35
3-90-233R24_11/13
maintenance
The boiler
muST be OFF at the circuit breaker, and COOl
before you 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 blade and the blower plate sealing
overlap. See Fig. 24.
NOTE: Be careful not to bend the fan blade, 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.
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 is no fly ash buildup that may block the easy
flow of flue gases into the combustion blower inlet hole. (A
flashlight may be necessary.)
Combustion blower Cleaning
Remove the combustion blower cover. There are two latches
that hold the shield in place (Fig. 22). Flip the latches up and
pull the shield away from the boiler.
Fig. 24
Sealing Overlap
5” Double Bladed Fan
(standard) #3-21-502221
Fig. 22
Latch
Blower Cover
Fig. 23
Three Thumb Screws
The exhaust
sensing probe
(ESP) is located
here.
CAUTION
!
Inspect flue pipes, flue pipe joints and flue pipe seals
regularly to ensure that smoke and flue gases are not
entering the home.
