![background image](http://html1.mh-extra.com/html/watts/pvi-centurion/pvi-centurion_installation-operation-and-maintenance-manual_3850804055.webp)
Centurion Water Heater- Edge [ii]: Install-Operation-Service
SECTION 6: SAFETY DEVICE TESTING
OMM-0153_A
• 8/25/2022 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 55 of 131
6.2 LOW GAS PRESSURE TEST
To simulate a low gas pressure fault, refer to Figure 6-2 and perform the following steps:
1. Remove the front panel from the Water Heater to access the gas train components.
2. Make sure the 1/4" ball valve located at the inlet side of the SSOV is closed.
3. Remove the 1/4" NPT plug from the ball valve.
4. Install a
0-
16” W.C. (0–4 kPa)
manometer or gauge where the 1/4" plug was removed.
5. Slowly open the 1/4" ball valve.
6. Go to Main Menu
→
Diagnostics
→
Manual Run enable the Manual Mode control
7. Adjust the Air/Fuel Valve position
between 25% and 30%
using the
+
and
–
controls.
8. While the unit is firing, slowly close the external manual gas shut-off valve upstream of
the unit (not shown).
9. The unit should shut down and display
Fault Lockout -
Gas Pressure
Fault
at
approximately the pressure shown below:
LOW Gas Pressure, ± 0.2” W.C. (± 50 Pa)
Model
Natural Gas
CEN2000 FM & DBB Single-Fuel
3.8” W.C. (946 Pa)
10. Close the 1/4" ball valve (opened in Step 5).
11. Fully open the external manual gas shut-off valve (not shown) and press
CLEAR
button.
12. The fault message should clear,
FAULT
indicator go off, and the unit should restart.
13. Upon test completion, close the ball valve, remove the manometer and replace the 1/4"
NPT plug removed in step 3.
Figure 6-2: LOW Gas Pressure Test Components