35
3-90-07205R26_10/14
Combustion Blower/Heat exchanger 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
previous page.
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.
Fig. 23
Latch
Heat Shield
Fig. 22
Fig. 24
Sealing
Overlap
5” Double
Bladed Fan
CAUTION
!
Inspect flue pipes, flue pipe joints and flue pipe seals
regularly to ensure that smoke and flue gases are not
entering the home.
ESP
Combustion
Blower Motor
Thumb Screws (3) Total
