Watts AERCO Benchmark BMK750 Operation And Service Manual page 57

Benchmark with Edge [I]: Operation-Maintenance Manual
SECTION 4 – INITIAL START-UP
NATURAL GAS Manual Combustion Calibration Instructions
11. The main Manual Combustion Calibration screen appears. It provides two methods to
ramp the unit's valve position up or down:
•
Method 1: Toggle through the pre-set calibration points till you reach the desired
valve position, then press Go to go to that point (left image below).
•
Method 2: Enable Fine VP Step, then manually press the + or – buttons once per
1% to bring the unit to the desired valve position (right image below).
PRE-SET CALIBRATION STEPS
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 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: Gas Pressure Downstream of SSOV @ 100% Fire Rate
Model
BMK750
BMK1000
BMK1500
BMK2000
BMK2500
BMK3000
BMK4000
BMK5000
BMK5000
(Low Gas Pressure)
BMK6000
BMK6000
(Low Gas Pressure)
OMM-0145_A99 • GF-218 •
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" ± 0.1" W.C. (0.65 ± 0.02 kPa)
7.9" ± 0.2" W.C. (1.97 ± 0.05 kPa)
2.0" ± 0.2" W.C. (0.50 ± 0.05 kPa)
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
9/18/2019
FINE VALVE POSITION CONTROLS
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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