Flame Rod; Ignition Transformer - Navien NCB-700-2S+/42K Service Manual

6.2.4 Flame Rod

1. Turn off the gas supply to the unit.
2. Disconnect the unit from the power supply.
3. Turn off the water supply to the unit.
4. Remove the Ignition Transformer insulated cables.
5. Remove the 2 screws from the flame rod as shown in figure
7 below.
6. Remove the flame rod wiring connector.
7. Remove the flame rod from the burner assembly and
replace with the new part.
8. Reconnect the 2 ignition transformer insulated cables to the
new flame rod.
9. Place the new flame rod back onto the burner assembly and
secure it by using the 2 screws from figure 7.
10. Turn on water supply, power supply, and gas supply to the
unit.
Always use new factory gaskets included with the
Note
flame rod when replacing the part onto the burner
assembly.
108 Replacement of Parts
Figure 7
Figure 8

6.2.5 Ignition Transformer

1. Turn off the gas supply to the unit.
2. Disconnect the unit from the power supply.
3. Turn off the water supply to the unit.
4. Remove the Ignition Transformer insulated cables from the
flame rod.
5. Refer to figure 9 and disconnect the wiring connector from
the Ignition Transformer.
Figure 9
6. Remove the 2 screws from the Igniter Transformer.
Figure 10
7. Pull out the Ignition Transformer.
8. Replace the old Ignition Transformer with the new part, and
then use the 2 screws to secure the part.
9. Reconnect the Ignition Transformer insulated cables to the
flame rod.
10. Reattach the wiring connectors from the Ignition
Transformer.
11. Turn on water supply, power supply, and gas supply to the
unit.
Verify that the Ignition Transformer insulated cables
Note
are firmly connected to the flame rod.