WarmAir
Model 135 Manual REPAIR PROCEDURES
Page 32 of 43
Important: Static
sensitive components!
Use proper electro-
static discharge
protection when
replacing the control
board.
Replacing the Blower Motor or Heater
NOTE: Due to the technical complexity associated with replacing the blower motor or the heater, the
unit must be returned to the manufacturer or manufacturer’s authorized service centers for service.
Replacing the Control Board
1. Request CSZ repair part.
2. Unplug the unit.
3. Remove top cover and unplug all associated wire harness headers.
4. Remove the ground screw and associated wires.
5. Remove the two nylon nuts at the top of the board.
6. Remove the board by pulling the top upward and then slide the
control board downward to disengage the keyhole PCB mounts. Do
not bend the board.
7. Remove the board from the exterior top cover.
8. Place the board in a static-protective bag and container, and return it
to CSZ.
9. Using proper electrostatic procedures, reinstall the board by
reversing the above steps.
Replacing the Power Cord
1. Request CSZ repair part.
2. Unplug the unit.
3. Remove exterior top cover and outer wrap from unit.
4. Remove the strain relief from the rear of the back plate using the manufacturer’s recommended
tool.
5. Remove the 3/8” nylon clamp, the ground wire, and the terminal block from the back plate.
Loosen the screws that secure the power cord to the terminal block.
6. Remove the power cord from the assembly.
7. Insert the new power cord through the back plate and secure the power cord wires to the
appropriate terminal block (brown – L1 and blue – N) locations.
8. Check the quality of each connection by measuring the resistance from the plug to each of the
lines. Resistance should be approximately zero.
9. Complete installation by reversing the above steps.
10. Perform all leakage current and grounding integrity tests.
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