Carrier 50ZHA024-060 Heat Pump User Manual
Contents
1. 030 036 042 050 055 063 072 081 036 050 055 063 072 081 090 097 042 042 049 052 059 065 071 078 085 091 048 s 072 081 090 097 108 120 129 139 060 071 078 085 091 098 114 a Slip the wheel back in the housing with the hub set screw coil fins from inside to outside the unit On units with an outer and parented in the correct direction inner outdoor coil be sure to clean between the coils Be sure to b Install the filler panel flush all dirt and debris from the unit base c Reinsert the motor assembly in the wheel hub and align the Inspect the drain pan and condensate drain line when inspecting mounting legs with the housing mounting hold locations the coils Clean the drain pan and condensate drain by removing all foreign matter from the pan Flush the pan and drain tube with d Tighten the mounting bolts to fasten the motor assembly 2 2n clear water Do not splash water on the insulation motor wiring with the housing or air filter s If the drain tube is restricted clear it with a e Center the wheel in the housing by sliding it align the flat plumbers snake or similar probe device Ensure that the end of the shaft with the set screw and tighten the set screw auxiliary drain port above the drain tube is also clear f Slide back the blower housing into th2. CONNECTING GROUND LEAD TO UNIT GROUND Refer to Fig 8 and 9 Connect the ground lead to the chassis using the unit ground in the control box ROUTING CONTROL POWER WIRES Form a drip loop with the thermostat leads before routing them into the unit Route the thermostat leads through grommeted hole provided in unit into unit control box See Fig 7 Connect thermostat leads and unit power leads as shown in Fig 9 10 amp 10B Route thermostat wires through grommet providing a drip loop at the panel Connect low voltage leads to the thermostat as shown in Fig 10 amp 10B The unit transformer supplies 24 v power for complete system including accessory electrical heater Transformer is factory wired for 230 v operation ACCESSORY ELECTRIC HEAT WIRING Refer to accessory electric heat installation instructions for infor mation on installing accessory electric heat Accessory electric heat wiring is shown in Fig 11A 11B amp 11C PRE START UP A WARNING FIRE EXPLOSION ELECTRICAL SHOCK HAZARD Failure to observe the following warnings could result in serious injury death and or property damage 1 Follow recognized safety practices and wear protective goggles when checking or servicing refrigerant system Do not operate compressor or provide any electric power to unit unless compressor terminal cover is in place and secured Do not remove compressor terminal cover until all electri cal sources are discon
3. 1500 1600 1700 1800 1900 2000 2100 2200 2300 sure to turn off the electrical power to the unit and install lockout 024 036 24x 24 0 14 0 15 tag 042 060 30 x 30 0 10 0 11 0 12 0 13 0 14 0 15 0 16 0 17 0 18 Remove the top panel 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 Table 11 Accessory Electric Heat Pressure Drop noticed disassemble the connection clean all the parts restrip the in wg wire end and reassemble the connection properly and securely CFM on EDT iro kw 600 800 1000 1200 1400 1600 1800 2000 2200 aid 0 06 0 08 0 10 0 13 0 15 0 18 0 20 0 23 0 25 1 Remove all obstructions including weeds and shrubs that inter fere with the airflow through the outdoor coil Straighten bent fins 00021 with a fin comb If coated with dirt or lint clean the coils with a vacuum cleaner using a 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 outdoor 16 Fig 12 Outdoor Fan Adjustment 024 048 Size Check to ensure no wires are touching refrigerant tubing or sharp shee
4. Check defrost time settings Reset as necessary Check defrost temperature switch Replace as necessary Air in refrigerant 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 outdoor coil Clean coil Refrigerant overcharged Recover excess refrigerant Air in refrigerant system Recover refrigerant evacuate system and re charge Outdoor or indoor air restricted or air is recirculating Determine cause and correct Head pressure too low Low refrigerant charge Check for leaks repair and recharge Compressor valves leaking Replace compressor Restriction in liquid tube Remove restriction Excessive suction pressure High heat load Check for source and eliminate Compressor valves leaking Replace compressor Refrigerant overcharged Recover excess refrigerant Suction pressure too low Dirty air filter cooling Replace Filter Low refrigerant charge Check for leaks repair and recharge Metering device or low side restricted Remove source of restriction Insufficient indoor airflow cooling Increase air quantity Check filter replace if necessary Temperature too low in conditioned area cooling Outdoor ambient below 40 F cooling Reset thermostat Install low ambient ki
5. HEATING amp COOLING 50ZHA024 060 Packaged Heat Pump Units Visit www carrier com Installation Start Up and Service Instructions NOTE Read the entire instruction manual before starting the installation TABLE OF CONTENTS SAFETY CONSIDERATIONS ccena 1 INTRODUCTION 5er obe e 2 RECEIVING AND INSTALLATION 2 Check 2 IDENTIFY UNIT nectit tror erm dde 2 INSPECT senten e 2 Provide Unit Support J 2 SLAB MOUNT temet steer pe v EE 2 GROUND MOUNT ee Ee ds 2 Provide C leara ces scs rene e vere aS OS 2 Place Unito Ria RS TREE IER 2 Select and Install Ductwork seseriai 2 CONVERTING HORIZONTAL DISCHARGE UNITS TO DOWNFLOW VERTICAL DIS CHARGE rer teer eee ii ox sies 4 Provide for Condensate Disposal d Install Electrical Connections sissien 5 HIGH VOLTAGE CONNECTIONS 5 ROUTING POWER LEADS INTO UNIT 6 CONNECTING GROUND LEAD TO UNIT GROUND 6 ROUTING CONTROL POWER WIRES 6 ACCESSORY ELECTRIC HEAT WIRING 6 PRE START UPD ecrire ethos oit re Re reis 6 STARTUP etr P E T Check fo
6. free from obstructions and adjusted properly 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 Airflow can be changed by changing the 24 volts lead connections of the blower motor Unit 50ZHA blower motors are factory wired for rated airflow operation FOR 208 230 V BLOWER MOTORS The motor lead speed connections are as follows SIZE RATED AIRFLOW HIGH AIRFLOW 024 Tap 1 Tap 3 030 Tap 2 Tap 4 036 Tap 1 Tap 3 042 Tap 2 Tap 4 T SCHEMATIC BLK E C BLK DR 6 DB 208 230 1 60 MAXIMUM WIR BL 01 BLK SIZE 2 AWG POWER ny USED WITH _ EQUIP GND L HEA OPTION ONLY OMPRESSOR PLUG USED WITH HEATER OPTIONS SKW 024 042 2AWG MAX WIRE OFM 30 AMP FOR 5 KW USED WITH ACCESSORY ONL LY USED WITH HEATER OPTIO 5KW 048 060 10KW 024 060 BLK iih W29 BRN 2 0 MAX WIRE USED WITE ACCESSORY W23 BRN ELECT HEAT OPTION ONLY USED WITH HEATER OPTIONS 15KW 030 060 20KW 042 060 210 MAX WIRE ELECT ACCESSSORY ELECTRIC HEAT HRI 5 KW WHT HR1 2 3 4 4 20 KW viO PNK HRI amp 2 10 KW GRY HR1 2 8 3 15 KW BRN DIP SWITCH SETTINGS DEFAULT 30 MINUTES 60 MINUTES 90 MINUTES 120 MINUTES UNIT COMPONENT ARRANGEMENT OUTDOOR FAN FIELD
