Benchmark 5000-6000 Boiler Installation & Startup Manual
SECTION 4:
INITIAL START-UP
OMM-0123_E
• GF-207 • 12/17/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page
56
of
95
PROPANE Combustion Calibration Instructions
16.
Press the Down▼ arrow key until
SET Valve Position
appears on the display, then press
CHANGE
.
17.
Press the Up ▲ arrow key until the
SET Valve Position
reads
100%
, then press
ENTER
.
18. With the valve position at 100%, insert the combustion analyzer probe into the exhaust
manifold probe opening (see Figure 4-2 in Section 4.2.3) and allow enough time for the
combustion analyzer reading to stabilize.
19.
Compare the combustion analyzer’s oxygen readings to the O
2
Sensor value displayed in
the
Operating
menu on the C-More Controller. The offset value in the
Calibration
menu can
be adjusted by
±3%
to make the on-board O
2
sensor match the value from the combustion
analyzer. If the values differ by more than
±3%
and your combustion analyzer is correctly
calibrated, the on-board O
2
sensor may be defective and need to be replaced
20. Compare the measured oxygen level to the oxygen range shown in Table 4-5. Also, ensure
that the nitrogen oxide (NO
x
) and carbon monoxide (CO) readings do not exceed the
values shown in Table 4-5. If yo
u are not in a “NO
x
-
limited” area and/or do not have a NO
x
measurement in your analyzer, set the oxygen (O
2
) at
5.5% ± 0.5%
.
TABLE 4-5: PROPANE Calibration Reading at 100% Valve Position
Model
Oxygen (O
2
) %
Nitrogen Oxide
(NO
x
)
Carbon Monoxide
(CO)
Single-Fuel
Dual-Fuel
5000
5.5% ± 0.5%
5.5% ± 0.5%
≤100 ppm
<100 ppm
6000
5.0% ± 0.5%
5.0% ± 0.5%
≤100 ppm
<100 ppm
21.
Next, press the Down ▼ arrow key until
CAL Voltage 100%
is displayed.
22. Press the
CHANGE
key and observe that
CAL Voltage 100%
is flashing.
23. The oxygen level at the 100% valve position should be as shown in Table 4-5. Also, ensure
that the NO
x
and CO readings do not exceed the values shown in Table 4-5.
24.
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. Pressin
g the Up ▲ arrow key increases the oxygen level and pressing the down
▼ arrow key decreases the oxygen level.
25. Once the oxygen level is within the specified range at 100%, press the
ENTER
key to store
the selected blower output voltage for the 100% valve position. Record all readings on the
Combustion Calibration Sheets provided.
26. With the valve position at 100%, if the oxygen level is not within the required tolerance after
adjusting the blower voltage, then the gas pressure on the downstream side of the SSOV
must be adjusted using the gas pressure adjustment screw on the SSOV (Figure 4-3).
Slowly rotate the gas pressure adjustment in 1/4-turn increments,
clockwise
to
reduce O
2
level
or
counterclockwise
to
increase
it. Allow the combustion analyzer to stabilize
following each adjustment.
27. Once the oxygen level is within the specified range at 100%, record the O
2
, NO
x
and CO
readings on the Combustion Calibration Data Sheets provided with the unit.
28. Lower the valve position to
70%
using the ▼arrow key.
