TM 9-2350-277-34FINAL TEST – COOLANT HEATER — Continued 0077 004. Note ammeter reading. Amperage draw must not exceed 12.8 amps (15.3 amps below 70F (21C)).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 inamperage draw. Move the heater control switch to RUN. Amperage draw must not exceed 1.5 amps (4 amps below 70F(21C)).While burner is igniting and prior to flame switch transfer, check burner seal for signs of fuel leakage. If leakage ispresent, replace packing gasket (WP 0082 00).7. If the heater fails to ignite or is slow to set flame, clean the igniter cavity and install a new igniter (see your -20).8. If the flame detector switch does not transfer within the required time limits, the burner is bad. Replace heater if burneris bad.9. Allow the heater to burn one minute on HI heat, then move heater control HI-LO switch to LO. Burning and blower speedshould continue, but slow down. If the heater goes out, replace the fuel control valve and heater end cover (WP 0078 00).10. Turn the heater control switch to OFF. Fuel flow and burning should stop in about 30 seconds. Blower should continue torun from 1 to 3 minutes and then stop. If blower does not work within limits, readjust the flame detector switch (see your-20). If the blower still fails to work within limits, replace the flame detector switch (see your -20).TESTING RESTRICTION AND OVERHEAT THERMOSTATSNOTEThermostat shown in fuel control valve is set to open at 70F (21C) and to close at 30F (-1C).If temperature is below 70F (21C), the heating element in fuel control valve can be energizedduring any operational cycle.0077 00-6
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