remote con troller cannot receive any transmission n
11. Heat exchanger Plate fin coil Fan Fan drive x No Sirocco fan direct x 3 Fan motor output kW 0 095 Airflow Low Medium2 Mediumt High m min CFM 15 16 17 19 530 565 600 670 External static pressure Pa mmAq O direct blow INDOOR UNIT Operation control amp Thermostat Remote controller amp built in Noise level Low Medium2 Medium1 High 33 35 37 40 Field drain pipe O D 26 1 Dimensions 1 280 50 3 8 680 26 3 4 230 9 1 16 Weight OCH491B INDOOR UNIT 2 5 cc Q a 2 INDOOR UNIT Service Ref PCA RP71KAQ PCA RP71KAQR1 Mode Cooling Heating Power supply phase cycle voltage Single phase 50Hz 230V Input 0 06 0 06 Running current 0 42 0 42 External finish Munsell 6 4Y 8 9 0 4 Heat exchanger Plate fin coil Fan Fan drive x No Sirocco fan direct x 3 Fan motor output kW 0 095 Airflow Low Medium2 Medium1 High me min CFM 16 17 18 20 565 600 635 705 External static pressure Pa mmAq O direct blow Operation control amp Thermostat Remote controller amp built in Noise level Low Medium2 Medium1 High 35 37 39 41 Field drain pipe O D 26 1 Dimensions 1 280 50 3 8 680 26 3 4 230 9 1 16 Weight Service Ref 32 71 PCA RP100KAQ
12. Mode Cooling Heating Power supply phase cycle voltage Single phase 50Hz 230V Input 0 09 0 09 Running current 0 65 0 65 External finish Munsell 6 4Y 8 9 0 4 Heat exchanger Plate fin coil Fan Fan drive x No Sirocco fan direct x 4 Fan motor output kW 0 160 Airflow Low Medium2 Medium1 High m min CFM 22 24 26 28 775 850 920 990 External static pressure Pa mmAq O direct blow Operation control amp Thermostat Remote controller amp built in Noise level Low Medium2 Medium1 High 37 39 41 43 Field drain pipe O D 26 1 Dimensions 1 600 63 680 26 3 4 230 9 1 16 Weight Service Ref 36 79 PCA RP125KAQ Mode Cooling Heating Power supply phase cycle voltage Single phase 50Hz 230V Input 0 11 0 11 Running current 0 76 0 76 External finish Munsell 6 4Y 8 9 0 4 Heat exchanger Plate fin coil Fan Fan drive x No Sirocco fan direct x 4 Fan motor output kW 0 160 Airflow Low Medium2 Medium1 High 23 25 27 29 810 885 955 1025 External static pressure Pa mmAq O direct blow Operation control amp Thermostat Remote controller amp built in Noise level Low Medium2 Medium1 High 39 41 43 45 Field drain pipe O D 26 1 Dimensions 1 600 63
13. 1 1 8 2 Indoor and outdoor connecting wires are made with polarities BLK TB2 make wiring matching terminal numbers S1 S2 S3 5 5 YLW YLW RED POWER SUPPLY 3 Since the outdoor side electric wiring may change be sure to ale ORN BU INJ 1PHASE check the outdoor unit electric wiring for servicing 1 GRNYLW em _ _ 230V 50Hz 4 This diagram shows the wiring of indoor and outdoor connecting D wires specification of 230V adopting superimposed system YLW of power and signal mS 1 When work to Supply power separately to indoor and BRN 163 TO OUTDOOR UNIT outdoor units was applied refer to Fig 1 Teas 2 For power supply system of this unit refer to the caution 1 3 INDOOR OUTDOOR CN3C COMMUNICATION label located near this diagram OCH491B 19 BLU 9 REFRIGERANT SYSTEM DIAGRAM PCA RP60KAQ PCA RP140KAQ PCA RP71KAQR1 PCA RP35KAQ PCA RP50KAQ PCA RP100KAQ PCA RP125KAQ PCA RP50KAQR1 PCA RP60KAQR1 Strainer 50 Heat exchanger Condenser evaporator temperature thermistor 5 Refrigerant GAS pipe connection Flare PCA RP71KAQ Refrigerant flow in cooling Refrigerant flow in heating Refrigerant LIQUID pipe connection Flare oO Pipe temperature Room temperature thermistor liquid thermistor TH1 Distributor with strainer 1 2 50 50 OCH491B 20 10 TROUBLESHOOTING
14. 5 Remove the screw from the guide vane then remove the guide vane Drain pan Guide vane 12 Removing the Auto vane Photo 21 1 Remove the intake grille See Figure 1 2 2 Remove the right side panel See Figure 3 4 Vane sleeve Vane support Vane 3 Remove the vane motor and cover See Photo 13 Vane motor side 4 5 Slide the auto vane to the vane motor side Remove 2 axes from each vane support pushing the vane support to the vane sleeve side OCH491B 45 OPERATING PROCEDURE PHOTOS amp ILLUSTRATIONS 13 Removing the heat exchanger 1 Remove the air intake grille See Figure 1 2 2 Remove the beam See Photo 1 3 Remove the electrical cover See Photo 1 4 Pull the electrical box downward See Photo 2 5 6 Remove the under panel See Photo 14 7 Remove the drain pan See Photo 15 16 17 8 Remove the pipe cover See Photo 18 holder See Photo 19 10 Remove the pipe band fixing screw and remove the pipe band See Photo 22 11 Remove 2 screws from the heat exchanger and remove the heat exchanger Remove the left and right side panels See Figure 3 9 Remove the pipe thermistors TH2 and 5 from each Photo 22 exchanger gt gt Pipe band Pipe band fixing screw Photo 23 Heat exchanger fixing screws Heat exchanger Vane MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE
15. 680 26 3 4 230 9 1 16 Weight OCH491B 38 84 10 2 5 Q Q a 2 Service Ref PCA RP140KAQ Mode Cooling Heating Power supply phase cycle voltage Single phase 50Hz 230V Input 0 14 0 14 Running current 0 90 0 90 External finish Munsell 6 4Y 8 9 0 4 Heat exchanger Plate fin coil Fan Fan drive x No Sirocco fan direct x 4 Fan motor output kW 0 160 Airflow Low Medium2 Mediumt High m min CFM 24 26 29 32 850 920 1025 1130 External static pressure O direct blow Operation control amp Thermostat Remote controller amp built in Noise level Low Medium2 Medium1 High 41 43 45 48 Field drain pipe O D 26 1 Dimensions 1 600 63 680 26 3 4 230 9 1 16 Weight OCH491B 11 5 2 FRESH AIR INTAKE AMOUNT amp STATIC PRESSURE CHARACTERISTICS Static pressure Pa Static pressure Pa PCA RP35 50KAQ PCA RP50KAQR1 50 0 50 100 150 200 250 300 PCA RP100 125 140KAQ 50 0 50 100 150 200 250 300 2 Airflow rate m3 min PCA RP60 71KAQ PCA RP60 71KAQR1 50 0 50 100 150 200 Static pressure Pa 250 300 4 2 3 4 Airflow rate m3 min How to read curves Duct characteristics
16. DISASSEMBLY PROCEDURE PCA RP35KAQ PCA RP50KAQ PCA RP60KAQ PCA RP71KAQ PCA RP100KAQ PCA RP125KAQ PCA RP140KAQ PCA RP50KAQR1 PCA RP60KAQR1 PCA RP71KAQR1 OPERATING PROCEDURE Be careful when removing heavy parts Photo PCA RP125KAQ PHOTOS amp ILLUSTRATIONS 1 Removing the air intake grille 1 Slide the air intake grille holding knobs at 2 or 3 loca tions to the rear to open the air intake grille See Figure 1 2 While the air intake grille left open push the stoppers on the rear hinges at 2 or 3 locations to pull out the air intake grille See Figure 2 Figure 2 hinges L S2 Pull out the air intake grille Figure 1 Air intake grille holding knobs 2 Removing the indoor controller board and the electrical box 1 Remove the air intake grille See Figure 1 2 2 Remove the beam by removing screws See Photo 1 3 Remove 2 screws from the electrical cover and remove the electrical cover 4 Remove 2 screws from the electrical box and pull the electrical box downward Temporarily secure the electrical box using 2 hooks in the back of electrical box 5 Disconnect the connectors on the indoor controller board Removing the electrical box 6 Disconnect the wires from the terminal blocks and pull out the electrical box See Photo 2 Removing the indo
17. TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2010 MITSUBISHI ELECTRIC CORPORATION Distributed in Oct 2012 No OCH491 REVISED EDITION B Distributed in Feb 2012 No OCH491 REVISED EDITION A Distributed in Dec 2010 No OCH491 Made in Japan New publication effective Oct 2012 Specifications are subject to change without notice
18. 961 88 78 568 A 92411 1220 ure1q u0sseooy 929 2 10 3noxoouy 229 2 10 ejou 3noxoouy 0019 594 10 jNoyoouy edid seddn 10 ajoy jnoyoouy uonoeuuoo peJejj epis edid pinbi uonoeuuoo uonoeuuoo edid se6 uogoeuuoo 91 10 jnoyoouy y eui 10J uoroeuuoo edid qrjuugez uonoeuuoo edid abeureiq pojeisusi 1800S UeuM 12010913 92 662 LO 096 089 026 08 Ori youd 04 uoIsuedsns 7 16 2 Isnp jo esneoeq eq 1 1 1eau au uonisod 92919 juepuedepui ueu juepuedepul aui suoruod pepeus au ens edid 1691 ay jo eseo si 29412919 TTE T ke 8 1 084 15 OCH491B Uni
19. D To stop air conditioner press the ON OFF button Press the TEST button for three seconds so that Maintenance 24 MITSUBISHI ELECTRIC a EEE monitor Em gt E z 2 ses ji TEMP DONOFF d ieu RA Em qu 5 request code 7142038 OMENU hall mom eu Ge GE 4 318 either 3552 CHEK Tes uu D GD 5 21 9 Refrigerant address 9 Data display area 6 Request code display area OCH491B maintenance mode Press the TEMP buttons CA and to set the Refrigerant address 01 mode appears on the screen at 00 Refrigerant address appears on the screen a few minutes at Press the button for three seconds to switch to Maintenance appears on the screen at when Maintenance monitor is Press the CLOCK buttons and V to set the desired Rotation amp Back up operation Please match request code with 311 2nd stage cut in operation Please match request code with 321 324 either Press the FILTER button to perform data request The requested data will be displayed at in the same way as in 01 Refrigerant address appears on the screen in a few minutes at Please set above 3 To return to normal mode press the ON OFF button 40 12
20. ee Select Request code with the F1 or button and press the 2 button 5 2 Set the Refrigerant address and Request code P Ref address Select the item to be changed with the 1 or F2 button Requestcode 311 Select the required setting with the F4 button Request V F4 button C C C C m lt Request code setting Press the 2 button Data will be collected and displayed Request code P Ref address E Request code 311 Select the required code No 311 318 321 324 with the u lt Ref address gt setting 0 15 Request code 311 Rotation and Back up OFF 0311 CEU Request 4 OCH491B 39 3 Rotation and back up operation PAR 30MAA PAR 31MAA Main Main menu 3 3 Maintenance Initial setting Service Main display Cursor 4 Page Fl Fe F3 0 Service menu Enter maintenance password E999 Select Service menu _ 1 2 Test run Input maintenance info Function setting Check Self check Main menu Check menu 1 1 Error history Refrigerant volume check Refrigerant leak check Smooth maintenance Request code Service menu Request code Refaddress WO Request code 004 Request Pre
