(a) Leave everything hooked up and see if the compound gauge rises.
1 Retighten all hose fittings if the gauge rises.
2 Repeat the leak check if the gauge continues to rise.
(b) Determine the system is good to charge if the pressure holds for 15
d. System Vapor Charge.
Connect the manifold gauges.
(a) Connect the blue hose from the compound gauge to the suction
(b) Connect the red hose from the high side gauge to the high side
Connect the yellow hose from the center on the manifold gauge to
the tank of Freon.
Open the valve on the tank (make sure the tank is upright).
(3) Open both valves at the manifold (this allows vapor to enter both high
and low sides).
Release the pressure to equalize at the gauges.
Close both valves on the manifold.
Start the compressor by plugging in the refrigerator.
(7) Let the system stabilize to check the desired pressure (open the low side
valve on the manifold to add Freon).
Continue to add Freon in this manner until you reach the desired
(a) High side 110 to 140 pounds per square inch (psi).
(b) Low side 5 to -5 psi.
Never add liquid refrigerant to a system as you will flood the system and