7. x LOW VOLTAGE DISCONNECT ENTRY pi PER A UNIT AND E 2 COMPOSITE ELECTRIC RUSTPROOF BASEPAN HEAD Power Wiring CONDENSATE Control Wiring CTION Condenser Airflow Evaporator Airflow Separate disconnect per National Electrical Code required for electric heater when single point conection is not used C00008 Fig 4 Typical installation 1 25mm MIN TRAP y OUTLET Y A 2 50mm MIN C99013 Fig 5 Condensate Trap Using Tubing TRAP OUTLET 2 C00009 Fig 6 PVC Condensate Trap Table 3 Minimum Airflow for Safe Electric Heater Operation CFM SIZE 024 030 036 042 048 060 600 750 900 1050 1200 1500 A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in unit component damage Operation of unit on improper line voltage consti tutes abuse and may cause unit damage that could affect warranty ROUTING POWER LEADS INTO UNIT Use only copper wire between disconnect and unit The high voltage leads should be in a conduit until they enter the unit conduit termination at the unit must be watertight Run the high voltage leads through the hole on the control box side of the unit see Fig 7 for location When the leads are inside the unit run leads to the control box Fig 8 For single phase units connect leads to the black and yellow wires see Fig 9
8. EXPLOSION ELECTRICAL SHOCK CUT HAZ that fasten the housing to the duct panel assembly ARD Failure to follow these warnings could result in serious personal injury death and or property damage 1 Turn off electrical power to the unit and install lockout tag b Remove the side access panel and unscrew the mounting bracket that fastens the blower housing to the internal partition panel fo the control box assembly c Make sure that the blower housing is supported by hand before completely removing the mounting bracket before performing any maintenance or service on the unit Use extreme caution when removing panels and parts As with any mechanical equipment personal injury can result from sharp edges etc Never place anything combustible either on or in contact with the unit Step 1 Air Filter NOTE Never operate the unit without a suitable air filter in the return air duct system Always replace the filter with the same size as originally installed See Table 2 for recommended filter sizes Inspect air filter s at least once each month and replace throwaway type or clean cleanable type at least twice during each cooling season or whenever the filters become clogged with dust and lint Replace filters with the same dimensional size and type as originally provided when necessary Step 2 Unit Top Removal Outdoor Coil Side NOTE When performing maintenance or service procedures that require removal of
9. Line Pressure kPa OD Temp C 361 370 387 405 423 442 462 482 502 523 544 56 589 612 636 7 11 13 15 18 21 13 12 14 16 19 21 18 12 14 17 19 21 24 24 13 16 19 22 24 29 12 14 17 20 22 35 10 12 14 17 19 41 10 12 14 16 18 46 9 11 13 14 16 52 10 11 13 15 COOLING OPERATION SIZES 024 042 With a call for cooling Y Y2 the indoor fan energizes immedi ately whereas the contactor energizes after a 5 minute time delay in case of initial start up starting the compressor and the outdoor fan motor When the cooling demand is met Y Y2 de energizes shutting the compressor indoor fan and the outdoor fan COOLING OPERATION SIZES 048 AND 060 These units utilize a 2 stage indoor thermostat With a first stage call for cooling Y1 the indoor fan low stage energizes immediately whereas the contactor energizes after a 5 minute time delay in case of an initial start up starting the compressor low stage and the outdoor fan motor If the low stage operation cannot satisfy the cooling demand the second stage cooling Y2 ener gizes switching the compressor into high stage cooling through energizing an internal solenoid valve inside the scroll compressor and switching the indoor fan into high stage When second stage cooling is satisfied Y2 de energizes switching the compressor and the indoor fan into low stage cooling When the low stage cooling demand is met 1 d
10. SPLICE FIELD SELECTABLE OPTIONS FOR TIME PERIOO SECTION TERMINAL MARKED CONTACTOR BETWEEN DEFROST CYCLES MINUTES Tat PRE wi HUT OFF Fi Fi T 2 M UNMARKED S CACC usce Init Ton In THE QUIET SHIFT Qu CRANK CASE HEATER posit SPLICE MARKED SPEED PEREO TEST PINS USE METAL OBJECT COMPRESSOR INDOOR FAN CONTROL BOX AREA O CAT WIRING c aed the e Lat w eet Oen SECTION SECTION FIELD CONTROL WIRING DEFROST BOARD 17 MOMENTARILY SHORT PINS AND RELEASE TO BYPASS COMPRESSOR OFF DELAT FIELD POWER WIRING DE NOST 21 SHORT FOR SEC AND RELEASE FOR FORCED DEFROST OR OPTIONAL CONTROL BOARD 3 PERMANENT SHORT WILL BE IGNORED GROUND DEFROST WILL TERMINATE IN 30 SEC IF DFT OPEN v1 10 INDICATE COMMON HEATER RELAY DEFROST WILL TERMINATE MORALLY iF DFT IS CLOSED POTENTIAL ONLY 1 Fad MOTOR Es RD NOT TO REPRESENT WIRING LOW PRESSURE SWITCH OUTDOOR FAN MOTOR REVERSING VALVE SOLENOID 55 TRAN TRANSFORMER 5 H a TEE ai rH Fame UNE REPLACED R NEC TYPE 90 DEGREE C WIRE OR FAN SEQUENCE 11 12 COMPRESSOR DELAY SEE PRICE PAGES FOR THERMOSTAT AND SUBBASES 1 USE 75 DEGREE COPPER CONDUCTORS FOR FIELD INSTALLATION 4 FACTORY WIRING FOR SPEED SELECTOR PLUG 0 0 5SEC T MIN a OPENS 6 ENERGIZED DE ENERGIZED cLoses TSAT 2 4 ALL EXCEPT 024 5 DEFROST TIMER TO BE SET AT 60 MINUTES EXCEPT Fig 11
11. Temperature DB WB Return Air Temperature DB WB Cooling Supply Air DB WB PRESSURES Heating Mode Refrigerant Suction psig Suction Line Temp Refrigerant Discharge psig Discharge Tempt Verify Refrigerant charge using charging tables Measured at suction inlet to compressor tMeasured at liquid line leaving outdoor coil Copyright 2005 CARRIER Corp 7310 W Morris St Indianapolis IN 46231 50zhai1si Manufacturer reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations 2 4 PC 1014 Printed in U S A Catalog 50ZHA 1SI Pg 20 9 05 Replaces New
12. ft 3 17 3 17 4 17 4 17 4 17 4 17 4 3 4 9 4 9 6 1 4 9 6 1 Evaporator Blower Direct Drive Nominal Airflow CFM 800 1000 1200 1400 1600 1875 Size in 10x8 10x8 11x9 11x9 11x10 11x10 Motor HP RPM 1 2 1050 1 2 1050 3 4 1050 3 4 1050 1 1050 1 1050 CONNECTING DUCT SIZES Round Supply Air in 14 Return Air in 14 Return Air Filters in Throwaweiy 24 x 24 24 x 24 24 x 24 24 x 30 30 x 30 30 x 30 Required filter sizes shown are based on the ARI Air Conditioning and Refrigeration Institute rated airflow at a velocity of 300 ft min for throwaway type or 450 ft min for high capacity type Recommended filters are 1 in thick Step 7 Install Electrical Connections A CAUTION UNIT DAMAGE HAZARD Failure to follow these precautions may result in damage to the unit being installed 1 Make all electrical connections in accordance with NEC ANSI NFPA latest edition and local electrical codes governing such wiring In Canada all electrical connec tions must be in accordance with CSA standard C22 1 Canadian Electrical Code Part 1 and applicable local codes Refer to unit wiring diagram A WARNING 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
13. the Start Up checklist to ensure proper start up procedures are followed OUTDOOR COIL INDOOR COIL ACCUMULATOR COMPRESSOR Check Valves Open A B Closed C Open D Closed LEGEND LCS Loss of Charge Switch 1 Acutrol Metering Device Check Valve Arrow indicates direction of flow HEATING CYCLE 1 Hot gas from compressor flows through the 4 way valve and is directed to the cooling liquid line check valve It is then condensed and directed through subcooling circuits and out to the strainer and the check valve the heating liquid line 2 The refrigerant then feeds the outdoor coil through the Acutrol metering device on each circuit 3 Each circuit evaporates the refrigerant and the circuits are com bined in the outdoor header with some of the circuits flowing through the check valve 4 The refrigerant then flows through the 4 way valve accumulator and back to the compressor Fig 14 Typical Heat Pump Operation Heating Mode OUTDOOR COIL INDOOR COIL ACCUMULATOR COMPRESSOR Check Valves Closed Open Closed gt LEGEND LCS Loss of Charge Switch Acutrol Metering Device Check Valve Arrow indicates directio