21. prevention mode if pipe liquid or condenser evaporator gt temperature stays under 15 C for 3 minutes 3 minutes after the compressor started Abnormal if it stays under 15 C for 3 minutes again within 16 minutes after 6 minute resume prevention mode Overheating protection Heating mode The units is in 6 minute resume prevention mode if pipe liquid or condenser evaporator gt temperature is detected as over 70 C after the compressor started Abnormal if the temperature of over 70 C is detected again within 30 minutes after 6 minute resume prevention mode Cooling or drying mode Q Clogged filter reduced airflow Short cycle of air path 9 Low load low temperature operation out of the tolerance range Defective indoor fan motor Fan motor is defective Indoor controller board is defec tive Defective outdoor fan control Overcharge of refrigerant Defective refrigerant circuit clogs Heating mode Clogged filter reduced airflow Short cycle of air path G Over load high temperature operation out of the tolerance range Defective indoor fan motor Fan motor is defective Indoor controller board is defec tive Defective outdoor fan control Overcharge of refrigerant Defective refrigerant circuit clogs Bypass circuit of outdoor unit is defective Cooling or drying mode Check clogs of the filter Remove blockage Refer to 10 6
22. thermistor Defective refrigerant circuit Converse connection of extension pipe on plural units connection Converse wiring of indoor outdoor unit connecting wire on plural units connection Defective detection of indoor room temperature and pipe lt condenser evaporator gt temperature thermistor Stop valve is not opened completely 26 Check pipe liquid or condenser evapora tor temperature with room temperature display on remote controller and outdoor controller circuit board Pipe liquid or condenser evaporator gt temperature display is indicated by set ting SW2 of outdoor controller circuit board as follows controller circuit board after connecting Conduct temperature check with outdoor A Control Service Tool PAC SK52ST Check converse connection of extension pipe or converse wiring of indoor outdoor unit connecting wire Error Code Abnormal point and detection method Cause Countermeasure Pipe temperature thermistor Condenser Evaporator TH5 mode if short open of thermistor is detected Abnormal if the unit does not unit returns to normal operation if it has been reset normally Constantly detected during cooling drying and heating operation except defrosting Short 90 C or more Open 40 C or less The unit is in 3 minute resume protection get back to normal within 3 minutes The Defective thermistor characteristics
23. 5 minute increments Energy saving rate can be set to value from 0 or 50 to 90 in 10 increments Clock setting is required Night setback Use to make Night setback settings Select Yes to enable the setting and No to disable the setting The temperature range and the start stop times can be set Clock setting is required Restriction Temp range Use to restrict the preset temperature range Different temperature ranges can be set for different operation modes Operation lock Use to lock selected functions The locked functions cannot be operated Maintenance Auto descending panel Auto descending panel Optional parts Up Down you can do Manual vane angle Use to set the vane angle for each vane to a fixed position Initial setting Main Sub When connecting two remote controllers one of them needs to be designated as a sub controller Clock Use to set the current time Main display Use to switch between Full and Basic modes for the Main display The default setting is Full Contrast Use to adjust screen contrast Initial setting Display details Make the settings for the remote controller related items as necessary Clock The factory settings are Yes and 24h format Temperature Set either Celsius C or Fahrenheit F Room temp Set Show or Hide Auto mode Set the Auto mode display or Only Auto display Auto mode Whether or
24. Check outdoor fan motor amp Check operating condition of refrigerant circuit Heating mode Check clogs of the filter Remove blockage Refer to 10 6 Check outdoor fan motor Check operating condition of refrigerant circuit Pipe temperature Cooling mode Detected as abnormal when the pipe temperature is not in the cooling range 3 minutes after compressor start and 6 minutes after the liquid or condenser evaporator pipe is out of cooling range Note 1 It takes at least 9 minutes to detect Note 2 Abnormality P8 is not detected in drying mode Cooling range 3 C TH TH1 TH Lower temperature between liquid pipe temperature TH2 and condenser evaporator temperature TH5 TH1 Intake temperature Heating mode When 10 seconds have passed after the compressor starts operation and the hot adjustment mode has finished the unit is detected as abnormal when condenser evaporator pipe temperature is not in heating range within 20 minutes Note 3 It takes at least 27 minutes to detect abnormality Note 4 It excludes the period of defrosting Detection restarts when defrosting mode is over Heating range 3 TH5 TH1 OCH491B Q Slight temperature difference between indoor room temperature and pipe liquid or condenser evaporator gt temperature thermistor Shortage of refrigerant Disconnected holder of pipe liquid or condenser evaporator
25. PARTS CATALOG OCB491 WIRELESS REMOTE WIRED REMOTE CONTROLLER CONTROLLER Option Option 1 TECHNICAL CHANGES PCA RP50KAQ gt PCA RP50KAQR1 6 gt PCA RP60KAQR1 PCA RP71KAQ gt PCA RP71KAQR1 INDOOR CONTROLLER BOARD has been changed 2 REFERENCE MANUAL 2 1 OUTDOOR UNIT S SERVICE MANUAL Service Ref Service Manual No SUZ KA50 60 71 VA3 TH A OCH511 OCB511 PUHZ RP50 60 7 1 VHA4 PUHZ RP100 125 140VKA PUHZ RP100 125 140 200 250YKA PUHZ RP200YKAR1 PUHZ ZRP35 50VKA PUHZ ZRP60 71VHA OCH451 OCB451 PUHZ ZRP100 125 140VKA Doe OURS PUHZ ZRP100 125 140YKA PU H P71 100VHAR3 UK OC379 PU H P71 100 125 1 40YHAR3 UK PUHZ P1 00 1 25 140VHA3R2 UK PUHZ P100 125 140YHAR1 UK PUHZ P200 250YHA3R2 OCH424 OCB424 SUZ KA50 60 71VA2 TH OCH472 OCB472 SUZ KA50 60 71VA2 TH A OCH473 OCB473 SUZ KA25 35 50 60 71VA3 TH OCH530 OCB530 2 2 TECHNICAL DATA BOOK Series Outdoor unit Manual No SUZ KA VA OCS03 PUHZ RP HA4 PUHZ RP KA 96916 PUHZ P VHA3 PUHZ P YHAR3 2 OCS22 Note The phrase Wired remote controller in this service manual refers to the PAR 21MAA If you need any information for the other remote controller please refer to either the instaollation manual or initilal setting manual which are in these boxes OCH491B 2
26. minutes Timer On Off timer Use to set the operation On Off times Time can be set in 5 minute increments Clock setting is required Auto Off timer Use to set the Auto Off time Time can be set to a value from 30 to 240 in 10 minute increments Filter information Use to check the filter status filter sign can be reset Error information Use to check error information when an error occurs Error code error source refrigerant address unit model manufacturing number contact information dealer s phone number can be displayed The unit model manufacturing number and contact information need to be registered in advance to be displayed Weekly timer Use to set the weekly operation On Off times Up to eight operation patterns can be set for each day Clock setting is required Not valid when the On Off timer is enabled Energy saving Auto return Use to get the units to operate at the preset temperature after performing energy save operation for a specified time period Time can be set to a value from 30 and 120 in 10 minute increments This function will not be valid when the preset temperature ranges are restricted Schedule Set the start stop times to operate the units in the energy save mode for each day of the week and set the energy saving rate Up to four energy save operation patterns can be set for each day Time can be set in
27. the piping indoors and keep both ends of the piping sealed until just before brazing Leave elbow joints etc in their packaging If dirt dust or moisture enters into refrigerant cycle that can cause deterioration of refrigerant oil or malfunction of com pressor If dirt dust or moisture enters into refrigerant cycle that can cause deterioration of refrigerant oil or malfunction of com pressor Do not use a charging cylinder If a charging cylinder is used the composition of refrigera nt will change and the efficiency will be lowered The refrigerant oil applied to flare and flange connections must be ester oil ether oil or alkylbenzene oil in a small amount Use the specified refrigerant only If large amount of mineral oil enters that can cause deterio ration of refrigerant oil etc Charge refrigerant from liquid phase of gas cylinder If the refrigerant is charged from gas phase composition change may occur in refrigerant and the efficiency will be lowered Never use any refrigerant other than that specified Doing so may cause a burst an explosion or fire when the unit is being used serviced or disposed of Correct refrigerant is specified in the manuals and on the spec labels provided with our products We will not be held responsible for mechanical failure system malfunction unit breakdown or accidents caused by failure to follow the instructions
28. 3 SAFETY PRECAUTION 3 1 ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal all supply circuits must be disconnected 3 2 CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilising refrigerant R410A Use new refrigerant pipes In case of using the existing pipes for R22 be careful with the followings For RP100 125 140 be sure to perform replace ment operation before test run Change flare nut to the one provided with this product Use a newly flared pipe Avoid using thin pipes Use a vacuum pump with a reverse flow check valve Vacuum pump oil may flow back into refrigerant cycle and that can cause deterioration of refrigerant oil etc Use the following tools specifically designed for use with R410A refrigerant The following tools are necessary to use R410A refrigerant Make sure that the inside and outside of refrige rant piping is clean and it has no contaminants such as sulfur oxides dirt shaving particles etc which are hazard to refrigerant cycle In addition use pipes with specified thickness Tools for R410A Flare tool Size adjustment gauge Vacuum pump adaptor Electronic refrigerant charging scale Gauge manifold Charge hose Gas leak detector Torque wrench Contamination inside refrigerant piping can cause deterio ration of refrigerant oil etc Handle tools with care Store
