Evacuating The System; Charging The System - Pontiac FIREBIRD 1972 Service Manual

CUSTOM AIR CONDITIONING 1A-51
4. Open suction valve on gauge set. This will allow re-
frigerant to pass from the drum into the system.
When pressure stops rising, close suction valve on
gauge set and valve at refrigerant drum (Since the
refrigerant drum is at room temperature, only a small
refrigerant charge will enter the system).
5. Using leak detector
J
6084, check compressor shaft
seal and all fittings in the system and on the gauge set
for evidence of leakage. When general area of leak has
been found with the test torch, a liquid leak detector
may be helpful in locating the exact point of leakage.
6. After leak has been corrected, evacuate the system
again.
CHARGING THE SYSTEM
CAUTION: The refrigerant system should be
charged only after being evacuated as outlined
in E E V A CUA TING THE SYSTEM
REFRIGERANT D R U M M E T H O D
WARNING: Do not allow temperature of water
to exceed 125 F. High temperature will cause
excessive pressure and possible softening of fusi-
ble safety plugs in the refrigerant drum. It may
not be necessary to use hot water if a large drum
is used (over approximately 100 Ibs.).
3. Place refrigerant drum (in pail of water) on scales
(bathroom or commercial, preferably commercial),
Fig. 1A-48.
CAUTION: Do not turn refrigerant drum up-
side down as this would allow liquid refrigerant
to enter compressor which may cause damage.
4. If line at center gauge fitting has not been purged of
air, loosen line at center fitting on gauge set and crack
valve on refrigerant drum to blow air from line. Re-
tighten line at center fitting and record exact weight
of refrigerant tank in water on the scales.
5. Open valve on refrigerant drum and both valves on
1 . Connect center flexible line of gauge set to refrigerant gauge set to allow refrigerant to flow into system.
drum. Continue charging until the scales show that the cor-
rect amount of refrigerant (in pounds) as specified on
2. Place refrigerant drum in a pail of water which has label on the compressor has been transferred from
been heated to a maximum of 125°F. refrigerant drum to system.
COMPRESSOR
Fig. 1A-48 Schematic
-
Charging Refrigerant System