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Fig. 31—Typical Heat Pump Operation-Cooling Mode

C95044

STRAINER

ACCUMULA

COMPRESSOR

STRAINER

LCS

OUTDOOR COIL

INDOOR COIL

Check Valves

Closed

Open

Closed

Open

LEGEND

LCS

Loss of Charge Switch

Acutrol

Metering Device

Check Valve (Arrow indicates direction 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.

Содержание 50HX Guide

Страница 1: ... WIRING 30 REFRIGERANT CIRCUIT 30 INDOOR AIRFLOW 31 METERING DEVICE ACUTROL DEVICE 31 LIQUID LINE STRAINER 31 Troubleshooting 34 Start Up Checklist 36 NOTE TO INSTALLER Before the 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 condi...

Страница 2: ...tall a 6 in gravel apron in front of outdoor coil air inlet to prevent obstruction of airflow by grass or shrubs Do not secure the unit to the slab except when required by local codes Step 3 Provide Clearances The required minimum service clearances are shown in Fig 2 5 Adequate ventilation and outdoor air must be provided The outdoor fan pushes air through the outdoor coil and discharges it throu...

Страница 3: ...it Unit must remain in an upright position during all rigging and moving operations The unit must be level for proper condensate drainage the ground level pad or accessory roof curb 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 UNITS WITHOUT BASE RAILS Accessory rigging brackets are re...

Страница 4: ...ntil they make contact with the paint protectors 3 Secure device or hook of sufficient strength to hole in bracket as shown in detail C of Fig 7 4 If wood top is available use it for a spreader bar to prevent straps from damaging unit If wood top is not available use spreader bars of sufficient length UNITS WITH OPTIONAL BASE RAILS Keep unit upright and do not drop Use spreader bars or top crate w...

Страница 5: ...ig 7 5 Attach safety straps directly to the field supplied rigging straps or clevis clip Do not attach the safety straps to the lifting brackets 6 Use the top of the unit as a spreader bar to prevent the rigging straps from damaging the unit If the wood top is not available Fig 4 50HX036 060 Unit Dimensions without base rails UNIT ELECTRICAL CHARACTERISTICS UNIT WEIGHT CORNER WT LB KG CENTER OF GR...

Страница 6: ...at 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 trap using a 3 4 in NPT connection See Fig 18 Make sure that the outlet of the trap is at ...

Страница 7: ...ation 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 ...

Страница 8: ...vert a horizontal unit for downflow vertical discharge perform the following steps Fig 7 50HX Rigging Instructions UNIT SIZE CHART A CHART B Max Weight A B Max Weight C D LB KG IN MM IN MM LB KG IN MM IN MM 024 296 134 16 1 410 32 2 817 309 140 16 0 406 28 9 733 030 327 148 16 2 411 32 2 817 340 154 16 0 407 28 9 733 036 355 161 15 4 390 38 2 969 368 167 15 2 385 34 9 885 042 355 161 15 4 390 38 2...

Страница 9: ...sing a straight edge and sharp knife cut the insulation around the perimeter of the cover Remove the screws securing the cover to the unit base and slide out the cover Discard the cover Install filler bracket removed in Step 7 10 If unit ductwork is to be attached to vertical opening flanges on the unit base jackstand applications only do so at this time 11 It is recommended that the unit base ins...

Страница 10: ...ns on the system turn off main power to unit and install lockout tag or electrical shock could result 1 Open all electrical disconnects and install lockout tag before starting any service work 2 Remove indoor coil access panel See Fig 12 3 Locate lances in unit base insulation that are placed over the perimeter of the vertical duct opening cover See Fig 13 4 Using a straight edge and sharp knife c...

Страница 11: ... when the blower housing is installed in the vertical discharge position 12 Remove screws securing the high voltage raceway to duct panel Temporarily place raceway on top of unit until blower housing is installed 13 Orient blower housing for vertical airflow blower motor adjacent to horizontal duct opening and slide into vertical opening making sure the flanges on the blower side plates engage the...

Страница 12: ... electrical ground when installed in accordance with NEC National Electrical Code ANSI NFPA latest edition and local elec trical codes In Canada follow Canadian Electrical Code CSA Canadian Standards Association C22 1 and local electrical codes Failure to adhere to this warning could result in personal injury or death Fig 15 Converting Blower Assembly to Vertical Airflow C950010 PLUG ASSEMBLIES RA...

