Maintenance
Charging and Venting
Charging or venting is required whenever the equalization pressure of the system is outside the
range as stated in the Specifications section of the compressor manual. See these
Specifications for equalization pressures at different ambient temperatures.
Venting a component to atmospheric pressure is required if leaking self-sealing couplings need
to be disassembled for repairs. Refer to the appropriate component manual.
EXPLOSION HAZARD. AVOID INJURY. Never use compressed gas from a
cylinder without a proper regulator. Overpressure can cause personal injury if
the system equipment ruptures. Always wear eye protection when handling
pressurized gas lines and other pressurized equipment.
PREVENT EQUIPMENT DAMAGE. For compressors with a charge/vent fitting,
use one wrench to support the body of the charge/vent fitting while removing or
installing the dust plug or the charge line nut with the other wrench. Do not over
torque.
AVOID CONTAMINATION. Follow charging and venting procedure to prevent
reversed flow of system gas. Reversed flow can result in contamination of the
system with compressor oil.
Do not charge through the supply coupling. Do not vent through the return
coupling.
Optional adapter fittings to charge, vent and cleanup the system are available
from SCAI.
Charging Procedure
PREVENT SYSTEM MALFUNCION. Repeatedly charging the system with
helium gas rather than locating and repairing gas leaks can cause a malfunction.
Impurities are introduced at an abnormal rate
and
can freeze in the cold head.
Refer to the Maintenance section of the Compressor manual.
Venting Procedure to Adjust the Equalization Pressure
Refer to the Maintenance section of the Compressor manual.
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