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IV. Annual Maintenance
For best performance, we recommend that you replace the evaporative
media in your humidifier annually.
• Call the installer of your humidifier. This information is often found on your
equipment.
V. Annual Summer Shutdown
FOR THE SUMMER HUMIDIFIER SHUTDOWN, SIMPLY TURN THE
HUMIDISTAT CONTROL TO THE “OFF” SETTING AND CLOSE THE DAMPER
IN THE WB2-12 AND WB2-17 MODELS.
VI. Periodic Preventative Maintenance
NOTE: Periodic inspection and preventative maintenance of your total heat-
ing system is important for efficient and safe operation. Your Lennox dealer will
include humidifier service during a maintenance inspection.
Your humidifier is equipped with an in-line water strainer and orifice as
shown below. These parts should be inspected and cleaned periodically to
assure continued proper unit performance.
Inspection and Service Instructions
1. Disconnect electrical power to the
furnace and shut off water supply.
2. Disconnect the water line at the inlet
compression nut.
3. Remove the in-line strainer from inside
the inlet side of the valve by using a small
nail or wire.
4. Flush the in-line strainer clean or
replace with a new strainer, Service
Department, Part No. 4004.
5. Replace the in-line strainer and recon-
nect the inlet water line (Double Wrench
To Prevent Leaking).
6. Disconnect the water line at the outlet
compression nut.
7. Remove the orifice from the copper or
plastic tube and make sure this small
opening is unplugged.
8. Replace the orifice and reconnect the
outlet water line (Double Wrench To
Prevent Leaking).
9. Turn on water supply and reconnect
electrical power to the furnace.
OUTLET
COMPRESSION
NUT
ORIFICE
INLET
INLET
COMPRESSION
NUT
SOLENOID
VALVE
IN-LINE
STRAINER