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Figure No. 10 Service valve
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Figure No. 11 Refrigerant diagram
WARNING
Do not allow the refrigerant to escape in a closed space
around or near an open flame as a poisonous gas is manu-
factured when R12 burns.
b. Leak Testing the Refrigerant System.
Remove the valve stem caps from the suction and discharge
(1)
valves.
(2)
Backseat the valves by turning them counterclockwise.
Remove plugs from service valves.
(3)
(4)
Install 1/8 inch pipe x 1/4 inch flare fitting in each valve.
(5)
Attach a hose from each side of a gage set to the respective
valve.
(6)  Attach the common line of the gage set to a refrigerant drum
and open both service valves slightly and both sides of the gage set
allowing the tank pressure to build up in the system.
Test the entire refrigerant system with a Halide torch.
(7)
(8)  Backseat the service valves and close the gage valves and re-
frigerant drum valve and remove the gage set.
(9) Replace both plugs and install valve stem caps (figure 10).
c. Evacuation of the System.
(1) Remove the service valve stem caps.
(2) Backseat the valves by turning them counterclockwise.
(3) Remove plugs from valves and install 1/8 MPT x 1/4 inch flare
pipe fitting.
(4) Connect refrigerant compound gage to the suction valve and a
regular pressure gage to the discharge valve by means of a gage set.
(5) Connect the center hose to suction of the vacuum pump.
(6) open suction service valve slightly.
(7) Start vacuum pump and open gage valves.
45

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