(1) Clean all metallic parts with dry cleaning solvent (fed. spec. P-D-680), and dry thoroughly.
(2) Wipe the insulating shields with a dry cloth.
(3) Inspect the heat exchanger for cracks, corroded or burned areas, severe dents, and damaged threads.
Replace a damaged heat exchanger.
(4) Inspec t all other parts for cracks, distortion, damaged threads, and other defects. Replace damaged parts.
Do not install a heat exchanger which has cracks, broken welds, or holes. Such
defects will allow combustion gases containing carbon monoxide, a deadly poison,
to contaminate the circulating air.
c. Reassembly. Assemble in reverse order of disassembly.
Be careful not to damage the flame switch when
inserting the heat exchanger. Restore power and test the heater.
The tube extension of the flame switch must pass through the clamp on the top of