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Technical Service Bulletin
Automatic Expansion Valve (AXV)
All USCS split cooling systems (except the CC Series) operate with a Pressure Regulating Valve aka. Automatic Expansion Valve (AXV). This valve promotes a constant pressure of refrigerant to the evaporator coil. Valves are preset from factory to be within tolerance and are installed in the evaporator coil prior to orders shipping out. However, the valve can be jostled out of adjustment during the shipping process. It is always recommended to verify all details of the Diagnostic Report during new installations or a trouble shooting procedure.
Normal operating pressures are 28psig-32psig.
The valve can be adjusted if necessary by following the following procedure:
*Attach manifold gauges prior to making any adjustments
1. With the system running check and record all data on the Diagnostic Report
2. Adjustments are made with the screw conveniently located in the top of the valve
3. Turning the screw ½ turn will result in a 5lb. change in pressure
CLOCKWISE- WILL INCREASE PRESSURE
COUNTER CLOCKWISE- WILL DECREASE PRESSURE
It is recommended that the system runs for 30 minutes before making any adjustments.
For every adjustment made, let system run 10 minutes before taking gauge pressure readings.
If problems continue please contact USCS for trouble shooting assistance.
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