Navien CH-180 Service manual - page 140

©Navien America Inc. 2010

CH  series service Manual

Version 1.0

8.2.19. Domestic Hot Water Outlet Collar

1. Turn off the gas supply.

2. Turn off the 120V power supply. 

3. Turn off the water supply. Drain all 

    water from the appliance.

4. Remove the four screws securing 

    the front panel. Remove front panel.

5. Pull out the PCB. (refer to 8.2.1 

    PCB)

6. Pull out the flow sensor. (refer to 

    8.2.12 Flow Sensor.)

7. Remove the stainless clip. (fastener 

    “A”)

8. Loosen the domestic hot water outlet 

    adaptor 2 screw from bottom base. 

9. Pull out the domestic hot water outlet 

    collar. 

10. Replace with new domestic hot 

      water outlet collar secured it.

11. Tighten the domestic hot water 

      outlet adaptor 2 screw from bottom 

      base.

12. Replace the stainless clip. (fastener 

      “A”)

13. Replace the flow sensor. (refer to 

      8.2.12 Flow Sensor)

14. Replace the PCB. (refer to 8.2.1 

      PCB)

16. Install front panel using 4(four) 

      screws.

17. Turn on water supply, power 

      supply, and gas supply.

18. Open a hot water tap and ensure 

      there are no leaks at the boiler.

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Figure 53

Figure 51

Figure 52