Auto Feeder Valve; Dhw Heat Exchanger - Navien NCB-180 Service Manual

6.2.14 Auto Feeder Valve

1. Turn off the gas supply to the unit.
2. Turn off the 120V power supply to the unit.
3. Turn off the water supply to the unit. Drain all water
from the appliance.
4. Remove the siphon
5. Disconnect the wiring connector, fastener and remove
the stainless nut from the Auto feeder valve.
Figure 30
6. Replace with Auto feeder valve.

6.2.15 DHW Heat exchanger

1. Turn off the gas supply to the unit.
2. Turn off the 120V power supply to the unit.
3. Turn off the water supply to the unit. Drain all water
from the appliance.
4. Remove the flow Sensor. (refer to page 127)
5. Remove the Domestic Hot Water Outlet collar.
130 NCB Service Manual
6. Remove the two fasteners at the DHW exchanger.
Figure 31
7. Replace with the new DHW Exchanger.
Figure 32
Version 1.0