29. 8 g 4LMENU button Press to bring up the Main menu T Function guide ackli Operation settings will appear Function button F1 When the backlight is off pressing any Main display Press to change the operation button turns the backlight on and it mode will stay lit for a certain period of time depending on the screen Main menu Press to move the cursor down 5 Function button F2 Main display Press to decrease temperature 6 ON OFF lamp Main menu Press to move the cursor up This lamp lights up in green while the unit is in operation It blinks while the remote 1 controller is starting up or when there is I 9 Function button Main display Press to increase temperature Main menu Press to go to the previous page p 10 Function button Main display Press to change the fan speed Main menu Press to go to the next page Main menu list Setting and display items Setting details Lossnay Vane Louver Vent Use to set the vane angle Select a desired vane setting from five different settings Use to turn ON OFF the louver Select a desired setting from ON and OFF Use to set the amount of ventilation Select a desired setting from Off Low and High High power Use to reach the comfortable room temperature quickly Units can be operated in the High power mode for up to 30
30. 8 9 r Room 28 E 82 Set temp 28c Basic mode 2 EN All icons are displayed for explanation 1 Operation mode The main display can be displayed in two different modes Full and Basic 112 2 Preset temperature Appears when the buttons are locked 13 Indoor unit operation mode appears here 3 Clock Preset temperature appears here Appears when the On Off timer or Night setback function is enabled 114 Appears when the Weekly timer is enabled 1159 See the Installation Manual Current time appears here I Fan speed Fan speed setting appears here Appears while the units are operated in the energy save mode 5 Button function guide 16 26 of the corresponding buttons appear Appears while the outdoor units are operated in the silent mode 15 35 Wm o 0 H t1 m Appears when the ON OFF operation is centrally controlled Appears when the built in thermistor on the remote controller is activated to monitor the v temperature a als room tempi i i un bu rd he operation mode is centrally appears when the thermistor on the controled indoor unit is activated to monitor the room E 9 temperature Appears when the preset temperature is centrally I 18 o controlled Indicates the vane setting 9 gies Appears when the fi
31. CA RP50KAQR1 PCA RP60KAQR1 PCA RP71KAQR1 SWE CN2L Emergency operation Connector LOSSNAY LED3 Transmission Indoor outdoor CNV Vane motor output MV 12V pulse output CN90 Connect to the wireless remote controller board CNB de ilg oe gt Model selection CN105 LED o P Do lU swe Power supply R B Capacity setting CN4F Drain float switch FS option CN44 Pipe temperature thermistor Liquid TH2 9 0 Cond Eva 5 Jumper wire J41 J42 Pair No setting for wireless remote controller CN51 Centrally control Control signal 13VDC pulse input Operation indicator mu ono 970 sexo woo g m ceee 0000 m ET Lg 5 6 13VDC CN20 Malfunction indicator Room temperature 13VDC thermistor TH1 oo CN41 Connector inal LED1 HA terminal A Power supply 1 CN22 Connect to the terminal block TB5 Remote controller con necting wire 10 4 14 6V DC Vre Voltage between PC6722 and C955 Same as of CNMF en 5 CN3C Transmission Indoor outdoor Vse Voltage between pins of 0 24V DC C626 DCOV FAN stop DC1 6 5V FAN operation Same as 0 of CNMF CNMF Fan motor DC 310 340V DC15V DC0 6 5V Stop or 15V Operatio
32. Changes for the Better MITSUBISHI ELECTRIC SPLIT TYPE HEAT PUMP AIR CONDITIONERS SPLIT TYPE AIR CONDITIONERS October 2012 No OCH491 REVISED EDITION B SERVICE MANUAL Series PCA Ceiling Suspended R410A Indoor unit Revision Model names Service Ref PCA RP35KAQ and e 5 PCA RPSOKAG PCA RP50KAQ cine ees Mone oue 60 R P60 K AQ REVISED EDITION A PCA RP60KAQR1 NOTE This manual describes only PCA RP71KAQ PCA RP71KAQ service data of the indoor PCA RP71KAQR1 have PCA RP100KAQ wwe PCA RP125KAQ PCA RP140KAQ PCA RP140KAQ CONTENTS 1 TECHNICAL CHANGES 2 2 REFERENCE 2 3 SAFETY PRECAUTION nnn 3 4 PART NAMES AND 4 22 9 6 NOISE CRITERION CURVES 13 7 OUTLINES AND DIMENSIONS 15 8 WIRING 19 Modelname 9 REFRIGERANT SYSTEM DIAGRAN 20 indication 10 TROUBLESHOOTING 21 11 SPECIAL FUNCTION 37 12 DISASSEMBLY 41
33. OOR UNIT OUTDOOR UNIT 1 1 of 2 refrigerant groups Refer to Fig 1 Main indoor unit should be connected for wired remote controller and the transmission line TB5 for main and sub unit should also be connected Refer to Fig 1 This function cannot be set by wireless remote controller Set refrigerant address of each unit Dip switch on the outdoor unit Refrigerant address 00 01 Refrigerant address Refrigerant address ngo 01 Operation pattern Fig 1 Back up function only Request code number 312 Error occurs on main unit Start operation Main Sub Sub unit Rotation function amp Back up function Request code number 313 318 Error occurs on main unit Start operation Main Sub Main Sub Main Sub Outdoor unit IC Indoor unit unit Abnormal condition RC Wired remote controller Run IC 1 l Sub 1 unit 2 1 7 Gd 1 28 days 1 28 days Ex When the request code number is 313 each unit operates alternately in daily cycle Note When the unit is restarted to operate after turning off the power or OFF operation the unit which was operating will start operation To operate the main unit refer to the 11 1 2 and set the request code No which is not the same as the current one and set again the former request code No 2 2nd stage cut in function Outline of functions When the 1st unit can NOT su
34. Q NOTCH SPL dB LINE High 45 0 0 Medium1 43 Medium2 41 o e Low 39 _ 80 5 8 8 70 T 1 70 E e 1 60 4 3 T JNC 5 50 1 F F 5 4 3 f JNC 40 a pa 92 2 a 89 1 i i 4 i e N 3 9 1 20 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS 4 20 NOISE 10 T T t 63 125 250 1000 2000 4000 8000 BAND CENTER FREQUENCIES Hz ceiling 1m unit about 1 4m MICROPHONE 14 OUTLINES AND DIMENSIONS 7 Unit mm edid sued uondo eui Buyjjeysul ans eq eseo d z oq JOYOUR 10 MAINS B EM 10 O HN 95111 SALON 92 pojeisul SI 19 205 uieJp ueuM eez seb coz 56792 pinbil 8 INDOOR UNIT PCA RP35KAQ PCA RP50KAQR1 PCA RP50KAQ S8 089 9 7 281 8 8 Cexelurdv 16 NO aiv 062 hime
35. R BOARD LED2 LED PREPARATION FOR HEATING ORANGE DCL REACTOR RU RECEIVING UNIT PCARPSOKAQ BN ON 125 Bague MF FAN MOTOR SW1 EMERGENCY OPERATION HEAT DOWN OFF OFF MV VANE MOTOR SW2 EMERGENCY OPERATION COOL UP 12345 12345 TB2 TERMINAL BLOCK Indoor unit Power option parts DRAIN PUMP PCA RPGOKAG MEN GON FOAREHORAQ we S FS DRAIN FLOAT SWITCH 12345 PCA RPTIKAG DONNA s d 2 TRANSMISSION DCL TB6 WIRES LY DC12V 2 RB ES jee 2 YLW LB Refer to tables 1 and 2 pm J41 J42 OUTDOOR 1 222 CNOT 13 BLK Pair No D INDOOR OUTDOOR 1 L COMMUNCATION T 9 5 BLU o Q 1 LED3 1 02 LEDI CN22 BLU TB4 ss 51 X TO OUTDOOR FLOAT SW QUID PIPE INTAKE x ORN JORN CN4F CN44 CN20 CNMF 53 I WHT WHT RED ra p n RED ant Q r 9 BRN iM Ba When attaching When attaching H H DP drain pump drain pump OPTION PARTS 5 option parts option parts remove the jumper connector 1 41 and fit the drain FLOATSW o o o 9 Be sure to turn off the source power float switch FS AM s and then disconnect fan motor connector E Failure to do so will cause trouble in fan motor OPTION PARTS Notes 1 Symbols used in wiring diagram above are o Connector DCL 1 Fig 1 ZU Terminal block
36. STOP AUTO START 6 13 display Lights up while the signal is transmitted to the indoor unit when the button is pressed Temperature setting display Indicates the desired temperature setting which is set CLOCK display Displays the current time TIMER display Displays when in timer operation or when setting timer 33 1 display Displays the order of timer operation 0 0 display Displays whether timer is on or off button Sets any desired room temperature TIMER CONTROL buttons AUTO STOP OFF timer when this switch is set the air conditioner will be automatically stopped at the preset time AUTO START ON timer when this switch is set the air conditioner will be automatically started at the preset time h and min buttons Buttons used to set the hour and minute of the current time and timer settings LOUVER button Changes left right airflow direction CLOCK button RESET button SET button 4 3 WIRED REMOTE CONTROLLER OPTION lt PAR 30MAA PAR 31MAA gt The functions which can be used are restricted according to the model Display The factory setting is Full 13 15 Full mode mode 12 14 16 17 18 O08 17 8
37. Sliding the panel to the front Side panel N Left S Screws OPERATING PROCEDURE PHOTOS amp ILLUSTRATIONS 7 Removing the vane motor 1 Remove the air intake See Figure 1 2 Remove the right side panel See Figure 3 4 Remove the connector of vane motor Remove 2 screws of vane motor cover then remove vane motor 2 3 4 Photo 13 Connector Vane motor and cover Screws 8 Removing the under panel Remove the air intake grille See Figure 1 2 Remove the left and right side panels See Figure 3 4 Remove the beam See Photo 1 Remove the electrical cover See Photo 1 Pull the electrical box downward See Photo 2 Wireless remote controller receiver type only Disconnect the connector CNB from the PCB for wire less remote controller and remove the clamp and strap for wires 7 Remove 8 screws from the under panel 8 Move the under panel forward by about 10mm and remove the under panel 1 2 3 4 5 6 Photo 14 Under panel fixing screws N 9 Removing the drain pan 1 Remove the air intake grille See Figure 1 2 2 Remove the side panel right and left See Figure 3 4 3 Remove the under panel See Photo 14 Remove the screws of the right and left side drain pan See Photo 15 4 Remove 2 insulation in centre of the drain pan and after removing 2 screws with washer remove the drain pan See Photo 16 17 No
