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WM97+
-
gas
fired water boiler
Maintenance
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 disassembling
parts of the boiler.
Failure to replace damaged components and to use only
the parts specifically intended for the boiler can result
in severe personal injury, death or substantial property
damage.
See Figure 123, page 119 for part number.
Disconnect power
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.
Re-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.
Start-up and check/out
Removing and reinstalling components can
change boiler behavior. After any maintenance
procedure, you must prove the boiler is oper-
ating correctly. To do so, follow the complete
procedure for boiler and system start-up,
beginning on page 87. Failure to comply
could result in severe personal injury, death
or substantial property damage.
– 110 –
— Boiler Manual
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 replac-
ing the circulator cartridge instead of replacing the entire
circulator. Replacing the circulator can be much more com-
plicated, requiring more time to do.
2. Purchase the circulator cartridge, available through Weil-
McLain distributors. Find the cartridge part number on
the circulator label or in Figure 130, page 126 (WM97+70
or 110) or Figure 132, page 128 (WM97+155).
3. Isolate and drain the boiler to at least below the level of the
boiler internal circulator.
a. Turn the boiler ON/OFF switch to OFF.
b. TURN OFF all power to the boiler.
c. Close the external manual gas valve.
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. WM97+70 or 110 — Close the expansion tank shutoff
valve (item 160, Figure 131, page 127).
g. Connect a hose to the boiler drain valve. Open the drain
valve and drain the boiler to at least below the level of
the boiler internal circulator.
h. To allow air to flow into the boiler piping during drain-
ing, 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 circulator
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, includ-
ing the internal expansion tank isolation valve.
9. Restore power and restart the boiler, following all procedures
in the Start-up instructions, beginning on page 87.
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 circulators
requiring oil, following circulator manufacturer's instruc-
tions. Over-oiling will damage the circulator.
Part number 550-142-120/0113
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