Buick LeSabre 1965 Service Manual page 837

1 1 - 1 0 4 OPTIONAL HEATER-AIR CONDITIONER SYSTEM
ACCESSORIES
ADAPTER
J - 5 4 2 0
_ COMPRESSOR
„ (TOP VIEW)
MANIFOLD
J-5415 ~
LOW PRESSURE
GAGE J - 5 4 1 7
SUCTION
THROTTLE
VALVE
HIGH PRESSURE
GAGE J-5416
GAGE LINES (5)
J-5418
VALVE J - 5 4 6 2 - I
F-12
.Jn r,
VACUUM PUMP J - 5 4 2 8
Figure 11-153—Setup for Evacuating, Leak Testing and Charging System
to charge the system at cylinder
pressure. After closing the cyl-
inder valve, leak test the complete
system including gauge connec-
tions and correct any leaks found.
Then re-evacuate system.
5. After 28 inches of vacuum has
been maintained for ten minutes,
close the vacuum pump shut-off
valve and stop the pump. Observe
gauge and if loss of vacuum is 2
inches or more in 5 minutes,
there is a leak in the system and
must be corrected.
6. If system checks out, charge
the system with refrigerant-12 at
cylinder pressure. Then with re-
frigent-12 cylinder valve closed,
again evacuate the system with
pump at 28 inches of vacuum for
ten minutes. This charging and
second evacuation is for the pur-
pose of removing any air or
moisture that may have entered
the system.
7. After maintaining the 28 inches
of vacuum for ten minutes, close
the vacuum pump shut-off valve
and stop the pump. The refrig-
erant system is now ready for
charging.
b. Charging the System
1. With the vacuum pump, refrig-
erant-12 cylinder and gauge set
connected to the compressor as
shown in Figure 11-153, place the
cylinder in a bucket of hot water
which does not exceed 125°F.
CAUTION: Never heat refrig-
erant cylinder above 125°F, as
tremendous hydrostatic pressures
will develop, capable of rupturing
cylinder. When there is a pos-
sibility of overheating cylinder,
the cylinder must be opened to a
suitable pressure relief mecha-
nism at all times.
2. Place cylinder and bucket on a
suitable scale and record the total
weight.
3. Open the low pressure valve
on the gauge set. (High pressure
valve on the gauge set closed.)
4. Wearing goggles to protect
eyes, fully open the refrigerant-
12 cylinder valve and allow re-
frigerant-12 vapor to flow into
the refrigerating system.
5. Operate engine and compres-
sor at slow idling speed until a
total of 4-1/4 pounds of refrig-
erant-12 have been charged into
the 45000, 46000 and 48000 Series
system or 3-3/4 pounds of re-
frigerant-12 in the 49000 Series
system. It may be necessary to
reheat the water in bucket to
maintain required pressure.
6. Close both valves on gauge set,
close valve on refrigerant-12 cyl-
inder, and remove cylinder from
bucket of water.
IMPORTANT: Whenever the re-
frigerant system is discharged
and recharged, it is necessary to
cycle the suction throttle valve
several times to normalize the
piston diaphragm in the valve.
This is done on the 49000 by mov-
ing the air conditioner tempera-
ture control lever from one
extreme to the other.
On the 45000, 46000 and 48000,
operate WARMER lever several
times.
7. Perform functional test, para-
graph 11-19.
8. After test is completed, re-
move gauge lines and replace
protective caps over Schrader
Valve f i t t i n g s and t i g h t e n
securely.