38. ach on vacuum pump Refrigerant charge base Refrigerant cylinder Only for R410A of cylinder Pink Cylinder with syphon Refrigerant recovery equipment 4 PART NAMES AND FUNCTIONS 4 1 INDOOR UNIT Louver Air outlet Filter Air intake Inside of Air intake OCH491B 4 4 2 WIRELESS REMOTE CONTROLLER OPTION The functions which can be used are restricted according to the model CHECK display Indica that the unit is being checked or test run MODEL SELECT display Blinks when model is selected OPERATION MODE display OPERATION MODE display Indicates which operation mode is in effect display The vertical direction of airflow is indicated h f display Displays selected fan speed ON OFF button The unit is turned ON and OFF alternately each time the button is pressed FAN SPEED SELECT button Changes the fan speed MODE SELECT button Switches the operation mode between COOLING DRY FAN HEATING and AUTO mode CHECK TEST RUN button Performs an inspection check or test operation Do not use it for normal operation VANE CONTROL button Changes the air flow direction OCH491B AUTO
39. be sure to replace the 4 way valve Check refrigerant pipes for disconnection or leakage After the recovery of refrigerant vacuum dry the whole refrigerant circuit Refer to section 10 6 2 Check refrigerant circuit for operation To avoid entry of moisture or air into refrigerant circuit which could cause abnormal high pressure purge air in refrigerant circuit or replace refrigerant 10 4 TROUBLESHOOTING OF PROBLEMS Phenomena Note Refer to the manual of outdoor unit for the detail of remote controller Cause Countermeasure 1 LED2 on indoor controller board is off OCH491B When LED1 on indoor controller board is also off Power supply of rated voltage is not supplied to out door unit Defective outdoor controller circuit board 9 Power supply of 220 240V is not supplied to indoor unit Defective indoor controller board For the separate indoor outdoor unit power sup ply system Power supply of 220 240V AC is not supplied to indoor unit The connectors of the optional replacement kit are not used 9 Defective indoor controller board D Check the voltage of outdoor power supply terminal block L N or Ls N When AC 220 240V is not detected check the power wiring to outdoor unit and the breaker When AC 220 240V is detected check below Check the voltage between outdoor terminal block S1 and S2 When AC 220 240V is not detect
40. check Contact of fan motor connector CNMF Is there contact failure gt Yes gt Power supply check Remove the connector Measure the voltage in the indoor controller circuit board TEST POINT Voc between 1 and 4 of the fan connector Voc DC310 340V TEST POINT Vcc between 5 and 4 of the fan connector Vec DC15V lt Is the voltage normal gt gt Indoor controller board fuse check M No Replace lt Is the fuse normal gt Y Yes RT OK Replace the indoor NG Check the operation gt END controller board 7 OK Check the operation gt END 5 Replace the fan motor Sensor signal check Measure the voltage between DC 0 and DC 15V in the indoor controller circuit board Does the voltage repeat DC OV and DC 15V Replace pes motor E es Y Yes Check the operation of fan END Replace the indoor controller board Y Replace the indoor controller board 4 OK Check the operation gt END NG C Replace the fan motor b OCH491B 34 10 7 TEST POINT DIAGRAM Indoor controller board PCA RP35KAQ PCA RP50KAQ PCA RP60KAQ PCA RP71KAQ PCA RP100KAQ PCA RP125KAQ PCA RP140KAQ P
41. code in the parenthesis indicates PAR 30MAA model OCH491B 23 On wireless remote controller The continuous buzzer sounds from receiving section of indoor unit Blink of operation lamp On wired remote controller Check code displayed in the LCD If the unit cannot be operated properly after test run refer to the following table to find the cause Symptom Wired remote controller LED 1 2 PCB in outdoor unit For about 2 After LED 1 2 are lighted LED 2 is about 2 minutes following power on op PLEASE WAIT minutes after turned oft then only LED 1 is eration of the remote controller is not possible power on lighted Correct operation due to system start up Correct operation PLEASE WAIT Error code Subsequent to about 2 minutes after power on Display messages do not appear even when operation switch is turned ON operation lamp does not light up Only LED 1 is lighted gt LED 1 2 blink Connector for the outdoor unit s protection device is not connected Reverse or open phase wiring for the outdoor unit s power terminal block L1 L2 L3 Only LED 1 is lighted LED 1 blinks twice LED 2 blinks once Incorrect wiring between indoor and outdoor units incorrect polarity of S1 S2 S3 Remote controller wire short On the wireless remote controller with condition above following phenomena take place No signals from t
42. d Q Replace indoor controller board The check code in the parenthesis indicates PAR 30MAA model Remote controller control board Abnormal if data cannot be read nor mally from the nonvolatile memory of the remote controller control board Error code E1 Abnormal if the clock function of remote controller cannot be operated normally Error code E2 Defective remote controller Q Replace remote controller Forced compressor stop due to water leakage abnormality Q The unit has a water leakage abnormality when the following conditions a and b are satisfied while the above mentioned detection is performed a The intake temperature subtracted with liquid pipe temperature detects to be less than 10 C for a total of 30 minutes When the drain sensor is detected to be NOT soaked in the water the detection record of a and b will be cleared b Drain float switch detects to be in the water for more than 15 minutes Once the water leakage abnormality is detected abnormality state will not be released until the main power is reset OCH491B Drain pump trouble Drain defective Drain pump clogging Drain pipe clogging 9 Open circuit of float switch Contact failure of float switch connector Dew condensation on float switch Drain water descends along lead wire Drain water waving due to filter clogging Extension piping connection difference at twin tr
43. dium1 High m min CFM 10 11 12 14 355 390 460 497 External static pressure Pa mmAq O direct blow INDOOR UNIT Operation control amp Thermostat Remote controller amp built in Noise level Low Medium2 Medium1 High 31 33 36 39 Field drain pipe O D 26 1 Dimensions 960 37 13 16 680 26 3 4 230 9 1 16 Weight Service Ref PCA RP50KAQ PCA RP50KAQR1 Mode Cooling Heating Power supply phase cycle voltage Single phase 50Hz 230V Input 0 05 0 05 Running current 0 37 0 37 External finish Munsell 6 4Y 8 9 0 4 Heat exchanger Plate fin coil Fan Fan drive x No Sirocco fan direct x 2 Fan motor output kW 0 090 Airflow Low Medium2 Mediumt High 10 11 13 15 355 390 460 530 External static pressure O direct blow 2 5 oc Operation control amp Thermostat Remote controller amp built in Noise level Low Medium2 Medium1 High 32 34 37 40 Field drain pipe O D 26 1 Dimensions 960 37 13 16 680 26 3 4 230 9 1 16 Weight Service Ref PCA RP60KAQ PCA RP60KAQR1 Mode Cooling Heating Power supply phase cycle voltage Single phase 50Hz 230V Input 0 06 0 06 Running current 0 39 0 39 External finish Munsell 6 4Y 8 9 0 4
44. e Open 40 or less Defective thermistor characteristics Contact failure of connector CN20 on the indoor controller board Insert failure Breaking of wire or contact failure of thermistor wiring Defective indoor controller board Check resistance value of thermistor OTC 15 0kQ 10 9 6kQ 20 6 3kQ 30 4 3kQ 40 C 3 0kQ If you put force on draw or bend the lead wire with measuring resistance value of thermistor breaking of wire or contact failure can be detected Check contact failure of connector CN20 on the indoor controller board Refer to 10 7 Turn the power on again and check restart after inserting connector again Check room temperature display on remote controller Replace indoor controller board if there is abnormal difference with actual room temperature Turn the power off and on again to operate after check Pipe temperature thermistor Liquid TH2 The unit is in 3 minute resume prevention mode if short open of thermistor is detected Abnormal if the unit does not reset normally after 3 minutes The unit returns to normal operation if it has been reset normally Constantly detected during cooling drying and heating except defrosting operation Short 90 C or more Open 40 or less Defective thermistor characteristics Contact failure of connector CN44 on the indoor controller board Insert failure Breaking of wire
45. e electrical box downward 5 Temporarily secure the electrical box using 2 hooks in the back of electrical box 6 Remove 4 screws fixing fan guard of the fan motor 2 screws See Photo 5 2 screws Upper the electrical box 7 Remove 2 screws fixing fan guard of piping side and remove the fan guard See Photo 6 8 Remove the lower casing while pressing the 4 catches of the casing right side of the fan motor 9 Loosen the 2 set screws 2 hexagon set screws of con necting joint and slide the fan motor to the left See Photo 5 10 Remove the motor piece left and right each 1 screw See Photo 5 11 Remove the fan motor and right side fan together 12 Loosen the set screw hexagon set screw of fan and remove the fan from the shaft See Photo 7 8 Photo 8 Hexagon set screw OCH491B Photo 5 Set screws Fai Connecting joint Photo 6 Catch Photo 7 42 Fan motor guard fixing screws Motor piece fixing screws guard fixing screws Hole for driver OPERATING PROCEDURE PHOTOS amp ILLUSTRATIONS 5 Removing the fan 3 connection 1 Remove the air intake grille See Figure 1 2 2 Remove the beam by removing screws See Photo 1 3 Remove 2 screws from the electrical cover and remove the electrical cover 4 Remove 2 screws from the electrical box and pull the electrical box downward Temporaril
