base
A
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IOM74 November 2020 R105
HE BURNER 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.
MAXITROL VALVE
Power the base and enable the fan switch.
Connect computer to base.
Set airflow as required. Confirm profile pressure drop is within proper range. If using a Belimo gas valve
actuator, perform the Ball Valve Actuator Calibration first.
Select the HE setup tab.
Enable the heat switch.
Follow the combustion setup sequence noted in appendix F.
Press Service Mode, set Service Override to 100%. The burner will initiate the ignition sequence.
Adjust the service regulator to achieve design manifold pressure. Clock the gas flow and adjust as necessary.
Set Service Override to 4%. Set low fire using the mechanical bypass on the Maxitrol valve. The flame should
be as small as possible while still maintaining a stable flame across the entire burner.
Press Setup Complete.
Return to the home screen and allow the unit to operate independently.
GAS ACTUATOR CALIBRATION
WARNING:
If using a ball valve and actuator for gas it must be pre
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 the gas 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.
Press the UP arrow to enter the actuator calibration screen.
Press: Start Setup, then Closed (0%)
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