Caution
Failure to position the O-ring as indicated will result in a gas leak, and affect burner operation.
8. Re-assemble in the reverse order of steps provided.
9. Check for gas leaks.
Combustion testing and adjustment
Danger
A combustion test checks that the gas valve is operating properly in the field. To perform a combustion test, you
must be a qualified, trained and licensed gas fitter.
Making adjustments to the IBC gas valve without a properly calibrated gas combustion analyzer and by people
who are not trained and experienced in its use is forbidden. Failure to use an analyzer can result in an
immediate hazard.
Model Number
High Fire Input
EX 700
700 MBH
Table 1
Rated input of a converted boiler
Normal ignition system sequence of operation:
The boiler control, upon a call for heat or DHW, turns on the combustion fan for a 20-second pre-purge, then energizes the
spark electrode and gas valve for a 4-second trial for ignition.
If the burner does not light, the process is repeated until the burner lights and flame is detected. After 3 trials for ignition, the
boiler locks out and will need to be manually reset by clearing the error on the touchscreen controller (Diagnostics >
Advanced Diagnostics > Clear Errors). The boiler automatically resets after 60 minutes, if no action is taken.
Combustion test target ranges
The Low Fire (zero-offset) valve adjustment screw on the gas valve has been factory set. See
The High Fire (gas-air) ratio adjustment screw on the gas valve has also been factory set. See
. It will have
to be adjusted to attain optimum combustion results whenever fuel conversion is undertaken; however, no mixture
adjustment shall be performed unless done by a qualified technician using properly functioning and calibrated combustion
analyzing equipment.
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