Navien NCB-20LHWE, Руководство по установке и эксплуатации

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7. Use a Phillips screwdriver to remove the two screws (four
screws for NCB-33LHWE) where gas inlet pipe is attached to
the fan motor assembly. Loosen the hex nut located above
the gas valve and remove the gas pipe.
Remove
2 screws
here
Loosen
the hex
nut here
NCB-20/23/28/33LHWE
Remove
4 screws
here
Loosen
the hex
nut here
NCB-33LHWE
8. Remove the screw connecting the fan motor assembly
and the mixing chamber, and then remove the fan motor
assembly.
9. Remove the five bolts securing the chamber brackets.
10. Remove the two screws connecting the ignition transformer
to the heat exchanger and then remove the ignition
transformer.
11. Remove the rubber packing at the top of the cover and put
a Phillips screwdriver into the hole, and then loosen the
middle bolt located at the back of the burner.
3
2
1
12. Remove the five bolts connecting the mixing chamber and
the heat exchanger, and then remove the mixing chamber,
burner and the chamber bracket.
13. Use the brush to dislodge the debris and pour water down
the channels to flush out the debris.
Note
It is important to keep electric parts of the boiler
safe from water.
Navien recommends to use a hose.
If the water pressure of the hose is too high, water
may splash to other electric parts of the boiler.
Keep the water pressure of the hose as low as it can.
If the boiler is installed in high area and you cannot
see the inside of the heat exchanger, use a solid
support and be careful not to fall.
14. As cleaning the heat exchanger is finished, reassemble the
parts.
Note
This boiler requires very little maintenance, however
a qualified technician should inspect the boiler at the
beginning of every heating season and/or when there
is a problem.
68 Appendices