Figure 7. Controls And Instruments.
18. Operation in Extreme Cold
Take all necessary precautions to protect the
air conditioner from snow and ice. Clean loose
snow from around intake area. Use a canvas
cover for protection when the unit is not
19. Operation in Extreme Heat
Keep condenser and evaporator coils and
fans clean at all times. Keep filters well
cleaned and see that there are no obstructions
which could obstruct the flow of cooling air.
20. Operation in Dusty or Sandy Areas
a. Every effort should be made to keep
dust or sand from the interior of the air con-
ditioning unit. After exposure to dust or sand,
the air filters should be thoroughly cleaned as
owned in paragraph 55. Also, all other parts
in the unit should be checked and all dust and
b. When it is necessary to operate the air
conditioner for extended periods of time in
dusty or sandy areas, a checking and cleaning
procedure should be followed at regular in-
tervals to prevent accumulation which could
impair the operating efficiency of the cooling
21. Operation Under Rainy or Humid
Take special precautions to keep the air con-
ditioner clean and dry. Use a canvas cover for
protection when the unit is not in operation.
Remove cover during dry periods and allow
equipment to dry.
22. Operation in Salt Water Areas
If the equipment is exposed to high humid-
ity in salt water areas, all accessible parts of