Centurion Water Heater- Edge [ii]: Install-Operation-Service
SECTION 7: MAINTENANCE
OMM-0153_A
• 8/25/2022 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 68 of 131
7.3 FLAME DETECTOR
The CENTURION Flame Detector (kit P/N
24356-1
) is located on the burner plate at the top of
the unit (see Figure 7-1). The flame detector should be inspected every 12 months and replaced
every 24 months, or sooner if damaged or warped. Note, it may be hot; allow the unit to cool
sufficiently before removing the flame detector.
This part and instructions are included in the CEN2000 12 Month (P/N
58025-25
) and 24 Month
(P/N
58025-26
and
58023-27
) Maintenance Kits. Be sure to use the current model flame
detector, included in the maintenance kit; some older flame detectors are shaped differently and
may not function properly.
7.4 O
2
SENSOR MAINTENANCE
The Lean Oxygen Sensor (P/N
61026C
) should be cleaned and inspected every 12 months. It is
not included in any of the 12- or 24-month maintenance kits. It is located on the burner plate at
the top of the unit. It may be hot, so allow unit to cool sufficiently before removing or replacing it.
Figure 7-3: O
2
Sensor Mounting Location
Lean O
2
Sensor Maintenance
1. Set the Enable/Disable switch on the Edge Controller to
Disabled
.
2. Remove the top enclosure cover from the unit.
3. Disconnect O
2
sensor lead wire by pushing the release tab and pulling connector apart.
4. Next, loosen and remove the O
2
sensor and crush washer from the burner plate using a
15/16" open-end wrench.
5. Thoroughly inspect the O
2
sensor. If eroded, the sensor should be replaced. Otherwise
clean the sensor with a fine emery cloth.
NOTE:
It is recommended to perform O
2
Sensor calibration before replacing the O
2
Sensor.
Go to
Calibration
→
Input/Output
→
O2 Sensor
).
6. Reinstall the O
2
sensor and crush washer on the burner plate.
7. Reconnect the sensor lead wire.
8. Reinstall the top enclosure cover on the unit.
O
2
SENSOR
