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Carrier 50VL---A Air Conditioner User Manual

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2. A11010 Fig 13 Connection Wiring Diagram 208 230 3 60 19 LADDER WIRING DIAGRAM L2j 11 13 BLK pu YEL IF USED CCH UE 0 8LK e 8LK 13 GRN BLK IF USED IF USED BRN om BLU ne 11 COMB 11 BLK YEL Q13 Li GIY rh 230 TRAN COM O BLK O 13 RED SEE NOTE GIy BRN C IFB rh R O RED mac O BRN Y1O YEL 6 O GRN 2140 6 DHO BLU Soy Yo W2 O WHT 62 BT 10 ILI wa Y2 GR 7 gt P2 20 2 30 P2 40 5 LPS C1 C2 m m L O4 O8L K e BLU O BLU O O BRV OQC TRAN LC AC TFB P4 1O BR i 48RN 4 20 2 1 2 BRN SUL lyro HARNESS 24530 10445 BRN P4 4O EPNK BRN 4 13 y 4 P4 5O IK GRY BRN 6 I PNK 6 8LU 50 OF in BLU 8 DEHUMLO ap C SEE NOTE 4 ED BRN ORN BLK GRY NOTE 8 RED YEL GRY SOVLS00270
3. ya qu X NYO 18 R RED M OM E I HIGH BRN ACCESSORY ELECTRIC HEATER ELECTRIC HEAT CONNECTOR _ _ E _ _ Tl 4 HRI 5 907a GRN IFB E HHT RO BRN DH m voie lio ARAO W2 WHT HRI 8 2 10 wa 1 RAO BRN HR1 2 83 15 m gt W3 VI0 o gt 09228 Lory E ____ 6216 rh 3 P Y2 86RY TSTAT SEE NOTE 7 STD DEHUM Yt YEL 4 G Y HPS LPS BLK e BLK BLK e BLU BLU ace UNIT COMPONENT ARRANGEMEN LEGEND C CONTACTOR OUTDOOR FAN OFM L FIELD SPLICE CAP CAPACITOR SECTION COLOR CODE CO TERMINAL MARKED ENERGIZED CCH CRANK CASE HEATER BLK BLACK TERMINAL UNMARKED COMP COMPRESSOR MOTOR DH DEHUMIDIFICATION MODE DEHUM DEHUMIDIFI
4. eme 4 3 4 30 0 C RJO P4 40 Pu Le Lo OfR2O GRY scie X BRN 11 yp ae ow SIDIO BLU 1 2 DEHUMLO SEE NOTE 4 prp 3 BRN een ORN 4 BLK 5 SEE NOTE 8 BRN 50VL500269 11003 Fig 12 Cont Ladder Wiring Diagram 208 230 1 60 18 CONNECTION WIRING DIAGRAM DANGER ELECIRICAL SHOCK HAZARD DISCONNECI POWER BEFORE SERVICING y 0 SCHEMATIC ae 230 3 60 FIELD 177 SUPPLY BLK IF USED POWER f 5 OFM BLK BLK BLK UNIT ONLY IF USED FOR WIRING MAXIMUM WIRE L3 N WITH ELECTRIC SIZE 2 AWG gt fon TH YEL m YEL HEATERS SEE 7 SCHEMATIC I 8RN e 8RN 77 ON HEATER 1 COMPRESSOR PLUG IF USED p ACCESSORY IT te s BLU YEL 4 COMP EQUIP GND YEL 40 BLK BLU HCZ YEL ECON BLK N PLUG GRN YEL ru GND P NK BLU 1 L 777 Low nes 09 IFM Ee GRN YEL BLK o 4 RN 12345 GRY TRAN SEE NOTE 5 amp 6 RED BRN BRN BRN RED 12 YEL c 2 SEE NOTE 8 SEE NOTE 4
5. MPAA 6 AQL 2 2 T 5 2 81 1 2 91 810 800 0 0052 0061 2 _ 0 2 91 0 LEO oro 600 800 400 0081 0021 0 p 2 2 LXOZXZ L LXOZXZ L 810 vio 600 800 400 800 001 009 0022 0012 0002 0061 008 0021 0091 0081 0071 0051 0021 0011 0001 006 008 002 009 SNOL 426 W49 5 ul 3716 ND 21981 Inssad IA MOYUMOG pue 1461 020 ZVO Sro 08 Mb 3 8 7 _ _ _ _ E 5 vm LXveX9 L 220 610 20 SVO 2 0 Ov O08 008 L E _ l y 3 5 0 1 LXOZXZ L 0 150 520 120 20 vVO 0 0 800 100 20 OOP 1 009 0022 0012 0002 0061 0081 0041 0091 0091 OOPL 0051 0021 OOLL 0004 006 008 007 009 SNOL H3ZINONOO3 405 W49 auvaNvis ND 2unssoaq pue 7 L CIM ND 98 MOYUMOG pue 9 AQEL 16 C
6. IN mm Small CPRFCURBO10A00 279 u 10 254 822 30 6 778 Large CPRFCURBO11A00 856 16 CPRFCURBO12A00 208 1214 69 ae Large e 14 356 aie 42 2 1072 CPRFCURBO013A00 856 Part Numbers CPRCURBO 10A00 and CPRCURBO 1A00 can be used on both small and large basepan units The cross supports must be located based on whether the unit is a small basepan or a large basepan NOTES 1 Roof curb must be set up for unit being installed 2 Seal strip must be applied as required to unit being installed 3 Roof curb is made of 16 gauge steel 4 Attach ductwork to curb flanges of duct rest on curb 5 Insulated panels 1 in 25 4 mm thick fiberglass 1 Ib density Fig 4 Roof Curb Dimensions CAUTION NOTICE TO RIGGERS PRUDENCE AVIS AUX MANIPULATEUR ACCESS PANELS MUST BE IN PLACE WHEN RIGGING PANNEAUX D ACCES DOIT ETRE EN PLACE POUR MANIPULATION Use top skid as spreader bar Utiliser la palette du haut comme barre de r partition MINIMUM HEIGHT 36 914 4 mm HAUTEUR MINIMUM SEAL STRIP MUST BE IN BANDE SCELLANT DOIT TRE PLACE BEFORE PLACING EN PLACE AVANT DE PLACER UNIT HEIGHT HAUTEUR D UNIT UNIT ON ROOF CURB L UNITE SUR LA BASE DE TOIT DETAIL A VOIR D TAIL VOIRDETAIEA 50CY502286 2 0 A09051 SMALL CABINET LARGE CABINET 24 30 36 42 48 60 it Uni Ib kg Ib kg
7. ay 1 0 Buisues e Aq aul ay eunseoyy Z e ay e Burqoege Aq ainssaid ainseay 8Inps501g SL vb V8 SL 9 8 SL 76570 HOEM pe 97 SLL Lp SOL ainssald 9215 2 4 94nje1eduie 5 09089 Fig 15 Cooling Charging Chart 23 MAINTENANCE To ensure continuing high performance and to minimize the possibility of premature equipment failure periodic maintenance must be performed on this equipment This cooling unit should be inspected at least once each year by a qualified service person troubleshoot unit refer to Table 8 Troubleshooting Chart NOTE TO EQUIPMENT OWNER Consult your local dealer about the availability of a maintenance contract 4 WARNING PERSONAL HAZARD INJURY AND UNIT DAMAGE Failure to follow this warning could result in personal injury or death and possible unit component damage The ability to properly perform maintenance this equipment requires certain expertise mechanical skills tools and equipment If you do not possess these do not attempt to perform any maintenance on this equipment other than those procedures recommended in the Owner s Manual WARNI
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9. Reset Auto 420 25 LOSS OF CHARGE LOW PRES 20 5 SURE SWITCH Liquid Line psig 45 4 10 cut out Reset auto RETURN AIR 5 Throwaway Size in 20x20x1 20x24x1 24x30x1 24x36x1 Throwaway Size mm 508x508x25 508x610x25 610x762x25 610x914x25 For 460 volt units add 14 Ib 6 35 kg to the shipping weight t Required filter sizes shown are based on the larger of the AHRI Air Conditioning Heating and Refrigeration Institute rated cooling airflow or the heating air flow velocity of 300 ft minute for throwaway type or 450 ft minute for high capacity type Air filter pressure drop for non standard filters must not exceed 0 08 t If using accessory filter rack refer to the filter rack installation instructions for correct filter sizes and quantity Table 2 Minimum Airflow for Safe Electric Heater Operation CFM SIZE 24 30 36 42 48 60 1750 800 1000 1200 1400 1600 11 PRE START UP WARNING ENVIRONMENTAL FIRE ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death and or property damage EXPLOSION 1 Follow recognized safety practices and wear protective goggles when checking or servicing refrigerant system Relieve and recover all refrigerant from system before touching or disturbing compressor plug if refrigerant leak is suspected around
10. 6 9 5 789 22 158 176 peu vew 1A0S 169 929 LLL 198 Ul 059 792 MERI ng wo 60 0 90 50 v0 0 20 EX ACND added S VIS HO102 SHIM 9334 15 09 1 0 HUN 2 1 p AQEL 9 0 70 0 0 0 600 800 400 900 800 700 600 290 0 00 600 800 400 900 900 700 500 200 000 SL 2 0 0 0 600 800 400 900 800 700 600 200 10 0 00 0 000 OL 2 0 010 60 0 80 0 20 0 90 0 500 00 800 200 100 000 000 000 MAS 0022 0012 0002 0061 0081 0021 0091 0091 00 0051 0021 vis 1405 NAD auvaNvis 09 610 4170 810 LEO 600 800 900 00 200 000 000 810 9 0 2 0 0 0 800 900 00 200 000 000 000 SL LEO 010 60 0 20 0 90 0 v0 O 200 000 000 000 000 000 OL 400 900 00 200 000 000 000 000 000 000 000 000 MAS 0091 0091 0071 0051 0021 0011 0001 006 008 00 009 008 Sve 1405 1 9 ND SALL
11. 5 RED 8 659 ACCESSORY ELECTRIC HEAT ao ADDED BRN 5 WHT HRI 5 EC DE n YEL 2 IFB DH BLU x 2 WHT T ms ain HR1 2 8 3 15 KW D i H See 10522 gt HPS LPS BL BLK s u 0 810 UNIT COMPONENT ARRANGEMENT LEGEND FIELD SPLICE CAP CAPACITOR SECTION COLOR CODE TERMINAL MARKED ENERGIZED m ME HEATER BLK BLACK Q TERMINAL CUNHARKED DH DEHUMIDIFICATION MODE BLU BLUE 9 SEL IEE LIE USED DEHUM DEHUMIDIFI ATION MODE BRN BROWN SPLICE MARKED DEUM DEHUMID ET FACTORY WIRING COMPRESSOR INDOOR FAN CONTROL BOK AREA GRN GREEN FIELD CONTROL WIRING PS PRESSURE SWITCH n ORN ORANGE POWER WIRING HR HEATER RELAY MEL LEES NE LPS SINGLE PT 23 13 VIO VIOLET RING LPS LOW PRESSURE SWITCH CONNECTION WHT WHITE TO INDICATE COMMON OFM OUTDOOR PAN MOTOR FOR YEL YELLOW POTENTIAL ONLY STD STANDARD MODE ELECT HEAT NOT TO REPRESENT WIRING TRAN TRANSFORMER HPS m NOTES TRAN 1 IF ANY OF THE ORIGINAL WIRES FURNISHED ARE REPLACED IT MUST REPLACED WITH TYPE 90 DEGREE C WIRE OR 117 EQUIVALENT 2 SEE PRICE PAGES FOR THERMOSTAT AND SUBBASES COMP EQUIP 3 USE 15 DEGREE COPPER CONDUCTORS FOR FIELD INSTALLATION 4 REFER TO INSTALLATION INSTRUCTIONS GND FOR CORRECT SPEED SELECTION OF IFN SEE HEATER 5 RELOCATION OF SPEED TAPS MAY BE REQUI
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13. 50VL A Performance 14 SEER Single Packaged Air Conditioner System with R 410A Refrigerant Single and Three Phase 2 5 Nominal Tons Sizes 24 60 turn to the experts fH Installation Instructions NOTE Read the entire instruction manual before starting the installation NOTE Installer Make sure the Owner s Manual and Service Instructions are left with the unit after installation TABLE OF CONTENTS PAGE SAFETY CONSIDERATIONS 1 2 INTRODUCTION 2 IRI RR 4 44 4 2 RECEIVING AND INSTALLATION 2 10 Check Equipment 2 Identity Unit eser REDDERET p en ex ORE 2 Inspect Shipment 342 54 a 2 Provide Unit Support 2 Roof Curb as etes dove teense 2 Slab Mount er ERU ES ERI ws 2 Provide Clearances 2 2 4 ee m Re ikay 7 Field Fabricate Ductwork 7 Rig and Place Unit eR en 7 Inspection bias eee deri eet eae ens 7 Rigging Lifting of Unit 7 Connect Condensate Drain 8 Install Duct Connections 8 Configuring Units for Downflow Vertical Discharge 8 Install Electrical Connections 9 High Voltage Connections 9 Special Procedures for 208v Opera
