TM 10-4520-262-12&P 0006 00
STOPPING THE HEATER
When the ON/OFF switch (1) is placed in the OFF position, the green HEATER ON/ON-HOLD advisory
light (2) will go out and the fuel supply is shut off via the fuel solenoid valve; however, the combustion
blower assembly and heated air blower fan continue to operate as the heater control assembly goes to
the post-purge mode. The fans can be heard as they continue to run during the post-purge cycle.
Do not move or refuel the heater, or remove ducts or pipes, until all fans have stopped
running. Small, portable, shelter heaters of this type are not designed to be moved during
operation or before purge cycles are complete. Serious injury, skin burns, or death can
occur if the heater assembly is moved while operating or before the HEATER ON/ON-
HOLD advisory light goes OFF and the blower fans stop.
During operation, some metal components of the heater assembly, such as the debris
grill on the outlet duct, the upper and lower heater housing assemblies, combustion
exhaust pipe (near heat exchanger), etc., can cause severe burn injuries if contact with
bare skin occurs.
Complete heater shutdown is indicated by the stopping of the combustion blower assembly and heated
air blower fan. The remaining advisory lights will extinguish as each heater sequence that the respective
lights monitor ceases operation.