base
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IOM74 November 2020 R105
DG COMBUSTION SETUP
Combustion setup may only be done using a computer. Refer to the combustion values and setup sheets at the
end of this manual. Refer to the tabs along the top of the service screens to access noted sections.
Always allow the heat exchanger temperature to stabilize before accepting combustion values.
A set of full clocking data must be completed in the factory to generate a database of combustion fuel curves.
GAS AND AIR ACTUATOR CALIBRATION
WARNING:
If using a ball valve and actuator for gas
calibrated before attempting to
set combustion offsets. This is normally completed at initial factory setup but will also need to
be verified if the actuator is replaced.
For field service, record all offset values, and then set all values to zero for both the gas and
air actuators. Enter calibration screen and perform calibration setup. Return and re-set offset
values.
Before performing the calibration procedure, turn Off the appliance gas supply.
Power the base, leave the heat switch and fan switch off. Turn off the gas supply to the appliance.
Switch to the Ball Valve Actuator Calibration Tab.
Press: Start Setup, then Closed (0%)
Both actuators will move to fully closed (90°) position and read 2V. Set the ball valve and combustion air
damper to fully closed mechanically and tighten linkage. The feedbacks must be at or very near 2V. Enter the
actual feedback values into the spaces provided.
Press in sequence from low to high fire. At each stage enter the feedback values for both the gas and air
actuators once stabilized.
Once complete, press Start Setup to release. Turn the gas supply back ON.
COMBUSTION OFFSETS
To continue, enable the fan and heat switch. The technician must ensure that there is adequate air flow
across the heat exchanger.
Select the Combustion Setup tab.
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