14. unit at a cooling airflow that is less than 350 cfm for each 12 000 Btuh of rated cooling capacity Evaporator coil frosting may occur at airflows below this point Dashes indicate portions of the table that are beyond the blower motor capacity or are not recommended RATED AIRFLOW HIGH AIRFLOW SIZE Low High Low High Stage Stage Stage Stage 048 Tap 1 Tap 3 Tap 2 Tap 4 060 Tap 1 Tap 3 Tap 2 Tap4 Step 5 Unit Controls compressors have the following internal protection controls HIGH PRESSURE RELIEF VALVE This valve opens when the pressure differential between the low and high side becomes excessive LOSS OF CHARGE SWITCH Located on the outdoor liquid line is a low pressure switch which functions as a loss of charge switch This switch contains a Schrader core depressor This switch opens at 7 psig and closes at 22 psig No adjustment is necessary COMPRESSOR OVERLOAD This overload interrupts power to the compressor when either the current or internal temperature become excessive and automati cally resets when the internal temperature drops to a safe level 13 This overload may require up to 60 minutes or longer to reset therefore if the internal overload is suspected of being open disconnect the electrical power to the unit and check the circuit through the overload with an ohmmeter or continuity tester Step 6 Sequence of Operation FAN OPERATION The FAN switch on the thermostat con
15. water to ensure proper drainage d Make sure that all tools and miscellaneous loose parts have been removed LOW VOL TAGE WIRING ENTRY HOLE HIGHH WOL TAGE POWER WIRING ENTRY HOLE Fig 8 Control Box Wiring START UP Use the Start Up Checklist supplied at the end of this book and proceed as follows Step 1 Check for Refrigerant Leaks LOCATE AND REPAIR REFRIGERANT LEAKS AND CHARGE THE UNIT AS FOLLOWS 1 Using both high and low pressure ports locate leaks and reclaim remaining refrigerant to relieve system pressure 2 Repair leak following accepted practices NOTE Install a liquid line filter drier whenever the system has been opened for repair Step 2 Start Up Cooling Section and Make Adjustments CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in unit component damage Complete the required procedures given in the Pre Start Up section this page before starting the unit Do not jumper any safety devices when operating the unit Do not operate the compressor in cooling mode when the outdoor temperature is below 40 F Do not rapid cycle the compressor Allow 5 minutes between 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 sh
16. 129 124 2461 62 60 57 54 367 142 137 132 127 2530 64 61 58 55 280 121 116 111 106 1930 52 49 46 44 289 123 118 113 108 1992 53 51 48 45 298 125 120 115 110 2054 55 52 49 46 307 128 123 118 113 2116 56 53 50 48 317 130 125 120 115 2185 57 54 52 49 327 132 127 122 117 2254 59 56 53 50 337 135 130 125 120 2323 60 57 54 52 347 137 132 127 122 2392 61 58 56 53 357 139 134 129 124 2461 62 60 57 54 367 142 137 132 127 2530 64 61 58 55 b Inspect for oil at all refrigerant tubing connections and on a Make sure that outdoor fan blade is correctly positioned in 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 refrig erant leak is detected see following Check for Refrigerant Leaks section Inspect all field and factory wiring connections Be sure that connections are completed and tight Ensure wires do not contact refrigerant tubing or sheet metal edges d Inspect coil fins If damaged during shipping and handling carefully straighten fins with a fin comb 3 Verify the following conditions fan orifice Top edge of blade should be 3 125 in down from outdoor coil outlet grille size 024 048 See Fig 12 or hub should be 0 708 in away from motor end bell size 060 See Fig 13 See Outdoor Fan Adjustment section b Make sure that air filter is in place c Make sure that condensate drain trap is filled with
17. 26 0 30 0 78 2 83 2 90 100 FLA Full Load Amps LRA Locked Rotor Amps MCA Minimum Circuit Amps MOCP Maximum Overcurrent Protection L RLA Rated Load Amps C US NOTES 1 In compliance with NEC National Electrical Code requirements for multimotor and combination load equipment refer to NEC Articles 430 and 440 the overcurrent protective device for the unit shall be Power Supply fuse The CGA Canadian Gas Association units may be fuse or circuit breaker 2 Minimum wire size is based on 60 C copper wire If other than 60 C wire is used or if length exceeds wire length in table determine size from NEC 12 Table 7 Dry Coil Air Delivery Horizontal Discharge Deduct 10 percent for 208 Volt Operation 50ZHA SPEED TAP WATTS C F M EXTERNAL STATIC PRESSURE Watts 024 C F M Watts C F M Watts C F M 030 Watts C F M Watts 036 C F M Watts C F M Watts 042 C F M Watts C F M Watts C F M Watts C F M Watts C F M Watts C F M Watts C F M Watts 060 C F M Watts C F M Watts C F M Air delivery values are based on operating voltage of 230 v dry coil without filter or electric heater Deduct wet coil filter and electric heater pressure drops to obtain external static pressure availabe for ducting Do not operate the
18. 7 and that the air filter is clean When necessary refer to Indoor Airflow and Airflow Adjustments section to check the system airflow Step 9 Metering Devices Refrigerant cooling metering device is an Accurator 024 042 or TXV 048 and 060 located upstream of the indoor coil distributor assembly Refrigerant heating mode metering device is an Accu rater located upstrem of the outdoor coil distributor assembly Step 10 Lubrication COMPRESSOR The compressor is charged with the correct amount of oil at the factory FAN MOTOR BEARINGS Fan motor bearings are perma nently lubricated No further lubrication of outdoor or indoor fan motors is required Step 11 Liquid Line Strainer The liquid line strainer to protect metering device is made of wire mesh and is located in the liquid line on the inlet side of the metering device Check valves are also located in the liquid lines near the strainers The Strainers are the larger of the two components Step 12 High Flow Valves Located on the compressor hot gas and suction tubes are High Flow Valves Large black plastic caps distinguish these valves with O rings located inside the caps These valves cannot be accessed for service in the field Ensure the plastic caps are in place and tight or the possibility of refrigerant leakage could occur TROUBLESHOOTING Use the Troubleshooting Cooling and Heating guide if problems occur with these units START UP CHECKLIST Use
19. 81302 905539902 LINN 40 66 ce WO01108 1 18 LINN 40 WOLLOG 86 06 0 66 1 1102 4000100 MAA 3015 1331 en Table 1 Unit Specifications UNIT HEIGHT UNIT ELECTRICAL CHARACTERISTICS IN MM CENTER OFGRAVITY Ib kg A X Y 7 50ZHA024 208 230 1 60 293 133 30 13 765 14 0 356 19 0 483 12 0 305 50ZHA030 208 230 1 60 324 147 34 13 867 14 0 356 19 0 483 12 0 305 50ZHA036 208 230 1 60 377 171 42 13 1070 14 0 356 19 0 438 19 8 503 50ZHA042 208 230 1 60 389 177 42 13 1070 14 0 356 19 0 483 21 9 556 50ZHA048 208 230 1 60 384 175 42 13 1070 14 0 356 19 0 483 19 8 503 502 060 208 230 1 60 433 197 42 13 1070 14 0 356 19 0 483 21 9 556 are field installed and must removed from the indoor blower compartment prior to start up even if they are not used for installation When designing and installing ductwork consider the following A CAUTION UNIT DAMAGE HAZARD Failure to follw this caution may result in damage to unit components When connecting ductwork to units do not drill deeper than 3 4 inch in shaded area shown in Fig 3 or coil may be damaged All units should have field supplied filters installed in the return air side of the unit Recommended sizes for filters are shown in Table 2 e Avoid abrupt duct size increases and reductions Abru