46. eck Number of flashes beeps in pattern indicates code in the following table i e n 5 for U2 the check code in the following table Output pattern A Errors detected by indoor unit Wireless remote controller _ Wired remote controller Beeper sounds OPERATION Symptom Remark INDICATOR lamp flashes Check code Number of times 1 P1 Intake sensor error 2 P2 Pipe TH2 sensor error P9 Pipe TH5 sensor error 3 E6 E7 Indoor outdoor unit communication error 4 P4 Drain sensor error Float switch connector CN4F open 5 P5 Drain pump error PA Forced compressor stop due to water leakage abnormality 6 P6 Freezing Overheating protection operation r 7 EE Communication error between indoor and outdoor units 8 P8 Pipe temperature error 9 E4 E5 Remote controller signal receiving error 10 11 12 Fb 3 Indoor unit control system error memory error etc 14 PL Refrigerant circuit abnormal Remote controller transmission error 1 2 Remote controller control board error Output pattern B Errors detected by unit other than indoor unit outdoor unit etc Wireless remote controller Wired remote controller Beeper sounds OPERATION INDICATOR lamp flashes Check code Number of times Symptom Remark Indoor outdoor unit communication error 1 E9 Transmitting error Outdoor unit 2 UP Co
47. ed check the fuse on outdoor controller circuit board check the wiring connection When AC 220 240V is detected check below Check the voltage between indoor terminal block S1 and S2 When AC 220 240V is not detected check indoor outdoor unit connecting wire for miswiring When AC 220 240V is detected check below Check the fuse on indoor controller board Check the wiring connection If no problem are found indoor controller board is defective Check the voltage of indoor power supply terminal block L N When AC220 240V is not detected check the power supply wiring When AC220 240V is detected check below Check that there is no problem in the method of connecting the connectors When there are problems in the method of connecting the connectors connect the connector correctly referring to installation manual of an optional kit When there is no problem in the method of connecting the connectors check below Check the fuse on indoor controller board Check the wiring connection If no problem are found indoor controller board is defective When LED1 on indoor controller board is lit Mis setting of refrigerant address for outdoor unit There is no unit corresponding to refrigerant address 40 30 Check again the setting of refrigerant address for outdoor unit Set the refrigerant address to 0 For grouping cont
48. epis edid seD uonoeuuoo edid jueJeDujeu 16 0821 089 Buidid uresp 19 10 jnoyoouy 1191 eui 10 gt 02 edid eDeureiq edid jayoos 2 snp jo eq eu Z uonsod ul yoeq eoeid au 1nd uau EZ eoeid jJuapuadapu pepeus ay 0 ens edid 1e8J 0 9522 ul Drac eona umop si 29112919 ueuM 29 youd uorsuedsns zez t 061 9y 98 921 98 092 8 eona 1 084 061 OCH491B mm Uni Ajuo edid syed uondo euns eq esea qd z 109 JOYOUL 10 M9J9S g EM 10 QLN 99 s 194003 88 61 2 seb 2560 pinbii 9vc Eez 002 081 982
49. esneoeq eq 1 1 jepu ul yoeq eoeid y 1nd ueu y suomiod papeys y 0 ans edid see y Jo eseo si ES GZ 1 97 Fer 02 gt 691 1 x 061 3 eoutoer3 8 MIIA 1 084 17 OCH491B WIRED REMOTE CONTROLLER Option PAR 21MAA MITSUBISHI ELECTRIC PA R 30MAA afa MITSUBISHI ELECTRIC OCH491B Unit mm 19 5 wk 4 e CN Ape LO 19 A 8 WIRING DIAGRAM PCA RP35KAQ PCA RP100KAQ PCA RP50KAQR1 PCA RP50KAQ PCA RP125KAQ PCA RP60KAQR1 PCA RP60KAQ PCA RP140KAQ PCA RP71KAQR1 PCA RP71KAQ
50. h unit can be checked via the remote controller Maintenance password Take the following steps to change the maintenance password Remote controller check When the remote controller does not work properly use the remote controller checking function to trouble OCH491B shoot the problem 4 4 WIRED REMOTE CONTROLLER OPTION lt PAR 21MAA gt The functions which can be used are restricted according to the model Sensor indication Day of Week Displays when the remote controller Shows the current day of the week sensor is used Display Section For purposes of this explanation all parts of the display are shown Time Timer Display During actual operation only r the relevant items will be lit Shows the current time unless the simple or Auto Off Locked indicator timer is set Indicates that remote controller but If the simple or Auto Off timer is set the time to be tons have been locked switched off is shown Identifies the current operation Shows the operating mode etc Multilanguage display is available Clean The Filter indicator To be displayed on when it is time to clean the filter MITSUBISHI ELECTRIC
51. he function should be set again 1 Request Code List Rotation setting Setting No Initial Request code Setting contents setting Monitoring the request code of current setting Rotation and Back up OFF Normal group control operation Back up function only Rotation ON Alternating interval 1day and back up function Rotation ON Alternating interval 3days and back up function Rotation ON Alternating interval 5days and back up function Rotation ON Alternating interval 7days and back up function Rotation ON Alternating interval 14days and back up function Rotation ON Alternating interval 28days and back up function 2nd unit cut in setting Setting No Initial Request code Setting contents setting Monitoring the request code of current setting Cut in function OFF Cut in function ON Set point Set temp 4 C 7 2 F Cut in function ON Set point Set temp 6 C 10 8 F Cut in function ON Set point Set temp 8 C 14 4 F OCH491B 38 2 Setting method of each function by wired remote controller PAR 30MAA PAR 31MAA Stop operation Check menu Vl Error history Cw Refrigerant volume check Refrigerant leak check Select Service from the Main menu and press the 2 button Smooth maintenance Request code Service menu Select Check with the F1 F2 button and press the 2 button
52. he remote controller can be received Operation lamp is blinking The buzzer makes a short ping sound Note Operation is not possible for about 30 seconds after cancellation of function selection Correct operation For description of each LED LED1 2 3 provided on the indoor controller refer to the following table LED1 power for microprocessor always lit Indicates whether control power is supplied Make sure that this LED is LED2 power for remote controller Indicates whether power is supplied to the remote controller This LED lights only in the case of the indoor unit which is connected to the outdoor unit refrigerant addresses 0 LED3 communication between indoor and outdoor units Indicates state of communication between the indoor and outdoor units Make sure that this LED is always blinking OCH491B 24 10 3 SELF DIAGNOSIS ACTION TABLE Error Code Abnormal point and detection method Note Refer to the manual of outdoor unit for the details of display Cause such as F U and other E Countermeasure Room temperature thermistor TH1 The unit is in 3 minute resume prevention mode if short open of thermistor is detected Abnormal if the unit does not reset normally after 3 minutes The unit returns to normal operation if it has been reset normally Constantly detected during cooling drying and heating operation Short 90 C or mor
53. ing check the short cut of remote controller wires When LED is lit connect remote controller wires again and if LED2 is blinking remote controller is defective if LED2 is lit connection failure of remote controller terminal block etc has returned to normal 3 Upward downward vane performance failure The vane is not downward during defrosting and heat preparation and when the thermostat is OFF in HEAT mode Working of COOL protection function Vane motor does not rotate Defective vane motor Breaking of wire or connection failure of connector Upward downward vane does not work The vane is set to fixed position Normal operation The is set to horizontal regardless of remote control Check left Check the vane motor Refer to How to check the parts Check for breaking of wire or connection failure of connector Normal operation Each connector on vane motor side is disconnected or setting the fixed vanes by wired remote controller 4 Receiver for wireless remote controller OCH491B Weak batteries of wireless remote controller Contact failure of connector CNB on wireless remote controller board Insert failure Contact failure of connector CN90 on indoor con troller board Insert failure Contact failure of connector between wireless remote controller board and indoor controller board Replace batteries of wireless remote contro
54. iple quadruple system C Miswiring of indoor outdoor connecting at twin triple quadruple system Room temperature thermistor liquid pipe temperature thermistor detection is defective 28 Check the drain pump Check whether water can be drained Check the resistance of the float switch Check the connector contact failure Check the float switch leadwire mounted Check the filter clogging Check the piping connection Check the indoor outdoor connecting wires Check the room temperature display of remote controller Check the indoor liquid pipe temperature display of outdoor controller board Error Code Abnormal point and detection method Cause Countermeasure Abnormal refrigerant circuit During Cooling Dry or Auto Cooling operation when the following are regarded as failures when detected for one second a The compressor continues to run for 30 or more seconds b The liquid pipe temperature or the condense evaporator temperature is 75 C or more These detected errors will not be cancelled until the power source is reset OCH491B D Abnormal operation of 4 way valve Disconnection of or leakage refrigerant pipes 9 Air into refrigerant piping Abnormal operation no rotation of indoor fan Defective fan motor Defective indoor control board Defective refrigerant circuit clogging 29 When this error occurs
