Weil-McLain 2 Series Manual page 102

®
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 severe
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 complete
procedure for boiler and system startup, beginning
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 danger-
ous 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, follow-
ing 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 con-
densing 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 solution 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 chemi-
cal 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
-
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 freezing
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 in-
spection opening.
Water spray the heat exchanger
1. Disconnect the condensate line at the bottom of the heat ex-
changer 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.
be
2. Use the combustion chamber openings at either end 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.
— Boiler Manual
Part number 550-100-180/0917