Watts AERCO Benchmark OMM-0136 - Page 47

Benchmark Platinum-Edge [II]: Operation-Service Manual
SECTION 4 – INITIAL START-UP
OMM-0137_E • GF-211 • 12/13/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 47 of 153
PROPANE Combustion Calibration Instructions
PRESET CALIBRATION POINTS METHOD FINE VP STEP METHOD
Figure 4-9: Manual Combustion Calibration Screens
12. Set the Controller’s Enable/Disable switch to Enable.
13. Change the valve position to 30%, press the Go button, then verify that the unit has ignited
successfully and is operating as expected.
14. Use the  (Right) arrow key to change the valve position to 100%, then press Go.
15. Verify that the gas pressure on the downstream side of the SSOV is within the required
range shown in Table 4-4. If it isn’t, remove the brass hex nut on the SSOV actuator to
access the gas pressure adjustment screw (Figure 4-3). Make adjustments using a flat-tip
screwdriver, slowly rotating the gas pressure adjustment (in 1/4-turn increments)
clockwise to increase gas pressure or counterclockwise to reduce it. The resulting gas
pressure reading on the downstream manometer should fall in the range listed below.
TABLE 4-4: PROPANE Gas Pressure Range @ 100% Fire Rate
Model
Nominal Gas Pressure
BMK750P
3.9” W.C. ± 0.2” W.C. (0.97 kPa ± 0.05 kPa)
BMK1000P
7.6” W.C. ± 0.2” W.C. (1.89 kPa ± 0.05 kPa)
1500DF & 1500P
1.4” W.C. ± 0.1” W.C. (0.35 kPa ± 0.02 kPa)
2000DF & 2000P
2.5” W.C. ± 0.1” W.C. (0.62 kPa ± 0.02 kPa)
2500DF & 2500P
2.0” W.C. ± 0.1” W.C. (0.50 kPa ± 0.02 kPa)
3000DF & 3000P
1.6” W.C. ± 0.1” W.C. (0.40 kPa ± 0.02 kPa)
5000DF & 5000P
2.0” ± 0.2” W.C. (0.50 to 0.05 kPa)
6000DF & 6000P
4.2” ± 0.2” W.C. (1.05 to 0.05 kPa)
16. With the valve position still at 100%, insert the combustion analyzer probe into the exhaust
manifold probe opening (see Figure 4-2a – 4-2c in Section 4.2.3) and allow enough time
for the combustion analyzer reading to stabilize
17. Compare the combustion analyzer’s oxygen (O
2
) reading to the O
2
value in the Reading
column (Figure 4-9). If they differ, go to the Main Menu → Calibration → Input/Output →
O2 Sensor screen and adjust the O2 Offset parameter, up to ±3%, to make the on-board
O
2
sensor match the value from the combustion analyzer. If your combustion analyzer is
correctly calibrated, and the on-board O
2
sensor cannot be made to match the analyzer,
the sensor may be defective and need to be replaced.
PRE-SET CALIBRATION CONTROLS
VALVE POSITION CONTROLS