TM 5-4520-253-13
SECTION IV. OPERATION UNDER UNUSUAL CONDITIONS
2-9. OPERATION IN EXTREME COLD, BELOW 10°F (-12°C)
Thermostatically controlled fuel heater automatically heats fuel when temperature drops below 40° ±6°F (4°
+-3°C). Preheating of fuel aids combustion and ignition during extremely cold conditions. No operating pro-
cedures are required for fuel heater. Take the following steps during extremely cold conditions:
Death or serious Injury could occur if fuel is not handled
carefully. Use in a well-ventilated area away from open
frame, arcing equipment, ignition sources, heaters, or exces-
sive heat. Engines must be turned off and cool before re-
fueling. Use proper refueling procedures and equipment to
avoid spillage. Do not run engines near open fuel con-
tainers. Do not use fuel as a cleaning solvent. DO NOT
SMOKE.
a. Keep fuel tank full to prevent condensation in tank.
b. Clean snow and ice from fuel tank filler to prevent moisture from entering fuel tank, causing freezing in fuel
lines.
2-10. OPERATION AT HIGH ALTITUDES
a. Heater is designed to operate at elevations up to 10,000 feet (3046 m) above sea level without special serv-
ice or adjustment.
b. At 10,000-foot altitude (3048 m), heat output may be reduced approximately 15 percent. This is normal
condition which cannot be prevented. Optimum performance can be obtained by following all service
instructions carefully.
2-11. OPERATION UNDER RAINY OR HUMID CONDITIONS
a. Wipe ail accessible exposed areas frequently.
b. Paint all chipped or scratched surfaces to prevent rust.
c. Cover heater when not in use.
2-10
Change 1
