Maintenance - Weil-McLain SlimFit 2 Series Manual

SlimFit Series 2
®

Maintenance

Disconnect power before servicing
Electrical shock hazard — Disconnect all electrical
power to the boiler before attempting maintenance
procedures. Failure to complete could result in se-
vere personal injury, death or substantial property
damage.
Perform startup and check/out
Removing and reinstalling components can change
boiler behavior.
After any maintenance procedure, you must verify
operation after servicing. To do so, follow the com-
plete procedure for boiler and system startup, be-
ginning on page 79. Failure to comply could result in
severe personal injury, death or substantial property
damage.
Label all wires prior to disconnection when serving
controls. Wiring errors can cause improper and
dangerous operation.
General maintenance
1. Oil motors in system requiring regular oiling.
2. See Oiled bearing pumps for motor oiling procedures.
Oiled-bearing pumps
1. Check pumps in the system. Oil any pumps requiring oil,
following pump manufacturer's instructions. Over-oiling will
damage the pump.
Clean the heat exchanger when
required — water side
1. In order for the efficiency of boilers to increase beyond the
condensing limit, new materials have been introduced for the
heat exchanger, including aluminum.
2. Aluminum has excellent heat transfer characteristics and is
light in weight.
3. These new materials also require cleaning solutions that differ
from those used in conventional cast iron and steel boilers.
One common cleaning method that
used with systems containing aluminum is a solu-
tion of trisodium phosphate, commonly referred to
as "TSP."
The reason that trisodium phosphate cannot be
used is that the cleaning solution has a very high
pH level — while removing the scale in the system,
it also removes the natural protective oxide layer
from the aluminum. The oxide layer will reform, but
if small amounts of the trisodium phosphate remain
in the system, the chemical will continue to remove
the protective oxide layer, leading to reduced heat
exchanger life.
4. Weil-McLain recommends Sentinel X400 for cleaning boiler.
See the Repair Parts section at the end of this manual for
ordering information.
102
commercial condensing gas
CANNOT
— Boiler Manual
-
fired water boiler
Clean the heat exchanger when
required — flue side
1. Shut down boiler:
a. Follow "To Turn Off Gas to Appliance" instructions
on boiler and Lighting instructions.
b. Do not drain boiler unless it will be exposed to freez-
ing temperatures. If using freeze prevention fluid in
system, do not drain.
2. Allow time for boiler to cool to room temperature if it has
been firing.
Remove heat exchanger cleanout 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 13mm wrench or socket to remove the nuts that
secure the heat exchanger cleanout plate to the heat
exchanger (Figure 93, page 103).
5. Remove the cleanout plate. Handle the cleanout plate
gasket carefully to avoid damage.
6. Follow the procedure on page 91 to remove the burner,
piping end combustion chamber access plate and the
blower/venturi/mixing tube assembly.
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 94, page 103.
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 con-
densate line.
b. Remove the line and place a pan under the trap
connection.
2. Use the combustion chamber openings at either end
be
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.
Inspect cleanout plate gasket
1. Inspect the cleanout plate gasket (Figure 93, page 103).
Replace if damaged.
Part number 550-100-561/0224