Adjusting The Gas Valve (Ex 400, Ex 500) - IBC EX Series Installation & Operating Manual

5. Switch on the gas supply to measure the inlet gas pressure. The gas pressure for
natural gas should be around 7" wc at high fire and 11" wc for propane. If the gas
pressure dips below 3½" wc or exceeds 15" wc, the boiler will shut down. If this
occurs, you will need to reset the gas high or low pressure switch. For instructions,
see Resetting the gas high / low pressure switches on page
6. After completing the inlet gas pressure test, switch off the gas supply.
Remove the inlet gas pressure test fitting and manometer from the inlet gas pressure
7.
test port.
Insert the bolt head and tighten using a 3 mm Allen wrench.
8.

6.3.4 Adjusting the gas valve (EX 400, EX 500)

Danger
Making adjustments to the IBC gas valve without a properly calibrated gas
combustion analyzer and by persons who are not trained and experienced in its use is
forbidden. Failure to use an analyzer can result in an immediate hazard.
To help with the following procedure, see
Performing a combustion test
1. Give the boiler a call for heat.
2. When the boiler reaches high fire, insert the combustion analyzer test probe into the flue
gas test port. Then verify that the
Table 11 values.
Figure 48 Flue gas test port
Figure 42 .
CO2 reading is within the combustion test targets at
74
Section: Boiler operation
77.