TM 10-3510-226-23
0070 00
REPLACE
Replace the Exhaust Gas Sensor
1. Shut boiler off at circuit breaker No. 22.
WARNING
Ensure that all electrical power is shut off and disconnected before proceeding. The
circuit breaker box or individual circuit breaker should be locked and tagged out by
personnel following this procedure. Remember that the CBL is a wet environment.
Serious injury or death to personnel can result from electrocution if proper safety
precautions are not observed.
WARNING
Allow the boiler and any associated hot water pipe, tubing or fixtures to cool at least 30
minutes before attempting any repairs. Failure to observe safety precautions may result
in serious injury or death to personnel.
2. Remove cover from exhaust gas sensor (Figure 2, Item 1).
3. Loosen compression nut and disconnect copper tubing (Figure 2, Item 3) from exhaust gas sensor
(Figure 2, Item 1).
4. Tag and disconnect wiring from exhaust gas sensor (Figure 2, Item 1).
5. Remove conduit (Figure 2, Item 4).
6. Remove screws retaining exhaust gas sensor (Figure 2, Item 1) to boiler and remove exhaust gas
sensor.
7. Install replacement exhaust gas sensor (Figure 2, Item 1), and retain with screws.
8. Connect copper tubing (Figure 2, Item 3) to replacement exhaust gas sensor and secure with
compression nut.
9. Remove cover from replacement exhaust gas sensor (Figure 2, Item 1).
10. Install conduit (Figure 2, Item 4) onto replacement exhaust gas sensor (Figure 2, Item 1).
11. Connect wiring to replacement exhaust gas sensor (Figure 2, Item 1) as tagged.
12. Install cover.
13. Switch circuit breaker No. 22 on, and operate boiler IAW TM 10-3510-226-10. Monitor for normal
operation.
0070 00-3
