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DESOOTING PROCEDURE
CAUTION: SOOT IS COMBUSTIBLE. EXERCISE
EXTREME CARE. NEVER USE A WIRE BRUSH.
Soot can clog areas between fins and cause even-
tual tube failure. Any sign of soot at the base of the
burners or around the outer jacket indicates a need for
cleaning.
1. Disconnect top portion of unit. (See heat ex-
changer
removal procedure steps 1 through 6).
2. Remove burner tray (See burner tray removal
procedure.)
3. Take a garden hose and wash heat exchanger,
making sure soot is removed completely from be-
tween fins. Avoid excessive water against refrac-
tory.
NOTE: In extreme cases it may be necessary to re-
move the heat exchanger completely for cleaning. The
simplest method is steam cleaning at the local car
wash. DO NOT WIRE BRUSH.
COMBUSTION CHAMBER REMOVAL
1. Remove heat exchanger (See heat exchanger
removal procedure).
2. Lift up and remove front and rear refractory shield.
3. Remove refractory panels.
4. Reverse above procedure to re-install.
CONTROL IMMERSION WELL REPLACE
1. Remove plumbing and top portion of unit (See
heat exchange removal procedure steps 1
through 6).
2. Remove U.G. spring, U.G. and copper shield.
3. Collapse well tube at open end with chisel.
4. Push well up through header.
5. Insert new well and roll in place. If a roller is not
available, solder the well in place with silver solder.
Immersion Well
UNITHERM GOVERNOR (U.G.) REPLACEMENT
1. Shut water, gas and electricity off, close valves and
relieve pressure.
2. Drain heat exchanger.
3. Disconnect inlet & outlet pipes with flange from in/
out header.
4. Grasp retainer spring from inlet side of header, and
slide thru inlet hole.
5. Remove shield.
6. Remove U.G. with seating gasket, and stainless
steel baffle (not shown).
7. Reverse above procedure to re-install.
U.G.
U.G.
Shield
Outlet Inlet
Inlet/Outlet
Header
To test the operation of the Unitherm Governor,
place in hot water (over 110°F) and watch for movement
against spring. If there is no movement, replace unit.
Refactory Panel Top View
Fig . # 8155.0s
Fig . # 8126.0s
Retainer
Spring
Fig . # 8158.1
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