55. ircuit of remote controller Defective transmitting receiving circuit of indoor controller board Noise has entered into transmis sion wire of remote controller OCH491B Set a remote controller to main and the other to sub Remote controller is connected with only indoor unit The address changes to a separate setting Diagnose remote controller a When RC is displayed remote con trollers have no problem Turn the power off and on again to check When becoming abnormal again replace indoor controller board b When RC is displayed replace remote controller When RC or ERC 00 66 is dis played noise may be causing abnormal ity 27 Error Code Abnormal point and detection method Cause Countermeasure Indoor outdoor unit communication error Signal receiving error Abnormal if indoor controller board cannot receive any signal normally for 6 minutes after turning the power on Abnormal if indoor controller board cannot receive any signal normally for 3 minutes Consider the unit abnormal under the following condition When 2 or more indoor units are connected to an outdoor unit indoor controller board cannot receive a signal for 3 minutes from outdoor controller circuit board a signal which allows outdoor controller circuit board to transmit signals Contact failure short circuit or miswiring c
56. ller Check contact failure of each connector If no problems are found of connector replace indoor controller board When the same trouble occurs even if indoor controller board is replaced replace wireless remote controller board 31 10 5 EMERGENCY OPERATION 10 5 1 When wireless remote controller fails or its battery is exhausted When the remote controller cannot be used When the batteries of the remote controller run out or the remote control ler malfunctions the emergency operation can be done using the emer gency buttons on the grille D DEFROST STAND BY lamp Operation lamp Emergency operation switch heating Emergency operation switch cooling Receiver Starting operation 297 MITSUBISHI To operate the cooling mode press the lt button for more than 2 seconds To operate the heating mode press the 22 button for more than 2 seconds Lighting of the Operation lamp means the start of operation gt gt 40 Note Details of emergency mode are as shown below Operation mode Set temperature Fan speed Airflow direction High High Horizontal Downward 5 Stopping operation stop operation press the 22 button or the amp button 10 5 2 When wired remote controller or indoor unit microprocessor fails 1 When the wired remote control or the indoor unit microprocessor ha
57. lter reset function is centrally controlled Indicates the louver setting po B Indicates when filter needs maintenance 120 Indicates the ventilation setting p Room temperature 21 See the Installation Manual Appears when the preset temperature range is Current room temperature appears here restricted Controller interface ae MITSUBISHI ELECTRIC 5 6 DSO e H4 Function buttons When the backlight is off pressing any button turns the backlight on and does not perform its function except for the button Most settings except ON OFF mode fan speed temperature can be made from the Menu screen OCH491B The functions of the function buttons change depending on the screen Refer to the button function guide that appears at the bottom of the LCD for the functions they serve on a given screen When the system is centrally controlled the button function guide that corresponds to the locked button will not ON OFF button Press to turn ON OFF the indoor unit 2 SELECT button Press to save the setting appear button f Main display Main menu Press to return to the previous screen Fri Vi Pane Louer Vent Lossnay Room 28 c m High power Cool Settemp Auto Weekly timer OU sent mode 2
58. mpressor overcurrent interruption 3 US U4 Open short of outdoor unit thermistors For details check 4 UF Compressor overcurrent interruption When compressor locked he LED dis la Abnormal high discharging temperature 49C operated td Pey 5 U2 insufficient refrigerant bod d Abnormal high pressure 63H operated Overheatin 6 U1 Ud UD 3 protection 7 05 Abnormal temperature of heat sink outdoor unit s 8 U8 Outdoor unit fan protection stop service manual 9 U6 Compressor overcurrent interruption Abnormal of power module 10 U7 Abnormality of super heat due to low discharge temperature 11 U9 UH Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit Current sensor error 12 13 T 14 Others Other errors Refer to the technical manual for the outdoor unit 1 If the beeper does not sound again after the initial 2 beeps to confirm the self check start signal was received and the OPERATION INDICATOR lamp does not come on there are no error records 2 If the beeper sounds 3 times continuously beep beep beep 0 4 0 4 0 4 sec after the initial 2 beeps to confirm the self check start signal was received the specified refrigerant address is incorrect On wireless remote controller The continuous buzzer sounds from receiving section of indoor unit Blink of operation lamp On wired remote controller Check code displayed in the LCD 3 The check
59. n DC7 5V 0 15 pulse Vcc Voltage between pins of C955 15VDC Same as of CNMF CNO1 Connect to the Terminal Block TB4 Indoor outdoor connecting line Between 220 240V AC CNP Drain pump output DP 220 240V AC option 1 127 T6 3AL250V Ul om poses ruse CAUTION WEEK 25 UL AC250V 6 3A 250V OCH491B 35 10 8 FUNCTIONS OF DIP SWITCH AND JUMPER WIRE Each function is controlled by the dip switch and the jumper wire on control board SW1 and SW2 are equipped only for service parts Model setting and capacity setting are memorized in the nonvolatile memory of the control P C board of the unit Marks in the table below Jumper wire Short X Open Functions Setting by the dip switch and jumper wire The black square indicates a switch position Remarks Model settings For service board 1 23 4 5 Capacity settings Service board 12345 PCA RP35KAQ EB ON OFF MODELS ON OFF PCA RP50KAQ 2 2 ON OFF PCA RP60KAQ ON OFF PCA RP71KAQ ON OFF PCA RP100KAQ ON OFF PCA RP125KAQ PCA RP140KAQ WON OFF Pair number setting with
60. nosis Note Set refrigerant address using the outdoor unit s DIP switch SW1 For more information see the outdoor unit installation manual If an air conditioner error occurs the indoor unit s sensor emits an intermittent buzzer sound the operation light flashes and the error code is output It takes 3 seconds at most for error code to appear check mode is cancelled Refer to the following tables for details on the check codes Output pattern Beeper sounds Beep En e pa OPERATION eee Repeated INDICATOR lamp flash vl DOR On On A GE Ls On On pattern Self check TR p 5 sec 0 5 sec 0 5 sec 0 5 sec 0 5 sec Approx 2 5 sec 0 5 sec 0 5 sec starts 3 Start signal N ae received umber of flashes beeps in pattern indicates the check Number of flashes beeps in pattern indicates code in the following table i e n 5 for P5 the check code in the following table Output pattern B Beeper sounds Beep Beep Beep Beep Beep Beep Beep operation _ _________ i 29 deL 279 Repeated INDICATOR lamp flash 2 Off ne On On On On On Off t Oon pattern Self che check Approx 2 5 sec Approx 3 sec 0 5 sec 0 5 sec 0 5 sec 0 5 sec Approx 2 5 sec Approx 3 sec 0 5 0 5 sec starts MV a 7 Start signal received Number of flashes beeps in pattern indicates the ch
61. not to use the AUTO mode can be selected by using the button This setting is valid only when indoor units with the AUTO mode function are connected Administrator pass The administrator password is required to make the settings for the following items word Timer setting Energy save setting Weekly timer setting Restriction setting Outdoor unit silent mode setting Night set back Language selection Use to select the desired language Service Test run Select Test run from the Service menu to bring up the Test run menu Test run Drain pump test run Input maintenance Select Input maintenance Info from the Service menu to bring up the Maintenance information screen The following settings can be made from the Maintenance Information screen Model name input Serial No input Dealer information input Function setting Make the settings for the indoor unit functions via the remote controller as necessary LOSSNAY setting City Multi only This setting is required only when the operation of City Multi units is interlocked with LOSSNAY units Check Error history Display the error history and execute delete error history Refrigerant leak check Refrigerant leaks can be judged Smooth maintenance The indoor and outdoor maintenance data can be displayed Request cord Details of the operation data including each thermistor temperature and error history can be checked Self check Error history of eac
62. ol etc does not function 3 Avoid operating for a long time when the outdoor unit begins defrosting while emergency operation of the heating is activated because it will start to blow cold air 4 Emergency cooling should be limited to 10 hours maximum The indoor unit heat exchanger may freeze 5 After emergency operation has been deactivated set the switches etc to their original positions 6 Movement of the vanes does not work in emergency operation therefore you have to slowly set them manually to the appropriate position OCH491B 32 10 6 HOW TO CHECK THE PARTS PCA RP35KAQ 5 PCA RP60KAQ PCA RP71KAQ PCA RP100KAQ PCA RP125KAQ PCA RP140KAQ PCA RP50KAQR1 PCA RP60KAQR1 PCA RP71KAQR1 Parts name Check points Room temperature thermistor TH1 Liquid pipe thermistor TH2 Condenser evaporator temperature thermistor 5 Disconnect the connector then measure the resistance with a tester At the ambient temperature of 10 C 30 C Normal Abnormal Refer to Thermistor characteristic graph 4 3 9 6 Open or short Vane motor MV D Blue Yellow Measure the resistance between the terminals with a tester At the ambient temperature of 20 C 30 C Connector Red Yellow Red Blue Red Orange Red White Abnormal Open or short Drain pump DP Option 1 3 Measure the resistance between the terminals with a
