Navien CH-180 Service manual - page 134
©Navien America Inc. 2010
CH series service Manual
Version 1.0
8.2.13. Circulation Pump
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. Remove the drain plug on the pump.
7. Open the drain plug on the pump.
8. Loosen the screw from bottom base.
16. Turn on water supply, power
supply, and gas supply.
17. Open a hot water tap and ensure
there are no leaks at the boiler.
9. Remove the stainless clip.
10. Remove the stainless nut from the
circulation pump.
11. Pull out the circulation pump.
12. Pull out the circulation pump.
13. Replace the O-ring & packing. (in
service parts)
14. Replace with new circulation pump.
15. Replace the stainless clip.
16. Reseat the non-threaded end of
circulation pump into the stainless
fitting. At this time, be watchful the
black gasket ring(packing).
132
Figure 37
Figure 38
Figure 36
NOTE
1. When it drained, might be water
temperature still high.
2. Use right size of O-ring
3. When it drained, careful to wet
other electrical components.
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