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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.
A. CLEAN THE FLUEwAYS (See Figure 27).
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. There is a pair of baffles in each boiler.
The baffles are installed in the 2
flue ways) on the MST396, MST513 and MST629.
4. Clean the 3
Pass – Insert a 2" dia. x 42" long
rd
wire or fiber bristle brush into each of the two 3
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
pass flue way.
rd
5. Clean the 2
Pass - Insert a 2" dia. x 42" long wire
nd
or fiber bristle brush into each of the two 2
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
pass flue way.
nd
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.
5
SECTION x: BOILER CLEANING
WARNING
pass (two inner
nd
rd
passes.
nd
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. The baffles are installed in the 2
pass (two inner flue ways) on the MST396, MST513
and MST629.
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.
nd
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