ULVAC CRYOGENICS INCORPORATED S-1
Compressor Unit Safety Instructions
Read this manual and follow the safety guidelines during installation, normal operation,
and when servicing the compressor unit.
Our Cryo-U
®
Cryopump and Super Trap refrigerator systems make a refrigeration cycle by
circulating high pressure helium gas. Filling helium gas more than the defined amount
does not improve refrigeration capacity appreciably. Instead, if excessive helium gas is
filled and pressure becomes higher than the defined value, gas will release from the safety
valve and its sheet may become clogged with dirt. This may even cause a leak as well as
overloading of the compressor motor.
Do not fill the helium gas more than the defined amount.
When charging helium gas or performing helium line decontamination, read the
“Maintenance” section carefully and follow the instructions. Regulators, charging hoses,
adopters or other necessary equipments that can be used at the pressure of 2.0MPaG or
above are required.
Shutdown and Start-up of a compressor unit should be less than 6 times per hour, and ON
or OFF condition should be maintained for at least 3 minutes. Switching between ON and
OFF too frequently reduce the insulation life of compressor motor and may damage the
equipment. When running multiple refrigerators, switching on and off the refrigerator
motors must be less than 6 times per hour as well.
Do not turn on and off the compressor to control the temperature of Super Trap.
Please contact us when temperature control of Super Trap is required.
1. Do not Charge Compressor with Excessive Helium
2. Adding Helium Gas and Charging Equipments
3. Do Not Switch ON and OFF Frequently
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