Subaru 1600 Service Manual page 570

HEATING, VENTILATING AND AIR-CONDITIONING SYSTEM
6) Observe oil separator oil level
gauge. If rise of oil level has stopped,
immediately stop compressor opera-
tion. (This indicates that oil has been
withdrawn.)
NOTE:
a. Do not continue oil withdrawal
operation more than 10 minutes.
b. In some cases, fluid refrigerant may
be mixed with oil, causing unusual
rise of oil level. In such a case, stop
compressor operation after ten
minutes of withdrawal operation.
7) Discharge system. (Refer to "Dis-
charging System.")
8) Disconnect oil separator, two
flexible hoses and double union from
system.
9) Connect refrigerant lines to origi-
nal positions.
10) Disconnect low flexible hose
from compressor suction valve.
11) Add 120 rn1 (4.1 US fl
OZ,
4.2
Imp fl oz) of new compressor oil from
compressor suction valve.
After charging, rorate compressor
clutch with hand 5 to 10 turns.
12) Connect low flexible hose to com-
pressor suction valve. Evacuate and
charge system. (Refer to "Evacuating
System and Charging Refrigerant".)
13) Conduct leak test and perform-
ance test.
14) Gradually loosen drain cap of oil
separator to release residual pressure.
Remove cap and drain oil.
15) To prevent formation of rust and
intrusion of moisture or dust, perform
the following before placing oil separa-
tor kit into storage.
(1) Cap each opening of two flexible
hoses and double union securely.
(2) Cap oil separator, evacuate it from
service valve, and charge refrigerant.
7) Checking for Leaks
Conduct a leak test whenever leakage
of refrigerant 'is suspected and when
conducting service operations which
are accompanied by disassembly or
loosening of connection fittings.
Refrigerant is a colorless, odorless gas
and leakage from system is difficult
to detect. Accordingly, the use of a
leak detector facilitates check for
leaks. Two methods of checking are
1 Oil separator
2 Double union
3 Flexible hose [1.5 m (4.9 ft»)
4 Connector pipe
Fig. 13-62
available; one employs a halide leak
detector which burns propane gas or
butane gas and the other is an electric
type leak detector.
Halide leak detector
Since the propane leak detector and
butane leak detector are the same in
respect to their operation, this section
6
Fig. 13-63
13-25
ST-182
describes the operation of the propane
leak detector.
The copper screen is heated by the
burning of propane. Refrigerant gas
decomposes to color the flame when it
contacts the heated screen. The gas to
be checked is drawn into the sampling
tube and sent out to the burner. A
refrigerant leak can clearly be detected
by variations in the color of the flame.
I Copper reaction plate
2 Flame adjusting lines
3 Burner
4 Sampling tube
5 Strainer
6 Gas bomb
7 Flame adjuster
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