Specifications

8200 Compressor Installation
Installation, Operation, and Service Instructions Connecting the Compressor to the Cold
Brooks Automation 8040353
Revision 108
4-9
Connecting the Compressor to the Cold Head
Make the connections between the cryopump and compressor. See Figure 4-5 on page
4-10.
1. Remove dust plugs and caps from the supply fittings and return lines, com-
pressor, and cold head. Check all fittings.
2. Connect the helium-gas return line from the gas-return connector on the rear of
the compressor to the gas-return connector on the cold head.
3. Connect the helium-gas supply line from the gas-supply connector on the rear
of the compressor to the gas-supply connector on the cold head.
4. Attach the supply and return line identification decals (CTI-Cryogenics sup-
plied) to their respective connecting piping ends.
5. Verify proper helium supply static pressure by confirming that the helium
pressure gauge reads 245-250 psig (1690-1725 kPa), in an ambient temperature
range of 60 to 100°F (16 to 38°C).
NOTE: To ensure the compressor continues to perform optimally, do not run it unless it is
connected to a cryopump or waterpump.
If the indicated pressure is higher than 250 psig (1725 kPa), reduce the pressure
as follows:
a. Remove the flare cap from the gas charge fitting located on the rear of
the compressor.
b. Open the gas charge valve very slowly. Allow a slight amount of helium
gas to escape until the helium pressure gauge reads 250 psig (1725 kPa).
c. Close the gas charge valve and reinstall the flare cap.
If the indicated pressure is lower than 245 psig (1690 kPa), add helium gas as
described in Helium Circuit Decontamination on page 5-9.