Part number 550-142-058/0811
WM97+
gas
-
fired
water
boiler
—
Boiler Manual
90
Maintenance
a. Turn the boiler ON/OFF switch to OFF.
b. TURN OFF all power to the boiler.
c. Close the manual gas valve below the boiler.
d. Close the external piping isolation valves on the
boiler supply and return lines.
e. Close the isolation valves in the DHW circuit if con-
nected to the bottom boiler connections.
f. Close the expansion tank shutoff valve (item 160,
Figure 99, page 101).
g. Connect a hose to the boiler drain valve. Open the
drain valve and drain the boiler.
h. To allow air to flow into the boiler piping during
draining, lift the relief valve lever slightly or open a
purge valve in the external piping, if available.
4. Disconnect the circulator wire harness connector.
5. Follow instructions supplied with the replacement circu-
lator cartridge to remove the circulator motor housing
and replace the cartridge. Reassemble the circulator.
6. Refill the boiler with water, allowing air to escape
through the relief valve or purge valve, if available.
7. Reconnect the circulator wiring connector.
8. Close the boiler drain valve. Open all isolation valves,
including the internal expansion tank isolation valve.
9. Restore power and restart the boiler, following all pro-
cedures in this manual.
Oiled bearing circulators
1. The circulator installed in the WM97+ boiler is water-
lubricated. No oiling is required.
2. Check other circulators in the system. Oil any circula-
tors requiring oil, following circulator manufacturer’s
instructions. Over-oiling will damage the circulator.
Boiler circulator repair
Circulator cartridge replacement
1. The circulator supplied with the boiler is a water-lubricated,
cartridge-type circulator. If the circulator fails, try replacing the
circulator cartridge instead of replacing the entire circulator. Re-
placing the circulator can be much more complicated, requiring
more time to do.
2. Purchase the circulator cartridge (item 190/210, Figure 99, page 101)
for the boiler circulator. See the correct cartridge part number in
Figure 98, page 100 and on circulator label. Cartridges are available
from Weil-McLain and their distributors.
3. Isolate and drain the boiler
Disconnect power
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.
Install boiler jacket front door after
startup or servicing
Reinstall boiler jacket front door after start-up or
servicing. The boiler front door must be securely
fastened to the boiler to prevent boiler from drawing
air from inside the boiler room. This is particularly
important if the boiler is located in the same room
as other appliances.
Inspect boiler jacket door gaskets. Gaskets must be
in good condition, with no tears or gaps. Replace if
necessary.
Failure to keep the door securely sealed and fastened
could result in severe personal injury or death.
Perform start-up and check/out
Removing and reinstalling components can change
boiler behavior. After any maintenance procedure,
you must prove the boiler is operating correctly. To
do so, follow the complete procedure for boiler and
system start-up, beginning on page 68. Failure to
comply could result in severe personal injury, death
or substantial property damage.
DO NOT SERVICE THE
BOILER WITHOUT A
WM97+ MAINTENANCE KIT
AVAILABLE
The WM97+ maintenance kit includes components
that may have to be replaced when accessing or disas-
sembling parts of the boiler. Failure to replace dam-
aged components and to use only the parts specifically
intended for the boiler can result in severe personal
injury, death or substantial property damage. See Fig-
ure 93, page 95 for part number.
