7-40
EQUIPMENT
-
Heater and Air Conditioning
Meltable
bolt
/
(Abolished)
w
iccan
Section A-A
’
it
20x0197
New refrigerant
system
Conventional
refrigerant
system
Charging hose
CONDENSER FAN AND RADIATOR FAN CON-
TROL
For information on condenser fan and radiator fan control,
a
refer to Group 1 Control System of Engine.
RECEIVER
l The new refrigerant
(R134a)
is highly
hygroscopic
and
would require much more amount of conventional desiccant
(silica gel) to be kept dry.
The new desiccant (molecular sieve) used for drying the
refrigerant has enough capacity to absorb moisture without
need for change to the receiver capacity.
l
In the conventional design, the meltable bolt on the receiver
fuses to let out the refrigerant gas in its entirety into open
air when the high-pressure side pressure becomes too
high.
The new system has a relief valve in the compressor which
plays the same role as the meltable bolt but closes after
release of only necessary quantity of refrigerant, so that
the amount of released refrigerant is limited to the minimum.
NOTE
‘2
For details about the relief valve, see COMPRESSOR,
P.7-37.
SERVICE VALVE
A quick-disconnect type joint, instead of conventional screw-in
type joint, is used for the service valve to prevent incorrect
charging and enhance serviceability.
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