63. oller O Diagnose remote controllers a When RC is displayed Remote controllers have no problem Turn the power off and on again to check If abnormality generates again replace indoor controller board b When RC is displayed Replace remote controller c When RC or ERC 00 66 is dis played noise may be causing abnormality If the unit is not normal after replacing indoor controller board in group control indoor controller board of address 0 may be abnormal Remote controller transmission error E3 signal receiving error E5 Abnormal if remote controller could not find blank of transmission path for 6 sec onds and could not transmit Error code E3 Remote controller receives transmitted data at the same time and compares the received and transmitted data Abnormal if these data are judged to be different 30 continuous times Error code E3 Q Abnormal if indoor controller board could not find blank of transmission path Error code E5 Q Indoor controller board receives trans mitted data at the same time and com pares the received and transmitted data Abnormal if these data are judged to be different 30 continuous times Error code E5 2 remote controllers are set as main In case of 2 remote controllers Remote controller is connected with 2 indoor units or more Repetition of refrigerant address Defective transmitting receiving c
64. onverse wiring of indoor outdoor unit connecting wire Defective transmitting receiving circuit of indoor controller board Defective transmitting receiving circuit of indoor controller board Noise has entered into indoor outdoor unit connecting wire Check LED display on the outdoor control circuit board Connect A control service tool PAC SK52ST Refer to outdoor unit service manual Check disconnection or looseness of indoor outdoor unit connecting wire of indoor unit or outdoor unit Check all the units in case of twin triple indoor unit system Turn the power off and on again to check If abnormality generates again replace indoor controller board or outdoor controller circuit board Other indoor controller board may have defect in case of twin triple indoor unit system Indoor outdoor unit communication error Transmitting error Abnormal if 1 receiving is detected 30 times continuously though indoor controller board has transmitted 0 Defective transmitting receiving circuit of indoor controller board Noise has entered into power supply 9 Noise has entered into outdoor control wire Turn the power off and on again to check If abnormality generates again replace indoor controller board Indoor controller board Abnormal if data cannot be read normally from the nonvolatile memory of the indoor controller board Defective indoor controller boar
65. or contact failure of thermistor wiring Defective refrigerant circuit is causing thermistor temperature of 90 C or more or 40 C or less Defective indoor controller board Check resistance value of thermistor For characteristics refer to P1 above Check contact failure of connector CN44 the indoor controller board Refer to 10 7 Turn the power on and check restart after inserting connector again Check pipe lt liquid gt temperature with remote controller in test run mode If pipe lt liquid gt temperature is extremely low in cooling mode or high in heating mode refrigerant circuit may have defective Check pipe lt liquid gt temperature with remote controller in test run mode If there is extremely difference with actual pipe lt liquid gt temperature replace indoor controller board Turn the power off and on again to operate after check Contact failure of drain float switch CN4F Extract when the connector of drain float switch is disconnected and of connector CN4F is not short circuited Constantly detected during operation Contact failure of connector Insert failure Defective indoor controller board Check contact failure of float switch connector Turn the power on again and check after inserting connector again Operate with connector CN4F short circuited Replace indoor controller board if abnormalit reappears Drain over flo
66. or controller board 6 Remove the 6 supports from the indoor controller board and remove the indoor controller board See Photo 3 OCH491B 41 fixing screw Electrical cover 4 x 8 PT Electrical cover fixing screws Photo 2 Electrical box fixing screws Electrical box Photo 3 Indoor controller board Room temperature Reactor DCL thermistor TH1 Terminal blocks 4 5 OPERATING PROCEDURE PHOTOS amp ILLUSTRATIONS 3 Removing the room temperature thermistor TH1 1 Remove the air intake grille See Figure 1 2 2 Remove the beam by removing screws See Photo 1 3 Remove 2 screws from the electrical cover and remove the electrical cover 4 Remove 2 screws from the electrical box and pull the electrical box downward Temporarily secure the electrical box using 2 hooks in the back of electrical box b Disconnect the connector CN20 red from the indoor controller board 6 Remove the sensor holder from the electrical box and remove the thermistor from the holder Photo 4 Casing Room temperature thermistor TH1 Electrical box Removing the fan motor and right side fan 1 Remove the air intake grille See Figure 1 2 2 Remove the beam by removing screws See Photo 1 3 Remove 2 screws from the electrical cover and remove the electrical cover 4 Remove 2 screws from the electrical box and pull th
67. ormally from indoor unit of refrigerant address 0 for 3 minutes Error code EO Abnormal if sub remote controller could not receive any signal for 2 minutes Error code EO Abnormal if indoor controller board can Contact failure at transmission wire of remote controller All remote controllers are set as sub remote controller In this case EO is displayed on remote controller and E4 is displayed at LED LED1 LED2 on the outdoor controller circuit board Miswiring of remote controller Defective transmitting receiving circuit of remote controller Check disconnection or looseness of indoor unit or transmission wire of remote controller Set one of the remote controllers if there is no problem with the action above Check wiring of remote controller Total wiring length max 500m Do not use cable x 3 or more The number of connecting indoor units max 16 units The number of connecting remote control ler max 2 units When it is not the above mentioned problem of not receive any data normally from remote controller board or from other indoor controller board for 3 minutes Error code E4 Indoor controller board cannot receive any signal from remote controller for 2 minutes Error code E4 Defective transmitting receiving circuit of indoor controller board of refrigerant addresses 0 amp Noise has entered into the transmission wire of remote contr
68. oting of problems Continue to operate unit for the time being if the cause is not ascertained There is no abnormality concerning of parts such as electrical component controller board remote controller and etc 10 2 MALFUNCTION DIAGNOSIS METHOD BY REMOTE CONTROLLER lt case of trouble during operation gt When a malfunction occurs to air conditioner both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop lt Malfunction diagnosis method at maintenance service gt m Wireless remote controller Option Refrigerant MITSUBISHI ELECTRIC address display CHECK LAH display Temperature button ON OFF _ amp TEMP button FAN AUTOSTOP MODE VANE AUTOSTAR HOUR Sje button CHECK LOUVER h CHECK AT TEST RUN min button SET RESET 491 Procedure 1 Press the CHECK button twice 2 Press the temperature buttons 3 Point the remote controller at the sensor on the indoor unit and press the HOUR button 4 Point the remote controller at the sensor on the indoor unit and press the ON OFF button 22 CHECK lights and refrigerant address 00 flashes Check that the remote controller s display has stopped before continuing Select the refrigerant address of the indoor unit for the self diag
69. pply with sufficient capacity for exceptionally high demand conditions and the actual room temperature reaches set point the 2nd unit starts operation in conjunction with the 1st unit Once the actual room temperature goes down to 4 degrees C below set point the 2nd unit stops operation automatically set point set temperature by R C remote controller 4 6 8 selectable Number of operating units is determined according to the room temperature and set point When room temperature becomes higher than set point standby unit starts 2 units operation When room temperature falls below set point 4 C standby unit stops 1 unit operation OCH491B 37 System constraint This function is available only in cooling mode 2nd stage cut in function Request code number 322 Ex Set temp by R C 20 C Room temp lt Set point 4 C Set point 26 C i ES oom temp 2 Set poin When request code number is 323 Start operation Sub unit start operation Sub unit stop 26 2nd unit Cut in pens IC 1 4 degree 22 C 2nd unit Cut out e 20 C 11 1 2 How to set rotation function Back up function 2nd stage cut in function You can set these functions by wired remote controller Maintenance monitor NOTICE Both main and sub unit should be set in same setting Every time replacing indoor controller board for servicing t
70. rol system under which 2 or more outdoor units are connected set one of the units to O Set refrigerant address using SW1 3 6 on outdoor controller circuit board Phenomena Note Refer to the manual of outdoor unit for the detail of remote controller Cause Countermeasure 2 LED2 on indoor controller board is blinking When LED1 on indoor controller board is also blinking Connection failure of indoor outdoor unit connecting wire Check indoor outdoor unit connecting wire for connection failure When is lit Miswiring of remote controller wires Under twin triple indoor unit system 2 or more indoor units are wired together Refrigerant address for outdoor unit is wrong or not set Under grouping control system there are some units whose refrigerant address is O Short cut of remote controller wires Defective remote controller Check the connection of remote controller wires in case of twin triple indoor unit System When 2 or more indoor units are wired in one refrigerant system connect remote controller wires to one of those units Check the setting of refrigerant address in case of grouping control system If there are some units whose refrigerant addresses are 0 in one group set one of the units to 0 using SW1 3 6 on outdoor controller circuit board Remove remote controller wires and check LED2 on indoor controller board When LED2 is blink
