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Service Instructions
1. Service Valve Operations
1-Manifold High or Low Pressure Hose; 2-Receiver Discharge or
Compressor Suction Port; 3-Liquid or Suction Line; 4-Pressure Control;
BACK POSITION FRONT POSITION MIDDLE POSITION
Fig. 7 Rotalock Valve Operation
BACK POSITION FRONT POSITION MIDDLE POSITION
Fig. 8 Base Valve Operation
Back Position
: Normal operation, manifold port is closed.
Front Position
: Storage operation, liquid or suction line connection is closed.
Middle Position
: Installation operation, all ports are open.
2. Refrigeration Piping and Leak Testing
The line sizes and refrigerant charges are listed as follows.
Model No.
Liquid
Line
Suction
Line
Recommended
Initial Charge
WM-4500DS
WM-4500DS-LA
1/4” OD
1/2” OD
R134a / 26 OZ
