Section IV OPERATION UNDER UNUSUAL CONDITIONS

TM 5-4110-234-14

TO 40R7-5-7-1

Section IV OPERATION UNDER UNUSUAL CONDITIONS

Para.

Operation in Extreme Cold ..............................2-9

Operation Under Rainy or Humid Conditions........ 2-12

Operation in Extreme Heat ............................2-10

Operation in Salt Water Areas .............................. 2-13

Operation in Dusty or Sandy Areas ..............2-11

Operation at High Altitudes ................................... 2-14

2-9. OPERATION IN EXTREME COLD

Operation is basically the same as under usual conditions. It is best not to disturb wiring during extremely cold weather

since wire and insulation become brittle and may easily be broken. For Model F10000RG-2 check the following items

closely:

a. Use correct oil for temperature conditions (fig. 3-1). Change oil only when engine is warm.

b. Use fresh fuel.

c. Keep fuel system clean and batteries in a well charged condition.

d. Partially restrict condenser air flow, but use care to avoid overheating.

2-10. OPERATION IN EXTREME HEAT

Operation is basically the same as under usual conditions, but take extra care that condenser air flow is not hampered

by obstructions in front of coil. Notify direct support if coil is dirty. For Model F10000RG-2 when operating the engine in

temperatures above 75F (24C), pay particular attention to the following items to prevent damage:

a. Keep the engine cooling fins clean and free of obstruction which would decrease air flow to and from the engine.

CAUTION

Plugged or clogged cooling fins can cause overheating and engine damage.

b. See that nothing obstructs air flow to and from the engine.

Ensure that you are using the proper grade and weight of oil for the temperature the engine is being used in (para.

3-2). Check the oil level each time you fill the fuel tank.

d. Check the battery water level more frequently than every 50 hours which is recommended under normal

conditions. High temperatures cause faster evaporation.

2-11. OPERATION IN DUSTY OR SANDY AREAS

Sand, dust, dirt, smoke, soot and other debris can seriously reduce the efficiency of the air conditioner. Where this

contamination is a problem, it is essential that the frequency of maintenance performed on the coils, filter and fans be

increased. Observe the following precautions:

a. Clean refrigerator frequently. Dirt or dust accumulation on the condenser tubes and fins may cause increased

compressor discharge pressure. If tubes or fins are coated, decreased efficiency of the refrigeration unit will result.

b. Keep all controls and wiring covered as much as possible.

c. For Model F10000RG-2 take these additional precautions:

2-15