Sumitomo F-20L, Operating Manual, Page: 16 / 56

Description
12
Gas Equalization Solenoid Valve – This solenoid valve opens when the compressor shuts
down, allowing helium gas pressure to equalize and prevent oil from moving into low pressure
side of compressor.
Gas Supply and Return Couplings
- Located on the compressor front electrical panel, both
are self-sealing, size #8, male bulkhead couplings and are the points of connection for system
gas lines.
Heat Exchanger - Uses water to cool the high-pressure helium refrigerant and the
compressor’s lubricating oil.
Helium Charge Coupling - A size 4, male (4M) coupling located on the front of the compressor
is used for charging or venting helium gas refrigerant.
Helium Discharge High Temperature Switch [TSG] – Senses helium discharge gas
temperature and shuts the compressor off if the temperature of the high-pressure helium from
the compressor is too high.
Internal Relief Valve [IRV]
- The internal relief valve opens to allow the compressor to be
operated in the stand-alone mode or when the system gas lines are disconnected, to avoid
overloading the motor.
Mains Power Receptacle - A screw-mounted rectangular connector located on the front
electrical panel and optional mains power supply cables, provide mains power supply to the
compressor.
Oil Capillary - The capillary returns oil collected in the oil separator sump to the compressor for
recycling.
Oil Filter - Filters in the oil lines protect the oil return capillary and the orifices.
Oil Injection Orifices
- These orifices are installed in the oil return lines and control the flow
rate of oil returned to the compressor.
ON/OFF Switch – Located on front electrical panel, switch is local control for starting and
stopping compressor.
Pressure Gauge - Indicates gas pressure in the supply line. When the compressor is not
running, the gauge located on the compressor’s front panel shows the equalization pressure.
Water In and Out Fittings – Two (2) Bulkhead Fitting,½" MNPT.