Technical data

13773-001
78-20
Page 2 30 Nov 2000
(5) Inspection/Check - Exhaust Muffler/Heat Exchanger
The exhaust muffler/heat exchanger must be inspected for secure mounting, leakage, and gen-
eral condition at each 100 hour inspection. Inspect the heater muffler visually and the heat
exchanger by pressure check to determine possible leakage which could allow carbon monoxide
to enter the heating system.
(a) Acquire necessary tools, equipment, and supplies.
(b) Visually inspect exhaust muffler/heat exchanger welds, brackets, and joints for dents,
cracks, missing parts, soot, or evidence of exhaust gasses escaping through holes,
cracks, or around joints.
(c) Remove exhaust muffler/heat exchanger. (Refer to 78-20)
(d) Disassemble exhaust muffler/heat exchanger. (Refer to 78-20)
(e) Visually inspect heat exchanger welds and joints for dents, cracks, soot, or evidence of
exhaust gasses escaping through holes, cracks, or around joints.
(f) To ensure tight seal, wipe soot from inside of heat exchanger pipes with tack cloth.
(g) Install solid test plug on one end of heat exchanger.
(h) Install ported test plug on other end of heat exchanger.
(i) Attach pressure source and pressurize to 2.5 psi for 1 minute.
(j) Submerge pressurized heat exchanger in soap suds solution and inspect for leaks.
(k) Repair or replace heat exchanger if leaks are detected.
(l) Assemble exhaust muffler/heat exchanger. (Refer to 78-20)
(m) Install exhaust muffler/heat exchanger. (Refer to 78-20)
Description P/N or Spec. Supplier Purpose
Solid test plug - Any Source Plug heater muffler.
Ported test plug - Any Source Plug heater muffler.
Pressure source - Any Source Pressurize heater
muffler.
Submerging tank filled with
soap suds solution
- Any Source Detect heater muf-
fler.