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TRUCK SERVICE MANUAL
TM 5-4210-230-14&P-1
BODIES AND CABS
SAFETY PRECAUTIONS
Refrigerant 12 is classified as a safe refrigerant; however,
certain precautions must be observed to protect the parts
involved and to prevent personal injury to the serviceman.
One of the most important safety measures to be taken while
servicing the air conditioning system is adequate and constant
protection of the eyes. Safety goggles or other adequate eye
protection must be worn. The temperature of liquid refrigerant
is a -29.5 deg. C (-21.7 deg. F). Serious injury or blindness
could result from refrigerant contacting the eyes.
If refrigerant should contact the eyes, DO NOT rub them.
Splash the eyes with cold water to gradually get the
temperature above the freezing point. Consult a doctor or eye
specialist immediately.
Should liquid refrigerant come in contact with the skin, the
resulting injury should be treated the same as though the skin
has been frostbitten or frozen.
Liquid refrigerant evaporates so rapidly that the resulting gas
may displace the oxygen surrounding the work area,
especially if that area is relatively small and enclosed.
To prevent possible suffocation in an enclosed area, always
discharge the refrigerant from the air conditioning system out-
of-doors or into an exhaust collector system. Be certain that
good ventilation is always maintained around the work area
when discharging the system.
Do not smoke or allow any type of fire or flame in the
immediate area while servicing the refrigeration system.
Refrigerant 12 is not combustible; however, in the presence of
fire it changes to a highly poisonous and deadly phosgene
gas. This gas will also tarnish bright metal surfaces.
Never weld, solder, steam clean or use any excessive amount
of heat on any of the refrigerant lines or components of
refrigeration system while the system is charged. Heat
applied to any part would cause the pressure of the refrigerant
within the closed system to become excessive.
Be certain that pressurized refrigerant containers are never
exposed to open flame or temperatures above 51 deg. C (125
deg. F). Do not discard empty refrigerant containers where
they are likely to be subjected to the heat of trash burners, etc.
Always use correct refrigerant hoses (freon type) when
replacing them. Do not use hoses other than those specified
for refrigeration use.
SPECIAL SERVICE TOOLS
Servicing the air conditioning system effectually
requires proper tools and equipment especially designed for
this work. Recommended tool equipment is shown below.
For further information and sources of this equipment
refer to Service Tool Manual, CTS-1147.
High Vacuum Pump
The SE-2446 High Vacuum Pump (Fig. 24) is used
to evacuate air and moisture from the air conditioning system
prior to charging the system with refrigerant. This pump is
capable of removing all moisture and non-condensable gases
from the system.
CTS-2731 Page 15
PRINTED IN UNITED STATES OF AMERICA
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