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Benchmark 5000-6000 Boiler Installation & Startup Manual
SECTION 4: INITIAL START-UP
NATURAL GAS Combustion Calibration Instructions
8. Ensure that the leak detection ball valve downstream of the SSOV is open and the
manometer is attached and functioning properly.
9. Set the ON/OFF switch to the ON position.
10. Press the MENU key on the front panel of the C-More until COMBUSTION CAL MENU
appears on the display.
11. Press the Up ▲ arrow key until SET Stdby V Out (Standby Voltage) setting appears.
Verify that it is set to 2.0 V (the default). AERCO recommends it be kept at 2.0 volts to
prevent flue gas recirculation. Individually vented units in positive pressure boiler rooms
may set SET Stdby V Out to 0 volts.
12. Press the Down ▼ arrow key until SET Valve Position appears, then press CHANGE.
13. Use the Up ▲ arrow key to change the valve position to 50%. The unit should begin its
start sequence and fire.
14. Next, verify that the manifold gas pressure, downstream of the SSOV, is within the range in
Table 4-1, for the model you are calibrating. If gas pressure adjustment is required, remove
the brass hex nut on the SSOV actuator to access the gas pressure adjustment screw
(Figure 4-3). Make gas pressure adjustments using a flat-tip screwdriver to obtain a gas
pressure in the range specified in Table 4-1.
TABLE 4-1: NATURAL GAS
Model
5000
5000
Low Gas Pressure
6000
6000
Low Gas Pressure
15. Once the manifold gas pressure is within the range in Table 4-1, record this value; it will be
used later, in Section 5.2: Low Pressure Gas Test, and Section 5.3: High Pressure Gas
Test.
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) and allow enough time for the combustion
analyzer reading to stabilize.
19. Compare the combustion analyzer's oxygen readings to the O
the Operating menu on the C-More Controller. If the values differ by more than ±1.5% and
your combustion analyzer is correctly calibrated, the on-board O
and need to be replaced.
OMM-0123_E • GF-207 • 12/17/2019
Manifold Gas Pressure Range @ 100% Fire Rate
Single-Fuel
6.3" ± 0.2" W.C. (1.56 ± 0.05 kPa)
2.6" ± 0.2" W.C. (0.65 ± 0.02 kPa)
7.9" ± 0.2" W.C. (1.97 ± 0.05 kPa)
1.9" ± 0.2" W.C. (0.50 ± 0.05 kPa)
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Dual-Fuel
6.3" ± 0.2" W.C. (1.56 ± 0.05 kPa)
7.9" ± 0.2" W.C. (1.97 ± 0.05 kPa)
Sensor value displayed in
2
sensor may be defective
2
Page 52 of 95
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