20. A Typical Unit Electrical Diagram Sizes 024 042 10 SCHEMATIC BLK ae BLK 208 230 1 60 MAXIMUM WIR SIZE 2 AWG POWER USED WITH E ACCESSORY EQUIP_GND ELECT HEAT OPTION ONLY USED WITH HEATER OPTION COMP SOLENOID 5KW 024 042 2AWG MAX WIRE 30 AMP FOR 5 KW USED WITH ACCESSORY ELECT HEAT OPTION ONLY USED WITH HEATER OPTIO 5KW 048 060 10KW 024 060 W29BRN 210 MAX WIRE USED WITH ACCESSORY ELECT HEAT OPTION ONLY USED WITH HEATER OPTIONS 15KW 030 060 20KW 042 060 210 MAX WIRE ELECT HEAT ACCESSSORY ELECTRIC HEAT HRI 5 KW WHT HR1 2 3 8 4 20 KW VIO PNK HRI amp 2 10 KW GRY WR1 2 8 3 15 KW BRN DIP SWITCH SETTINGS COEF AULTO 30 MINUTES 60 MINUTES 90 MINUTES 120 MINUTES LEGEND rana o contactor quis ne TERWINAL MARKED 9 TERMINAL vato CAROSI Arean MTA On ano ta Tat Swift SPLICE MARKED GRANT CASE HEATER sro TC JUMPERED TEST PINS USC METAL OBJECT FACTORY WIRING c COMPRESSOR TIME DELAY v FIELD SPEEO UP CYCLE COMPRESSOR INDOOR FAN FIELD CONTROL WIRING DEFROST BOARD SECTION SECTION UNIT COMPONENT ARRANGEMENT i a AND RELEASE TO BYPASS FIELD POWER WIRING DEFROST THERMOSTAT i ACCESSORY OR OPTIONAL DEFROST RELAY HEC 0878087 FAN CONTROL BOARD GROUND DEFROST WILL TERMINATE 30 SEC IF D
21. CA MOCP CKT BKR 18 6 18 6 25 25 3 8 5 0 18 1 20 8 41 2 44 7 45 50 024 208 230 1 60 187 253 10 9 54 0 0 9 4 7 5 10 0 36 1 41 7 63 8 70 7 _ 60 70 5 4 7 2 26 0 30 0 51 1 56 1 50 50 1 1 21 8 21 8 30 30 3 8 5 0 18 1 20 8 44 4 47 9 50 50 030 208 230 1 60 187 253 13 5 72 5 0 9 4 1 7 5 10 0 36 1 41 7 57 0 73 9 70 70 11 3 15 0 54 2 62 5 89 5 100 0 90 100 5 4 7 2 26 0 30 0 54 3 59 3 60 60 29 4 29 4 35 35 3 8 5 0 18 1 20 8 52 0 55 4 60 60 036 208 230 1 60 187 253 17 5 88 0 1 5 6 0 7 5 10 0 36 1 41 7 74 5 81 5 80 80 11 3 15 0 54 2 62 5 97 1 107 5 100 100 5 4 7 2 26 0 30 0 61 9 66 9 70 70 1 31 7 31 7 40 40 3 8 5 0 18 1 20 8 54 3 57 8 60 70 7 5 10 0 36 1 41 7 76 9 83 8 80 90 042 ME M HMM MM E ME 11 3 15 0 542 625 99 4 109 9 2 100 110 15 0 20 0 72 2 83 3 122 0 135 9 110 150 5 4 7 2 26 0 30 0 63 2 69 2 70 80 1 1 40 0 40 0 50 50 3 8 5 0 18 1 20 8 62 6 66 1 80 80 7 5 10 0 36 1 41 7 85 1 92 1 100 100 048 208 230 1 60 187 253 24 7 116 0 1 5 LT 11 3 15 0 54 2 62 5 107 7 118 1 _ 110 125 15 0 20 0 72 2 83 3 130 3 144 2 125 125 5 4 7 2 26 0 30 0 72 5 77 5 90 90 45 7 45 7 60 60 3 8 5 0 18 1 20 8 68 2 71 7 90 90 7 5 10 0 36 1 41 7 90 8 97 8 E 100 110 060 208 230 1 60 187 253 28 0 118 0 3 0 7 7 11 3 15 0 54 2 62 5 113 4 123 8 E 125 125 15 0 20 0 72 2 83 3 135 9 149 9 125 150 5 4 7 2
22. FIRE EXPLOSION ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury death and or property damage Before performing service or maintenance operations on system turn off main power to unit and install lockout tag Turn off accessory heater power switch if applicable Recognize safety information This is the safety alert symbol N When you see this symbol in instructions or manuals be alert to the potential for personal injury Understand the signal words DANGER WARNING CAUTION and NOTE 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 a hazard 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 highlight suggestions which will result in enhanced installation reliability or operation These instructions cover minimum requirements and conform to existing national standards and safety codes In some instances these instructions exceed certain local codes and ordinances especially those that may not have kept up with changing residen tial construction practices We require these instructions as a minimum for a safe installation INTRODUCTION 50ZHA heat pump units are fully self contained and designed for outdoor installation See Fig 1 As shown in
23. FT OPEN 10 INDICATE COMMON HEATER RELAY DEFROST WILL TERMINATE NORMALLY IF OFT 15 CLOSED POTENTIAL ONLY 1 INDOOR FAN MOTOR Tan WOT TO REPRESENT WIRING LOW PRESSURE SWITCH OUTDOOR FAN MOTOR REVERSING VALVE SOLENOID TRANSFORMER E MUST BE REPLACED WITH TIPE 90 DEGREE C SIRE OR DISCONNECT t s SEQUENCE 11 12 COMPRESSOR DELAY en mii o U LO INSTALLA 4 DEFROST TIMER T T AT T 0 T90 0 5 SEC T 195 MIN DEFROST TIMER 10 BE SET AT GO MINUTES ENERGIZED DE ENERGIZED TSAT Fig 11B Typical Unit Electrical Diagram Sizes 048 060 11 UNIT FAN LV CONTROL PLU BOARD UNIT POWER BLK WIRING YEL RELAY 1 foo AUTO LIMIT o4 Fo RELAY 2 i l gt AUTO LIMIT CIRCUIT BREAKERS SHOWN WITH SINGLE POINT KIT RELAY 3 4 AUTO LIMIT 1 4 Fo Lowo YEL l RELAY 4 eLa AUTO LIMIT o4 Fo BLK X A05209 Fig 11C Accessory Electric Heater Wiring Table 6 Electrical Data 50ZHA VOLTAGE COMPRESSOR ELECTRIC HEAT SINGLE POINT POWER SUPPLY UNIT SIZE RANGE OFM IFM V PH HZ 50ZHA FLA FLA FUSE OR MIN MAX RLA LRA Nominal KW FLA M
24. Fig 2 units are shipped in a horizontal discharge configuration for installation on a ground level slab units can be field converted to downflow discharge configurations for rooftop applications with a field supplied plenum RECEIVING AND INSTALLATION Step 1 Check Equipment IDENTIFY UNIT The unit model number and serial number are stamped on the unit identification plate Check this information against shipping pa pers Verify that unit voltage and amperage listed on unit rating plate agree with power supplied for equipment INSPECT SHIPMENT Inspect for shipping damage while unit is still on shipping pallet If unit appears to be damaged or is torn loose from its securing points 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 Carrier Distributor if any item is missing To prevent loss or damage leave all parts in original packages until installation Step 2 Provide Unit Support SLAB MOUNT Place the unit on a rigid level surface suitable to support the unit weight A concrete pad or a suitable fiberglass mounting pad is recommended The flat surface should extend approximately 2 in beyond the unit casing on the 2 sides The duct connection side and condensate drain connection sides should be flush with the e
25. L SHOCK HAZARD Failure to follow this warning could result in personal injury or death Before performing service or maintenance operations on system turn off main power to unit and install lockout tag Turn off accessory heater power switch if applicable Units are dedicated side supply products They are not convertible to vertical air supply A field supplied plenum must be used to convert to vertical air discharge Step 6 Provide for Condensate Disposal NOTE Be sure that condensate water disposal methods comply with local codes restrictions and practices Unit removes condensate through a 1 3 64 in ID hole using 3 4 in OD piping or tubing which is located at the end of the unit See Fig 2 for location of condensate connection 19 17 3 92 4 A05195 Fig 3 Area Not to Be Drilled More Than 3 4 in 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 condensate trap at end of condensate connection to ensure proper drainage Make sure that the outlet of the trap is at least 1 in lower than the drain pan condensate connection to prevent the pan from overflowing Prime the trap with water When using a gravel apron make sure it slopes away from the unit If the installation requires draining the condensate water away from the unit install a 2 in
