IBC VX Series Installation & Operating Manual page 70

High Fire Adjustment
Gas valve support bracket
Venturi insert clip
Venturi insert
Figure 42 Gas valve and fan components
6.3.3.1 Measuring the inlet gas pressure
To perform a gas pressure test, you will need to use a Torx 15 screwdriver and a manometer.
1. Shut on the gas supply. You will be measuring the inlet gas supply from the test port (see
Figure 43 ). Do not perform a test from the manifold gas pressure test port.
2. On the gas valve, loosen the inlet gas pressure test port screw counter-clockwise.
Figure 43 Location of inlet gas pressure test port
3. Attach the manometer to the inlet gas pressure test port.
4. To measure the inlet gas pressure, switch on the gas supply.
5. When the boiler is operating at high fire, measure the gas pressure. Ensure that you have
a load configured (reset heating, set point, or DHW). This load should be large enough to
allow the boiler to operate at high fire for over 10 minutes.
The gas pressure for natural gas should be around 7" wc at high fire and 11" wc for
propane.
6. After completing the inlet gas pressure test, switch off the gas supply.
7. Remove the manometer from the inlet gas pressure test port.
8. Tighten inlet gas pressure test port screw.
9. Switch on the gas supply, and return the boiler to normal operation.
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Section: Boiler operation