AERCO BMK 6000 Dual Fuel - Manual (Page 213)

Benchmark 6000 DF Installation, Operation & Maintenance Manual
APPENDIX N – ULTRA-LOW NOX CALIBRATION
OMM-0096_0B AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 213 of 219
GF-141
Ph.: 800-526-0288
03/21/2014
APPENDIX N – ULTRA-LOW NOx CALIBRATION
N-1. ULTRA-LOW NOx COMBUSTION CALIBRATION
The procedures provided in this Appendix are used to combustion calibrate the boiler to
produce ultra-low NOx emissions of less than 9 ppm when running on natural gas.
If the ultra-low NOx requirement was specified on the Sales Order, the Benchmark Boiler was
combustion calibrated at the factory prior to shipping. However, recalibration as part of initial
start-up is necessary due to changes in the local altitude, gas BTU content, gas supply piping
and supply regulators. Factory Test Data sheets are shipped with each unit. These sheets must
be filled out and returned to AERCO for proper Warranty Validation.
Prior to performing the procedure in this Appendix, the boiler must be set up as described in
Chapter 4, section 4.1 through the low NOx combustion calibration in section 4.4. Once that is
complete, perform the following steps to combustion calibrate the boiler to the ultra-low NOx
requirement of less than 9 ppm.
IT IS IMPORTANT TO PERFORM THE FOLLOWING PROCEDURE AS OUTLINED BELOW. THIS
WILL KEEP READJUSTMENTS TO A MINIMUM AND PROVIDE OPTIMUM PERFORMANCE
.
Ultra-Low NOx Natural Gas Combustion Calibration
1. Open the water supply and return valves to the unit and ensure that the system pumps
are running.
2. Open the natural gas supply valve(s) to the unit.
3. Set the control panel ON/OFF switch to the OFF position
4. Turn on external ac power to the unit. The display will show loss of power and the time and date.
5. Set the unit to the manual mode by pressing the AUTO/MAN KEY. A flashing manual valve
position message will be displayed with the present position in % . Also, the Manual led will
light.
6. Adjust the air/fuel valve position to 0% by pressing the
▼ arrow key.
7. Ensure that the leak detection ball valve downstream of the SSOV is open.
8. Set the ON/OFF switch to the ON position.
9. Change the valve position to 30%
using the ▲ arrow key. The unit should begin its start
sequence and fire.
10. Next, verify that the gas pressure downstream of the SSOV is set to the range of 2.0 ±
0.4” W.C. If gas pressure adjustment is required, remove the brass hex nut on the
SSOV actuator to access the gas pressure adjustment screw (Figure L-1). Make gas
pressure adjustments using a flat-tip screwdriver to obtain a gas pressure within the
range of 2.0 ± 0.4” W.C.