26. als CAUTION OPERATIONAL HAZARD Failure to follow this caution may result in unit component damage Do not restrict outdoor coil airflow An air restriction at either the outdoor air inlet or the fan discharge can be harmful to compressor life Step 4 Place Unit Unit can be moved with the rigging holds provided in the unit base Refer to Table 2 for operating weights Use extreme caution to prevent damage when moving the unit Unit must remain in an upright position during all moving operations The unit must be level with in 1 4 for proper condensate drainage the ground level pad must be level before setting the unit in place When a field fabricated support is used be sure that the support is level and that it properly supports the unit Step 5 Select and Install Ductwork The design and installation of the duct system must be in accordance with the standards of the NFPA National Fire Protection Associa tion for installation of nonresidence type air conditioning and ventilating systems e NFPA90A or residence type NFPA90B and or local codes and 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 Refrigera tion and Air Conditioning Engineers recommendations Use the duct flanges provided on the supply and return air openings on the side of the unit See Fig 2 for connect
27. an runs Compressor cycles other than normally satisfying thermostat Faulty wiring or loose connections in compressor circuit Check wiring and repair or replace Compressor motor burned out seized or internal overload open Determine cause Replace compressor Defective run start capacitor overload start relay Determine cause and replace Low input voltage 20 percent low Refrigerant overcharge or undercharge Loss of Charge Switch open Determine cause and correct Recover refrigerant evacuate system and re charge to capacities shown on nameplate Evaluate unit for possible refrigerant leak Defective compressor Replace and determine cause Insufficient line voltage Determine cause and correct Blocked outdoor coil cooling Defective run start capacitor overload or start relay Defective thermostat Determine cause and correct Determine cause and replace Replace thermostat 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 Thermostat set too low Reset thermostat Low refrigerant charge Locate leak repair and recharge Leaking valves in compressor Replace compressor Frosted outdoor coil with incorrect defrost operation heating
28. dge of the flat surface A 6 in wide gravel apron should be used around the flat surface to prevent airflow blockage by grass or shrubs Do not secure the unit to the flat surface except where required by local codes The unit should be level to within 1 4 inch This is necessary for the unit drain to function properly GROUND MOUNT The unit may also be installed directly on the ground if local codes permit Place unit on level ground prepared with gravel for condensate discharge HURRICANE HOLD DOWN Contact you local distributor for specific hurricane hold down details and PE Professional Engineer certification when required Step 3 Provide Clearances The required minimum service clearances and clearances to combustibles are shown in Fig 2 Adequate ventilation and outdoor coil air must be provided The outdoor fan pulls air through the outdoor coil and discharges it through the fan on the top cover 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 above the unit top The maximum horizontal extension of a partial overhang must not exceed 48 inches Do not place the unit where water ice or snow from an overhang or roof will damage or flood the unit The unit may be installed on wood flooring or on Class A B or C roof covering materi
29. e energizes shutting the compressor indoor fan and the outdoor fan HEATING OPERATION SIZES 024 042 With a call for heating Y 1 the indoor fan low stage energizes immediately whereas the contactor energizes after a 5 minute time delay in case of initial start up starting the compressor and the outdoor fan motor If Y Y2 cannot satisfy the heating demand the auxiliary or backup heat W2 energizes In case of staged heating W3 is energized if the demand is not met The highest airflow selected is run while the electric heat is in operation When heating demand is met W3 W2 and Y Y2 sequentially de energize shutting the compressor indoor fan and the outdoor fan HEATING OPERATION SIZES 048 AND 060 With a first stage call for heating Y 1 the indoor fan low stage energizes immediately whereas the contactor energizes after a 5 minute time delay in case of initial start up starting the compres sor low stage and the outdoor fan motor If the low stage oepration cannot satisfy the heating demand the second stage 14 heating Y2 energizes switching the compressor into high stage heating through energizing an internal solenoid valve inside the scroll compressor and switching the indoor fan into high stage The auxiliary or backup heat is controlled by a third stage W2 If the demand is not met W3 is energized in case of staged heating When heating demand is satisfied W3 W2 and Y2 sequentially de energize switching t
30. e mounting rails in the duct panel and install the mounting bracket back in its Step 5 Outdoor Fan position g Install the screws on the external side of the duct panel to CAUTION fasten duct panel with the housing UNIT OPERATIONAL HAZARD h Replace the side access panel Failure to follow this caution may result in damage to unit E components Pell Indoor Loil Condensate Keep the Outdoor fan free from all obstructions to ensure proper cooling operation Never place articles on top of the Inspect the outdoor coil indoor coil and condensate drain pan at unit least once heating and cooling season Proper inspection and cleaning requires the removal of the unit top See Unit Top 1 Shut off unit power supply and install lockout tag Removal section 2 Remove outdoor fan assembly grille motor motor cover and fan by removing screws and flipping assembly onto unit Table 10 Filter Pressure Drop in wg top cover unir FILTER CFM 3 Loosen fan hub setscrews SIZE SIZE iN 500 700 1000 1100 1200 1300 1400 4 Adjust fan height as shown in Fig 12 or 13 024 036 24 x 24 0 06 0 07 0 08 0 08 0 09 0 09 0 09 0 10 0 11 0 12 5 Tighten setscrews 042 060 30x30 fn _ _ _ _ _ s O08 008 6 Replace outdoor fan assembly Step 6 Electrical Controls and Wiring UNIT jd Inspect and check the electrical controls and wiring annually Be SIZE IN
31. emperature 75 24 82 28 85 29 95 35 105 41 048 17 5 9 7 17 9 4 16 5 9 2 16 8 9 14 7 8 060 21 11 7 20 5 11 4 20 11 1 19 10 6 16 8 9 Table 5 Required Liquid Line Temperature REQUIRED LIQUID LINE TEMPERATURE FOR A SPECIFIC SUBCOOLING R 22 Required Subcooling F Required Subcooling C Pressure psig 5 10 1 20 Pressure kPa 3 6 8 CO 1 134 71 66 61 56 924 24 22 19 16 141 74 69 64 59 972 26 23 21 18 156 80 75 70 65 1075 30 27 24 21 163 83 78 73 68 1124 31 28 26 23 170 86 81 76 71 1172 33 30 27 24 177 89 84 79 74 1220 34 31 29 26 184 91 86 81 76 1268 36 33 30 27 191 94 89 84 79 1317 37 34 31 29 198 96 91 86 81 1365 38 36 33 30 205 98 93 88 83 1413 40 37 34 31 213 101 96 91 86 1468 41 38 36 33 221 104 99 94 89 1524 43 40 37 34 229 106 101 96 91 1579 44 41 38 36 237 108 103 98 93 1634 45 42 40 37 245 111 106 101 96 1689 47 44 41 38 253 113 108 103 98 1744 48 45 42 40 262 116 111 106 101 1806 49 46 44 41 271 118 113 108 103 1868 51 48 45 42 280 121 116 111 106 1930 52 49 46 44 289 123 118 113 108 1992 53 51 48 45 298 125 120 115 110 2054 55 52 49 46 307 128 123 118 113 2116 56 53 50 48 317 130 125 120 115 2185 57 54 52 49 327 132 127 122 117 2254 59 56 53 50 337 135 130 125 120 2323 60 57 54 52 347 137 132 127 122 2392 61 58 56 53 357 139 134
