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24-14
AIR CONDITIONING
in the system or refrigerant has been allowed to es-
cape by depressing one of the service port valves.
For detailed instructions on the proper procedure for
checking refrigerant level, refer to "Refrigerant
Level."
TEST
2.
Before adding refrigerant when the cause of the
low level is not known, the system should be tested
for leaks. Assuming no leaks are present, or that leaks
have been corrected without discharging the system,
proceed with partial charge.
Install and connect the gauge set manifold valves,
as shown in Figure 17.
(1) Close both of the gauge set manifold valves.
Open the gauge set manifold needle valve.
(2) Connect the evaporator suction gauge test hose
to the suction service port of the compressor and
connect the discharge gauge test hose to the dis-
charge service port of the compressor.
(3) Connect one end of the long test hose to the
center manifold outlet and the other end to the re-
frigerant dispensing manifold.
(4)
Close two of the dispensing manifold valves
and open the remaining dispensing manifold valve.
Remove the protective cap from the opened valve.
( 5 )
Screw a can of refrigerant 12 to the opened
manifold valve. Be sure the gasket is in place and in
good condition. Tighten the refrigerant can and the
manifold locking nut to insure a good seal. Do not
over-tighten since 6 to 8 foot pounds is sufficient if
the gasket is in good condition.
(6) Turn the manifold valve (above the refrigerant
can) completely clockwise to puncture the can. This
closes the valve and seals the refrigerant in the can.
(7)
Place the refrigerant in a large pan of water
heated to 125°F. Place the pan of water containing
the refrigerant can on an accurate Scale, Tool C-3429,
so that the amount of refrigerant added
can
be
weighed. Open the refrigerant manifold valve.
(8) Purge all air from test hoses. Air in the system
will be trapped in the condenser causing abnormally
high discharge pressures and interfering with con-
densation of the refrigerant.
DISCHARGE
SERVICE PORT
ADAPTER
\
Fig. I7-Adding
Partial Refrigerant Charge
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