Maintenance
2. The adapter fitting is charged with helium gas; do not vent. Be sure the valve on the
adapter fitting is closed. With two wrenches, attach the adapter fitting to the compressor’s
return gas Aeroquip coupling.
3. Remove the dust plug, Swagelok P/N B-400-P (SCAI P/N 17505), from the adapter fitting.
4. Connect a 1/4" O. D. charge line to the pressure regulator of a helium gas cylinder
containing 99.995% pure helium with a dew point less than -50° C (-58° F) at 2070 kPa
(300 psig). Use brass Swagelok nut and ferrules (P/N’s B-402-1, B-403-1 and B-404-1; SCAI
P/N’s 12301, 12302 and 12303, respectively.) Adjust the pressure regulator to 35 kPa (5
psig).
5. While connecting the charge line to the adapter fitting, thoroughly purge the charge line from
the regulator. Slightly open the adapter fitting’s valve and release a small volume of gas
from the compressor. While both the charge line and the charge/vent valve are venting,
connect them together. It is important to remove all air contaminants to prevent them from
entering the system.
6. Adjust the pressure regulator to the desired operating or equalization pressure. See
Specifications. Slowly, fully open the adapter fitting’s valve. Charge the system with helium
gas until the desired pressure is indicated on the compressor’s pressure gauge.
7. Close the adapter fitting’s valve and the gas cylinder valve.
8. Disconnect the charge line from the adapter fitting. Store the charge line to keep it clean.
9. Reinstall the dust plug on the adapter fitting. With two wrenches, remove the adapter fitting.
10. Reconnect the return gas line or the gas manifold to the compressor. Torque the coupling
to 4.85 ± 0.7 kgf m (35 ± 5 ft. lbs.).
This completes the charging procedure using a charge/vent adapter fitting.
Helium Venting Procedure to Adjust the Equalization Pressure
Tools required: Adapter fitting P/N 266395C or 255919B2
Open end wrenches 1", 1 1/8", 1 3/16"
1. Stop the compressor.
2. Using two wrenches, disconnect the supply gas line or the supply gas manifold assembly
from the compressor.
3. Be sure the valve on the adapter fitting is closed. Using two wrenches, attach it to the
supply coupling on the compressor.
4. Slowly open the valve on the adapter fitting. Vent the compressor until the required
equalization pressure is attained. See Specifications. Close the valve on the adapter fitting.
5. Remove the adapter fitting.
6. Reconnect the supply gas line or the gas manifold to the compressor. Torque the coupling
to 4.85 ± 0.7 kgf m (35 ± 5 ft. lbs.).
This completes the procedure for venting to adjust the equalization pressure.
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