AERCO BMK 6000 Dual Fuel - Manual (Page 70)

Benchmark 6000 DF Installation, Operation & Maintenance Manual
CHAPTER 4 – INITIAL START-UP
Page 70 of 219 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0096_0B
03/21/2014
Ph.: 800-526-0288
GF-141
PROPANE Gas Combustion Calibration – Continued
NOTE
If NOx readings exceed the target values shown (<20 ppm),
increase the O
2
level up to 1% higher than the listed calibration
range shown in the table. Record the increased O
2
value on the
Combustion Calibration sheet.
Combustion Calibration Readings
Valve Position Oxygen (O
2
) % Nitrogen Oxide (NOx) Carbon Monoxide (CO)
65% 5.5% ± 0.5 <100 ppm <150 ppm
45% 5.5% ± 0.5 <100 ppm <100 ppm
30% 5.5% ± 0.5 <100 ppm <100 ppm
18% 6.0% ± 0.5 <100 ppm <100 ppm
28. If the oxygen level at the 18% valve position is too high and the Blower voltage is at the
minimum value, you can adjust the idle screw (TAC valve) which is recessed in the top of
the Air/Fuel Valve (see Figure 4-4, above). Rotate the screw 1/2 turn clockwise (CW) to
add fuel and reduce the O
2
to the specified level. Recalibration MUST be performed again
from 45% down to 18% after making a change to the idle screw (TAC valve).
29. This completes the Propane gas combustion calibration procedures.
4.6 DUAL-FUEL SWITCHOVER INSTRUCTIONS
4.6.1 Switchover from NATURAL GAS to PROPANE
To switch from Natural Gas to Propane Gas operation, proceed as follows:
Switchover from NATURAL GAS to PROPANE
1. Set the ON/OFF switch on the C-More Controller to the OFF position.
2. Close the external Natural Gas supply valves.
3. Open the external Propane Gas supply valves.
4. Refer to Figure 4-6 and locate the Fuel Selector Switch on the unit, behind the front door.
5. Set the Fuel Selector Switch to the PROPANE position. A Gas pressure Fault message will
be displayed on the Control Box.
6. Clear the Gas Pressure Fault by pressing the CLEAR key.
7. Set the ON/OFF switch on the C-More /control Box to the ON position.
8. Press the MENU key once. Setup Menu will be displayed.
9.
Press the ▲ arrow key once. Password will be displayed.