32. he compressor and the indoor fan into low stage heating When the low stage heating demand is met de energizes shutting the compressor indoor fan and the outdoor fan CONTINUOUS FAN With the continuous Indoor fan option selected on the thermostat G is continuously energized In case of 024 042 units the selected airflow setting is provided In case of 048 and 060 units the system runs low stage Y1 airflow for continuous fan operation DEFROST Defrost board DB is a time and temperature control which includes a field selectable time period between checks for defrost 30 60 90 and 120 minutes The time period is factory set at 60 minutes and should only be adjusted by a trained service person Electronic timer and defrost cycle start only when contactor is energized and defrost thermostat DFT is closed Defrost mode is identical to Cooling mode The outdoor fan motor stops because of OF1 and OF2 contacts opening on the defrost board a bank of optional electric heat turns on to warm air supplying the conditioned space ELECTRIC RESISTANCE HEATING If accessory electric heaters are installed on a call for Emergency Heat the thermostat energizes W which energizes the heater relay and in turn energizes the electric heaters The IFR is energized which starts the indoor fan motor If the heaters are staged W2 is energized when the second stage of heating is required When the need for heating is satisfied t
33. he heater and IFM are de energized MAINTENANCE To ensure continuing high performance and to reduce the possi bility 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 To WARNING troubleshoot cooling of units refer to Troubleshooting chart in ELECTRICAL SHOCK HAZARD back of book Failure to follow this warning could result in personal injury NOTE TO EQUIPMENT OWNER Consult your local dealer or death about the availability of a maintenance contract Disconnect and tag electrical power to the unit before removing top A WARNING Only qualified service personnel should perform maintenance and FIRE EXPLOSION ELECTRICAL SHOCK HAZARD service procedures that require unit top removal Failure to follow this warning could result in personal injury Refer to the following top removal procedures death or property damage 1 The ability to properly perform maintenance on this equip ment requires certain expertise mechanical skills tools and equipment If you do not possess these do not attempt to 3 Lift top from unit carefully Set top on edge and make sure perform any maintenance on this equipment other than those that top is supported by unit side that is opposite duct or procedures recommended in the User s Manual plenum side Remove screws on unit top cover surface Save all screws 2 Re
34. ion sizes and locations The 14 in round duct collars are shipped inside the unit attached to the base pan in the indoor blower compartment They SO9NIN340 LONG 00 v1 0798 0290 uva 19181 979 7 0r 6 NI 38V 1 NI SNOISN3WIQ 3oNYuV312 ON SJYINOJY 3QvOlUNVG YO FING 310VAON34 V 39uvHOSIO 5000110 YTV 30 NOILYIN941934 1N3A3Ud Ol Q3NIVINIVM 3 00961 0 P016 00 cv 8 9901 NI Su313NT TTIN oooo NI Su31 AT TTIN 1773015 AYINI 3 04 C930 S1N3H SONTNAdO LINQ 5 2015 AuIN u3H10 ONY STIVM 313 ac 3015 Aul on 40 37811508002 32NVUV312 310N YIMOIY JIN 803 1d32X1 3MOd HLIM LINN 30 3015 21180940 LINN 30 3015 qol 19 G3ulno3u MOd S39vjunS CIONNOYD QNOD YO 42018 ONY LINN NS QIANNOYINN ONY LINN 3 u3MOd SLINn N33M138 S39NVuV319 G3ulfo3s JLISOddO LINN 40 30IS LONG HLIM LINN 30 3015 inier TANN 30 NOLLOR INA 30 401 OL 5 19 G3Ulno3u NOII23NNOO NIVUO 31VSN3QNOD MIA 30S LHOW ao uae x a1 882 062 9 19 61 090 vZ0WHZOS suoisueuiiq eseg yun z B14 LNOYS AYLNG 39V1 10A MOT 890 IQ ce 1804 30IAU3S OL AXINI 01313 13NYd 55322 Y3M018 20 621 29 c L L 13NYd 55399 10
35. lohi Liquid Lane Strainer 5 tertiis High Flow Valves setae ce cocer m Dis TROUBLESHOOTING 25 ftir 17 START UP CHECKLIST oeste ient otn enin thon enn 17 NOTE TO INSTALLER Before installation READ THESE INSTRUCTIONS CAREFULLY AND COMPLETELY Also make sure the User s Manual and Replacement Guide are left with the unit after installation SAFETY CONSIDERATIONS Installation and servicing of air conditioning equipment can be hazardous due to system pressure and electrical components Only trained and qualified workers should install repair or service air conditioning equipment Untrained workers can perform basic maintenance functions of cleaning coils and filters All other operations should be performed by trained service people When working on air conditioning equipment pay attention to precautions in the literature tags and labels attached to the unit and other safety precautions that may apply Manufacturer reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations Book 1 4 PC 101 Tab 6 Printed in U S A Catalog No 50ZHA 1SI Pg 1 9 05 Replaces New Follow all safety codes Wear safety glasses and work gloves Use quenching cloth for unbrazing operations Have fire extinguisher available for all brazing operations A WARNING
36. move screws on unit top cover flange Save all screws 4 Carefully replace and secure unit top to unit using screws removed in Steps 1 and 2 when maintenance and or service procedures are completed The minimum maintenance requirements for this equipment are as follows 1 Inspect air filter s each month Clean or replace when necessary Step 3 Indoor Blower and Motor 2 Inspect indoor coil outdoor coil drain pan and condensate For longer life operating economy and continuing efficiency drain each cooling and heating season for cleanliness Clean clean accumulated dirt and grease from the blower wheel and when necessary motor annually 3 Inspect blower motor and wheel for cleanliness each cooling and heating season Clean when necessary For first heating season inspect blower wheel bimonthly to determine proper A WARNING cleaning frequency ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury 4 Check electrical connections for tightness and controls for proper operation each cooling season Service when neces sary or death Disconnect and tag electrical power to the unit before cleaning the blower wheel 5 Check the drain channel in the top cover periodically for blockage leaves insects Clean as needed To clean the blower wheel follow the following steps 1 Remove the blower housing WARNING a Remove the screws on the external side of the duct panel FIRE
37. n of flow COOLING CYCLE 1 Hot gas from compressor flows through the 4 way valve and is directed to the heating liquid line check valve It is then con densed and subcooled through converging circuits Refrigerant leaves the outdoor coil by way of the strainer and the check valve in the cooling liquid line 2 The refrigerant then feeds the indoor coil through the Acutrol metering device on each circuit 3 Each circuit evaporates the refrigerant and the circuits are com bined in the indoor coil header with some of the circuits flowing through the check valve 4 The refrigerant then flows through the 4 way valve accumulator and back to the compressor Fig 15 Typical Heat Pump Operation Cooling Mode 18 C95045 C95044 Table 12 Troubleshooting Cooling and Heating SYMPTOM CAUSE REMEDY Compressor and outdoor fan will not start Power Failure Call power company Loss of Charge Switch open Evaluate unit for possible refrigerant leak Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker Defective thermostat contractor transformer or control relay Replace component Insufficient line voltage Determine cause and correct Incorrect or faulty wiring Check wiring diagram and rewire correctly Thermostat setting too high Lower thermostat setting below room tempera ture Compressor will not start but outdoor f
