12. Reinstall the top panel.
13. Restore the gas supply by opening the gas control valve and reconnect the electrical power.
14. When the boiler is running, use an approved leak detection solution to soap test all joints.
15. Perform a combustion test (see instructions below).
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
(
(Status) > 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
in
Figure: Gas
Valve and Fan
.
The High Fire (gas-air) ratio adjustment screw on the gas valve has also been factory set. See
in
Figure: Gas
Valve and Fan
. 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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