Routine Maintenance
8-4
1) Turn the system off.
2) Allow the entire system, both the compressor package and the cold head, to come to
room temperature.
3) Use only high purity helium with a minimum purity of 99.999%.
4) Check that the helium source and regulator are capable of pressurizing to the desired
pressure.
5) Make sure the service valve is closed.
6) Attach the service Aeroquip coupling to the service access port.
Figure 8-2: Service valve and access port
7) Attach a charging line from the service Aeroquip to a typical vacuum/charging
system as shown in Figure 8-3 and Figure 8-4 below.
Figure 8-3: Vacuum/charging system
Service
Aeroquip
Couplin
Charging hose
Service Valve
3.0‐7.0SCFMDirectDrive
VacuumPump
HighPressureRegulator
99.9995%Helium
VacuumGage
HeliumLine
Charging
Lines
Vacuum
Manifold
HeliumTankValve
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