AERCO KC Series Equipped with C-More version 3.04 - Manual (Page 37)

INITIAL START-UP
4-7
NOTE:
The combustion calibration data in Tables 1, 2 and 3 apply to both natural gas and propane units.
Therefore, refer to these Tables when performing propane combustion calibration.
For propane, combustion calibration data will be checked at 30%, 16% and 100%. Note that the data In
Table 2 is applicable to a valve position of 16% for propane and 13% for natural gas.
5. While performing the combustion calibration procedure in paragraph 4.3, measure the pressure drop
across the air/propane mixing orifice using the 0-8” W.C. manometer.
6. This reading should remain a constant 3.8” to 4” W.C. throughout the operating range.
7. If the pressure drop is not within this range, remove the cap from the air pressure regulator.
8. Using a flat-tip screwdriver adjust the regulator until 3.8”-4.0” W.C. is obtained. Clockwise will increase
the reading and counter-clockwise will decrease the reading.
9. If adjustments are made to this regulator it will be necessary to recheck oxygen settings at 16%, 30%,
and 100% valve positions.
NOTE:
After an adjustment is made to the air regulator, the cap must be put back on securely to obtain an
accurate reading.
Figure 4.5
Propane Air Differential Pressure Taps
4.5 UNIT REASSEMBLY
Once combustion calibration is set properly, the unit can be re-assembled for permanent operation.
1. Set the ON/OFF switch to the OFF position. Disconnect the AC power supply from the unit.
2. Shut off the gas supply to the unit.
3. Remove the differential pressure regulator cap and cap gasket (see Figure 4.3).
4. Apply a drop of silicone to the regulator adjusting screw to lock its setting.
5. Reinstall the regulator cap and gasket on the regulator. Tighten the cap using a screwdriver or
wrench.
6. Remove all of the manometers and barbed fittings and reinstall the pipe plugs using a suitable thread
compound.