Adjusting The Gas Valve - IBC SL Series Installation & Operating Manual

6. To detach the Venturi mixing device from the fan, remove the three bolts (noting the
location of the bolts).
7. Ensure that the fan O-ring is not damaged, and is seated in the groove.
Installing the new Venturi mixing device
1. Attach the new Venturi mixing device to the fan with the three bolts.
2. When securing the gas valve to the new Venturi mixing device with the four bolts, ensure
that the O-ring is installed.
Caution
Failure to position the O-ring as indicated will result in a gas leak.
3. Place conversion labels associated with the new fuel onto the boiler.
4. Check for gas leaks.
5. Tune the gas valve (see

6.3.3 Adjusting the gas valve

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 view illustrations of the gas valve and its components, see
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 off the gas supply. You will be measuring the inlet gas supply from the test port. 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.
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" w.c. at high fire and 11" w.c. for
propane.
6. After completing the inlet gas pressure test, switch off the gas supply.
Adjusting the gas valve on page
69
6.3.3 Adjusting the gas valve
69).
Figure 41 and Figure 42 .