IBC SFC 99 Quick Start Manual page 4

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 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
/
SFC 15-99 SFB 15-99
Table 3 - Rated input of a converted appliance
Normal ignition system sequence of operation:
The appliance's control, upon a call for heat or DHW, turns on the combustion fan for a 5-second pre-purge, then
energizes the spark electrode and gas valve for a 5-second trial for ignition.
If the burner does not light, the process is repeated until the burner lights and flame is detected. After 4
unsuccessful trials for ignition, the appliance locks out and will need to be manually reset by pressing the Return
Arrow button.
To perform a combustion test and adjustment:
1. Turn off the appliance's manual gas valve.
2. With a Torx 15 screwdriver, open the inlet gas supply pressure test port by
turning its screw 1 full turn counterclockwise.
3. Attach a manometer to the inlet pressure test port and turn on gas to
appliance.
Static manometer reading should be ideally 1 1" w.c. for Propane.
Minimum and maximum static pressure must be between 5" and 14"
w.c. Monitor pressure throughout the commissioning (start-up)
procedure. Pressure may droop up to 1" w.c. at high fire.
4. To set the appliance to high fire manually, create a large DHW demand f or the appliance to heat.:
Allow the appliance to ignite / run against a large load, to maintain high fire. To set the high-fire manually,
press and hold the Service icon for two seconds. Then while holding the Service icon press the Plus b utton
twice. "H" will show in the service display as the appliance enters high fire.
4 |
High Fire Input
99 MBH