Complete burner,
door & fan assembly
removed for inspection
46
PART 8. MAINTENANCE
B. ANNUAL INSPECTION (continued)
• Dismantle the burner unit: remove
the (6) 6mm nuts (with a 10mm
socket), the ignition cable, the
power and speed control plugs,
and the ground wire from the
fan, and remove the burner/fan
unit from the heat exchanger and
cabinet.
• After the burner door is removed, it
should be thoroughly inspected
before being put back into service.
There are two gaskets on the
burner door; the first is the inner
rope gasket, which is permanently
affixed to the burner door. If this
gasket is completely compressed
(having no sealing ability), the door
must be replaced. The second
gasket is on the perimeter and
is made of rubber; this gasket is
easily replaced, and comes as a
standard part of a maintenance kit
(and should always be replaced
during the annual maintenance
procedure.
NOTE: Over-tightening the M6
nuts may cause the threaded
rods on the front of the heat
exchanger to break! If excess
resistance is encountered when
installing a M6 nut, discard that
nut and use one of the spares
shipped with the unit. The
maximum torque for assembling
a burner door nut is 5.9 ft-lb or
70.8 in-lb. Use a torque wrench
suitable for this torque range to
tighten the nuts.
• Remove and inspect the rear
fiberboard. If any resistance is
encountered with the removal of
the screw securing the fiberboard
in place, do not exert undo force;
break the fiberboard out to
provide access to the screw. Apply
penetrating oil to the screw, let it
sit, then remove. See photos below
for details. Replace only after
cleaning procedure. Use a new
fiberboard if moisture has fouled
it or if there is
any physical
damage
preventing
it from
protecting the
rear wall, such
as cracks or
warping. Warped fiberboards will
allow the back wall to overheat,
this could lead to a breach of the
back wall. This will also cause a
loss of efficiency and a rise in stack
temperature.
NOTE: Failure to replace
front and rear fiberboard
when damaged may result
in irreparable damage to the
appliance!
BOTH OF
THESE MUST
BE REPLACED!
