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16

Inspect air filter(s) at least once each month and replace
(throwaway--type) or clean (cleanable--type) at least twice during

each cooling season and twice during the heating season if electric
heat is installed, or whenever the filter becomes clogged with dust

and lint.

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.

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.
Disconnect electrical power, and install lockout tag to the

unit before removing top.

!

WARNING

Only qualified service personnel should perform maintenance and

service procedures that require unit top removal.
Refer to the following top removal procedures:

1. Unplug all three wires from the outdoor fan motor.
2. Remove 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

: All motors are pre--lubricated. Do not attempt to lubricate

these motors.
For longer life, operating economy, and continuing efficiency,

clean accumulated dirt and grease from the blower wheel and
motor annually.

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.
Disconnect electrical power, and install lockout tag to the

unit before cleaning and lubricating the blower motor and

wheel.

!

WARNING

To clean the blower wheel:

1. Remove the blower housing:

a. Remove the screws on the external side of the duct

panel that fasten the housing to the duct panel assembly.

b. Remove the side access panel and unscrew the

mounting bracket that fastens the blower housing to the
internal partition panel of the control box assembly.

c. Make sure that the blower housing is supported by hand

before completely removing the mounting bracket.

d. Slide the blower housing from the rails of the duct panel

and place it outside the unit.

2. 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 the mounting 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. Ensure proper reassembly by marking wheel orientation.

Remove the wheel from the housing.

3. Remove the caked on dirt from the wheel and the motor

using a brush.

4. 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.
6. Reassemble

a. Slip the wheel back in the housing with the hub set

screw parented in the correct direction.

b. Install the filler panel.

c. Reinsert the motor assembly in the wheel hub and align

the mounting legs with the housing mounting hold

locations.

d. Tighten the mounting bolts to fasten the motor assembly

with the housing.

e. Center the wheel in the housing by sliding it, align the

flat end of the shaft with the set screw and tighten the

set screw.

f. Slide back the blower housing into the mounting rails in

the duct panel and install the mounting bracket back in
its position.

g. Install the screws on the external side of the duct panel

to fasten duct panel with the housing.

h. Replace the side access panel.

PA

3Z

B

Summary of Contents for PA3Z-B

Page 1: ...round Lead to Unit Ground 8 Routing Control Power Wires 8 Accessory Electric Heat Wiring 8 PRE START UP 8 START UP 9 15 Check for Refrigerant Leaks 9 Start Up Cooling and Make Adjustments 9 Checking Cooling and Heating Control Operation 9 Refrigerant Charge 11 No Charge 11 Low Charge Cooling 11 Indoor Airflow and Airflow Adjustments 11 Sequence of Operation 11 Fan Operation 11 Cooling Operation 11...

Page 2: ...plications with a field supplied plenum RECEIVING AND INSTALLATION Step 1 Check Equipment IDENTIFY UNIT The unit model number and serial number are printed on the unit informative plate Check this information against shipping papers INSPECT SHIPMENT Inspect for shipping damage while unit is still on shipping pallet If unit appears to be damaged or is torn loose from its anchorage have it examined ...

Page 3: ...eater element 3 Size ductwork for cooling air quantity cfm The minimum air quantity for proper electric heater operation is listed in Table 2 Heater limit switches may trip at air quantities below those recommended 4 Seal insulate and weatherproof all external ductwork Seal insulate and cover with a vapor barrier all ductwork passing through conditioned spaces Follow latest Sheet Metal and Air Con...

Page 4: ...DE OF UNIT WITH DUCT OPENINGS 0 0 REQUIRED CLEARNACE FOR SERVICING TOP OF UNIT 36 0 914 SIDE OF UNIT OPPOSITE DUCT OPENINGS 30 0 762 SIDE OF UNIT WITH POWER ENTRY 30 0 762 EXCEPT FOR NEC REQUIREMENTS NOTE CLEARANCES MUST BE MAINTAINED TO PREVENT RECIRCULATION OF AIR FROM OUTDOOR FAN DISCHARGE A REMOVABLE FENCE OR BARRICADE REQUIRES NO CLEARANCE DIMENSIONS IN ARE IN MM A10295 Fig 4 Unit Base Dimens...

Page 5: ... UNIT WITH DUCT OPENINGS 0 0 REQUIRED CLEARANCE FOR SERVICING INCHES MM TOP OF UNIT 36 0 914 SIDE OF UNIT OPPOSITE DUCT OPENINGS 30 0 762 SIDE OF UNIT WITH POWER ENTRY 30 0 762 EXCEPT FOR NEC REQUIREMENTS NOTE CLEARANCES MUST BE MAINTAINED TO PREVENT RECIRCULATION OF AIR FROM OUTDOOR FAN DISCHARGE A REMOVABLE FENCE OR BARRICADE REQUIRES NO CLEARANCE DIMENSIONS IN ARE IN MM A10296 Fig 5 Unit Base D...

Page 6: ...050 2700 20 508 1 4 1050 2700 20 508 1 4 1050 3000 20 508 1 3 1100 INDOOR COIL ROWS FINS in FACE AREA sq ft 2 12 4 3 3 12 4 3 3 12 4 3 3 12 4 9 3 12 4 9 3 12 6 1 INDOOR BLOWER NOMINAL COOLING AIRFLOW cfm SIZE L x D in mm MOTOR HP 800 8 x 11 203 x 279 1 3 1000 8 x 11 203 x 279 1 3 1200 9 5 x 12 241 x 305 1 2 1400 9 5 x 12 241 x 305 1 2 1600 9 5 x 12 241 x 305 3 4 1750 10 5 x 12 267 x 305 1 HIGH PRE...

