CSA RA 350 - Page 34

Form I-RA/D 350/500, Page 34
Outer
Cylinder
Inner
Cylinder
Maintenance
Procedures
Continued
Pre-Heater Box
Pre-Heater
Controls
2. Remove the Pre-Heater from the Pre-Heater Box
• Remove the corner panel from the end of the box. The pre-heater
controls are visible.
• Disconnect the fuel lines at the inlet and outlet connections.
NOTE: There will be oil in the lines.
• Disconnect wires to the temperature controls.
• Disconnect the heating element wires.
• Remove the screw that attaches the pre-heater front support to
the bottom of the box.
• Slide the cylindrical aluminium pre-heater out of the box.
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
controls. Do not immerse in cleaning uid.
• Clean the outer portion of the cylinder with degreaser.
Cleaning Exte-
rior Surfaces
of Combustion
Chamber, Heat
Exchanger and
Air Moving
Device
WARNING: Turn off
the electric power
before cleaning
heater.
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.
To gain access to the front side of the combustion chamber/heat ex-
changer, remove the discharge louvers.
To access the air moving device, disconnect the wiring in the fan/blower
junction box and the exible 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 careful 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 exible conduit and wiring.
Check operation.
Cleaning ensures maximum efciency and eliminates the possibility of
the heater cycling on the limit switch from lack of air ow.