Centurion Water Heater- Edge [ii]: Install-Operation-Service
SECTION 5: INITIAL START-UP
OMM-0153_A
• 8/25/2022 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 46 of 131
7. Once you have completed the previous steps, move the manometer (or use a secondary
one) to the
downstream
side of the SSOV and press
Next
to continue.
8. Choose the NOx requirement for this installation:
None
or
<= 20 PPM
.
Figure 5-6: Choose NOx Requirement
9. 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).
Preset Calibration Points Method
Fine VP Step Method
Figure 5-7: Choose NOx Requirement
10.
Set the Controller’s Enable/Disable switch to
Enable
.
11. Change the valve position to 30%, press the
Go
button, then verify that the unit has
ignited and is operating as expected.
12. Use the
(Right) arrow key to change the valve position to
100%
, then press
Go
.
13. Verify the manifold gas pressure on
downstream
side of the SSOV is within required
range shown below. If it isn’t, remove the brass hex nut on the SSOV actuator to access
the gas pressure adjustment screw (Figure 5.4). Using a flat-tip screwdriver, slowly
rotate 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.
Manifold Gas Pressure @ 100% Fire Rate
Model
Natural Gas
CEN2000
1.6” ± 0.1” W.C. (0.40 ± 0.02 kPa)
