Brooks On-Board 8, Installation And Maintenance Instructions Manual

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Cryo-Torr 8600 Compressor Operation, Installation and Maintenance Guide
©2013 Brooks Automation Inc. Pub. No. 8040564, Rev. AA, 01/15/13 ECO No. 64541 4-9
decontaminated.
CAUTION
Be sure to use two wrenches to ensure that the self sealing coupling adapter does not back
out during disassembly. Disconnect the helium supply line. Refer to
Figure 4-4 .
11. De-pressurize the coldhead to between 30 and 50 psig (200 and 330
kPa) by slowly opening the ball valve and allowing the helium to
bleed out slowly.
CAUTION
Reducing the coldhead pressure below 30 psig (200 kPa) may introduce more contaminants
into the helium circuit.
12. Perform the following Steps in sequence:
NOTE: Refer to appropriate Compressor Installation, Operation, and
Maintenance Instructions for the correct static helium charge pressure.
a. Back-fill the coldhead with helium to the correct static
charge pressure by adjusting the regulator to the required
pressure, and opening the Hoke valve on the manifold.
Close the Hoke valve when the pressure is correct.
b. De-pressurize the coldhead to between 30 and 50 psig (200
and 330 kPa) by slowly opening the ball valve and allowing
the helium to bleed out slowly. Do not reduce the pressure
to less than 30 psig or the coldhead may be further
contaminated.
c. Perform the flushing Steps 12a and 12b four more times.
d. Again back-fill the coldhead to the correct static charge
pressure and run the coldhead drive motor for 10 to 30
seconds by using the remote keypad. Ensure the network
cable is removed and press CONTROL and 1 to turn the
motor on. Press 0 to turn the motor off.
e. Repeat Steps b - d four times. There are a total of 5 drive
motor runs with five flushes each for a total of 25 flushes.
NOTE: Refer to appropriate Compressor Installation, Operation, and
Maintenance Instructions for the correct static helium charge pressure.