14. A11009 Fig 13 Cont Ladder Wiring Diagram 208 230 3 60 20 CONNECTION WIRING DIAGRAM mm SCHEMATIC s c 4 6 0 7 3 di 6 0 FIELD ee RED FOR WIRING WITH Z4 77777 SUPPLY BLK ELECTRIC HEATERS mE SEE SCHEMATIC 5520 naupo B BLK BLK OFM ON HEATER A MAXIMUM WIRE L3 LN ACCESSORY AZ 022 4 YEL F3 YEL YEL SIZE 2 Ns I 8RN OMPRESSOR PLUG TY i ei Biy YEL EQUIP GND le 2 FUI 5 AMPLBLK BLUE 4 abi NOTE 8 EUR E EE ECON BLK EL PLUG e GND GRN YEL GND ECON rh T N I cou Ero i r9 e BLK a 230V GRN YEL BEN lt S sulud 12345 5 gt GRY 2 SEE NOTE 5 8 6 3 3 4 BRN 1 1 YEL ss 12 712 YEL o mmm BLK BRN BRN c B 2 k bos RED SEE NOTE 4 12 GRY TSTAT SEE NOTE 7 26 NOTE 9
15. Morris St Indianapolis IN 46231 Edition Date 01 11 Catalog No 50VL 08SI Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations Replaces 50 1 0781 30
16. NK EON Sh ELECTRIC HEATER TEE E 5 o o S CONNECTOR ELECTRIC HEAT 52 o 1 in LE BRN e BRN HRI 5 KW rh 6 GRN 4 IFB WHT e 8RN 4 DH BLU 4 HR1 2 3 8 4 20 KW 3 we WHT VIO 3110 BRN 1 HRI 82 10 KW 4 PNK e BRN VIO 4 x peus WR1 2 83 15 028222 GRY Lory BRN HPS LPS BLU 8K oT 0 8LK BLU LU UNIT COMPONENT ARRANGEMENT LN FIELD SPLICE C CONTACTOR OUTDOOR TERMINAL MARKED ENERGIZED CAP CAPACITOR OFM TERMINAL UNMARKED MD OR SPLICE IF USED SPLICE MARKED DEHUN DEHUNIDIFICATZON MODE COMPRESSOR INDOOR FAN CONTROL BOX AREA FACTORY WIRING HPS HIGH PRESSURE SWITCH SECTION SECTION FIELD CONTROL WIRING HR HEATER RELAY FIELD POWER WIRING SINGLE ACCESSORY OR OPTIONAL IFB INTERFACE BOARD CONRECTION WIRING INDOOR FAN MOTOR LPS FOR LPS LOW PRESSURE SWITCH TO INDICATE COMMON ELECT HEAT POTENTIAL ONLY OFM OUTDOOR FAN MOTOR HPS NOT TO REPRESENT WIRING STD STANDARD TRAN TRAN TRANSFORMER HC F NOTES COMP eis 1 IF ANY OF THE ORIGINAL WIRES FURNISHED ARE REPLACED IT MUST BE REPLACED WITH TYPE 90 DEGREE C WIRE OR i LENT SEE HEATER 2 SEE PRICE PAGES FOR THERMOSTAT AND SUBBASES SCHEMATIC 3 USE 75 DEGREE COPPER CONDUCTORS FOR FIELD INSTALLATION FOR WIRING
17. unit 1 Remove 6 screws holding condenser grille and motor to top cover 2 Turn motor grille assembly upside down on top cover to expose the fan blade 3 Inspect the fan blades for cracks or bends 4 If fan needs to be removed loosen setscrew and slide the fan off the motor shaft 5 When replacing fan blade position blade as shown in Fig 16 6 Ensure that setscrew engages the flat area on the motor shaft when tightening 7 Replace grille Electrical Controls and Wiring Inspect and check the electrical controls and wiring annually Be sure to turn off the electrical power to the unit Remove access panels see Fig 17 to locate all the electrical controls and wiring Check all electrical connections for tightness Tighten all screw connections If any smoky or burned connections are noticed disassemble the connection clean all the parts restrip the wire end and reassemble the connection properly and securely After inspecting the electrical controls and wiring replace the access panels see Fig 17 Start the unit and observe at least one complete heating cycle and one complete cooling cycle to ensure proper operation If discrepancies are observed in either or both operating cycles or if a suspected malfunction has occurred check 25 each electrical component with proper electrical instrumentation Refer to the unit wiring label when making these checkouts NOTE Refer to the heating and
18. 1 in 25 mm lower than the drain pan condensate connection to prevent the pan from overflowing See Fig 8 When using a gravel apron make sure it slopes away from the unit Connect a drain tube using a minimum of 3 4 in PVC or 3 4 copper pipe all field supplied at the outlet end of the 2 in 51 mm trap Do not undersize the tube Pitch the drain tube downward at a slope of at least 1 in 25 mm for every 10 ft 3 1 m of horizontal run Be sure to check the drain tube for leaks Prime trap at the beginning of the cooling season start up OUTLET l in 25 mm min i 2 in 51 mm min 09052 Fig 8 Condensate Trap Step 7 Install Duct Connections The design and installation of the duct system must be in accordance with the standards of the NFPA for installation of non residence type air conditioning and ventilating systems NFPA 90A or residence type NFPA 90B and or local codes and ordinances Select and size ductwork supply air registers and return air grilles according to ASHRAE American Society of Heating Refrigeration and Air Conditioning Engineers recommendations The unit has duct flanges on the supply and return air openings on the side of the unit When designing and installing ductwork consider the following 1 All units should have field supplied filters or accessory filter rack installed in the return air side of the unit Rec
19. DISCONNECT 4 REFER TO INSTALLATION INSTRUCTIONS 5 PER NEC FOR CORRECT SPEED SELECTION OF IFM CCH 5 RELOCATION OF SPEED TAPS MAY REQUIRED a SS WHEN USING FIELD INSTALLED ELECTRIC HEATERS 24V SPLICE CONSULT INSTALLATION INSTRUCTIONS TO BOX 24V POWER ENTRY DETERMINE CORRECT SPEED TAP SETTING 6 DO NOT DISCONNECT PLUG UNDER LOAD 1 THIS FUSE IS MANUFACTURED BY LITTELFUSE P N 257003 8 UNIT FACTORY SHIPPED IN STD MODE A11004 Fig 12 Connection Wiring Diagram 208 230 1 60 17 LADDER WIRING DIAGRAM DANGER ELECTRICAL SHOCK HAZARD DISCONNECT POWER BEFORE SERVICING L1 L2 BLK zn YEL 11 BLI IF USED amp i 23 BLK BLI Om L 5 7 ae YEL IF USED 8L 11 BLK YEL O23 ENS IFM 77 230 TRAN O BLK 23 RED 9 RED 24VAC A Fuse gt 3A R O RED C O BRN 4 Y O YEL 130 DH O BL P1739 W2 O WHE 10 Eito 2 10 P2 20 P2 30 P2 40 Y 5 LPS 1 62 BLU O O 8LU C BR C TRAN ACCESSORY ELECTRIC HEATER ELECTRIC HEAT CONNECTOR EV po ELS 45154 P4 10 4 20
20. Ib kg Unit Ib kg Ib kg Ib kg Rigging Rigging bre 295 134 307 139 365 166 421 191 439 199 467 212 For 460 units 14 Ib 6 35 kg to the rigging weight NOTE See dimensional drawing for corner weighs Fig 5 50VL A Unit Suggested Rigging Step 3 Provide Clearances The required minimum service clearances are shown Fig 2 and 3 Adequate ventilation and outdoor air must be provided The outdoor fan draws air through the outdoor coil and discharges it through the top fan grille Be sure that the fan discharge does not recirculate to the outdoor coil Do not locate the unit in either a corner or under an overhead obstruction The minimum clearance under a partial overhang such as a normal house overhang is 48 in 1219 mm above the unit top The maximum horizontal extension of a partial overhang must not exceed 48 in 1219 mm IMPORTANT Do not restrict outdoor airflow An air restriction at either the outdoor air inlet or the fan discharge may be detrimental to compressor life Do not place the unit where water ice or snow from an overhang or roof will damage or flood the unit Do not install the unit on carpeting or other combustible materials Slab mounted units should be at least 4 in 102 mm above the highest expected water and runoff levels Do not use unit if it has been under water Step 4 Field Fabricate Ductwork Secure all ducts to roof cu
21. V TA0S 306 NOU 3015 1487 1079221 1178281 91 8 87 8 6 2 E 526 2 Jo C 1 i E 9625 7 12261 uml T f 9 AYINI 83004 E WI EG PY v 1 1 SS SSS BS SSS TANVd 13NVd 43Af01 TANWd 43A001 IE 1 vs 832 23 1412 3 5301140 Q3TWISNI AYOLOVS TV 803 INVA3138 VIVO 318V1 17 310N 219 610 92 097 1105 0769 0792 0521902 1106 v Y Fi 0521902 1106 1792 v Ls 062 808 105 als 3901 10 9 V TAOS 140 1106 1106 I MLIAVUS 10 831832 10768111 91 1 9v 901 1102 gt as 2 ay 1717 91 6 12 9 1272611 9 A09462 Fig 2 50VL A24 36 Unit Dimensions 09463
22. airflow Puron Items The indoor metering device is a TXV type device Pressure Switches Pressure switches are protective devices wired into the control circuit low voltage They shut off compressor if abnormally high or low pressures are present in the refrigeration circuit These pressure switches are specifically designed to operate with Puron R 410A systems R 22 pressure switches must not be used as replacements for the Puron 410 air conditioner Loss of Charge Low Pressure Switch Air Conditioner Onl This switch is located on the liquid line and protects against low suction pressures caused by such events as loss of charge low airflow across indoor coil dirty filters etc It opens on a pressure drop at about 20 psig 957 Pa If system pressure is above this switch should be closed To check switch 1 Turn off all power to unit 2 Disconnect leads on switch 3 Apply ohmmeter leads across switch You should have continuity on a good switch NOTE Because these switches are attached to refrigeration system under pressure it is not advisable to remove this device for troubleshooting unless you are reasonably certain that a problem exists If switch must be removed remove and recover all system charge so that pressure gauges read 0 psi 0 Pa Never open system without breaking vacuum with dry nitrogen High Pressure Switch The high pressure switch is located in the discharge line and protects against excess
23. atmosphere while it is under a vacuum When system must be opened for service break vacuum with dry nitrogen and replace filter driers Always replace filter drier after opening system for service Do not vent Puron into the atmosphere Observe all warnings cautions and bold text Do not leave Puron suction line driers in place for more than 72 hrs 29 START UP CHECKLIST Remove and Store in Job Files I PRELIMINARY INFORMATION MODEL NO SERIAL NO DATE TECHNICIAN II PRESTART UP Insert check mark in box as each item is completed VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT REMOVE ALL SHIPPING HOLD DOWN BOLTS AND BRACKETS PER INSTALLATION INSTRUCTIONS CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS CHECK THAT INDOOR EVAPORATOR AIR FILTER IS CLEAN AND IN PLACE VERIFY THAT UNIT INSTALLATION IS LEVEL CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING ORIFICE AND SETSCREW TIGHTNESS START UP ELECTRICAL SUPPLY VOLTAGE COMPRESSOR AMPS INDOOR EVAPORATOR FAN AMPS TEMPERATURES OUTDOOR CONDENSER AIR TEMPERATURE DB RETURN AIR TEMPERATURE DB WB COOLING SUPPLY AIR DB WB PRESSURES REFRIGERANT SUCTION PSIG SUCTION LINE TEMP REFRIGERANT DISCHARGE PSIG LIQUID TEMPT VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS Measured at suction inlet to compressor t Measured liquid line leaving condenser Copyright 2011 Carrier Corp 7310
