How to: Replace a Main Burner on a NVx heater

1.1 Remove rectification
probe screw and
withdraw.

1.2 Remove spark
electrode screw and
withdraw.

1.3 Remove the electrical
plug connections from
the top of the gas valve.

1.4 Remove burner heat
shield (3 screws).

1.5 Burner assembly
cover removed.

1.6 Remove the four
screws holding the gas
valve flange onto the
manifold.

1.7 Remove two fixing
screws securing the
burner assembly to the
bulkhead.

1.8 Disengage from tab.

1.9 Lift out burner
assembly

1.10 Burner assembly
removed.

1.11 Using a stiff brush,
brush the burners to
dislodge accumulated
deposits.

1.12 Inspect the burners
both internal and
externally to ensure that
they are clean

1.13 Examine the
injectors and if
damaged or
deteriorated, replace
with new ones of
the correct size and
marking.

1.14 Examine the
burner heads for
signs of clogging and
deterioration.

1.15 Replace burner
assembly.

1.16 Ensure burner
assembly is engaged
into the bottom location
bracket.

1.17 Replace two fixing
screws securing the
burner assembly to the
bulkhead.

1.18 Replace burner heat
shield.

1.19 Replace the four
screws holding the gas
valve onto the manifold.

1.20 Replace the electrical
plug connections to the
top of the gas valve.

1.21 Replace spark
electrode and fix with
screw ensuring gap is
2.5mm

1.22 Location of spark
electrode.
Note: always located at
the bottom of the burner
assembly.

1.23 Replace rectification
probe and fix with screw.

1.24 Location of
rectification probe.
Note: always located at
the top of the burner
assembly.