TM 9-2350-247-34
FINAL TEST — COOLANT HEATER — Continued
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3.
Place heater control switch in START position and start timing heater immediately.
4.
Note multimeter reading. Amperage draw must not exceed 12.8 amps (15.3 amps below 70
F (21
C)).
5.
Heater should ignite within 40 seconds from time heater control switch is turned on.
6.
The flame detector switch must transfer within 200 seconds. Transfer will be indicated by the pilot lamp and a drop in
amperage draw. Move heater control switch to RUN. Amperage draw must not exceed 1.5 amps (4 amps below 70
F
(21
C)). While burner is igniting and prior to flame switch transfer, check burner seal for signs of fuel leakage. If leakage
is present, replace packing gasket (WP 0070 00).
7.
If heater fails to ignite or is slow to set flame, clean igniter cavity and install a new igniter (see your -20).
8.
If flame detector switch does not transfer within the required time limits, the burner is bad. Replace heater if burner
is bad.
9.
Allow heater to burn one minute on HI heat, then move heater control HI-LO switch to LO. Burning and blower speed
should continue, but slow down. If heater goes out, replace fuel control valve (WP 0065 00) and heater end cover.
10. Turn heater control switch to OFF. Fuel flow and burning should stop in about 30 seconds. Blower should continue to
run from 1 to 3 minutes and then stop. If blower does not work within limits, adjust flame detector switch (see your -20).
If blower still fails to work within limits, replace flame detector switch (WP 0066 00).
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