OMM-0153_E
• 5/11/2023 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 55 of 124
CENTURION Installation, Operation & Maintenance Manual
SECTION 6: SAFETY DEVICE TESTING
6.3 High Gas Pressure Test
To simulate a high gas pressure fault, refer to Figure 6-4 and perform the following steps:
1. Close the 1/4" ball valve located at the High Gas Pressure switch.
2. Remove 1/4" NPT plug from the ball valve (Figure 6-4).
3. Install a
0-
16” W.C. (0–4 kPa)
manometer or gauge where the 1/4" plug was removed.
4. Slowly open the leak detection ball valve.
5. Go to
Main Menu
→
Diagnostics
→
Manual Run
and enable
Manual Mode
control.
6. Set the valve position
between 25% and 30%
using the
+
(Plus) and
–
(Minus) controls.
7. With unit running, monitor gas pressure on the manometer. Record pressure reading.
8. Slowly increase the gas pressure using the adjustment screw on the SSOV
while
counting the number of turns you make
.
9. The
FAULT
indicator should start flashing and the unit should shut down and display a
Fault Lockout -
Gas Pressure
Fault
message at approximately the value shown in
Table 6.3 (the High Gas Pressure switch setting). If the unit does not trip off within 0.2”
W.C. of the pressure shown, the switch needs to be replaced.
HIGH Natural
Gas Pressure, ± 0.2” W.C. (± 50 Pa)
Model
Natural Gas
CEN 2000/1600 FM & DBB Single-Fuel
2.4” W.C. (0.6 KPa)
HIGH Propane
Pressure, ± 0.2” W.C. (± 50 Pa
)
Model
Natural Gas
CEN 2000/1600 FM & DBB Single-Fuel
2.85
” W.C. (0.
71 KPa)
10. Reduce the gas pressure by returning the SSOV adjustment screw to its original position
(the value recorded in step 8). This pressure should be within the range used during
combustion calibration, shown in the table above.
11. Unscrew and remove the plastic cover on the High Gas Pressure Switch and press the
red reset button. Replace cover.
12. Press the
CLEAR
button on the Edge Controller to clear the fault.
13. The fault message should clear, the
FAULT
indicator should go off and the unit should
restart (if in
Manual
mode).
14. Upon test completion, close the ball valve and remove the manometer. Replace the 1/4"
NPT plug removed in step 2.
Figure 6-3: High Gas Pressure Switch
