Case 580SR, Service Manual

Page: 779 / 1068

SECTION 50 - CAB HEATING AND AIR CONDITIONING 19
COOLANT
To achieve the absorption and the release of heat
which is, in essence, the function of an air condition-
ing system, requires the use of a suitable “refriger-
ant” a liquid that has a relatively low temperature
boiling point, plus certain desirable safety and sta-
bility features.
The refrigerant used in the air conditioning system is
refrigerant
HFC 134a .
NOTE: to help protect the environment legislation
has been introduced in most territories banning the
release into the atmosphere of refrigerants, includ-
ing HFC 134a. All service procedures contained in
this manual can be carried out without the need to
release refrigerant into the atmosphere.
In order to prevent the incorrect type of refrigerant
being charged to the system the service valves fitted
to the Backhoe Loader and necessary to connect up
refrigerant recovery, evacuation and recycling/re-
charging equipment will be of two different sizes as
recognized and specified by the air conditioning in-
dustry.
S WARNING
Coolant HFC 134a is not compatible with coolant
R-12. Do not try to replace coolant HFC 134a with
coolant R-12 or to test the system using instruments
or attachments previously used with R12, as the
system could get damaged.
HFC 134a refrigerant is stable at all operating tem-
peratures and able to absorb great quantities of
heat.
The boiling point of HFC 134a is -22 °C at atmos-
pheric pressure.
If the pressure is increased, HFC 134a will readily
vaporize to absorb heat at temperatures between -
11.7 °C at 1.9 bar and 0 °C at 2.9 bar in the evapo-
rator.
At higher pressures, HFC 134a will condense and
give off heat at temperatures between 48 °C at
12.4 bar and 58 °C at 15.85 bar in the condenser.
S
WARNING
HFC 134a can be dangerous if improperly handled.
Therefore it is important the following warning and
directions are adhered to.
Never expose any part of the air-conditioner system
to flame or excessive heat because of risk of fire or
explosion, and the production of phosgene gas.
Never disconnect or disassemble any part of the air-
conditioning system as escaping refrigerant can
cause frostbite.
S WARNING
If refrigerant should contact the skin use the same
treatment as for frostbite.
Warm the area with your hand or lukewarm water
32 °C, cover the area loosely with a bandage to
protect affected area against infection and consult
a doctor immediately.
If refrigerant should contact the eyes wash imme-
diately in cold clean water for at least 5 minutes
and consult a doctor immediately.
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