24. base units must be secured to common curb before allowing full weight of unit to rest on curb Install screws through curb into unit base rails while rigging crane is still supporting unit Lifting holes are provided in base rails as shown 1 Attach shackles clevis pins and straps to the base rails of the unit Be sure materials are rated to hold the weight of the unit See Fig 5 2 Attach a clevis of sufficient strength in the middle of the straps Adjust the clevis location to ensure unit is lifted level with the ground After the unit is placed on the roof curb or mounting pad remove the top skid Ati SUPPLY COIL COND 07926 Fig 7 Slab Mounting Detail Step 6 Connect Condensate Drain NOTE When installing condensate drain connection be sure to comply with local codes and restrictions Model 50VL A disposes of condensate water through a 3 4 in NPT fitting which exits through the base on the evaporator coil access side See Fig 2 and 3 for location Condensate water can be drained directly onto the roof in rooftop installations where permitted or onto a gravel apron in ground level installations Install a field supplied 2 in 51 mm condensate trap at end of condensate connection to ensure proper drainage Make sure that the outlet of the trap is at least
25. compressor terminals Never attempt to repair soldered connection while refrigerant system is under pressure Do not use torch to remove any component System contains oil and refrigerant under pressure To remove a component wear protective goggles and proceed as follows Shut off electrical power to unit and install lockout tag Relieve and reclaim all refrigerant from system using both high and low pressure ports Cut component connecting tubing with tubing cutter and remove component from unit Carefully unsweat remaining tubing stubs when necessary Oil can ignite when exposed to torch flame Proceed as follows to inspect and prepare the unit for initial start up 1 Remove all access panels see Fig 17 2 Read and follow instructions on all DANGER WARNING CAUTION and INFORMATION labels attached to shipped with unit 3 Make the following inspections a Inspect for shipping and handling damages such as broken lines loose parts disconnected wires etc b Inspect for oil at all refrigerant tubing connections and on unit base Detecting oil generally indicates a refrigerant leak Leak test all refrigerant tubing connections using electronic leak detector or liquid soap solution If a refrigerant leak is detected see following Check for Refrigerant Leaks section c Inspect all field and factory wiring connections sure that connections are completed and tight d Ensure wir
26. fan runs Faulty wiring or circuit Loose connections in compressor Check wiring and repair or replace Compressor motor burned out seized or internal overload open Determine cause Replace compressor Defective run capacitor overload or PTC positive temperature coefficient thermistor Determine cause and replace One leg of 3 phase power dead Replace fuse or reset circuit breaker Determine cause Low input voltage Determine cause and correct Three phase scroll compressor size 30 60 unit has a low pressure differential Scroll compressor is rotating in the wrong direction Correct the direction of rotation by reversing the 3 phase power leads to the unit Compressor cycles other than normally satisfying cooling heating calls Refrigerant overcharge or undercharge Recover refrigerant evacuate system and re charge to capacities shown on rating plate Defective compressor Replace and determine cause Insufficient line voltage Determine cause and correct Blocked outdoor coil Determine cause and correct Defective run start capacitor overload or start relay Determine cause and replace Faulty outdoor fan motor or capacitor Replace Restriction in refrigerant system Locate restriction and remove Compressor operates continuously Dirty air filter Replace filter Unit undersized for load Decrease load or increase unit size Thermo
27. inside of the compressor access panel see Fig 17 The chart includes the required liquid line temperature at given discharge line pressures and outdoor ambient temperatures An accurate thermocouple or thermistor type thermometer and a gauge manifold are required when using the subcooling charging method for evaluating the unit charge Do not use mercury or small dial type thermometers because they are not adequate for this type of measurement NOTE Allow system to operate for a minimum of 15 minutes before checking or adjusting refrigerant charge IMPORTANT When evaluating the refrigerant charge an indicated adjustment to the specified factory charge must always be very minimal If a substantial adjustment is indicated an abnormal condition exists somewhere in the cooling system such as insufficient airflow across either coil or both coils 12 Proceed as follows 1 Remove caps from low and high pressure service fittings 2 Using hoses with valve core depressors attach low and high pressure gauge hoses to low and high pressure service fittings respectively 3 Start unit and let run until system pressures stabilize 4 Measure and record the following a Outdoor ambient air temperature F db b Liquid line temperature F at c Discharge high side pressure psig d Suction low side pressure psig for reference only 5 Using Cooling Charging Charts compare outdoor air temperat
28. on the interface board 5 Refer to airflow tables Table 4 to determine allowable speeds for the dehumidification cooling fan speed In Table 4 speeds that are not allowed for dehumidification cooling are shaded 6 Remove the vinyl cap off of the desired speed tap wire Refer to Table 3 for color coding for the dehumidification cooling fan speed and place desired speed tap wire on the LOW connection on the interface board IFB Verify that static pressure is in the acceptable range for the speed tap to be used for dehumidification cooling 7 Use any spare vinyl plugs to cap any unused speed tap wires 13 DCR QCR CACA 1300 00008 at 0 19906 i A7 R9 AB iS ET JW5 R5 R6 P2 l RWY C Jw4 Pi Y2 NT W2 DHG y Fig 11 Interface Fan Board IFB A09059 SINGLE SPEED COOLING WITH HIGHER ELECTRIC HEAT SPEED This unit can also be configured to operate with single speed cooling and a higher speed for an accessory electric heater 1 Using Fig 11 move the two pin DEHUM jumper from the STD position to the DEHUM position 2 See Table 2 for minimum airflow for electric heat operation Add electric heater and filter pressure drop to duct system static pressure to determine total external static pressure 3 Select speed tap from Table 4 that will achieve required airflow from Table 2 4 Remove the vinyl cap off of the desired
29. speed tap wire Refer to Table 3 for color coding 5 Connect the desired speed tap wire to the HIGH terminal on the interface fan board IFB CAUTION UNIT OPERATION HAZARD Failure to follow this caution may result in unit component damage or improper operation To use this mode a speed connection must be made on the HIGH terminal that meets or exceeds the minimum airflow found in Table 2 Table 3 Color Coding for Indoor Fan Motor Leads Black High Speed Orange Med High Speed Red Med Speed Pink Med Low Speed Blue Low Speed A WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death Disconnect electrical power to the unit and install lockout tag before changing blower speed CONTINUOUS FAN OPERATION When the DEHUM feature is not used the continuous fan speed will be the same as cooling fan speed When the DEHUM feature is used the continuous fan will operate on IFB LOW speed when the DH control lead is not energized or IFB HIGH speed when the DH lead is energized see Fig 11 COOLING SEQUENCE OF OPERATION With the room thermostat SYSTEM switch in the COOL position and the FAN switch in the AUTO position the cooling sequence of operation is as follows When the room temperature rises to a point that is slightly above the cooling control setting of the thermostat the thermostat completes
30. the circuit between thermostat terminal R to terminals Y and G These completed circuits through the thermostat connect contactor coil C through unit wire Y and time delay relay TDR through unit wire G across the 24 V secondary of transformer TRAN The normally open contacts of energized contactor C close and complete the circuit through compressor motor COMP to condenser outdoor fan motor OFM Both motors start instantly A set of normally open contacts on the interface fan board IFB are closed which energizes a circuit to the indoor fan motor IFB NOTE Once the compressor has started and then has stopped it should not be started again until 5 minutes have elapsed The cooling cycle remains on until the room temperature drops to a point that is slightly below the cooling control setting of the room thermostat At this point the thermostat breaks the circuit between thermostat terminal R to terminals Y and G These open circuits deenergize contactor coil C and IFB The condenser and compressor motors stop After a 90 second delay the blower motor stops The unit is in a standby condition waiting for the next call for cooling from the room thermostat 14 0881 S961 0802 0822 gzez 0882 Grtz oesz 09v 1A0S 0941 0661 oroz 0212 9622 Srez 2 9092 yori 8 1 05 091 9091 0891 0291 0291 0141 9221
