Edwards IH Instruction Manual - Ideal Vacuum Products

• The solenoid-valve(s) in the Gas Module will open to switch on the nitrogen supplies to the
HCDP pump.
• On iH600/iH1000 systems, after the booster start delay, the HCMB pump will be switched on.
5.7 Check the nitrogen pressure and adjust if necessary
Note:
You must only check andadjust the nitrogen pressure after the iH system has been operating for
at least four hours, so that the HCDP pump is at its correct operating temperature.
You must check and adjust the nitrogen pressure when you first use the iH system.
Thereafter, we recommend that you regularly check and adjust the nitrogen pressure, to
ensure optimum shaft-seals performance and to maximise the life of the shaft-seals.
When you need to adjust the nitrogen pressure:
• Turn the pressure regulator clockwise to increase the pressure.
• Turn the pressure regulator anticlockwise to decrease the pressure.
Use the following procedure to check and adjust the nitrogen pressure:
1. Use the Setup/Inlet Purge menu to turn off inlet-purge.
2. Use the Setup/Gas ballast menu to turn on gas-ballast.
3. Refer to Figure 1-7. If the pressure low LED (6) and the pressure high LED (5) are both on and
the pressure warningLED (3) is off, the nitrogen pressure is correct, otherwise continue at
Step 4.
4. Pull up the top of the pressure regulator (4) to unlock it.
5. Adjust the pressure regulator (4) until the pressure high and pressure low LEDs (5, 6) are
both on and the pressure warningLED (3) is off. Alternatively, use the Status/SS purge
menu to display the nitrogen flow, and adjust the pressure regulator (4) until a pressure of
6.0 psi is displayed.
6. Push down the top of the pressure regulator (4) to lock it.
5.8 Monitor the status of the iH system
Notes:
If you have selected the Status menu and then do not press any button for five minutes, the display
will change to the Normal display: refer to Section 5.4.
If a sensor is not fitted, the corresponding display line will show 'NP' (not present).
Use the Status menu or the Setup/Service/View Status menu to display sensor readings and
the values of internal clocks and counters. The information that can be displayed (up to two
items of information at a time) is shown in Table 5-2.
iH Dry Pumping Systems 5-7