TM 5-4520-256-14
(5)
Repeat for other two rods and adjust nuts and rods to center heat exchanger in heater unit opening.
(6)
Install perforated plate (8), hose (11), rod (10), nut (7), and nut (9) into intake tube of heat exchanger
(20).
(7)
Install other nut (2) on outside of heater unit.
(8)
Install sealing plate (3), four flat washers (4), four lockwashers (5), and four screws (6).
(9)
Install duct covers (para 4-4f).
(10)
Install combustion air hose (para 3-40d).
(11)
Install fuel burner nozzle (para 3-39d).
(12)
Install burner assembly (para 3-38d).
(13)
Install flame detector (para 3-37d).
(14)
Install sightglass (para 3-36d).
(15)
Install discharge temperature thermostat (para 3-31e).
(16)
Install high temperature safety thermostat (para 3-27e).
(17)
Install duct assembly (para 3-12e).
(18)
Install exhaust pipe (para 3-11d).
(19)
Install air filters and access door (para 3-10d).
d.
Carbon Monoxide Test. A carbon monoxide test must be conducted at 1000 hour operating intervals. Check
for the presence of carbon monoxide as follows:
CAUTION
Follow the testing procedures carefully to avoid getting a false reading.
(1)
Wrap a 24-inch length of 1/8-inch I. D. tubing with a soft shop towel for the full 24 inches. Wrap tightly
and secure in place with string.
(2)
Saturate the towel with cold water immediately before taking the sample. Do not allow water to enter
the tubing.
(3)
Purge tubing of fresh air by placing tubing in a heated air stream.
(4)
Attach one end of the tubing to a carbon monoxide tester (4, Section III of MAC) and the other end into
the ventilating air stream after the heater reaches a stabilized temperature of at least 1000F.
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