38. nected and lockout tag is installed Relieve all pressure from both high and low pressure sides of the system before touching or disturbing anything inside terminal box if refrigerant leak is suspected around com pressor terminals Use accepted methods to recover refrig erant Never attempt to repair soldered connection while refrig erant 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 fol lows a Shut off electrical power to unit and install lockout tag b Relieve all refrigerant from system using both high and low pressure ports Use accepted methods to recover refrigerant Cut component connecting tubing with tubing cutter and remove component from unit Carefully unsweat remaining tubing stubs when neces sary Oil can ignite when exposed to torch flame Use the Start Up Checklist supplied at the end of this book and proceed as follows to inspect and prepare the unit for initial start up 1 Remove all access panels 2 Read and follow instructions on all DANGER WARNING CAUTION and INFORMATION labels attached to or shipped with unit Make the following inspections a Inspect for shipping and handling damages such as broken lines loose parts disconnected wires etc Table 4 Required Subcooling REQUIRED SUBCOOLING F C Model Size Outdoor Ambient T
39. pt 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 weathertight and airtight seal When electric heat is installed use fire proof 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 from the unit discharge connection flange into the ductwork Size ductwork for cooling air quantity cfm The minimum air quantity for proper electric heater operation is listed in Table 3 Heater limit switches may trip at air quantities below those recommended Insulate and weatherproof all external ductwork Insulate and cover with a vapor barrier all ductwork passing through conditioned spaces Follow latest Sheet Metal and Air Condi tioning Contractors National Association SMACNA and Air Conditioning Contractors Association ACCA minimum in stallation standards for residential heating and air conditioning systems e Secure all ducts to building structure Flash weatherproof and vibration isolate duct openings in wall or roof according to good construction practices Figure 4 shows a typical duct system with 50ZHA unit installed CONVERTING HORIZONTAL DISCHARGE UNITS TO DOWNFLOW VERTICAL DISCHARGE A WARNING ELECTRICA
40. r Refrigerant Leaks LOCATE AND REPAIR REFRIGERANT LEAKS AND CHARGE THE UNIT AS FOLLOWS 8 Start Up Cooling Section and Make Adjustments 8 CHECKING COOLING CONTROL OPERATION 8 Refrigerant Charge erecti ee pr ir erede 8 NO CHARGE v 2 tt LOW CHARGE COOLING HEATING MODE CHARGE Indoor Airflow and Airflow Adjustments 9 FOR 208 230 cce itin nr erts ger Reto 13 Unt Controls nce bete uere eerte emper or ree 13 HIGH PRESSURE RELIEF 13 LOSS OF CHARGE SWITCH COMPRESSOR OVERLOAD Sequence of Operation EAN OPERXATION i etre entia Pe REOR XE HEATING CONTINUOUS FAN throat ELECTRIC RESISTANCE HEATING nitro ehe eoe RENE EHE FERE dur Unit Top Removal Outdoor Coil Side A05194 Fig 1 Unit 50ZHA Indoor Blower and 15 Outdoor Coil Indoor Coil and Condensate Drain Pan 16 Outdoor Fam via e emt RD Electrical Controls and Wiring Refrigerant Circuit Indoor ceci detiene br iet c Metering Devices renes an ERRR Eu bricat
41. sure discharge line pressure by attaching a gauge to the service port 2 Measure the liquid line temperature by attaching a temperature sensing device to it 3 Insulate the temperature sensing device so that the outdoor ambient doesn t affect the reading 4 Refer to the required subcooling in Tables 4 and 5 to find the required subcooling based on the model size and the outdoor ambient temperature 5 Interpolate if the outdoor temperature lies in between the table values Extrapolate if the temperature lies beyond the table range 6 Find the pressure value corresponding to the measured pres sure on the compressor discharge line 7 Read across from the pressure reading to obtain the Liquid line temperature for a required subcooling 8 Add charge if the measured temperature is higher than the liquid line temperature value in the table 9 Add charge using the service connection on the suction line of the compressor HEATING MODE CHARGE Do not attempt to adjust charge by cooling methods while in heat pump heating mode Recover refrigerant and weigh in according to unit data plate refrigerant data Step 4 Indoor Airflow and Airflow Adjustments NOTE For cooling operation the recommended airflow is 350 to 450 cfm per each 12 000 Btuh of rated cooling capacity Table 7 shows dry coil air delivery for horizontal discharge units Tables 9 11 show pressure drops NOTE Be sure that all supply and return air grilles are open
42. t Field installed filter drier restricted Replace Compressor runs but outdoor fan does not Normally closed contacts on defrost board open 19 Check condition of relay on board Replace board if necessary START UP CHECKLIST REMOVE AND STORE IN JOB FILE PRELIMINARY INFORMATION Model sd Technician Customer Information Name Address iie He tt e qti rd is d Ede e nit dented tts Hr e d Il PRE START UP ____ Verify that all packing materials have been removed from unit ____ Verify that condensate connection is installed per installation instructions ____ Check all electrical connections and terminals for tightness 2 Check wire proximity to refrigerant tubes and sheet metal edges _____ Check that indoor indoor air filter is clean and in place ____ Verify that unit installation is level _____ Check fan wheel propeller for location in housing and setscrew tightness Ill START UP Supply Voltage L1 L2 L2 L3 L3 L1 Compressor Amps L1 C L2 S L3 R Indoor Fan Amps Outdoor Fan Amps TEMPERATURE Cooling Mode Outdoor Air Temperature DB WB Return Air Temperature DB WB Cooling Supply Air DB WB PRESSURES Cooling Mode Refrigerant Suction psig Suction Line Temp Refrigerant Discharge psig Discharge Tempt TEMPERATURE Heating Mode Outdoor Air
43. t Service Techniques Use standard evacuating techniques After evacuating system weigh in the specified amount of refrigerant refer to Table 2 UNIT GROUND _ S TO DISCONNECT PER NEC eee acrid YEL PER NEC _ E Pm C00012 Fig 9 Line Power Connections BROWN 20 GREEN YELLOW DD ORANGE WHITE Hj VIOLET GG CO C2 C2 C2 2 Thermostat Unit Control and subbase Power A05207 Fig 10A Control Connections Sizes 024 042 BROWN s GREEN me YELLOW PINK we WHITE VIOLET W3 MR Thermostat Unit Control and subbase Power A05208 Fig 10B Control Connections Sizes 048 060 LOW CHARGE COOLING 024 042 units 1 Measure suction line pressure by attaching a gauge to the service port 2 Measure the suction line temperature by attaching a tempera ture sensing device to it 3 Insulate the temperature sensing device so that the outdoor ambient doesn t affect the reading 4 Locate the measured suction line pressure in the top row of Table 8 and the measured outdoor ambient temperature in the left column of the table Based on the two values determine the required suction line temperature 5 If the measured suction line temperature is greater than the tabulated temperature add charge in the system 048 and 060 units 1 Mea
