TM-9-2350-277-40&P Sustainment Maintenance Manual M113A3 M577A3 M1064A3 M1068A3 M58 Download
Page 187 of 472
BURN TEST 1. Secure coolant heater to test stand (Figure 5, Item 9) and coolant, fuel, electrical, and exhaust connections. Do not start the heater unless there is an ample supply of coolant. 2. Remove heater end cover (Figure 5, Item 10) and check inside for coolant leakage before starting burn test. Replace heater if coolant has leaked. 3. Place heater control switch in START position and start timing heater immediately. 4. Note ammeter 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 the heater control switch to RUN. Amperage draw must not exceed 1.5 amps (4 amps below 70° F (21° C)). 7. If the heater fails to ignite or is slow to set flame, clean the igniter cavity and install a new igniter, see TM 9-2350-277-13&P. 8. If the flame detector switch does not transfer within the required time limits, the burner is bad. Replace heater if burner is bad. 9. Allow the 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 the heater goes out, replace the fuel control valve and heater end cover (WP 0026). 10. Turn the heater control switch to OFF. Fuel flow and burning should stop in about 30 seconds. Blower should continue to run from one to three minutes and then stop. If blower does not work within limits, readjust the flame detector switch (TM 9-2350-277-13&P). If the blower still fails to work within limits, replace the flame detector switch (TM 9-2350-277-13&P). TM 9-2350-277-40&P 0025 0025‐5