Страница 13: ...ns in Face Area sq ft 2 17 7 0 2 17 7 0 2 17 8 7 2 17 8 7 2 17 8 7 2 17 8 7 OUTDOOR FAN Nominal Cfm Diameter in Motor Hp Rpm 2200 20 1 4 1100 2200 20 1 4 1100 2200 20 1 4 1100 2400 20 1 4 1100 2400 20 1 3 1100 2400 20 1 3 1050 INDOOR COIL Rows Fins in Face Area sq ft 3 15 3 6 3 15 3 6 4 15 4 5 4 15 4 5 4 15 4 5 4 15 4 5 INDOOR BLOWER Motor Type Speeds Nominal Airflow Cfm Size in Motor Hp RPM PSC 3...

Страница 14: ... duct panel must be watertight Run the high voltage leads through the knockout on the duct panel see Fig 21 for location and size When the leads are inside the unit run leads up the high voltage raceway to the line wiring splice box Fig 22 For single phase units connect leads to the black and yellow wires see Fig 24 26 27 2 CONNECTING GROUND LEAD TO WIRE BINDING SCREW Refer to Fig 22 Connect the g...

Страница 15: ... the orange lead 6 Wrap the wire nut with electrical tape so that the metal terminal cannot be seen NOTE Indoor blower motor speeds may need to be changed for 208 v operation Refer to Indoor Airflow and Airflow Adjustment Section Fig 20 Field Fabricated Duct Cover C95019 14 11 16 372 13 3 4 348 3 3 4 94 0 0 105 8 270 9 32 7 TYP 19 482 22 GAGE SHEET METAL COVER SEE ABOVE 4 ADHESIVE BACKED SPONGE RU...

Страница 16: ...UT 2 DIA 2 DIA 7 8 DIA CONTROL POWER ENTRY Knockout on rectangular duct panel units entry hole on round duct panel units NOTE For rectangular duct knockout sizes see Fig 2 9 Fig 22 Wiring Splice Boxes C95022 UNIT LINE WIRE SPLICE BOX UNIT POWER LEAD WIRE BINDING SCREW CONTROL POWER SPLICE BOX 16 ...

Страница 17: ...48 3 51 7 56 6 61 8 67 9 74 8 90 4 100 3 60 60 60 70 80 80 100 110 22 5 26 0 33 7 39 1 45 1 50 1 67 9 78 1 25 30 35 40 50 60 70 80 23 8 35 35 042 208 230 1 187 253 20 0 104 0 1 4 3 1 3 75 5 00 5 60 7 50 7 50 10 0 11 30 15 0 15 0 20 0 18 1 20 8 27 1 31 3 36 1 41 7 54 1 62 0 72 2 83 3 52 1 55 5 63 3 68 6 74 6 81 6 97 1 107 0 119 8 133 7 60 60 70 80 80 90 100 110 125 150 22 5 26 0 33 7 39 1 45 1 50 8...

Страница 18: ...ase imbalance in supply volt age is greater than 2 Use the following formula to determine the percentage of voltage imbalance Voltage imbalance max voltage deviation from average voltage 100 x average voltage EXAMPLE Supply voltage is 460 3 60 AB 452 v BC 464 v AC 455 v 452 464 455 Average Voltage 3 1371 3 457 Determine maximum deviation from average voltage AB 457 BC 464 AC 457 Maximum deviation ...

Страница 19: ...ctory wiring connections Be sure that connections are completed and tight d Ensure electrical wiring does not contact refrigerant tubes or sharp 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 outdoor fan blade is correctly positioned in fan orifice Leading edge of outdoor fan blade...

Страница 20: ... HEAT mode and temperature control is set above room temperature that heaters and indoor blower come on Observe that heaters shut off when control setting is satisfied and that the indoor blower shuts off after fan time delay expires CHECKING AND ADJUSTING REFRIGERANT CHARGE The refrigerant system is fully charged with R 22 refrigerant tested and factory sealed NOTE Adjustment of the refrigerant c...

Страница 21: ...Fig 26 Wiring Diagram 024 to 042 208 230 60 1 C95037 21 ...

Страница 22: ...Fig 27 Wiring Diagram 048 to 060 208 230 60 1 with ECM Indoor C95038 22 ...

Страница 23: ...C HP SIZE BLU The preset factory default selection for AC HP SIZE air conditioner heat pump is set to 400 cfm ton The selection pins are configured for 350 cfm ton and 400 cfm ton 3 TYPE ORN The TYPE is a preset factory default selection The preset factory default setting is AC for the 50HX units Default setting should not be altered 4 AC HP CFM ADJUST BLK The preset factory default selection is M...

