Dj/Large Sh(X) Combustion Setup; Gas Actuator Calibration; Combustion Offsets - EngA ENGINEERED AIR base Technical Manual

base

DJ/LARGE SH(X) 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.
NOTICE:
Always allow the heat exchanger temperatures to stabilize before accepting combustion values.

GAS ACTUATOR CALIBRATION

If using a ball valve and actuator for gas, it must be pre-calibrated before attempting to set
WARNING:
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. Enter calibration
screen and perform calibration setup. Return and re-set offset values.
WARNING:
Before performing the calibration procedure, turn Off the appliance gas supply.
Power the base, leave the heat switch and fan switch off.
Switch to the Ball Valve Actuator Calibration Tab.
Press: Start Setup, then Closed (0%)
The fuel actuator will move to a fully closed (90°) position and read 2V. Set the ball valve to fully closed
mechanically and tighten linkage. The feedback must be at or very near 2V. Enter the actual feedback value
into the space provided.
Press in sequence from low to high fire. At each stage enter the feedback value for the gas actuator once
stabilized.
Once complete, press Start Setup to release.

COMBUSTION OFFSETS

Turn on the appliance gas supply.
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.
IOM74
20
A
November 2020 R105