Service manual

SECTION 13: SERVICING
39 of 55
Combustion Air Intake
Pipe
Intake pipe and inlet must be intact. Look for obstructions, cracks on the pipe,
gaps in the sealed areas or corrosion.
The area must be free of dirt and dust.
Clean and reinstall as required.
See Page 22, Section 8.
Heat Exchanger Make sure there are no cracks.
Make sure there is no sagging, bending or distortion.
Clean or replace as required..
Gas Line and Shut-off
Valves
Check for gas leaks.
See Page 23, Section 9.
Burner Observation
Window
Make sure it is clean and free of cracks or holes.
Clean and replace as required.
Flue Blower Scroll, Wheel
and Motor
Compressed air or a vacuum cleaner may be used to clean dust and dirt.
Inshot Burners and
Orifices
Clear obstructions (even spider webs will cause problems).
Carefully remove any dust and debris from the burner.
Direct-Spark Igniter Replace if there are cracked ceramics, excessive carbon residue, or erosion
of the electrode.
The electrode gap should be 1/8" (3.2 mm).
Thermostat There should be no exposed wire or damage to the device or wiring.
See Page 25, Section 10.
Suspension Points Make sure the heater is hanging securely.
Look for signs of wear on the suspension materials or ceiling.
See Page 12, Figure 5.
Silicone Tubing Ensure tight, secure fit on all pressure fittings at pressure switch and vent box.
Gas Valve Verify that cap covering pressure regulator adjustment screw is secure and
has not been tampered with.
Verify all wiring connections.
Condensate Drain
(when installed)
Flush drain and clear any obstructions.
Wall Tag If wall tag is present, make sure it is legible and accurate. Please contact
Addison or ADDISON
®
independent distributor if you need a wall tag. See
Page 5, Section 2.1.