31. 95 5 6 Loz 9 09 5 0 21902 L 0t2 800 0 6 6 09 1406 v vis 1 02 Bezi 5 9 2 622 sos 09 6 09 09 8rV 1406 Lum esl eccl 9 69 291 oey 09 5 062 802 L 062 800 O G 8vY IANS 2 Lin erti v vig vroe vit vr cele zr 09 6 09 09 1406 1 Lum ev lett zip 09 t 0c2 802 1 062 002 0 5 1405 1 x 9i 8 SILISIYJLIVYYHI LINA ALIUD 30 331439 WW NT 189138 LINN IN LIND 1991819313 L 1 rye 1077561 816 61 V 1A0S imensions Fig 3 50VL A42 60 Unit D Dashed lines show cross support location for large basepan units HVAC unit basepan HVAC unit base rails Sealing Gasket Roofcurb Wood nailer Anchor screw Flashing field supplied Roofcurb Insulation field supplied Roofing material field supplied Cant strip field supplied SMALL COMMON CURB 09090 SMALL SURB BASE AIR UNIT LARGE RETURN BASE AIR UNIT UNIT PLACEMENT ON COMMON CURB 09094 LARGE CURB nus SMALL OR LARGE BASE UNIT A09414 B A B UNIT CATALOG small common G H IN large base IN IN IN IN SIZE NUMBER mm 57 mm mm
32. 981 9061 0861 9202 2902 Ee 186 nm Ferd 2191 6991 1091 ert 9691 9844 MER 8 05 vOLL 161 8LEL 1961 pork mm Ul 0801 9 zt vec 292 LGEL Zov L MERI anig 0961 Srl 8191 8991 1091 SOL 8811 1821 8221 ELEL 91 6911 9091 MER 08 126 746 2201 9601 198 868 996 9101 9201 92 281 9621 MERI anig LELL 0421 mm DTI 2191 0891 069 801 8921 9LEL HEIL 9 9 9091 678 816 196 9701 ZOLL est 9221 0621 96v 1 08 892 828 768 146 4201 0601 ezz 0621 MER Ul 289 692 928 768 196 1201 660 8911 MERI anig 169 018 188 196 SLOL 2801 2021 MER 08 99 289 892 ore 916 966 7901 Ee 19 98 869 008 188 796 6201 8801 MER 0 1 05 197 8 9 999 Ezg 199 46 Ul 91 Lvs 89 MERI ng mo org Le 188 696 9804 1911 TT 45 199 692 ore 216 6001 0
33. CATION MODE ECON ECONOMIZER FACTORY WIRING GND GROUND FIELD CONTROL WIRING HPS HIGH PRESSURE SWITCH SLELO POWER WIRING re TNTEREACE FAN BOARD RY OR OPTIONA LET WRG eee IFM INDOOR FAN MOTOR LPS LOW PRESSURE SWITCH 10 INDICATE COMMON OUTDOOR FAN MOTOR 10 W POTENTIAL ONLY T TANDARD M NOT TO REPRESENT WIRING OPER E HPS NOTES 1 IF ANY OF THE ORIGINAL WIRES FURNISHED ARE REPLACED THEY MUST REPLACED WITH THE WIRE OR IT S EQUIVALENT 2 SEE PRICE PAGES FOR THERMOSTATS 3 USE 75 DEGREE COPPER CONDUCTORS FOR FIELD INSTALLATION uie 4 REFER TO INSTALLATION INSTRUCTIONS GND FOR CORRECT SPEED SELECTION OF IFM SEE HEATER 5 RELOCATION OF SPEED TAPS MAY REQUIRED iit o o ES NSULT INSTALLATION INSTRUCTION 6 FORSWIRING DISCONNECT DETERMINE CORRECT SPEED TAP SETTING L9 4 PER NEC 6 DO NOT DISCONNECT PLUG UNDER LOAD R _ 7 THIS FUSE IS MANUFACTURED BY LITTELFUSE P N 251003 H 8 DEHUM FEATURE CANNOT BE USED WHEN ECONOMIZER IS INSTALLED 24V SPLICE UNIT FACTORY SHIPPED IN STD MODE BOX 24V POWER ENTRY COMPRESSOR INDOOR FAN CONTROL BOX AREA SECTION SECTION 21 11 SINGLE 23 13 LPS CONNECTION FOR ELECT HEAT lt lt m COMP IFB
34. ECTION The transformer is of the energy limiting type however a direct short will likely blow a secondary fuse an overload or short is present correct overload condition and check for blower fuse on Indoor Fan Board Replace fuse as required with correct size and rating 10 Table 1 Physical Data Unit 50VL A UNIT SIZE 24 30 36 42 48 60 NOMINAL CAPACITY ton 2 2 1 2 3 3 1 2 4 5 SHIPPING WEIGHT Ib 295 307 365 421 439 467 SHIPPING WEIGHT kg 134 139 166 191 199 212 COMPRESSORS Scroll Quantity 1 REFRIGERANT 410A Quantity Ib 6 0 5 6 9 5 8 8 9 4 12 5 Quantity kg 2 7 2 5 4 3 4 0 4 3 5 7 REFRIGERANT METERING DEVICE TXV OUTDOOR COIL Rows Fins in 1 21 1 21 2 21 2 21 2 21 2 21 Face Area sq ft 11 9 13 6 15 4 13 6 17 5 21 4 OUTDOOR FAN Nominal Cfm 2500 2700 2800 3000 3200 3600 Diameter in 24 24 24 26 26 26 Diameter mm 609 6 609 6 609 6 660 4 660 4 660 4 Motor Hp Rpm 1 10 810 1 10 810 1 5 810 1 5 810 1 5 810 1 5 810 INDOOR COIL Rows Fins in 3 17 3 17 3 17 3 17 3 17 3 17 Face Area sq ft 3 7 3 7 3 7 4 7 4 7 5 7 INDOOR BLOWER Nominal Cooling Airflow Cfm 800 1000 1200 1400 1600 1750 Size in 10x10 10x10 11x10 11x10 11x10 11x10 Size mm 254x254 254x254 279 4x254 279 4x254 279 4x254 279 4x254 Motor HP RPM 1 2 1050 1 2 1050 3 4 1000 3 4 1075 1 0 1075 1 0 1040 HIGH PRESSURE SWITCH 650 15 psig
35. G ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death Before performing service or maintenance operations on the system turn off main power to unit and install lockout tag 1 Open all electrical disconnects and install lockout tag before starting any service work 2 Remove horizontal metal ductcovers to access vertical downflow discharge duct knockouts in unit basepan See Fig 9 To remove downflow return and supply knockout covers break front and right side connecting tabs with a screwdriver and hammer Push cover down to break rear and left side tabs NOTE These panels are held in place with tabs similar to an electrical knockout Reinstall horizontal duct covers Fig 9 shipped on unit from factory Insure openings are air and watertight NOTE The design and installation of the duct system must be in accordance with the standards of the NFPA for installation of nonresidence type air conditioning and ventilating systems NFPA 90A or residence type NFPA 90B and or local codes and ordinances Adhere to the following criteria when selecting sizing and installing the duct system 1 Units are shipped for side shot installation 2 Select and size ductwork supply air registers and return air grilles according to American Society of Heating Refrigeration and Air Conditioning Engineers ASHRAE recommendations 3 Use flexible transition between rigid ductwork and
36. G ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death The unit cabinet must have an uninterrupted unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur This ground may consist of an electrical wire connected to the unit ground screw in the control compartment or conduit approved for electrical ground when installed in accordance with NFPA 70 NEC latest edition in Canada Canadian Electrical Code CSA C22 1 and local electrical codes 4 CAUTION UNIT COMPONENT DAMAGE HAZARD Failure to follow this caution may result in damage to the unit being installed 1 Make all electrical connections in accordance with NFPA 70 NEC latest edition and local electrical codes governing such wiring In Canada all electrical connections must be in accordance with CSA standard C22 1 Canadian Electrical Code Part 1 and applicable local codes Refer to unit wiring diagram Use only copper conductor for connections between field supplied electrical disconnect switch and unit DO NOT USE ALUMINUM WIRE Be sure that high voltage power to unit is within operating voltage range indicated on unit rating plate On 3 phase units ensure phases are balanced within 2 percent Consult local power company for correction of improper voltage and or phase imbalance Do not damage internal components when drilling through any panel to mou
37. NG ELECTRICAL SHOCK AND FIRE HAZARD Failure to follow these warnings could result in personal injury or death Turn off electrical power to the unit and install lockout tag before performing any maintenance or service on this unit Use extreme caution when removing panels and parts Never place anything combustible either on or in contact with the unit CAUTION UNIT OPERATION HAZARD Failure to follow this caution may result in equipment damage or improper operation Errors made when reconnecting wires may cause improper and dangerous operation Label all wires prior to disconnecting when servicing The minimum maintenance requirements for this equipment are as follows 1 Inspect air filter s each month Clean or replace when necessary 2 Inspect indoor coil drain pan and condensate drain each cooling season for cleanliness Clean when necessary 3 Inspect blower motor and wheel for cleanliness each cooling season Clean when necessary 4 Check electrical connections for tightness and controls for proper operation each cooling season Service when necessary 5 Ensure electric wires are not in contact with refrigerant tubing or sharp metal edges Air Filter IMPORTANT Never operate the unit without a suitable air filter in the return air duct system Always replace the filter with the same dimensional size and type as originally installed See Table 1 for recommended filter sizes Inspect air f
38. ONNECTION WIRING DIAGRAM DANGER ELECTRICAL SHOCK HAZARD DISCONNECT POWER BEFORE SERVICING IF USED SCHEMATIC on BLK T IF USED IF USED 3 0 1 6 0 FIELD GRN BLK SUPPLY BLK POWER gu Hx BLK BLK OFM UNIT ONLY A 7 MAXIMUM WIRE L2 SIZE 2 AWG YEL 23 03 YEL YEL BRN rr CF COMPRESSOR PLUG EQUIP_GND COMP YEL YEL JR w 4 ELECTRIC HEATERS BLK BLU FOR WIRING WITH EE SEE SCHEMATIC r YEL ON HEATER lent 1 ACCESSORY aT I 4 GND 6RN YEL po IT BLK 30 9 Co FM 1 GRN YEL BRN MENO 12345 IL TRAN 4 c SEE NOTE 5 amp 6 BRN 11 BRN 1 1 RED 1 Lace o 2 SEE NOTE 7 SEE NOTE 4 SEE NOTE 8 R RED 4
39. RED zii om Rub Eu FOR WIRING DISCONNECT DETERMINE CORRECT SPEED TAP SETTING ceu N 6 DO NOT DISCONNECT PLUG UNDER LOAD R Lo 1 THIS FUSE IS MANUFACTURED BY LITTELFUSE P N 257003 e 8 THESE FUSES ARE MANUFACTURED BY COOPER BUSSMAN P N FNO R 5 24V SPLICE 9 DEHUM FEATURE CANNOT BE USED WHEN ECONOMIZER I INSTALLED BOX 24V POWER ENTRY UNIT FACTORY SHIPPED IN STD MODE A10204C Fig 14 Connection Wiring Diagram 460 3 60 21 LADDER WIRING DIAGRAM DANGER ELECTRICAL SHOCK HAZARD DISCONNECT POWER BEFORE SERVICING 12 L L3 BLK p YEL IF USED U CCH C 21 MN 23 119 1 RED BLK l E 713 CRE 7 YEL BRN CAP YEL BLU 110 38LK YELQ13 1 CLENY GIY r3 460V TRAN 460V O BLK 13 RED 24 24V SEE NOTE 7 RED 24VAC usc nu R O RED R C O BRN C YIO YEL G O GRN 2140 g 5 Y2 DH 2 O WHT w2 3 O vIO P2 10 P2 20 e P2 30 P2 40 5 LPS NETT BLO OBLK O 8LU CO C O BRN OC TRAN ACCESSORY ELECTRIC HEAT EL lt DUM uw BRN P4 10 WT BRN p4 20 _ _V10 4 N
