Watts AERCO Benchmark OMM-0136 Operation And Service Manual page 41

Benchmark Platinum-Edge [II]: Operation-Service Manual
SECTION 4 – INITIAL START-UP
NATURAL GAS Manual Combustion Calibration Instructions
PRE-SET CALIBRATION CONTROLS
PRESET CALIBRATION POINTS METHOD
Figure 4-6: 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
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 manifold gas pressure, on the downstream side of the SSOV, is within the
required range shown in Table 4-1. 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 4-1: REFERENCE Manifold Gas Pressure Range @ 100% Fire Rate
Model
BMK750
BMK1000
BMK1500
BMK2000
BMK2500
BMK3000
BMK4000
BMK5000
BMK5000
(Low Gas Pressure)
BMK6000
BMK6000
(Low Gas Pressure)
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.
OMM-0137_E • GF-211 •
12/13/2019
Single Fuel
2.0" ± 0.2" W.C. (0.50 ± 0.05 kPa)
2.4" ± 0.4" W.C. (0.60 ± 0.10 kPa)
3.6" ± 0.1" W.C. (0.90 ± 0.02 kPa)
3.4" ± 0.2" W.C. (0.85 ± 0.05 kPa)
2.0" ± 0.1" W.C. (0.50 ± 0.02 kPa)
2.1" ± 0.2" W.C. (0.52 ± 0.05 kPa)
3.0" ± 0.2" W.C. (0.75 ± 0.05 kPa)
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
FINE VALVE POSITION CONTROLS
FINE VP STEP METHOD
Dual Fuel
-
-
3.6" ± 0.1" W.C. (0.90 ± 0.02 kPa)
6.3" ± 0.1" W.C. (1.57 ± 0.02 kPa)
5.8" ± 0.1" W.C. (1.44 ± 0.02 kPa)
6.0" ± 0.2" W.C. (1.49 ± 0.05 kPa)
N/A
6.3" ± 0.2" W.C. (1.56 ± 0.05 kPa)
-
7.9" ± 0.2" W.C. (1.97 ± 0.05 kPa)
-
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