Page 7: ...y of personal injury if an electrical fault should occur This ground may consist of an electrical wire connected to the unit ground screw in the control compartment or conduit approved for electrical ground when installed in accordance with NEC ANSI NFPA 70 American National Standards Institute National Fire Protection Association latest edition in Canada Canadian Electrical Code CSA C22 1 and loc...

Page 8: ...oad resistor wired across low voltage leads G and C Purpose of resistor is to provide a small electrical load for the indoor thermostat fan circuit to ensure reliable operation ACCESSORY ELECTRIC HEAT WIRING Refer to accessory electric heat installation instructions for information on installing accessory electric heat Accessory electric heat wiring is shown in Fig 14 PRE START UP FIRE EXPLOSION E...

Page 9: ... practices NOTE Install a filter drier whenever the system has been opened for repair 3 Add a small charge of R 410A refrigerant vapor to system and leak test unit 4 Recover refrigerant from system and evacuate to 500 microns if no additional leaks are found 5 Charge unit with R 410A refrigerant using an accurate scale Refer to unit rating plate for required charge Step 2 Start Up Cooling and Make...

Page 10: ...10 Table 3 Superheat Charging A10038 Table 4 Required Subcooling A10039 PA3ZB ...

Page 11: ...efer to the required subcooling in Table 4 to find the required subcooling based on the model type and the outdoor ambient temperature 5 Interpolate if the outdoor temperature lies in between the table values 6 Find the pressure value corresponding to the measured pressure on the compressor discharge line 7 Read across from the pressure reading to obtain the Liquid line temperature for a required ...

Page 12: ...12 ACCESSORY ELECTRIC HEAT 24 VOLT THERMOSTAT CONNECTIONS 24 VOLT THERMOSTAT CONNECTIONS THERMOSTAT WIRES A10024C Fig 13 Typical Single Phase Connection Electrical Diagram PA3ZB ...

Page 13: ...13 24 VOLT THERMOSTAT CONNECTIONS A10024L Fig 13 Cont Typical Single Phase Ladder Electrical Diagram PA3ZB ...

Page 14: ...14 A10025 Fig 14 Single Phase Accessory Electric Heater Wiring PA3ZB ...

Page 15: ...ired When the need for heating is satisfied the heater and IFM are de energized MAINTENANCE To ensure continuing high performance and to minimize the possibility of premature equipment failure periodic maintenance must be performed on this equipment This cooling unit should be inspected at least once each year by a qualified service person To troubleshoot unit refer to Table 9 Troubleshooting Char...

Page 16: ... 1 Remove the blower housing a Remove the screws on the external side of the duct panel that fasten the housing to the duct panel assembly b Remove the side access panel and unscrew the mounting bracket that fastens the blower housing to the internal partition panel of the control box assembly c Make sure that the blower housing is supported by hand before completely removing the mounting bracket ...

Page 17: ...lash water on the insulation motor wiring or air filter s If the drain trough is restricted clear it with a plumbers snake or similar probe device Outdoor Fan Adjustment UNIT OPERATION HAZARD Failure to follow this caution may result in damage to unit components Keep the condenser fan free from all obstructions to ensure proper cooling operation Never place articles on top of unit CAUTION 1 Shut o...

Page 18: ...xtreme caution when working near compressors Power should be shut off if possible for most troubleshooting techniques Refrigerants present additional safety hazards EXPLOSION HAZARD Failure to follow this warning could result in personal injury or death and or property damage Wear safety glasses and gloves when handling refrigerants Keep torches and other ignition sources away from refrigerants an...

Page 19: ...ry cloth shop towel inside unit immediately under component s to be serviced and prevent lubricant run offs through the louvered openings in the unit base 4 Perform required service 5 Remove and dispose of any oil contaminated material per local codes Liquid Line Filter Drier The filter drier is specifically designed to operate with R 410A Use only factory authorized components Filter drier must b...

Page 20: ...imum 700 psig service pressure rating S Leak detectors should be designed to detect HFC refrigerant S R 410A as with other HFCs is only compatible with POE PVE oils S Vacuum pumps will not remove moisture from oil S Only use factory specified liquid line filter driers with rated working pressures no less than 600 psig S Do not install a suction line filter drier in liquid line S POE PVE oils absor...

Page 21: ...use and replace Faulty outdoor fan motor or capacitor Replace Restriction in refrigerant system Locate restriction and remove Compressor operates continuously Dirty air filter Replace filter Unit undersized for load Decrease load or increase unit size Thermostat temperature set too low Reset thermostat setting Low refrigerant charge Locate leak repair and recharge Air in system Recover refrigerant...

Page 22: ...N IN HOUSING ORIFICE AND SETSCREW TIGHTNESS III START UP ELECTRICAL SUPPLY VOLTAGE COMPRESSOR AMPS INDOOR EVAPORATOR FAN AMPS TEMPERATURES OUTDOOR CONDENSER AIR TEMPERATURE DB RETURN AIR TEMPERATURE DB WB COOLING SUPPLY AIR DB WB PRESSURES REFRIGERANT SUCTION PSIG SUCTION LINE TEMP REFRIGERANT DISCHARGE PSIG LIQUID TEMP VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS Measured at suction inlet to c...

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