40. Servicing Systems on Roofs with Synthetic Materials POE polyolester compressor lubricants are known to cause long term damage to some synthetic roofing materials Exposure even if immediately cleaned up may cause embrittlement leading to cracking to occur in one year or more When performing any service that may risk exposure of compressor oil to the roof take appropriate precautions to protect roofing Procedures which risk oil leakage include but are not limited to compressor replacement repairing refrigerant leaks replacing refrigerant components such as filter drier pressure switch metering device coil accumulator or reversing valve Synthetic Roof Precautionary Procedure 1 Cover extended roof working area with an impermeable polyethylene plastic drip cloth or tarp Cover an approximate 10 x 10 ft 3 x 3 m area 2 Cover area in front of the unit service panel with a terry cloth shop towel to absorb lubricant spills prevent run offs and protect drop cloth from tears caused by tools or components 3 Place terry cloth shop towel inside unit immediately under component s to be serviced and prevent lubricant run offs through the louvered openings in the unit base 4 Perform required service 5 Remove and dispose of any oil contaminated material per local codes Liquid Line Filter Drier The filter drier is specifically designed to operate with Puron Use only factory authorized components Filter drier must be
41. ated 35 C minimum wires STANDARD CONNECTION Locate the seven eight for 3 phase low voltage thermostat leads in 24 volt splice box A gray wire is standard on 3 phase units for connection to an economizer See Fig 10 for connection diagram Run the low voltage leads from the thermostat through the control wiring inlet hole grommet Fig 2 and 3 and into the low voltage splice box Provide a drip loop before running wires through panel Secure and strain relief all wires so that they do not interfere with operation of unit If an accessory electric heater is installed low voltage leads from heater must be connected to factory supplied control leads from Indoor Fan Board P4 connector NOTE If the unit 24V wires do not have a matching receptacle cut the 24V wires from the electric heater plug strip the ends and wire nut together to match the schematic connections If the electric heater 24V wires do not have a matching plug cut the 24V wires from the unit receptacle strip the ends and wire nut together to match the schematic connections Factory wires are provided for electric heat staging W1 and W2 W2 and W3 on IFB If room thermostat has only one stage of supplemental heat connect white and violet wires shown in Fig 10 to second stage heat field wire Some electric heaters have four control wires plus common wire Consult unit wiring diagram and electric heater wiring diagram for additional details TRANSFORMER PROT
42. coils are easily cleaned when dry therefore inspect and clean the coils either before or after each cooling season Remove all obstructions including weeds and shrubs that interfere with the airflow through the condenser coil Straighten bent fins with a fin comb If coated with dirt or lint clean the coils with a vacuum cleaner using the soft brush attachment Be careful not to bend the fins If coated with oil or grease clean the coils with a mild detergent and water solution Rinse coils with clear water using a garden hose Be careful not to splash water on motors insulation wiring or air filter s For best results spray condenser coil fins from inside to outside the unit On units with an outer and inner condenser coil be sure to clean between the coils Be sure to flush all dirt and debris from the unit base Inspect the drain pan and condensate drain line when inspecting the coils Clean the drain pan and condensate drain by removing all foreign matter from the pan Flush the pan and drain trough with clear water Do not splash water on the insulation motor wiring or air filter s If the drain trough is restricted clear it with a plumbers snake or similar probe device OUTDOOR FAN CAUTION UNIT OPERATION HAZARD Failure to follow this caution may result in damage to unit components Keep the condenser fan free from all obstructions to ensure proper cooling operation Never place articles on top of the
43. ed to protect against extreme high pressure The relief port has an operating range between 550 26 3 kPa and 625 29 9 kPa psig differential pressure Refrigerant A WARNING EXPLOSION ENVIRONMENTAL HAZARD Failure to follow this warning could result in personal injury death or equipment damage This system uses Puron R 410A refrigerant which has higher operating pressures than R 22 and other refrigerants No other refrigerant may be used in this system Gauge set hoses and recovery system must be designed to handle Puron If you are unsure consult the equipment manufacturer This system uses Puron R 410A refrigerant which has higher operating pressures than R 22 and other refrigerants No other refrigerant may be used in this system Gage set hoses and recovery system must be designed to handle Puron If you are unsure consult the equipment manufacturer Failure to use Puron compatible servicing equipment or replacement components may result in property damage or injury Compressor The Copeland scroll compressor uses 3MAF POE oil If additional oil is needed use Uniqema RL32 3MAF If this oil is not available use Copeland Ultra 32 CC or Mobil Arctic EAL22 CC This oil is extremely hygroscopic meaning it absorbs water 26 readily POE oils can absorb 15 times as much water as other oils designed for HCFC and CFC refrigerants Take all necessary precautions to avoid exposure of the oil to the atmosphere
44. es do not touch refrigerant tubing or sharp sheet metal edges e Inspect coil fins If damaged during shipping and handling carefully straighten fins with a fin comb 4 Verify the following conditions a Make sure that condensate drain pan and trap are filled with water to ensure proper drainage b Make sure that all tools and miscellaneous loose parts have been removed START UP Step 1 Check for Refrigerant Leaks Proceed as follows to locate and repair a refrigerant leak and to charge the unit 1 Locate leak and make sure that refrigerant system pressure has been relieved and reclaimed from both high and low pressure ports 2 Repair leak following accepted practices NOTE Install a filter drier whenever the system has been opened for repair 3 Add a small charge of Puron R 410A refrigerant vapor to system and leak test unit 4 Recover refrigerant from system and evacuate to 500 microns if no additional leaks are found 5 Charge unit with Puron R 410A refrigerant using an accurate scale Refer to unit rating plate for required charge Step 2 Start Up Cooling Section And Make Adjustments Complete the required procedures given in the Pre Start Up section before starting the unit Do not jumper any safety devices when operating the unit Do not operate the unit when the outdoor temperature is below 40 F 4 C unless accessory low ambient kit is installed Do not rapid cycle the compressor Allow 5
45. ht suggestions which will result in enhanced installation reliability or operation WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death Before installing or servicing system always turn off main power to system and install lockout tag There may be more than one disconnect switch Turn off accessory heater power switch if applicable 4 WARNING PERSONAL INJURY AND ENVIRONMENTAL HAZARD Failure to relieve system pressure could result in personal injury and or death 1 Relieve pressure and recover all refrigerant before servicing existing equipment and before final unit disposal Use all service ports and open all flow control devices including solenoid valves 2 Federal regulations require that you do not vent refrigerant into the atmosphere Recover during system repair or final unit disposal 4 CAUTION CUT HAZARD Failure to follow this caution may result in personal injury When removing access panels see Fig 17 or performing maintenance functions inside your unit be aware of sharp sheet metal parts and screws Although special care is taken to reduce sharp edges to a minimum be extremely careful when handling parts or reaching into the unit INTRODUCTION The 50VL A packaged air conditioner is fully self contained and designed for outdoor installation See Fig 1 See Fig 2 and 3 for unit dimensions All unit sizes have discharge opening
46. ical shock or other conditions which may cause death personal injury or property damage Consult a qualified installer service agency or your distributor or branch for information or assistance The qualified installer or agency must use factory authorized kits or accessories when modifying this product Refer to the individual instructions packaged with the kits or accessories when installing Follow all safety codes Wear safety glasses protective clothing and work gloves Use quenching cloth for brazing operations Have a fire extinguisher available Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit Consult local building codes the current editions of the National Electrical Code NEC NFPA 70 In Canada refer to the current editions of the Canadian electrical Code CSA C22 1 Recognize safety information This is the safety alert symbol A When you see this symbol on the unit and in instructions or manuals be alert to the potential for personal injury Understand these signal words DANGER WARNING and CAUTION These words are used with the safety alert symbol DANGER identifies the most serious hazards which will result in severe personal injury or death WARNING signifies hazards which could result in personal injury or death CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage NOTE is used to highlig
