Form I-RA/D 140/235 (Version A), Mfg No. 110318 Rev 4, Page 33
Outer
Cylinder
Inner
Cylinder
Maintenance
Procedures
Continued
Cleaning Oil
Pre-Heater Sys
-
tem Continued
3. Clean the Pre-heater
• Place the pre-heater in a vice and carefully remove the outer
cylinder and the “O” ring. NOTE: There will be oil in the pre-
heater.
• Clean the inner section with a cloth and degreaser such as
carburetor cleaner. Be careful not to “clean” the electrical con-
trols. Do not immerse in cleaning fluid.
• Clean the outer portion of the cylinder with degreaser.
4. Reassemble the Pre-Heater and the heater.
• Check the “O” ring. If a new one is required, replace with P/N 132224.
• Reassemble the cylinder pieces with “O” ring in place.
• Slide the pre-heater in the box and attach the front support. Reconnect the wires and the
fuel lines and close the corner cover.
• Replace the burner assembly and reconnect the ignition controller.
Cleaning Exterior Surfaces of
Combustion Chamber, Heat
Exchanger and Air Moving Device
WARNING: Turn off the electric power before cleaning heater.
To gain access to the front side of the combustion chamber/heat exchanger, remove the discharge
louvers.
To access the rear side, remove the fan assembly or blower assembly.
To remove the air moving device, disconnect the wiring in the fan/blower junction box and the flexible
conduit.
• Use a stiff brush and a shop vacuum to clean the accumulated dust and dirt from the exterior
surface of the combustion chamber and the heat exchanger.
• Clean the air moving device (fan or blower). Use a brush and a shop vacuum, being care-
ful not to bend or damage either the fan blade or the blower wheel. Use a shop vacuum to
remove accumulated dirt from the motor.
• Replace the air moving device and the discharge louvers.
• Connect the flexible conduit and wiring.
Check operation.
Cleaning ensures maximum efficiency and eliminates the possibility of the heater cycling on the limit
switch from lack of air flow.
