Harman Stove Company PF 100 - Manual (Page 32)

32 PF100
Combustion Blower Cleaning
Remove the combustion blower heat shield.There
are two latches that hold the shield in place . See Fig. 69
Flip the latches up and pull the shield away from the
furnace. It can not be fully removed, it can only be moved
down over the wire until it hangs on the junction box.
The furnace MUST be OFF and COOL before
you should attempt to clean the combustion blower.
The wire to the combustion blower doesn’t need
to be disconnected during the cleaning process.
Loosen the three (3) thumb screws about 4 turns
each. See Fig. 70. Hold the motor head with one hand
and the blower plate handle with the other hand. Pull
outward on the plate handle until the complete unit comes
loose. Now rotate the plate counter-clockwise about
1/8 turn. This will allow the complete assembly to be
removed from the blower chamber.
Clean the blower fan blades and the blower plate
sealing overlap. See Fig. 71.
Note: Be carefull not to bend the fan blades, this
will throw the fan blade out of balance or it may rub the
inner chamber, which may affect the performance of the
furnace. Any horizontal and vertical flue pipe directly
above the unit should be cleaned at this time.
Note: The horizontal flue pipe directly above the
furnace is the first place fly ash will settle, due to the
slowing of flue gas velocity through horizontal pipe.
Cleaning of horizontal venting pipes is very important to
the efficiency of this furnace.
Fig. 70
Fig. 71
Thumb Screws
Fig. 69
Latch
Maintenance
Sealing Overlap