47. igh and Control Voltage Connections 5 Connect field wire L2 to yellow wire on connection 23 of the compressor contactor Three phase units 1 Run the high voltage L1 L2 L3 and ground lead into the control box 2 Connect ground lead to chassis ground connection 3 Locate the black and yellow wires connected to the line side of the contactor 4 Connect field L1 to black wire on connection 11 of the compressor contactor 5 Connect field wire L3 to yellow wire on connection 13 of the compressor contactor 6 Connect field wire L2 to blue wire from compressor SPECIAL PROCEDURES FOR 208 V OPERATION 4 WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death Before installing or servicing system always turn off main power to system and install lockout tag With disconnect switch open move black wire from transformer 3 16 in 4 8 mm terminal marked 230 to terminal marked 208 This retaps transformer to primary voltage of 208 vac CONTROL VOLTAGE CONNECTIONS NOTE Do not use any type of power stealing thermostat Unit control problems may result Use 18 American Wire Gage AWG color coded insulated 35 minimum wires to make the control voltage connections between the thermostat and the unit If the thermostat is located more than 100 ft 30 5 m from the unit as measured along the control voltage wires use 16 AWG color coded insul
48. ilter s at least once each month and replace throwaway type or clean cleanable type at least twice during each cooling season and twice during the heating season or whenever the filter becomes clogged with dust and lint Indoor Blower and Motor NOTE All motors are pre lubricated Do not attempt to lubricate these motors For longer life operating economy and continuing efficiency clean accumulated dirt and grease from the blower wheel and motor annually 4 WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death Disconnect and tag electrical power to the unit before cleaning the blower motor and wheel To clean the blower motor and wheel 1 Remove and disassemble blower assembly as follows a Remove blower access panel see Fig 17 b Disconnect 5 pin plug and 4 pin plug from indoor blower motor Remove capacitor if required c On all units remove blower assembly from unit Remove screws securing blower to blower partition and slide assembly out Be careful not to tear insulation in blower compartment d Ensure proper reassembly by marking blower wheel and motor in relation to blower housing before disassembly e Loosen setscrew s that secures wheel to motor shaft remove screws that secure motor mount brackets to housing and slide motor and motor mount out of housing 2 Remove and clean blower wheel as follows a Ensure proper reassembly by marking
49. ing fan speeds The rated cooling fan speed 350 400 CFM Ton and an enhanced dehumidification fan speed As low as 320 CFM Ton for use with either a dehumidistat or a thermostat that supports dehumidification The cooling speed is marked LOW on the interface fan board IFB See Fig 11 The factory shipped settings are noted in Table 4 There are 4 additional speed tap wires available for use in either electric heating or cooling For color coding on the indoor fan motor leads see Table 3 The additional 4 speed tap wires are shipped loose with vinyl caps and are located in the control box near the interface fan board IFB See Fig 11 SINGLE COOLING FAN SPEED SET UP Dehumidi fication feature not used To change cooling speed 1 Remove the vinyl cap off of the desired speed tap wire Refer to Table 3 for color coding Add the wet coil pressure drop in Table 6 to the system static to determine the correct cooling airflow speed in Table 4 that will deliver the nominal cooling airflow as listed in Table 1 for each size 2 Remove the current speed tap wire from the LOW terminal on the interface fan board IFB See Fig 11 and place vinyl cap over the connector on the wire 3 Connect the desired speed tap wire to the LOW terminal on the interface fan board IFB NOTE If accessory electric heat is installed and the electric heat fan speed is chosen to be the same as the normal cooling fan speed the dr
50. ive condenser coil pressure It opens at 650 psig 31 1 kPa High pressure may be caused by a dirty condenser coil failed fan motor or condenser air recirculation To check switch 1 Turn off all power to unit 2 Disconnect leads on switch 3 Apply ohmmeter leads across switch You should have continuity on a good switch Copeland Scroll Compressor Puron Refrigerant The compressor used in this product is specifically designed to operate with Puron R 410A refrigerant and cannot be interchanged The compressor is an electrical as well as mechanical device Exercise extreme caution when working near compressors Power should be shut off if possible for most troubleshooting techniques Refrigerants present additional safety hazards 4 WARNING FIRE EXPLOSION HAZARD Failure to follow this warning could result in personal injury or death and or property damage Wear safety glasses and gloves when handling refrigerants Keep torches and other ignition sources away from refrigerants and oils The scroll compressor pumps refrigerant throughout the system by the interaction of a stationary and an orbiting scroll The scroll compressor has no dynamic suction or discharge valves and it is more tolerant of stresses caused by debris liquid slugging and flooded starts The compressor is equipped with a noise reducing shutdown device and an internal pressure relief port The pressure relief port is a safety device design
51. minutes between on cycles to prevent compressor damage CHECKING COOLING CONTROL OPERATION Start and check the unit for proper cooling control operation as follows 1 Place room thermostat SYSTEM switch in OFF position Observe that blower motor starts when FAN switch is placed in ON position and shuts down when FAN switch is placed in AUTO position 2 Place SYSTEM switch in COOL position and FAN switch in AUTO position Set cooling control below room temperature Observe that compressor condenser fan and evaporator blower motors start Observe that compressor and outdoor fan shut down when control setting is satisfied and that indoor blower shuts down after 90 second fan time delay expires IMPORTANT Three phase scroll compressors are direction oriented Unit must be checked to ensure proper compressor 3 phase power lead orientation If not corrected within 5 minutes the internal protector will shut off the compressor The 3 phase power leads to the unit must be reversed to correct rotation When turning backwards the difference between compressor suction and discharge pressures may be minimal CHECKING AND ADJUSTING REFRIGERANT CHARGE The refrigerant system is fully charged with Puron R 410A refrigerant and is tested and factory sealed NOTE Adjustment of the refrigerant charge is not required unless the unit is suspected of not having the proper Puron R 410A charge A subcooling charging chart is attached to the
52. nt electrical hardware conduit etc HIGH VOLTAGE CONNECTIONS The unit must have a separate electrical service with a field supplied waterproof disconnect switch mounted at or within sight from the unit Refer to the unit rating plate NEC and local codes for maximum fuse circuit breaker size and minimum circuit amps ampacity for wire sizing The field supplied disconnect may be mounted on the unit over the high voltage inlet hole when the standard power and low voltage entry points are used See Fig 2 and 3 for acceptable location See unit wiring label Fig 12 13 and 14 and Fig 10 for reference when making high voltage connections Proceed as follows to complete the high voltage connections to the unit Single phase units 1 Run the high voltage L1 L2 and ground lead into the control box 2 Connect ground lead to chassis ground connection 3 Locate the black and yellow wires connected to the line side of the contactor 4 Connect field L1 to black wire on connection 11 of the compressor contactor POWER LEADS SEE UNIT WIRING LABEL 3 SHOWN 1 PHASE USES E TWO POWER LEADS EQUIP GR ip POWER SUPPLY FIELD SUPPLIED FUSED DISCONNECT CONTROL BOX WATANI VIO 2 YELM GRN G LOW VOLTAGE POWER LEADS 2 SEE UNIT BRN C WIRING LABEL 2 p BLU DH SPLICE BOX 09066 Fig 10 H
53. o ECON HARNESS i P4 30 PNK BRN BRA 2 P4 4O GRY 453 SRY 3 4 BRN 222222 5 ri EN SEE NOTE 9 6 PNK 6 BLU STD c BLU T 77 1 PNK 8LU O4 PNK C 8 DEHUMLO SEE NOTE 4 RED O BRN HIGH ORN 5 N BRN 6 Y RED TTT 50VL500211 D A10204 Fig 14 Cont Ladder Wiring Diagram 460 3 60 22 e 5 44 072 C 00S1A0S ay JAMO s y 6 anjen ajqe y uey s painseaw au PPY 8 p nb e 10 ay Y PEY 251 1 55 ay jo eunsseJd ay y ay enjeA 99 9 14 y ui 2 ejejodJoju G jueiquiy pue 9215 japow ay uo peseq eu ui p nb ay y ay jueiquiy ay os
