5-7. HEAT EXCHANGER
This task covers:
Tool Kit, Service Refrigeration Unit
Heat exchanger removed from heater and
Overheat switch and flame switch removed
Dry cleaning solvent
(Item 6, Appendix
General Safety Instructions
Clean parts in a well-ventilated area. Avoid inha-
lation of solvent fumes and prolonged exposure of
skin to cleaning solvent. Wash exposed skin
thoroughly. Dry cleaning solvent is potentially
dangerous to personnel. Do not use near open
flame or excessive heat. Flash point is 140
1. Remove two screws (1) securing top subassembly (2) to bracket (3).
2. Remove four screws (4) securing exhaust cover (5) to bracket (3) and remove cover (5).
3. Remove heat exchanger (6) from bracket (3).
Clean the heat exchanger using dry cleaning solvent (Item 6, Appendix E) and a wire brush (Item 3, Appendix E) to
remove deposits. Allow to dry.
Inspect the heat exchanger and exhaust pipe for cracks, breaks, holes, corrosion, and other damage. Replace a
defective heat exchanger.