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®
SlimFit
Series 3
Maintenance
Accessing & cleaning the heat
exchanger
Remove heat exchanger cover plate
and burner
1. Close the external manual gas valve.
2. Disconnect all power to the boiler.
3. Allow the boiler to cool if it has been operating.
4. Use a 13-mm wrench or socket to remove the nuts
that secure the heat exchanger cover plate to the
heat exchanger (Figure 86, page 107).
5. Follow the procedure on page 94 to remove the
burner. Disconnect wire harnesses as required to
move the mixing tube and blower assembly out
of the way.
Label all wires prior to disconnection
when servicing controls. Wiring errors
can cause improper and dangerous
operation. Always disconnect power to
boiler before servicing. Failure to comply
could result in severe personal injury,
death or substantial property damage.
6. Remove the flue inspection cover.
Use heat exchanger cleaning tool
1. Use the Heat Exchanger Cleaning Tool (supplied
with the boiler) or a piece of 20-gauge or lighter
sheet metal ¾" wide by about 18 inches long to
loosen deposits.
2. Slide the cleaning tool through the heat exchanger
pins in the three directions shown in Figure 87,
page 107.
3. Vacuum most of the debris out of the base through
the flue inspection opening.
Water spray the heat exchanger
1. Disconnect the condensate line at the bottom of
the heat exchanger so debris will not clog the trap.
a. Loosen the hose clamps at both ends of the
condensate line.
b. Remove the line and place a pan under the trap
connection.
2. Use the burner opening to spray water down onto
the heat exchanger pins. Continue spraying until all
debris on the pins has been flushed into the base.
a. Spray water into the flue inspection opening
to flush remaining sediment to the condensate
outlet.
b. Spray water through the condensate line to
clean it thoroughly.
c. Remove the pan and re-install the condensate
line.
d. Re-install the flue inspection plug.
106
COMMERCIAL CONDENSING GAS
(continued)
Inspect cover plate gasket
1. Inspect the silicone cord heat exchanger cover plate gasket. Replace if
2. Make sure the cover plate gasket is in the groove of the heat exchanger.
3. Inspect the cover plate insulation, replace if damaged.
Re-install cover plate
1. Re-install the cover plate following the sequence shown in the appropri-
2. Re-install the hex head nuts on the cover plate mounting studs and
Re-install burner, mixing tube and blower assembly
1. Follow the procedure on page 94 to re-install the burner and other
2. Reconnect wiring, including the ignitor ground wire connection to the
Restart and test the boiler
1. Restore gas supply and power to the boiler.
2. Start the boiler and verify operation following the procedures given
-
FIRED WATER BOILER
If the silicone cord gasket has been damaged or stretched,
replace it before placing the boiler back in operation. To
install the silicone cord gasket:
should start at the top middle of the gasket groove. See
Figure 86, page 107.
cleanout plate.
installed as one piece.
stretch around corners. This could cause the cord not to
seal correctly, resulting in possible flue gas or condensate
leakage.
Failure to comply could result in severe personal injury,
death or substantial property damage.
damaged.
ate illustration, Figure 88, page 107 or Figure 89, page 107.
tighten in the staggered pattern shown for the boiler model (Figure 88,
page 107 for SF-550 or Figure 89, page 107 for SF-750) until the cover
plate is uniformly tightened.
Gradually tighten the cover plate nuts in the sequence shown.
Torque to 18 N-m/160 in-lbs/13 ft-lbs.
components.
top ignitor mounting screw.
in this manual.
—
Boiler Manual
Part number 550-100-168/0516
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