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Benchmark with Edge [I]: Operation-Maintenance Manual
SECTION 4
– INITIAL START-UP
OMM-0145_A99
• GF-218 • 9/18/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page
62
of
157
PROPANE Combustion Calibration Instructions
7. Verify that the incoming gas pressure to the unit is within the allowable range (see the
Benchmark Gas Supply Design Guide
(TAG-0047, GF-2030).
9. Once you have completed the previous step, move the manometer (or use a secondary
one) to the
downstream
side of the SSOV and press
Next
to continue.
10. For the NOx requirement choose
None
.
Figure 4-8: Choose NOx Requirement
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).
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). Adjust 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.
PRE-SET CALIBRATION CONTROLS
VALVE POSITION CONTROLS