44. t metal edges Move and secure wires to isolate from tubing and sheet metal edges Fig 13 Outdoor Fan Adjustment 060 Size After inspecting the electrical controls and wiring replace all the panels Start the unit and observe at least one complete cooling cycle to ensure proper operation If discrepancies are observed in operating cycle or if a suspected malfunction has occurred check each electrical component with the proper electrical instrumenta tion Refer to the unit wiring label when making these checkouts NOTE Refer to the Sequence of Operation section as an aid in determining proper control operation Step 7 Refrigerant Circuit Inspect all refrigerant tubing connections and the unit base for oil accumulations annually Detecting oil generally indicates a refrig erant leak If oil is detected or if low cooling performance is suspected leak test all refrigerant tubing using an electronic leak detector or liquid soap solution If a refrigerant leak is detected refer to Check for Refrigerant Leaks section See Table of Contents for page number If no refrigerant leaks are found and low cooling performance is suspected refer to Refrigerant Charge See Table of Contents for page number Step 8 Indoor Airflow The cooling airflow does not require checking unless improper performance is suspected a problem exists be sure that all supply and return air grilles are open and free from obstructions 1
45. the unit top be sure to perform all of the routine maintenance procedures that require top removal including coil inspection and cleaning and condensate drain pan inspection and cleaning 15 d Slide the blower housing from the rails of the duct panel and place it outside the unit Remove the blower wheel from the housing a Loosen the set screw which secures the wheel to the motor shaft b Loosen the three mounting legs of the motor by removing the bolts that fasten themounting legs to the housing c Slide out the motor assembly motor belly band and the 3 mounting legs from the hub of the wheel d Remove the filler panel at the discharge end of the blower housing by removing the two screws that fasten it to the housing e Remove the wheel form the housing Remove the caked on dirt from the wheel and the motor using a brush Remove lint and dirt accumulations from the wheel and housing with a vacuum cleaner using a soft brush attachment 5 Remove grease and oil with a mild solvent Reassemble Table 9 Wet Coil Pressure Drop UNIT SIZE STANDARD CFM S C F M 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 024 027 034 040 047 053
46. trap using a 3 4 in OD tubing or pipe See Fig 5 and 6 Make sure that the outlet of the trap is at least 1 in lower than the unit drain pan condensate connection to prevent the pan from overflowing Prime the trap with water Connect a drain tube using a minimum of 3 4 in PVC 3 4 in CPVC or 3 4 in copper pipe all field supplied Do not undersize the tube Pitch the drain tube downward at a slope of at least 1 in for every 10 ft of horizontal run Be sure to check the drain tube for leaks Prime trap at the beginning of the cooling season start up Allowable glues for condensate trap connection are Standard ABS CPVC or PVC cement Table 2 Physical Data UNIT 50ZHA 024 030 036 042 048 060 OPERATING WEIGHT Ibs 293 324 377 389 384 433 COMPRESSOR TYPE Scroll Ultra Tech Scroll R 22 REFRIGERANT Ch Ib Cnarge 7 5 10 3 10 3 11 9 11 4 13 3 REFRIGERANT METERING DEVICE Accurater TXV Orifice ID in 067 067 082 086 Orifice OD in 049 057 059 063 070 073 CONDENSER COIL Copper Tubes Aluminum Plate Fins Rows Fins in 2 21 2 21 2 21 2 21 2 21 2 21 Face Area sq ft 11 1 12 7 15 8 15 8 13 3 15 8 CONDENSER FAN Propeller Nominal Cfm 2600 2600 3200 3200 3200 3300 Diameter in 20 20 20 20 20 20 Motor HP RPM 1 8 825 1 8 825 1 4 1100 1 4 1100 1 4 1100 1 2 1100 EVAPORATOR COIL Copper Tubes Aluminum Plate Fins Face Area sq
47. trols indoor fan operation When the FAN switch is placed in the ON position the IFR indoor fan relay is energized through the G terminal on the thermostat The normally open contacts close which then provide power to the indoor evaporator fan motor IFM The IFM will run continuously when the FAN switch is set to ON When the FAN switch is set to AUTO the thermostat deenergizes the IFR provided there is not a call for cooling The contacts open and the IFM is deenergized The IFM will be energized only when there is a call for cooling in heat pump heating mode or if the unit is equipped with accessory electric heat the indoor fan motor will also run while the accessory electric heat is energized NOTE Some units are equipped with a time delay relay On these units the indoor fan remains on for 30 seconds after G or Y is deenergized Table 8 Cooling Charging Chart SUCTION LINE TEMPERATURE F Suction Line Pressure PSIG OD Temp F 52 54 56 59 61 64 67 70 73 76 79 82 85 89 92 45 51 55 60 64 69 55 53 57 62 66 70 65 53 57 62 66 71 75 75 56 61 66 71 76 85 53 58 63 67 72 95 50 54 58 62 66 105 50 53 57 60 64 115 49 52 55 58 61 125 50 53 56 59 SUCTION LINE TEMPERATURE C Suction
48. unit ground in the control compartment or conduit approved for electrical ground when installed in accordance with NEC National Electrical Code ANSI American National Standards Institute NFPA latest edition in Canada Canadian Elec trical Code CSA C22 1 and local electrical codes 2 Use only copper conductor for connections between field supplied electrical disconnect switch and unit DO NOT USE ALUMINUM WIRE 3 Be sure that high voltage power to unit is within operating voltage range indicated on unit rating plate 4 Insulate low voltage wires for highest voltage contained within conduit when low voltage control wires are run in same conduit as high voltage wires 5 Do not damage internal components when drilling through any panel to mount electrical hardware conduit etc Consult local power company for correction of improper voltage 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 for maximum fuse circuit breaker size and minimum circuit amps ampacity for wire sizing See Table 6 for electrical data The field supplied disconnect may be mounted on the unit over the high voltage inlet hole See Fig 2 INDOOR D THERMOSTAT FROM POWER p SOURCE POWER AND
49. uts down within 60 seconds for 024 042 or 90 seconds for 048 and 060 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 outdoor fan and indoor blower motors start and that reversing valve shifts Observe that cooling cycle shuts down when control setting is satisfied Reversing valve RV remains energized 3 Place system switch in HEAT position Observe that compres sor indoor fan and outdoor fan energize Reversing Valve is deenergized in heat pump heating mode Set control above room temperature Observe that heating cycle shuts down when control setting is satisfied 4 When using an automatic changeover room thermostat place both SYSTEM and FAN switches in AUTO positions Observe that unit operates in Cooling mode when temperature control is set to call for cooling below room temperature and unit operates in Heating mode when temperature control is set to call for heating above room temperature Step 3 Refrigerant Charge Refrigerant Charge Amount of refrigerant charge is listed on unit nameplate and in Table 2 Refer to Carrier Refrigerant Service Techniques Manual Refrigerants section Unit panels must be in place when unit is operating during charging procedure Unit must operate a minimum of 15 minutes before checking charge NO CHARGE Refer to Carrier Refrigeran
Download Pdf Manuals
Related Search