Olicom 9600 - Manual (Page 47)

Maintenance
5-4 P/N 8040540
C
HELIX TECHNOLOGY CORPORATION
- TI CRYOGENICS
Adjusting System Helium Pressure
NOTE: These procedures can be performed on a compressor that is turned
ON or OFF. However, the helium pressure gauge should be set to the static
helium charge pressure value if the compressor is turned OFF or set to the
normal system operating pressure if the compressor is turned ON. Refer to
Section 4 - Operation for more information.
Reducing Helium Pressure
NOTE: You must obtain the normal system operating pressure from the
Compressor Operation procedure in Section 4 - Operation in order to
perform this procedure. If the normal system operating pressure is
unknown, then shut the compressor OFF and perform the Static Helium
System Pressure Verification procedure in Section 4 - Operation instead.
1. Remove the flare cap from the gas charge fitting as shown in
Figure 5-3.
Figure 5-3: 9600 Compressor Helium Pressure Control Components
2. Open the gas charge control valve very slowly to allow a slight
amount of helium to escape. Leave the valve open until the helium
pressure gauge indicates one of the following:
• To the appropriate value in Table 4-1 if the compressor is OFF and
acclimated to a temperature between 60º F and 80º F
(15.5º C - 26.6º C).
GAS CHARGE FLARED FITTING
HELIUM PRESSURE
GAUGE
REAR PANEL
GAS CHARGE
CONTROL VALVE