Applies to:

Replacing the Thermostat

To avoid electrical shock or property damage, disconnect power before installing or servicing equipment. A qualified technician must perform the service procedures.

Disconnect the electrical supply to the cabinet.
Remove the access panel from the top of the module.
Remove the four screws from the control panel and pull it down.
Remove the wires from the thermostat. With the thermostat set at the maximum setting (all the way clockwise), the circuit should be closed. With the thermostat in the 0, or OFF, position (all the way counterclockwise), the circuit should be open. If the thermostat is found to be defective, replace it by continuing with the following instructions in this section.
Remove the four nuts that hold the blower box to the cabinet.
Lift the blower box up to expose the thermometer and thermostat bulbs.
While holding the blower box, remove the two nuts that secure the bulb retaining clamps and remove the thermostat bulb from the clamps.
Using a 5/64” Allen wrench, loosen the two set screws in the thermostat knob and remove the knob.
Remove the two nuts that hold the thermostat bracket to the control panel.
Remove the thermostat shaft extension with a 1/16” Allen wrench.
Remove the two screws that hold the thermostat to the bracket.
Remove the thermostat from the unit.
Install a new thermostat in reverse order.

Reposition the blower box and secure it with the four nuts previously removed.

NOTICE -

Be sure that both the thermometer and thermostat capillary tubes pass through the notches in the front corners of the blower box. Failure to do so could permanently damage the thermometer or thermostat and cause improper operation of the cabinet.

Reseal the notches in the blower box corners with silicone rubber sealant.
Push the control panel back in place and put in screws.
Replace the access panel to the module.
Reconnect the electrical supply to the cabinet.