Watts Aerco Benchmark Series Operation And Service Manual page 43

Benchmark Platinum-Edge: Operation-Service Manual
SECTION 4 – INITIAL START-UP
PROPANE Combustion Calibration Instructions
10. For the NOx requirement choose None.
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 CONTROLS
PRESET CALIBRATION POINTS 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.
OMM-0137_D • GF-211 • 7/16/2019
Figure 4-8: Choose NOx Requirement
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
VALVE POSITION CONTROLS
FINE VP STEP METHOD
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