General Inspections; Servicing Supplementary Burner - Navien NCM-1130HH Installation Instructions Manual

7.3 General Inspections

1) Remove the appliance cover and place safely to one side.
2) Visually check the appliance for any signs of leaks or damage.
3) Ensure that the condensate trap is visually inspected to asses for any signs of blockage or
build up of debris.
4) Replace cover.
If in any doubt contact KD NAVIEN or your supplier.

7.4 Servicing Supplementary Burner

1) Turn OFF the mains power supply.
2) Close the gas shut-off valve and safeguard against reopening
3) Remove the two screws at the bottom of the boiler with plus driver release 4 clips.
4) Pull out the hook up on the underside and topside of the boiler.
5) Pull out the front cover carefully and detach the connecter of HMI from the control Box.
6) Remove gas inlet manifold(A) release each 4 screws at the manifold from the mix chamber
and spool valve assembly.
7) Release the igniter and frame detection probe.
8) Unplug the overheat sensor from exhaust duct.
9) Release the three screws on the top of mix chamber(B) and pull it out.
10) Check the burner(C) and mix chamber gasket(G) and EPDM sealing(F)for faulty parts and
replace it if necessary.
11) Check the burner (C) after taking out from heat exchanger (E).
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