71. s failed but all other components work properly if you set the switch SWE on the indoor controller board ON the indoor unit will begin emergency operation When emergency operation is activated the indoor unit operates as follows 1 Indoor fan is running at high speed 2 Drain pump is operating option Note on the wireless remote control when the remote control does not function it is possible to activate emergency operation by using the indoor unit emergency operation switch SW1 SW2 of the wireless signal receiver board However if the indoor unit microprocessor has failed it is necessary to proceed with points 2 and 3 below as in the case of the wired remote controller 2 When you activate emergency operation of the cooling or heating you have to set the switch SWE on the indoor controller board and activate emergency operation of the outdoor unit For details on how to activate emergency operation of the outdoor unit refer to the outdoor unit wiring diagram Note Emergency operation will not work unless outdoor unit is PU series 3 Before you activate emergency operation check the following points 1 Emergency operation cannot be activated when the outdoor unit malfunctions the indoor fan malfunctions when it has detected the malfunction of drain pump during self diagnosing 2 Emergency operation becomes continuous only by switching the power source on off ON OFF on the remote control or temperature contr
72. ss the button 2 Select Service with the Cursor buttons and F4 and press the button Fi F2 and or the Page buttons Q Enter the current maintenance password 4 numerical digits Move cursor to the digit you wat to change with the Set each number 0 through 9 with the or F2 button F3 or button F4 Note The initial maintenance password is 9999 Then press the button Select Check with the 1 or F2 Select Request code with the button and press the button F1 or F2 button and press the button Set the Refrigerant address and Request code Select the item to be changed with the F2 or button Select the required setting with the or F4 button Press the 9 Press the F3 F3 or or F4 button to set the Refrigerant address 0 F4 button to set the desired request code No Rotation amp Back up operation Please match request code with 311 318 either 2nd stage cut in operation Please match request code with 321 324 either Press the 2 button Data will be collected and displayed 7 Press the or button to set the Refrigerant address 1 Please set above 0 To return to the Main menu press the button PAR 21MAA
73. t mm 9215 0884 0 088918 aadis 99 02460 O 2960 490 Jails 9215 edid ejgejie y iun Joopino jo ezis edid eui synu jueuno eui 955 Ajuo edid sued uondo eui Buij ejsur ueuw euns eq 42 104 JOYOUL 10 M9J9S 8 EM JO OLW 95 71 SALON 31 uid 199905 ueuMw 88512 seb _ 9620 98 28 86 9 7 089 jejjno aiv 062 8 88 78 ooz 202 g 081 641 v PCA RP60 71 PCA RP60 71KAQR1 exelur v 8 99 Inu ae 92 q 1 19205 ure1q uosseooy 920 2 104 3no490Ux 220 2 3no490Ux 0019 6 10 edid saddn 10 jnoyoouy uonoeuuoo edid pinbij uonoeuuoo uonoeuuoo pajejy
74. te Please be aware that there might be some drainage left in the drain pan when you remove the drain pan Photo 17 Screw with washer 2 locations OCH491B Photo 15 Pipe cover fixing screws Drain pan fixing screws left and right Drain pan each 1 screw Photo 16 Insulations 44 OPERATING PROCEDURE PHOTOS amp ILLUSTRATIONS 10 Removing the thermistors Liquid pipe TH2 and con denser evaporator TH5 1 Remove the air intake grille See Figure 1 2 2 Remove the left and right side panels See Figure 3 4 3 Remove the under panel See Photo 14 4 Remove the drain pan See Photo 15 16 17 5 Disconnect the connector CN44 white from the indoor controller board 6 Remove 6 screws from the pipe cover and remove the pipe cover See Photo 15 18 Photo 18 Pipe cover fixing screws Pipe cover fix ing screws See Photo 15 7 Remove the fastener for wires and remove the thermistors TH2 and 5 from each holder See Photo 19 REE cover EAM Pipe cover gt Photo 19 Condenser evaporator tepmertature thermistor TH5 Fastener Liquid pipe temperature thermistor TH2 11 Removing the guide vane Photo 20 1 Remove the intake grille See Figure 1 2 2 Remove the side panel right and left See Figure 3 4 3 Remove the under panel See Photo 14 4 Remove the drain pan See Photo 15 16 17
75. tester Winding temperature 20 C Abnormal Open or short Normal 2900 Drain float switch FS Moving part 1 2 3 4 10 6 1 Thermistor Measure the resistance between the terminals with a tester itch Abnormal Other than short Other than open State of moving part Normal UP Short DOWN Open Moving part lt Thermistor Characteristic graph gt 50 Thermistor for lower temperature Room temperature thermistor TH1 Pipe temperature thermistor liquid TH2 Thermistor Ro 15kQ 3 Fixed number of B 3480 2 Rt 15exp 3480 15kQ 10 9 6kQ 20 C 6 3kQ 25 C 5 4kQ 30 C 4 3kQ 40 C 3 0kQ thermistor TH5 40 g 30 5 1 1 20 2734 273 10 Condenser evaporator temperature 20 10 0 OCH491B 33 lt Thermistor for lower temperature gt 10 20 30 40 50 Temperature 10 6 2 DC Fan motor fan motor indoor controller circuit board Check method of DC fan motor fan motor indoor controller circuit board Notes High voltage is applied to the connecter for the fan motor Pay attention to the service Do not pull out the connector CNMF for the motor with the power supply on It causes trouble of the indoor controller circuit board and fan motor Self check Symptom The indoor fan cannot turn around Wiring contact
76. w protection operation Suspensive abnormality if drain float switch is detected to be underwater for 1 minute and 30 seconds continuously with drain pump on Compressor and indoor fan will be turned off Drain pump is abnormal if the condition above is detected during suspensive abnormality Constantly detected during drain pump operation OCH491B C Malfunction of drain pump Defective drain Clogged drain pump Clogged drain pipe 9 Defective drain float switch Catch of drain float switch or malfunction of moving parts cause drain float switch to be detected under water Switch On Defective indoor controller board 25 D Check if pump operates Check drain function 9 Remove drain float switch connector CN4F and check if it is short Switch On with the moving part of float switch UP or OPEN with the moving part of float switch down Replace float switch if it is short with the moving part of float switch down Replace indoor controller board if it is short circuited between of the drain float switch connector CN4F and abnormality reappears It is not abnormal if there is no problem about the above mentioned Turn the power off and on again to operate after check Error Code Abnormal point and detection method Cause Countermeasure Freezing overheating protection is operating Freezing protection Cooling mode The unit is in 6 minute resume
77. wireless remote controller Wireless remote Control PCB setting controller setting J41 J42 O x lt lnitial setting gt Wireless remote controller 0 Control PCB for both J41 and J42 Four pair number settings are supported The pair number settings of the wireless remote controller and indoor control PCB J41 J42 are given in the table on the left in the table indicates the jumper line is disco nnected Unit type setting Model JP1 Without TH5 With TH5 There is no jumper 1 because these models have the cond eva temperature thermistor 5 Indoor controller board type setting OCH491B Indoor controller board type For product Service parts 36 11 SPECIAL FUNCTION 11 1 ROTATION FUNCTION AND BACK UP FUNCTION 2ND STAGE CUT IN FUNCTION 11 1 1 Operation 1 Rotation function and Back up function Outline of functions Main and sub unit operate alternately according to the interval of rotation setting Main and sub unit should be set by refrigerant address Outdoor Dip switch setting Refrigerant address 00 gt Main unit Refrigerant address 01 Sub unit When error occurs to one unit another unit will start operation Back up function System constraint This function is available only by the grouping control system IND
78. y secure the electrical box using 2 hooks in the back of electrical box 5 Remove 4 screws from the fan guard of the fan motor See Photo 5 6 Remove 2 screws from the left side beam and remove the beam See Photo 1 7 Remove the 3 screws from center fan guard and remove the fan guard 2 screws See Photo 9 1 screw Drain pan side 8 Remove 2 screws from the left fan guard and remove the fan guard See Photo 10 9 Loosen 2 set screws 2 hexagon set screws of connect ing joint See Photo 5 10 Remove 3 lower casings while pressing each 4 catches of the casing 11 Remove the 4 screws from the bearing support See Photo 11 12 Slide the connecting joint to the left and remove the fans and shaft together See Photo 12 13 Remove the fan from the shaft See Photo 7 8 Fan guard Fan guard fixing screws Electrical box Photo 10 Fan guard fixing screws Photo 12 Fans 3 connection Photo 11 Bearing sup port fixing screws Bearing support Shaft 6 Removing the side panel Figure 3 1 Remove the air intake grille See Figure 1 2 2 Remove the screws from the side panel and remove the side panel by sliding the panel to the front 3 Unhook the side panel support hanger and then slide the side panel forward to remove it Figure4 omn le Hole for side panel N support hanger Side panel support hanger OCH491B 43

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