Product Overview

53
103859-12 - 8/19
MPO-IQ
Installation & Service Manual
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.
!
11 Boiler Cleaning