Napoleon Auburn NPS40 Installation And Operating Instruction page 26

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Note: Do not attempt this maintenence without a replacement exhaust blower motor mounting gasket.
Note: The heater becomes very hot during operation. Let the heater cool completely and disconnect the
power cord prior to conducting service.
CLEAN THE EXHAUST BLOWER
1. With the left side panel still removed, start your
maintenance on the exhaust blower.
2. Remove the six nuts holding the exhaust blower
motor in place.
3. Pull the motor out being careful not to damage the
wiring, unplug the two wires that are connecting
the motor and gently set aside.
4. Start by cleaning the exhaust tube by feeding a
brush or rag through the inside of the tube and
out the exhaust blower housing.
5. Vacuum out the exhaust ports and the blower
housing.
6. With a bristle brush vacuum, clean the blades of
the motor.
7. Place the new exhaust blower mounting gasket
around the screw holes being very careful not to
tear it.
8. 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. Re-attach the nuts
and then attach the side panel back onto the
heater.
W415-0587
ANNUALLY (
OR EVERY TWO TONS
Nuts
Figure 34
Figure 35
)
CLEAN THE VENT
Check for air leaks around the door, glass, and ash
pan
Air leaks into the fi rebox will decrease the heater's
performance greatly, leading to excessive soot, inef-
fi cient burning, and may even cause a malfunction.
Test the door seal by shutting the door on a piece of
paper in various locations. If the paper can be easily
slid out, air may be leaking around the door seal.
Carefully inspect the door gasket and door catch.
Inspect the door gasket to make sure it is fully
attached. Heater gasket cement can be used to
re-attach if necessary. If the door gasket is worn or
fl attened, replace.
Check the door to make sure it latches correctly. The
latch should engage with a slight amount of resis-
tance, yet not be too diffi cult.
If the glass is cracked, replace.
Open the ash pan door and inspect the gasket
around the perimeter of the ash pan door. Re-attach,
or replace the gasket if necessary.
Figure 36