TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
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TM 9--2350--311--10 Change 6 2--252.1 2--17 OPERATING AUXILIARY EQUIPMENT — CONTINUED 2--17.1 Personnel Heater (P/N 11669489--1 and 11669490--1) — Continued d. Emergency Shutdown WARNING In the event of an emergency shutdown, DO NOT TOUCH the heater until it has had sufficient time to cool. The heat exchanger remains at full temperature and the heater will not have completed a purge cycle, both of which pose a safety hazard. In the event of an unsafe condition, and the heater does not automatically shutdown or respond to the manual shutdown procedure, and an emergency shutdown is required, perform the following sequence: 1 Disconnect the power circuit breaker to the heater. 2 Disconnect the heater power by detaching the MS power connection from the heater. Manual Purge 1 Move START/OFF/RUN switch (1) to OFF position. 2 Move START/OFF/RUN switch (1) on heater control box (2) momentarily to START position for at least 10 seconds, then to OFF. This will allow heater to purge. (This will take approximately four minutes.)