54. of the load as it relates to operation of the lifting kit such as balance temperature etc Follow all applicable safety codes Wear safety shoes and work gloves MAXIMUM ALLOWABLE B DIFFERENCE in mm A B B C A C 1 4 6 35 1 4 6 35 1 4 6 35 A07925 Fig 6 Unit Leveling Tolerances INSPECTION Prior to initial use and at monthly intervals all rigging shackles clevis pins and straps should be visually inspected for any damage evidence of wear structural deformation or cracks Particular attention should be paid to excessive wear at hoist hooking points and load support areas Materials showing any kind of wear in these areas must not be used and should be discarded A WARNING UNIT FALLING HAZARD Failure to follow this warning could result in personal injury or death Never stand beneath rigged units or lift over people 1 Leave top shipping skid on the unit for use as a spreader bar to prevent the rigging straps from damaging the unit If the skid is not available use a spreader bar of sufficient length to protect the unit from damage WARNING PROPERTY DAMAGE HAZARD Failure to follow this warning could result in personal When straps are taut the clevis should be a minimum of 36 in 914 mm above the unit top cover Rigging Lifting of Unit See Fig 5 4 WARNING UNIT FALLING HAZARD Failure to follow this warning could result in personal injury or death Large
55. ommended sizes for filters are shown in Table 1 2 Avoid abrupt duct size increases and reductions Abrupt change in duct size adversely affects air performance IMPORTANT Use flexible connectors between ductwork and unit to prevent transmission of vibration Use suitable gaskets to ensure weather tight and airtight seal When electric heat is installed use fireproof canvas or similar heat resistant material connector between ductwork and unit discharge connection If flexible duct is used insert a sheet metal sleeve inside duct Heat resistant duct connector or sheet metal sleeve must extend 24 in 610 mm from electric heater element 3 Size ductwork for cooling air quantity cfm The minimum air quantity for proper electric heater operation is listed in Table 2 Heater limit switches may trip at air quantities below those recommended 4 Seal insulate and weatherproof all external ductwork Seal insulate and cover with a vapor barrier all ductwork passing through conditioned spaces Follow latest Sheet Metal and Air Conditioning Contractors National Association SMACNA and Air Conditioning Contractors Association ACCA minimum installation standards for residential heating and air conditioning systems 5 Secure all ducts to building structure Flash weatherproof and vibration isolate duct openings in wall or roof according to good construction practices CONFIGURING UNITS FOR DOWNFLOW VERTICAL DISCHARGE 4 WARNIN
56. or cooling sequence of operation in this publication as an aid in determining proper control operation Refrigerant Circuit Inspect all refrigerant tubing connections and the unit base for oil accumulations annually Detecting oil generally indicates a refrigerant leak WARNING EXPLOSION SAFETY AND ENVIRONMENTAL HAZARD Failure to follow this warning could result in personal injury death or equipment damage This system uses Puron R 410A refrigerant which has higher operating pressures than R 22 and other refrigerants No other refrigerant may be used in this system Gauge set hoses and recovery system must be designed to handle Puron If you are unsure consult the equipment manufacturer If oil is detected or if low cooling performance is suspected leak test all refrigerant tubing using an electronic leak detector halide torch or liquid soap solution If a refrigerant leak is detected refer to Check for Refrigerant Leaks section If no refrigerant leaks are found and low cooling performance is suspected refer to Checking and Adjusting Refrigerant Charge section Evaporator Airflow The heating and or cooling air flow does not require checking unless improper performance is suspected If a problem exists be sure that all supply and return air grilles are open and free from obstructions and that the air filter is clean When necessary refer to Indoor Airflow and Airflow Adjustments section to check the system
57. rb and building structure on vertical discharge units Do not connect ductwork to unit For horizontal applications unit is provided with flanges on the horizontal openings All ductwork should be secured to the flanges Insulate and weatherproof all external ductwork joints and roof openings with counter flashing and mastic in accordance with applicable codes Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier If a plenum return is used on a vertical unit the return should be ducted through the roof deck to comply with applicable fire codes See unit rating plate for any required clearances around ductwork Cabinet return air static shall not exceed 25 IN W C Step 5 Rig and Place Unit Rigging and handling of this equipment can be hazardous for many reasons due to the installation location roofs elevated structures etc Only trained qualified crane operators and ground support staff should handle and install this equipment When working with this equipment observe precautions in the literature on tags stickers and labels attached to the equipment and any other safety precautions that might apply Training for operators of the lifting equipment should include but not be limited to the following 1 Application of the lifter to the load and adjustment of the lifts to adapt to various sizes or kinds of loads 2 Instruction in any special operation or precaution 3 Condition
58. re required when using this kit 2 An alternative to the adapter curb is to modify the existing curb by removing the outer horizontal flange and use accessory kit number CPGSKTKIT001A00 which includes spacer blocks for easy alignment to existing curb and gaskets for the perimeter seal and duct openings This kit is used when existing curb is modified by removing outer horizontal flange A CAUTION UNIT STRUCTURAL DAMAGE HAZARD Failure to follow this caution may result in property damage Ensure there is sufficient clearance for saw blade when cutting the outer horizontal flange of the roof curb so there is no damage to the roof or flashing SLAB MOUNT Place the unit on a solid level concrete pad that is a minimum of 4 in 102 mm thick with 2 in 51 mm above grade The slab should extend approximately 2 in 51 mm beyond the casing on all 4 sides of the unit See Fig 7 Do not secure the unit to the slab except when required by local codes 0 082006 1A0S AW uvau 8 052 6761 8 062 9 1 6 8 5 12 9 1 6 I 18 go L 3 J oc n 27207 ES 8 1 61 Nun Lau TAINVd 83 001 TIIN NI 38V 1 NI SNO Su3L3NI G3STHOUdNOD 32NYNUO 38 TIVA NIHL NILSAS 19 VOE ZL 5531 03514 SI LINN 3I 3ONVISTQ WAWINIWS 518150805 OL SIINVAYTIO
59. replaced whenever the refrigerant system is opened When removing a filter drier use a tubing cutter to cut the drier from the system Do not unsweat a filter drier from the system Heat from unsweating will release moisture and contaminants from drier into system Puron R 410A Refrigerant Charging Refer to unit information plate and charging chart Some R 410A refrigerant cylinders contain a dip tube to allow liquid refrigerant to flow from cylinder in upright position For cylinders equipped with a dip tube charge Puron units with cylinder in upright position and a commercial metering device in manifold hose Charge refrigerant into suction line TROUBLESHOOTING Refer to the Troubleshooting Chart Table 10 for troubleshooting information START UP CHECKLIST Use the Start Up Checklist at the back of this manual 27 Table 10 Troubleshooting Chart SYMPTOM CAUSE REMEDY Compressor and outdoor fan will not start Power failure Call power company Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker Defective contactor transformer control relay or high pressure loss of charge or low pressure switch Replace component Insufficient line voltage Determine cause and correct Incorrect or faulty wiring Check wiring diagram and rewire correctly Thermostat setting too low too high Reset thermostat setting Compressor will not start but condenser
60. s for both horizontal and downflow configurations and are factory shipped with all downflow duct openings covered The unit may be installed either on a rooftop or on a ground level cement slab See Fig 4 for roof curb dimensions RECEIVING AND INSTALLATION Step 1 Check Equipment IDENTIFY UNIT The unit model number and serial number are printed on the unit informative plate Check this information against shipping papers INSPECT SHIPMENT Inspect for shipping damage before removing packaging materials If unit appears to be damaged or is torn loose from its anchorage have it examined by transportation inspectors before removal Forward claim papers directly to transportation company Manufacturer is not responsible for any damage incurred in transit Check all items against shipping list Immediately notify the nearest equipment distribution office if any item is missing To prevent loss or damage leave all parts in original packages until installation If the unit is to be mounted on a curb in a downflow application review Step 7 to determine which method is to be used to remove the downflow panels before rigging and lifting into place The panel removal process may require the unit to be on the ground Step 2 Provide Unit Support IMPORTANT The unit must be secured to the curb by installing screws through the bottom of the curb flange and into the unit base rails When installing large base units onto the common curb
