Benchmark 6000 Boiler Installation, Operation & Maintenance Manual
APPENDIX N – ULTRA-LOW NOX CALIBRATION
OMM-0086_0D
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
207
of
210
GF-133
Ph.: 800-526-0288
03/20/14
Ultra-Low NOx Natural Gas Combustion Calibration -
Continued
NOTE
The remaining combustion calibration steps are performed using the
Combustion Cal Menu
included in the C-More Control System. The
combustion calibration control functions will be used to adjust the oxygen
level (%) at valve positions of 80%, 60%, 45%, 30% and 18% as described
in the following steps. These steps assume that the inlet air temperature is
within the range of 50°F to 100°F. If NOx readings exceed the target value
of 9 ppm, increase the O
2
level up to 1% higher than the listed calibration
range. Record the increased O
2
value on the Combustion Calibration
sheet.
17. Lower the valve positio
n to 80% using the ▼arrow key.
18. Press the
MENU
key on the front panel of the C-MORE and access the
Setup
menu.
Enter password
6817
and then press the
ENTER
key.
19. Press the
MENU
key on the front panel of the C-MORE until
Combustion Cal Menu
appears on the display.
20.
Press the ▲ arrow key until
SET Valve Position
appears on the display.
21. Press the
CHANGE
key.
SET Valve Position
will begin to flash.
22.
Press the ▲ arrow key until
SET Valve Position
reads
80%
. Press the
ENTER
key.
23. Next, press the
dow
n (▼) arrow key until
CAL Voltage 80%
is displayed.
24. Press the
CHANGE
key and observe that
CAL Voltage 80%
is flashing.
25. The oxygen level at the 80% valve position should be as shown below. Also, ensure
that the nitrogen oxide (NOx) and carbon monoxide (CO) readings do not exceed the
following values:
Ultra-Low NOx
Combustion Calibration Readings
Valve Position
Oxygen (O
2
) %
Nitrogen Oxide (NOx)
Carbon Monoxide (CO)
80%
5% - 7%
<9 ppm
<100 ppm
26. If the oxygen level is not within the specified range,
adjust the level using the ▲ and ▼
arrow keys. This will adjust the output voltage to the blower motor as indicated on the
display. Pressing the ▲ arrow key increases the oxygen level and pressing the down ▼
arrow key decreases the oxygen level.
27. Once the oxygen level is within the specified range at 80%, press the
ENTER
key to
store the selected blower output voltage for the 80% valve position. Record all readings
on the Combustion Calibration Sheets provided.
28. Repeat steps 20 through 27 for valve positions of 60%, 45%, 30% and 18%* (see
*NOTE below). The oxygen (O
2
), nitrogen oxide (NOx) and carbon monoxide (CO)
should remain within the same limits for all valve positions as shown in the following
table.
*NOTE
Set the Valve Position at 18% but make adjustments to the Combustion
Calibration value designated as 16%.
