TM 10-4520-262-12&P 0007 00
OPERATION IN EXTREME COLD (Temperatures Below -25°F [-31.7°C]).
When operating in conditions of extreme cold, it is recommended that the heated air outlet duct with
louver (1) and air supply inlet duct with debris grill (2) be secured to the heater and the ducts securely
connected to the tent. If the optional combustion air inlet pipe (3), and optional combustion exhaust pipe
(4) are used, they should also be secured. Refer to WP 0066 entitled Additional Authorized Items List
for specific information on these optional items. Under no circumstances should the heater or the ducts
and pipes (especially pipe ends) be allowed to be covered with snow.
If operated outside of the tent, ducts (1)(2), pipes (3)(4), and the heater (5) itself may require that they be
raised higher off the ground to prevent snow from entering the heater.
If high winds accompany extreme cold, additional anchors or tiedowns may be required to prevent winds
from shifting the equipment. (Tent stakes and line can be used as an improvised anchor and tiedown.)
The open ends of the optional combustion air inlet (3) and optional combustion exhaust pipes (4) should
be positioned next to each other, both pointed in the same direction, and pointed away from the prevailing
wind. Under no circumstances, should pipes be positioned in such a way as to allow snow to enter their
The combustion exhaust pipe (4) must be graded down to make sure that moisture contained within the
exhaust cannot freeze and partially or totally block the exhaust gases. Blocking of exhaust gases will
cause the heater to perform poorly or shut down.
If high winds accompany the snow, the fuel can stand (6) should be firmly anchored to the ground.
During refueling and at regular intervals between refueling, ducts (1)(2), pipes (3)(4), and the heater (5)
itself should be inspected for a build up of snow, dust, or sand that would cover the heater or block the
ducts or pipes. Any buildup should be removed.
During refueling and at regular intervals between refueling, the sediment strainer (7) of the heater should
be visually checked for contamination. If dirt or other contamination is present, the sediment strainer
should be serviced in accordance with WP 0020 00 entitled Solenoid Valve and Sediment Strainer
Special care should be used during refueling to prevent snow and ice from contaminating fuel, fuel can,
fuel lines, and fuel fittings.