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AIR CONDITIONING
24-41
good condition, the vacuum will go as low as
28
inches.
(4)
Allow the vacuum pump to operate with the
suction gauge registering
26
to
28
inches of vacuum
for a minimum of five minutes.
(5)
Close both. gauge set manifold valves, turn off
the vacuum pump and remove the test hose from the
vacuum pump. Leave the gauge
set
manifold con-
nected to the compressor. Charge the system with the
proper amount of refrigerant
12.
NOTE: Failure to pull at least
26
inches of vacuum
indicates a leak in the refrigeration system or a de-
fective vacuum pump. Locate and correct the
trouble before recharging the system.
CHARGING THE SYSTEM (Fig. 54)
of refrigerant
12.
Plymouth models require three cans or
45
ounces
NOTE: An accurate scale must be used to insure
charging with the proper amount of refrigerant.
The special refrigerant dispensing manifold permits
NOTE: Keep the refrigerant manifold valves capped
when not in use. Keep a supply of extra refrigerant-
can-to-refrigerant-manifold gaskets on hand so that
gaskets can be replaced periodically. This will in-
sure a good seal without excessive tightening of the
can or the manifold nuts.
(1)
Attach the center hose from the gauge
set
man-
charging three full cans of refrigerant at one time.
ifold to the refrigerant dispensing manifold. Turn the
refrigerant manifold valves completely counterclock-
wise so that they are fully open. Remove the protec-
tive caps from the refrigerant manifold.
(2)
Screw the refrigerant cans into the manifold.
Be sure the manifold-to-can gasket is in place and
in good condition. Tighten the can and the manifold
nuts to
6
to
8
foot-pounds.
(3) Turn the three refrigerant manifold valves com-
pletely clockwise to puncture the cans and close the
manifold valves.
(4)
Turn the refrigerant manifold valves counter-
clockwise to open them.
(5)
Momentarily loosen the charging hose at the
gauge set manifold to allow the refrigerant gas to
purge air out of the charging hose.
(6)
Place the three cans of refrigerant into a pan
containing hot water at a temperature of
125
de-
grees F.
(7)
Start the engine and adjust the speed to
1250
rpm.
(8)
Charge the system through the suction side of
the system by slowly opening the left-hand gauge
set
manifold valve. Adjust the valve as necessary so the
charging pressure does not exceed
50
psi. Maintain
the temperature of the water in the pan by adding
warm water as necessary.
When all three cans of refrigerant are completely
empty, close the gauge set manifold valves and the
refrigerant manifold valves.
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