61. stat temperature set too low Reset thermostat setting Low refrigerant charge Locate leak repair and recharge Air in system Recover refrigerant evacuate system and re charge Outdoor coil dirty or restricted Clean coil or remove restriction Excessive head pressure Dirty air filter Replace filter Dirty indoor or outdoor coil Clean coil Refrigerant overcharged Recover excess refrigerant Air in system Recover refrigerant evacuate system and re charge Indoor or outdoor air restricted or air short cycling Determine cause and correct Head pressure too low Low refrigerant charge Check for leaks repair and recharge Restriction in liquid tube Remove restriction Excessive suction pressure Refrigerant overcharged Recover excess refrigerant Suction pressure too low Dirty air filter Replace filter Low refrigerant charge Check for leaks repair and recharge Metering device or low side restricted Remove source of restriction Insufficient coil airflow Check filter replace if necessary Temperature too low in conditioned area Reset thermostat setting Outdoor ambient below 55 F 13 Install low ambient kit Filter drier restricted Replace 28 AIR CONDITIONER WITH PURON R 410A QUICK REFERENCE GUIDE Puron refrigerant operates at 50 70 percent higher pressures than R 22 Be sure tha
62. t servicing equipment and replacement components are designed to operate with Puron Puron refrigerant cylinders are rose colored Puron refrigerant cylinders manufactured prior to March 1 1999 have a dip tube that allows liquid to flow out of cylinder in upright position Cylinders manufactured March 1 1999 and later DO NOT have a dip tube and MUST be positioned upside down to allow liquid to flow Recovery cylinder service pressure rating must be 400 psig DOT 4 400 or BW400 Puron systems should be charged with liquid refrigerant Use a commercial type metering device in the manifold hose Manifold sets should be minimum 700 psig high side and 180 psig low side with 550 psig low side retard Use hoses with minimum 700 psig service pressure rating Leak detectors should be designed to detect HFC refrigerant e Puron as with other HFCs is only compatible with POE oils Vacuum pumps will not remove moisture from oil Only use factory specified liquid line filter driers with rated working pressures no less than 600 psig Do not install a suction line filter drier in liquid line POE oils absorb moisture rapidly Do not expose oil to atmosphere POE oils may cause damage to certain plastics and roofing materials Wrap all filter driers and service valves with wet cloth when brazing A Puron liquid line filter drier is required on every unit Do not use an R 22 TXV Never open system to
63. the screws must be installed before allowing the full weight of the unit to rest on the curb A minimum of six screws are required for large base units Failure to secure unit properly could result in an unstable unit See Warning near Rigging Lifting information and accessory curb instructions for more details For hurricane tie downs contact distributor for details and PE Professional Engineering Certificate if required ROOF CURB Install accessory roof curb in accordance with instructions shipped with curb See Fig 4 Install insulation cant strips roofing and flashing Ductwork must be attached to curb IMPORTANT The gasketing of the unit to the roof curb is critical for a water tight seal Install gasketing material supplied with the roof curb Improperly applied gasketing also can result in air leaks and poor unit performance Curb should be level to within 1 4 in 6 35 mm See Fig 6 This is necessary for unit drain to function properly Refer to accessory roof curb installation instructions for additional information as required Installation on older G series roof curbs Two accessory kits are available to aid in installing a new G series unit on an old G roof curb 1 Accessory kit number CPADCURBO001A00 small chassis and accessory kit number CPADCURBO002A00 large chassis includes roof curb adapter and gaskets for the perimeter seal and duct openings additional modifications to the curb a
64. tion 10 Control Voltage Connections 10 Standard Connection 10 Transformer Protection 10 PRE START UP 225 55 EUER Eee ROS 12 2 420425 E 12 14 Check for Refrigerant Leaks 12 Start Up Adjustments 12 Checking Cooling Control Operation 12 Checking and Adjusting Refrigerant Charge 12 Indoor Airflow and Airflow Adjustments 13 Continuous Fan Operation 14 Cooling Sequence of Operation 14 MAINTENANCE tice ees bee ry ee es 24 26 Ait Filter 235 ize ERG RES ERE oie ERR ee ENS 24 Indoor Blower and Motor 24 Outdoor Coil Indoor Coil and Condensate Drain Pan 25 Outdoor Fan ss 25 Electrical Controls and Wiring 25 Refrigerant 26 Evaporator Airflow 26 MEMS 2205 26 TROUBLESHOOTING 27 START UP CHECKLIST 27 09033 Fig 1 Unit 50 SAFETY CONSIDERATIONS Improper installation adjustment alteration service maintenance or use can cause explosion fire electr
65. unit to prevent transmission of vibration The transition may be screwed or bolted to duct flanges Use suitable gaskets to ensure weather tight and airtight seal 4 All units must have field supplied filters or accessory filter rack installed in the return air side of the unit Recommended sizes for filters are shown in Table 1 5 Size all ductwork for maximum required airflow either heating or cooling for unit being installed Avoid abrupt duct size increases or decreases or performance may be affected 6 Adequately insulate and weatherproof all ductwork located outdoors Insulate ducts passing through unconditioned space and use vapor barrier in accordance with latest issue of Sheet Metal and Air Conditioning Contractors National Association SMACNA and Air Conditioning Contractors of America ACCA minimum installation standards for heating and air conditioning systems Secure all ducts to building structure 7 Flash weatherproof and vibration isolate all openings in building structure in accordance with local codes and good building practices 09076 Downflow Vertical Basepan dd Downflow nockout Vertical Return Knockout 09093 Fig 9 Supply and Return Duct Opening Step 8 Install Electrical Connections 4 WARNIN
66. ure F db with the discharge line pressure psig to determine desired system operating liquid line temperature See Fig 15 6 Compare actual liquid line temperature with desired liquid line temperature Using a tolerance of 2 F 1 1 C add refrigerant if actual temperature is more than 2 F 1 1 C higher than proper liquid line temperature or remove refrigerant if actual temperature is more than 2 F 1 19 lower than required liquid line temperature NOTE If the problem causing the inaccurate readings is a refrigerant leak refer to Check for Refrigerant Leaks section INDOOR AIRFLOW AND AIRFLOW ADJUST MENTS CAUTION UNIT OPERATION HAZARD Failure to follow this caution may result in unit damage For cooling operation the recommended airflow is 350 to 450 cfm for each 12 000 Btuh of rated cooling capacity For heating operation the airflow must produce a temperature rise that falls within the range stamped on the unit rating plate NOTE Be sure that all supply and return air grilles are open free from obstructions and adjusted properly WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death Disconnect electrical power to the unit and install lockout tag before changing blower speed This unit is factory set up for use with a single cooling fan speed In addition this unit has the field selectable capability to run two different cool
67. wheel orientation b Lift wheel from housing When handling and or cleaning blower wheel be sure not to disturb balance weights clips on blower wheel vanes c Remove caked on dirt from wheel and housing with a brush Remove lint and or dirt accumulations from wheel and housing with vacuum cleaner using soft brush attachment Remove grease and oil with mild solvent d Reassemble wheel into housing e Reassemble motor into housing Be sure setscrews are tightened on motor shaft flats and not on round part of shaft Reinstall blower into unit f Connect 5 pin plug and 4 pin plug to indoor blower motor Reinstall capacitor if required Reinstall blower access panel see Fig 17 3 Restore electrical power to unit Start unit and check for proper blower rotation and motor speeds during cooling cycles 24 _ 08505 MAX DISTANCE BETWEEN TOP OF FAN GRILLE AND BOTTOM OF FAN BLADE SIZE IN MM 24 6 3 160 30 6 3 160 36 7 3 185 42 7 6 193 48 7 6 193 60 7 6 193 Fig 16 Fan Blade Position Control Access Panel 9 Blower Access Compressor Panel Access Panel 09214 Fig 17 Unit Access Panels Outdoor Coil Indoor Coil and Condensate Drain Pan Inspect the condenser coil evaporator coil and condensate drain pan at least once each year The
68. y airflow must meet or exceed the minimum airflow speed specified in Table 2 for the specific size unit TWO COOLING FAN SPEEDS SET UP Dehumidi fication feature used IMPORTANT Dehumidification control must open control circuit on humidity rise above set point Use of the dehumidification cooling fan speed requires use of either a 24 VAC dehumidistat or a thermostat which includes control of a 24 VAC dehumidistat connection In either case the dehumidification control must open the control circuit on humidity rise above the dehumidification set point 1 Using Fig 11 move the two pin DEHUM jumper from the STD position to the DEHUM position 2 Remove fan speed tap wire from the LOW terminal on the interface fan board IFB See Fig 11 3 Determine correct normal cooling fan speed for unit and application Add the wet coil pressure drop in Table 6 to the system static to determine the correct cooling airflow speed in Table 4 that will deliver the nominal cooling airflow as listed in Table 1 for each size NOTE If accessory electric heat is installed the dry airflow must meet or exceed the minimum airflow speed specified in Table 2 for the specific size unit The electric heat fan speed will be the same as the normal cooling fan speed 4 Remove the vinyl cap off of the desired speed tap wire Refer to Table 3 for color coding for the normal cooling fan speed and place desired speed tap wire on HIGH

Carrier 50VL---A Air Conditioner User Manual

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