TM 9-2350-261-34BURN TEST11. Secure coolant heater to test stand (1) andcoolant, fuel, electrical, and exhaustconnections. Do not start the heater unlessthere is an ample supply of coolant.12. Remove heater end cover (2) and checkinside for coolant leakage before startingburn test. Replace heater if coolant hasleaked.13. Place heater control switch in STARTposition and start timing heaterimmediately.14. Note multimeter reading. Amperage drawmust not exceed 12.8 amps (15.3 ampsbelow 70°F (21°C) ).15. Heater should ignite within 40 seconds fromtime heater control switch is turned on.16. The flame detector switch must transferwithin 200 seconds. Transfer will beindicated by the pilot lamp and a drop inamperage draw. Move the heater controlswitch to RUN. Amperage draw must notexceed 1.5 amps (4 amps below 70°F(21°C) ). While burner is igniting and prior toflame switch transfer, check burner seal forsigns of fuel leakage. If leakage is present,replace packing gasket (page 14–57).17. If the heater fails to ignite or is slow to setflame, clean the igniter cavity and install anew igniter (see your –20).18. If the flame detector switch does nottransfer within the required time limits, theburner is bad. Replace heater if burner isbad.19. Allow the heater to burn one minute on HIheat, then move heater control HI-LOswitch to LO. Burning and blower speedshould continue, but slow down. If theheater goes out, replace the fuel controlvalve (page 14-48) and heater end cover.GO TO NEXT PAGE14-65
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