Watts AERCO Benchmark BMK5000 - Page 58

Benchmark with Edge [I]: Operation-Maintenance Manual
SECTION 4 – INITIAL START-UP
OMM-0145_D • GF-218 • 11/2/2020 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 58 of 213
NATURAL GAS Manual Combustion Calibration Instructions
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 Natural Gas Manifold Gas Pressure Range @ 100%
Fire Rate
Model
Single Fuel
Dual Fuel *
BMK750
2.0” ± 0.2” W.C. (0.50 ± 0.05 kPa)
-
BMK1000
2.4” ± 0.4” W.C. (0.60 ± 0.10 kPa)
-
BMK1500
3.6” ± 0.1” W.C. (0.90 ± 0.02 kPa)
3.6” ± 0.1” W.C. (0.90 ± 0.02 kPa)
BMK2000
3.4” ± 0.2” W.C. (0.85 ± 0.05 kPa)
6.3” ± 0.1” W.C. (1.57 ± 0.02 kPa)
BMK2500
2.0” ± 0.1” W.C. (0.50 ± 0.02 kPa)
5.8” ± 0.1” W.C. (1.44 ± 0.02 kPa)
BMK3000
2.1” ± 0.2” W.C. (0.52 ± 0.05 kPa)
6.0” ± 0.2” W.C. (1.49 ± 0.05 kPa)
BMK4000
3.0” ± 0.2” W.C. (0.75 ± 0.05 kPa)
4.9” ± 0.2” W.C. (1.22 ± 0.05 kPa
BMK5000N
1.8” ± 0.2” W.C. (0.45 ± 0.05 kPa)
4.9” ± 0.2” W.C. (1.22 ± 0.05 kPa
BMK5000
6.3” ± 0.2” W.C. (1.56 ± 0.05 kPa)
6.3” ± 0.2” W.C. (1.56 ± 0.05 kPa)
BMK5000
(Low Gas Pressure)
2.6” ± 0.1” W.C. (0.65 ± 0.02 kPa)
-
BMK6000
7.9” ± 0.2” W.C. (1.97 ± 0.05 kPa)
7.9” ± 0.2” W.C. (1.97 ± 0.05 kPa)
BMK6000
(Low Gas Pressure)
1.9” ± 0.2” W.C. (0.50 ± 0.05 kPa)
-
* This column lists natural gas pressures on dual fuel units. For propane values, see Section 4.5.2.
PRE-SET CALIBRATION STEPS
FINE VALVE POSITION CONTROLS