Maintenance
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.
The PTHE is equipped with a
Power Cord Removal
1.Disconnect power to the unit.
2.Remove the unit front cover.
3.Remove two screws of power cord connector front cover.
4.Remove the power cord strain relief.
5.Remove power cord from connector.
Reversing Valve
Occasionally the reversing valve may stick in the heating or cooling position or in the
When stuck in the
Check the operation of the valve by starting the system and switching the operation from COOLING to HEATING and then back to COOLING.
If no voltage is registered to the coil, check the operation of the reversing relay and the continuity of the connecting wires.
If voltage is registered at the coil, tap the valve body lightly while switching the system from HEATING to COOLING etc. If this fails to cause the valve to switch position, remove the coil connector cap and wiring and test the continuity of the valve coil. If the coil does not test continuous replace it.
If the valve is inoperative, replace.
Component Replacement
Replacement of the compressor, evaporator, condenser, capillary tubes and reversing valve must be in accordance with accepted service practices. These procedures include a complete evacuation of both high and low sides, and changing of the capillary tube assembly whenever the refrigerant system is opened.
Before replacing a component in the sealed system, make sure that the cause for complaint does not lie in the electrical circuit, control, overload or is due to some other reason. The serviceman must be familiar with the operational characteristics of the product and should not jump to conclusions.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.
Unit Disassembly Procedures
1.Disconnect power to the unit.
2.Remove the unit front cover.
3.Remove the three screws on each side of the chassis that secure the chassis to the wall sleeve.
4.Carefully slide the chassis out of the wall sleeve and place on floor or a protected cart.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.
Note: ALL phases of this installation must comply with
NATIONAL, STATE AND
LOCAL CODES. Improper wiring or installation may damage thermostat.
Power cord Installation
1.Install power cord to connector. Gently press the connector into position until top and bottom latches engage.
2.Reinstall the power cord strain relief.
3.Reinstall power cord connector front cover.
4.Reinstall the unit front cover.
Capacitor Removal
1.Remove the control box. Refer to the power cord disassembly for instructions on removing the control box.
2.Remove the screw securing the capacitor to the control box.
Heater Assembly Removal
1.Remove the strain relief.
2.Remove the three screws securing the discharge screen to the chassis.
3.Unplug the power cord connector and remove the power cord.
Removing the Indoor Coil and Indoor Air Thermistors
1.Remove the front cabinet.
2.Remove the control box cover.
3.Disconnect the indoor coil/air thermistor wiring from the control board.
4.Locate the indoor coil/air thermistor on the suction tube or evaporator. Gently pull the thermistor from the housing.
5.Remove the indoor coil/air thermistor from the unit.
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