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Extension Pieces (2)
HEAT EXCHANGER REMOVAL
1. Shut water, gas and electricity off, close valves
and relieve pressure, then remove relief valve.
Remove side inspection panels.
2. Remove top jacket holding screws.
3. Remove rear top panel.
4. Remove screws mounting the rain shield to the
rear panel. Also remove the screws that mount the
rain shield to the sway brace. Remove rain shield.
5. Remove the four (4) screws holding down the flue
collector. Remove the flue collector.
6. Disconnect flange nuts on Inlet/Outlet header,
loosen union(s) at gas pipe and slide heater away
from piping.
7. Lift heat exchanger straight up using caution not to
damage refractory.
8. Reverse above procedure to reinstall. Make sure
the insulation strips are properly replaced on top of
the refractory retainer.
TUBE CLEANING PROCEDURE
Establish a regular inspection schedule, the frequency
depending on the local water conditions and the sever-
ity of service. Do not let the tubes clog up solidly.
Clean out deposits over 1/16" in thickness.
The heater may be cleaned from the return header
side, without breaking pipe connections. It is prefer-
able, however, to remove both headers for better visi-
bility through the tubes and to be sure the ground-up
lime dust does not get into the system.
Note that you do not remove the top panel or the
heater exchanger, generally.
After reaming, mount the wire brush in place of the
auger and clean out debris remaining in the tubes.
Another method is to remove the heat exchanger,
ream tubes and immerse heat exchanger in non-inhib-
ited de-scale solvent for severe scale build-up.
DESOOTING PROCEDURE
WARNING: SOOT IS COMBUSTIBLE. EXERCISE
EXTREME CARE.
Soot will clog areas between fins and cause eventual
tube failure. Any sign of soot at the base of the burn-
ers or around the outer jacket indicates a need for
cleaning.
1. Remove top and flue collector from cabinet.
2. Remove "V" baffles from heat exchanger.
3. Remove burner tray. (See page 39).
Auger with Carbide Tip
4. Remove heat exchanger from the heater and wash
with a garden hose, making sure soot is removed
from spaces between fins.
5. Reverse above procedure to reinstall.
NOTE: In extreme cases it may be necessary to do
steam cleaning at the local car wash. DO NOT WIRE
BRUSH.
COMBUSTION CHAMBER REMOVAL
To remove combustion chamber, you must first have
removed the heat exchanger.
Atmospheric Heaters
REFRACTORY PANELS - TOP VIEW
IMMERSION WELL REPLACEMENT
(Millivolt and ASME)
1. Shut off water to heater and drain heat exchanger.
2. Remove access panel on water connection side.
3. Remove old immersion well with bushing and
sleeve.
4. Install replacement well in header.
NOTE: Installation in polymer header should be hand
tight plus 1/2 turn.
40
Wire Brush
Lo NOx Heaters
Well Assembly
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