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Carrier 50HX Guide, Installation, Start-Up, And Operating Instructions Manual, Page: 26 / 36

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Carrier 50HX Guide Installation, Start-Up, And Operating Instructions Manual Download Page 26

UNIT TOP REMOVAL

NOTE:

When performing maintenance or service procedures that

require removal of 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.

Only qualified service personnel should perform maintenance and
service procedures that require unit top removal. Refer to the
following top removal procedures:

1. Remove 7 screws on unit top cover surface. (Save all screws.)

2. Remove 4 screws on unit top cover flange. (Save all screws.)

3. Lift top from unit carefully. Set top on edge and make sure

that top is supported by unit side that is opposite duct (or
plenum) side.

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.

INDOOR BLOWER AND MOTOR

NOTE:

Motors without oilers are prelubricated. 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.

Lubricate the motor every 5 years if the motor is used intermit-
tently (thermostat FAN switch in AUTO. position), or every 2
years if the motor is used continuously (thermostat FAN switch in
ON position).

Disconnect and tag electrical power to the unit before
cleaning the blower motor and wheel. Failure to adhere to this
warning could cause personal injury or death.

To clean the blower motor and wheel:

1. Remove and disassemble blower assembly as follows:

a. Remove unit access panel.

b. For PSC Blower Motors Disconnect motor lead from

indoor fan relay (IFR). Disconnect yellow lead from
terminal L2 of the contactor.

c. On all units remove blower assembly from unit. 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 Air Delivery (Deduct 10 percent for 208v)*

Horizontal and Downflow Discharge

Unit 50HX024-042

230 AND 460 VOLT

Unit

Motor

Speed

External Static Pressure (in. wg)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

024 & 030

Low

Watts

280

275

265

255

250

245

240

—

—

—

—

Cfm

820

810

755

700

660

600

560

—

—

—

—

Med

Watts

365

360

350

345

340

330

320

310

300

—

—

Cfm

1025

1010

975

940

900

850

800

720

630

—

—

High

Watts

—

—

490

480

470

460

445

430

410

390

380

Cfm

—

—

1300

1255

1200

1150

1080

1005

915

790

620

036

Low

Watts

520

495

474

458

445

425

—

—

—

—

—

Cfm

1375

1335

1290

1240

1200

1140

—

—

—

—

—

Med

Watts

575

560

535

510

480

460

440

425

—

—

—

Cfm

1520

1490

1450

1400

1380

1300

1200

1080

—

—

—

High

Watts

—

—

—

—

650

614

575

540

510

480

—

Cfm

—

—

—

—

1560

1500

1380

1280

1170

1060

—

042

Low

Watts

490

480

470

460

450

430

410

390

—

—

—

Cfm

1400

1380

1340

1300

1250

1200

1140

1070

—

—

—

Med

Watts

590

580

560

545

525

505

480

450

420

—

—

Cfm

1600

1560

1540

1470

1430

1360

1300

1220

1120

—

—

High

Watts

—

—

—

—

—

700

670

640

600

560

500

Cfm

—

—

—

—

—

1780

1670

1600

1480

1340

1100

* 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
static pressure available for ducting.

NOTES:
1. Do not operate the unit at a cooling airflow that is less than 350 cfm for each 12,000 Btuh of rated cooling capacity. Indoor coil frosting may occur at airflows below

this point.

2. Dashes indicate portions of table that are beyond the blower motor capacity or are not recommended.

Table 9—048 & 060 ECM Airflow (CFM)

UNIT 50HX

FAN ONLY

(CFM)

COOLING

(CFM)

048

1400

1600

060

1750

2000

26

Summary of Contents for 50HX Guide

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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 ...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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 ...

Page 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...

Page 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 ...

Page 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...

Page 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...

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

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

Page 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...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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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