Harman Stove Company PB 105 - Manual (Page 34)

34 3-90-07205R19_05/13
Maintenance
The boiler 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. 23. 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. 24.
NOTE: Be careful 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 boiler. Any horizontal and
vertical flue pipe directly above the unit should be
cleaned at this time
NOTE: The horizontal flue pipe directly above the
boiler 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 boiler.
Clean the flue outlet throat as well as the inner chamber
of the flue tunnel (this is the hole that goes up into the
flue pipe). See Fig. 24.
NOTE: The exhaust probe sensing tip extends into
this same area. CARE MUST BE TAKEN NOT TO
DAMAGE THE ESP DURING CLEANING. Bending
of the ESP will make it difficult to remove if it should
become necessary. See Fig. 23.
Clean the boiler blower plate, sealing overlap. See Fig
24. Make sure there are no fly ash buildups that may
block the easy flow of flue gasses into the combustion
blower inlet hole. (A flashlight may be necessary.)
Cleaning the Tube Heat exchangers:
Three external cleaning rods allow scraping of the heat
exchange tubes with a simple in-and-out motion. See
picture on page 32.
This cleaning should be done at least once a week,
however it can be done more often as desired. The
cleaner the heat exchangers are, the more efficient the
boiler will be. It is best to perform during a low fire period
or when the fire is out. During high fire periods, the
cleaning rods may stick due to heat related expansion.
Combustion Blower Cleaning
Remove the combustion blower heat shield. There are
two latches that hold the shield in place (See Fig. 22).
Flip the latches up and pull the shield away from the
boiler. It can not be fully removed, it can only be moved
down over the wire until it hangs on the junction box.
CAUTION: Inspect flue pipes, flue pipe joints and
flue pipe seals regularly to ensure that smoke and
flue gases are not entering the home.
Fig. 23
Thumb Screws (3 Total)
Combustion
Blower Motor
Exhaust Probe
Heat Shield
Latch
Fig. 22
Fig. 24
Sealing Overlap
5” Double
Bladed Fan