Страница 24: ...o the compressor contactor C and IFM simultaneously through the Y and G terminals of the thermostat Energizing the contactor closes the normally open set of contacts supplying power to both the compressor and outdoor condenser fan motor OFM On the loss of the call for cooling 24 v is removed from the Y and G Table 5 Terminal Configuration TERMINAL 1 2 3 4 Available Airflow CFM 1365 1470 1680 1840 ...

Страница 25: ...contactor is energized and defrost thermostat DFT is closed Defrost mode is identical to Cooling mode except outdoor fan motor stops and a bank of optional electric heat turns on to warm air supplying the conditioned space Auxiliary Heating If accessory electric heaters are installed on a call for heat circuits R W and R G are made through the thermostat contacts energizing the heater relay and IF...

Страница 26: ...it Remove screws securing blower 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 hous ing and slide motor and motor mount out of housing Table 8 Dry Coil A...

Страница 27: ...anel 4 Restore electrical power to unit Start unit and check for proper blower rotation and motor speeds during heating and cooling cycles OUTDOOR COIL INDOOR COIL AND CONDENSATE DRAIN PAN Inspect the outdoor coil indoor coil and condensate drain pan at least once each year See Unit Top Removal section The coils are easily cleaned when dry therefore inspect and clean the coils either before or aft...

Страница 28: ...Charging Table Unit 024 321 TEMP F AIR ENT COND EVAP AIR CFM 750 EVAP AIR Ewb F 56 58 60 62 64 66 68 70 72 74 76 65 SPH 38 0 37 3 37 4 37 5 38 3 37 7 36 8 35 9 35 0 34 3 33 5 70 33 3 32 3 33 2 33 9 36 9 36 0 35 2 34 4 33 4 32 5 31 8 75 24 6 25 6 24 1 25 0 33 3 34 8 33 8 32 6 31 8 31 0 30 2 80 16 4 17 6 21 4 16 8 23 2 31 8 32 2 31 3 30 4 29 5 28 6 85 9 4 8 6 14 7 21 6 29 4 29 8 28 9 27 8 27 0 90 11...

Страница 29: ...it 042 TEMP F AIR ENT COND EVAP AIR CFM 1400 EVAP AIR Ewb F 56 58 60 62 64 66 68 70 72 74 76 65 SPH 13 5 13 5 13 5 17 1 20 7 24 3 25 7 27 1 28 5 27 8 27 0 70 11 4 11 4 11 5 15 1 18 7 22 3 23 6 25 1 26 4 26 1 25 8 75 9 4 9 4 9 4 13 0 16 5 20 1 21 6 23 0 24 4 24 5 24 6 80 8 9 8 9 8 9 12 4 16 0 19 4 21 0 22 4 23 8 24 0 24 0 85 8 2 8 2 8 2 11 8 15 3 18 7 20 2 21 8 23 3 23 4 23 4 90 7 7 7 7 7 7 10 8 13...

Страница 30: ...f 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 refrig erant leak Table 13G Superheat Charging Table Unit 048 311 TEMP F AIR ENT COND EVAP AIR CFM 1550 EVAP AIR Ewb F 56 58 60 62 64 66 68 70 72 74 76 65 SPH 39 4 39 4 4...

Страница 31: ... outdoor coils LIQUID LINE STRAINER The liquid line strainer to protect metering device is made of wire mesh and located in the liquid line on the inlet side of the metering device TROUBLESHOOTING Use the Troubleshooting Cooling Heating guide see Table 13 if problems occur with these units START UP CHECKLIST Use the Start Up checklist to ensure proper start up procedures are followed Fig 30 Requir...

Страница 32: ...ected 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 c...

Страница 33: ...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 in 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...

Страница 34: ...ameplate 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 Defective thermostat Replace thermostat Faulty outdoor fan motor or capacitor Replace Damaged reversing valve Determine cause and correct Restriction in refr...

Страница 35: ...ea Reset thermostat Cool Outdoor ambient below 40 F Install low ambient kit Filter drier restricted Replace Compressor runs but outdoor fan does not NC normally closed contacts on defrost board open Check condition of relay on board Replace if necessary IFM does not run Blower wheel not secured to shaft Properly tighten blower wheel to shaft Insufficient voltage at motor Determine cause and correc...

Страница 36: ...____ R C __________ Compressor Amps C __________ S __________ R __________ Indoor Evaporator Fan Amps __________ TEMPERATURE 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 Discharge Temp _...

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