U.S. Boiler Company MPO - IQ, Service Instructions Manual

Page: 59 / 92

59
xII. BOILER CLEANING
A. CLEAN THE FLUEWAYS
(See Figure 35).
1. For access to the combustion chamber remove the two (2)
3/8" - 16 cap screws. If boiler is equipped with flexible
fuel line(s), swing door open.
2. Remove the two smoke box clean-out covers from the
rear smoke box by removing the four 5/16"-18 hex head
bolts. It is NOT necessary to remove the vent connector
from the smoke box to clean boiler.
If necessary, remove the vent connector if there is evidence
of heavy soot accumulation in the boiler or to inspect base
of chimney for condensate or accumulation of debris.
3. Remove the baffles (if installed) from the flue passages.
Refer to Section II, Paragraph F for Baffle Installation.
4. Clean the 3
rd
Pass – Insert a 2" dia. x 42" long wire or
fiber bristle brush into each of the two 3
rd
passes. Using
long strokes push the brush all the way through the boiler
until the brush has exited the smoke box opening. Pull
the brush all the way forward until it has exited the front
of the boiler. Continue this operation for the entire height
of the flue way until clean. Repeat the operation for the
other 3
rd
pass flue way.
5. Clean the 2
nd
Pass - Insert a 2" dia. x 42" long wire or
fiber bristle brush into each of the two 2
nd
passes. Using
long strokes push the brush all the way through the boiler
until the brush hits the back wall of the reversing chamber.
Pull the brush all the way forward until it has exited the
front of the boiler. Continue this operation for the entire
height of the flue way until clean. Repeat the operation
for the other 2
nd
pass flue way.
6. Vacuum the loose debris in the bottom of the combustion
chamber and smoke box.
B. CLEAN THE COMBUSTION CHAMBER
– Use
a wire or fiber bristle brush to clean the surfaces of the
combustion chamber. Vacuum all of the loose debris in the
bottom of the combustion chamber.
C. AFTER CLEANING, vacuum all remaining debris
as necessary. Inspect burner swing door insulation, and
rope gasket for signs of damage. If damaged, replace as
needed.
D. REASSEMBLE BOILER.
CAUTION
Do not start the burner unless the burner swing
door and canopy cover plates are secured in place.
1 Insert the baffles (if originally installed) into the correct
flue way. Refer to Section II, Paragraph F for Baffle
Installation.
2. Attach the smoke box clean-out covers onto the rear of
the boiler. Verify that the rope gasket is in good working
order before assembly. Replace rope gasket if necessary.
Use the 3/8" hardware originally removed. Do not over
tighten. They should be snug but not bottomed out.
NOTICE
When securing burner swing door make sure door
is drawn-in equally on both sides.
Tighten swing door hardware to provide adequate seal to
rope gasket around perimeter of door.
Use an alternating tightening method from right side to
left side cap screw to pull door tight equally.
NOTICE
Do not overtighten. The rope gasket will provide
sufficient seal when the door is snugged into
place.
WARNING
All boiler cleaning must be completed with burner service switch turned off. Boilers equipped with burner
swing door have a potential hazard which can cause severe property damage, personal injury or loss of life
if ignored. Before opening swing door, turn off service switch to boiler to prevent accidental firing of burner
outside the combustion chamber. Disconnect the burner plug from the receptacle in the front jacket. Be sure
to tighten swing door fastener completely when service is completed.