If the indicated pressure is lower than the specified
value, add helium gas as described in Section 6.2.
6. The last step required for installation is making
electrical connections:
lir
AWARNING
The system power switch on the compressor must be
in the OFF position before making any and all electrical
connections.
a.
Connect the cold head power cable(s) to the
rear panel of the compressor and the other
end to the electrical power connection on each
cold head.
b.
Plug the compressor input power cable into
the power source.
al-CRYOGENICS
HELIX TECHNOLOGY CORPORATION
2.3 Connecting the Cryocoolers
to the Compressor
A component interconnection diagram for a multiple
cryocooler installation is shown in Appendix I. Refer
also to Figures 1.1, 1.2 and 1.3 for the location of
components discussed below.
IS
AWARNING
Do not connect the compressor to its power source
until all connections have been made between the
components of the cryocooler.
Make the connections between the cryocoolers and
compressor:
If the indicated pressure is higher than what is
specified in your compressor manual, 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 the value indicated
in your compressor manual.
c.
Close the gas charge valve and reinstall the flare
cap.
•
1.
Remove all dust plugs and caps from the supply and
return lines, compressor, and cold heads. Check
all fittings.
2.
Install all helium tees to the compressor or cold
heads.
3.
Connect the helium return line from the gas-return
connector on the rear of the compressor to the
gas-return connector on the cold head.
4.
Connect the helium supply line from the gas-supply
connector on the rear of the compressor to the
gas-supply connector on the cold head.
5.
Verify proper helium supply static pressure by
confirming that the helium pressure gauge reading
and ambient temperature range are as specified
in the Model for the CTI compressor being used.
This static pressure applies to a typical multiple
cryocooler installation using 10-foot interconnecting
lines. If your installation has longer interconnecting
lines, then contact the Product Service Department for
assistance in calculating the static pressure.
•
•
2-2
P/N 8040272
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