Description
Accumulator: Contains reserve coolant and applies atmospheric pressure to the circulating
coolant. A rubber diaphragm separates the coolant from the atmosphere.
AVOID INJURY. Coolant fluid is a 30% ethylene glycol/water mixture. TOXIC:
Do not ingest. Contact local environmental authorities for proper disposal of
ethylene glycol mixtures.
Adsorber: The adsorber removes any oil and moisture the gas is carrying which did not drop
out in the separator. This vessel contains activated charcoal for oil adsorption. The adsorber
has a finite life and must be replaced every 30,000 operating hours.
Air Heat Exchanger: Uses copper tubes and aluminum fins to transfer the coolant heat to the
room air moved by the fan.
Circulator: Pumps coolant at approximately 8 liters/minute. It has wet rotor construction and
requires no regular maintenance.
Compressor Capsule: The rotary, positive displacement compressor capsule is hermetically
sealed. Electrical connections to the motor are made at terminals under a protective cover on
top of the housing.
If oil needs to be added to the compressor, an oil charging vessel (with oil), P/N 263775A3 is
available as an accessory from SCAI.
Coolant Pressure Relief Valve: Set at 80 psig (552 kPa), this relief valve prevents the coolant
circuit from operating at an unsafe pressure.
Fan: Moves room air through the air heat exchanger.
Gas Equalization Solenoid Valve: This solenoid valve opens when the compressor is stopped.
The valve allows the helium gas pressure across the compressor to equalize, to prevent oil from
being blown out of the compressor into the low-pressure (return) gas line.
Gas High Temperature Switch: Located on the supply gas line near the top of the compressor,
the switch opens at 93
º
C (200
º
F) and stops the compressor if the gas temperature is too high.
Heat Exchanger: The heat exchanger consists of three coils wrapped around the compressor
capsule. One cools helium, another cools the compressor shell and another cools oil in the oil
injection circuit. This circuit cools oil that has absorbed heat from the compressor and reinjects
the cooled oil, which continues to absorb heat from the compressor.
Helium Pressure Relief Valve: Set at 400 psig (2760 kPa), this relief valve prevents the
compressor from operating at an unsafe pressure.
Internal Relief Valve: The internal by-pass valve opens to allow the compressor to be run
when the system gas lines are disconnected, to avoid overloading the compressor capsule.
Oil Capillary: The capillary returns oil collected in the oil separator sump to the low-pressure
side of the compressor for recycling.
Oil Filters: There are two oil filters. One filter in the oil separator drain line protects the return
oil capillary. The other filter in the oil injection circuit protects the compressor.
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