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CUSTOM AIR CONDITIONING
I
B-29
(
USING J 5420 ADAPTER
CCUMULATOR
4689
Fig. 16-24 Discharging the 1977 C.C.O.T.
A,C System
Without
J
23500-01 Station
2 and C.C.O.T. REFRIGERANT OIL DISTRIBUTION for
specific quantity instructions).
5. Following these procedures will prevent accidental
high-side vehicle system pressure being subjected to the
Charging Station in the event an error is made in valve
sequence during compressor operation to pull in the
Refrigerant-1 2 charge.
6.
See
ADDITIONAL
CHARGING
INSTRUCTIONS on following page.
DISPOSABLE CAN OR REFRIGERANT DRUM
METHOD
ADDING OIL TO THE C.C.O.T. A/C SYSTEM
should take place after Discharge
and before Evacuation procedures by removing the
refrigeration suction hose at the Accumulator outlet pipe
connection, pouring the correct quantity of refrigerant oil
into the hose or pipe and then properly reconnecting hose to
pipe (see Discharging Step No.
2 and
C.C.O.T.
REFRIGERANT OIL DISTRIBUTION for specific
quantity instructions).
0
If the Refrigerant-12 drum is used, place it on a scale
and note the total weight before Charging. Watch the scale
during Charging to determine the amount of R- 12 used.
0
If disposable R- 12 cans are used close the tapping valve
and then attach can(s) following instructions included with
the tapping valve or tapping manifold adapter.
1. Connect Manifold Gage Set J 5725-04 as shown in Fig.
1B-25.
LOW pressure gage set valve to Accumulator.
0
Gage set center hose to Refrigerant-12 source
High pressure gage set valve to vacuum pump.
2. TO BEGIN EVACUATION OF THE C.C.O.T. A/
C SYSTEM, with Manifold Gage Set and Vacuum Pump
as illustrated in Fig. 1B-25, SLOWLY open high and low-side
gage valves and begin vacuum pump operation. Pump the
system for 15 minutes after low-side
gage reaches 28"-29" vacuum or more.
NOTE: In all Evacuation procedures, the specification
of 28 "-29" of Mercury vacuum is used. This specification
can only be reached at or near sea level. For each 1,-
000 feet above sea level, specification should be
lowered by one inch of mercury vacuum. At 5,000 feet
elevation only 23"-24" of vacuum is required.
If prescribed vacuum can't be reached, close vacuum
control valve, shut off pump and look for a leak at
connections or pump.
3. When the system is fully Evacuated, close the high-
side gage set valve and turn OFF the vacuum pump.
4. Water low-side gage to be sure vacuum holds for 5
(FIVE) minutes. Proceed to Charging if vacuum is held.
5. I F VACUUM DOES NOT HOLD FOR 5
MINUTES, charge system with 1/2 pound Refrigerant-12
and leak check. Discharge system again and repair leak as
necessary. Repeat Evacuation procedure.
TO BEGIN CHARGING OF THE C.C.O.T.
A/C SYSTEM
With the Refrigerant-12 drum or can@) inverted, open
R-12 source valve(s) and allow liquid R-12 to flow into
system (see "Refrigerant Charging Capacities" for full-charge
requirement). See following ADDITIONAL CHARGING
INSTRUCTIONS.
Additional Charging Instructions
If sufficient R-12 has not flowed into the system, use the
compressor as follows to draw in the remainder of the R- 12
charge.
1. Shut off R-12 source valve.
2. Jumper wire the C.C.O.T. System thermostatic switch
by removing connector from switch and installing jumper in
connector to keep compressor clutch from cycling.
3. Start engine, run with choke open and fast idle speed
reduced to normal idle, set A/C control on NORM and
blower speed on HI.
4. SLOWLY re-open R-12 source valve and control to
maintain 40 p.s.i. (276 kPa) or less LOW-SIDE gage reading
to draw in balance of required full-charge amount of R-12.
NOTE: During this Charging, operation can be sped by
placing a large volume fan to pass air over the condenser.
If condenser temperature is maintained below charging
cylinder temperature, Refrigerant-12 will enter system
more rapidly.
5. Shut off R-12 source valve and run engine for 30
seconds to clear lines and gages.
6. With the engine running, remove the charging low-
side hose adapter from the Accumulator service
fittings. Unscrew rapidly to avoid excess R-12 escape from
system.
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