Navien NCB-180, Service Manual

Page: 127 / 149

124 NCB Service Manual Version 1.0
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 9).
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. Place the front panel back onto the unit and secure it by
using the 4 screws.
12. 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.
6.2.6 APS
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 air pressure sensor wiring connector (Figure
11).
Figure 11