W415-0702 / 10.30.08
35
9.3.2 SOOT ANd FLY ASh FORmATION
The products of combustion will contain small particles of fly ash. The fly ash will collect in the exhaust venting system and
restrict the flow of the flue gases. Incomplete combustion occurs during startup, shutdown, or incorrect operation of the
room heater will lead to some soot formation which will collect in the exhaust venting system. The exhaust venting system
should be inspected at least once every year to determine if cleaning is necessary.
9.3.3 CLEAN ThE vERTICAL ExhAUST dUCT
If the PRPP40 or the brick kit NP841KT is in place, remove that accessory first.
A.
Open side door, release the latch and pivot the viewing door wide open.
Next, remove the left and right louvre assemblies.
B.
Remove the one screw on each exhaust port located on either side of the
fire box. Remove the exhaust port doors and set aside on a
non-combustible surface.
Insert a vacuum into the exhaust port holes and remove as much fly ash
as possible from the left and right exhaust manifolds. Once clean, replace the
exhaust port doors and secure with the screws.
Exhaust Port
To clean the exhaust blower and exhaust housing, the heater must be pulled out from the heater cavity. Remove
the venting from the exhaust collar. If installed as a top vent, remove cover plate from the rear of the housing.
If installed as a rear vent, remove the cover plate from the top of the housing. vacuum out the housing back to
blower outlet.
9.3.4 CLEAN ExhAUST hOUSING (INSERT ONLY)
9.3.5 CLEAN ThE ExhAUST BLOWER
NOTE: Do not attempt this maintenance without a replacement exhaust blower
motor mounting gasket.
A. Remove the six nuts holding the exhaust blower motor in place.
B. Pull the motor out being careful not to damage the wiring, unplug the two wires
that are connecting the motor and gently set aside. (The pieces of gasket may
be discarded.
C.
Start by cleaning the exhaust tube by feeding a brush or rag through the inside
of the tube and out the exhaust blower housing.
D.
Vacuum out the exhaust ports and the blower housing.
E.
With a bristle brush vacuum, clean the blades of the motor.
F.
Place the new exhaust blower mounting gasket around the screw holes
being very careful not to tear it.
G.
Re-attach the wiring to the motor and place it back on to
the housing, taking care that the side of the motor does not
tear the gasket and then re-attach the nuts.
Exhaust
Blower
Exhaust
Housing
Nuts
TP - SOOT ANd FlY ASh_PEllET
TP - vERTICAl ExhAUST dUCT_PEllET
TP - ExhAUST blOWER_PEllET
fIGure 9.3.3
fIGure 9.3.5a
fIGure 9.3.5c
