Subaru 1600 Service Manual page 571

HEATING, VENTILATING AND AIR-CONDITIONING SYSTEM
Propane type
Butane type
NO LEAK Greenish blue Pale blue
SMALL LEAK Yellow
LARGE LEAK Purple
I) Discharge refrigerant in one or
two seconds to ascertain that system
has a sufficient pressure needed for
leak detection. Charge with 0.4 kg (0.9
Ib) of refrigerant, if necessary.
2) Light leak detector. Adjust the
height of the flame between flame
adjusting lines at the top and bottom
of combustion tube. A reaction plate
will immediately become red hot.
3) Place the end of sampling tube
near the point of the suspected leak in
system.
NOTE:
a. Since refrigerant gas is heavier than
air, small leaks can
be
easily detect-
ed by placing sampling tube direct-
ly below the check point
b. Suitable ventilation is required. If
refrigerant gas is mixed with the
surrounding air, leak detector will
always indicate a response and
detection of the actual leak will be
difficult.
c. Never hold leak detector at an
angle.
Bright blue
Vivid green
CAUTION:
a. Never inhale the fumes produced
by combustion of refrigerant gas
since they are toxic.
b. Never use halide torch in a place
where combustible or explosive gas
is present
4) The flame will be almost colorless
when there is no refrigerant gas being
burned. When there is a small refriger-
ant gas leak, the flame will be green or
yellowgreen. When refrigerant gas leak-
age is large, the flame will be brilliant
blue or purple. Since the color of the
flame will be yellow when dust is
being burned or there is aging scale on
copper reaction plate, always keep the
strainer of sampling tube and reaction
plate clean.
5) Major check points
(1) Compressor
• Compressor shaft seal (rotate the
compressor by hand)
• Oil filler plug
• Flexible hose connections
• Rear cover and side cover gaskets.
• Service valve
13-26
(2)
Condenser
• Condenser pipe fitting
• Condenser inlet and outlet pipe
connections
(3) Piping
• Flared section of high pressure and
low pressure flexible hose.
• Pipe connections
• Service valve
(4) Evaporator housing
• Inlet and outlet pipe connections
• Expansion valve
Electric leak detector
For the operational procedures, refer
to the instructions furnished with each
electric leak detector.
8) Refrigerant Level Check
Sight
glass
Sight glass is provided at the top of
receiver drier. One guide for whether
there is enough refrigerant in system is
given by observing refrigerant flow
through sight glass. However, this
method is unsuitable for judging the
amount of refrigerant. The correct
refrigerant level can be judged by
measuring the system pressures in ac-
cordance with the procedures as de-
scribed "Performance Test".
I) Start the engine and hold engine
speed at 1,500 rpm.
2) Set mode lever to
Ale
position.
3) Set blower to maximum speed.
4) Check sight glass after the lapse
of about five minutes. Judge according
to the following table.
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