C30VR Compressor Installation, Operation, Maintenance and Troubleshooting
7-6
ULVAC CRYOGENICS INCORPORATED
The following describes how to adjust the helium pressure.
(1)
Reducing the helium pressure
1. Using an appropriate screw driver, unscrew the six screws at the front panel of the
compressor and remove the panel (See Figure 7-8).
2. Open the Helium fill valve inside the compressor slowly by turning its knob
counter-clockwise. Release the small amount of helium gas.
3. Wait until the helium pressure gauge reads the prescribed standard value described
above. When the pressure reaches the standard value, close the valve by turning its
knob clockwise.
4. Replace the front panel of the compressor with the six screws.
Immediately after the compressor is shut down, some areas inside may remain hot. Wait at
least 15 minutes until it cools down to conduct the work safely. Failure to observe this
WARNING
warning may result in severe bodily injury.
Pressure adjustment must be done when the equipment inside the compressor are at room
temperature. Wait for about three hours until it cools down before performing this work.
Summary of Contents for C30MVER
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