Navien NHB-055, Service Manual

Page: 129 / 147

NHB Service Manual 129 Version 1.0
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
below.
Figure 16
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 .
10. Turn on water supply, power supply, and gas supply to the
unit.
NOTE
Always use new factory gaskets included with the flame rod
when replacing the part onto the burner assembly.
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. Disconnect the wiring connector from the Ignition
Transformer.
Figure 17
6. Remove the 2 screws from the Igniter Transformer.
Figure 18
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.
NOTE
Verify that the Ignition Transformer insulated cables are firmly
connected to the flame rod.