Condensate Trap; Water Pressure Sensor - Navien NHB-055 Service Manual

6.2.8 Condensate Trap

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 pin that secures the condensate drain cap and
then remove the cap. Use a bucket to collect the condensate.
5. Detach the condensate piping from the unit.
6. Remove the 2 screws located at the bottom of the unit that are
attached to the condensate trap.
7. Loosen the clip that secures the hose to the condensate trap,
and then pull off the hose.
8. Remove the old condensation trap and replace it with the new
part.
9. Reconnect the hose to the condensate trap.
10. Reattach the condensation trap to the unit and secure it using
the 5 screws.
11. Replace the controller to its original position.
12. Turn on the water supply, power supply, and gas supply to the
unit.
NOTE
Ensure that the condensate drain trap is completely inserted
into the condensate fitting to eliminate leaking.
Use the pin to secure the cap to the fitting.
132 NHB Service Manual
Figure 27

6.2.9 Water Pressure Sensor

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. Disconnect the water pressure sensor wire housing.
Figure 28
5. Pull out the water pressure sensor.
6. Replace with new water pressure sensor.
7. Connect the water pressure sensor wire housing.
NOTE
Always use proper O-rings at the water pressure valve
connection to ensure tight seals
Version 1.0