Shutdown Procedures —
To shut down your humidi-
fier, close the saddle valve on the water line. Then turn off
the humidistat. When set to the OFF position, the humidistat
shuts off the electrical power to the solenoid valve on the
humidifier.
NOTE: If your home comfort system includes cooling, be
sure the water supply to your humidifier is turned off during
the cooling season. Close the damper located in the bypass
duct if one is installed. If your humidifier is a part no. P110-
WTR2019A, drain and clean the water pan as described in
cleaning procedures.
PERFORMING ROUTINE MAINTENANCE
With the proper maintenance and care, your humidifier will
operate economically and dependably. Maintenance can be
accomplished easily by referring to the following directions.
However, before performing any maintenance, consider these
important safety precautions:
Disconnect all electrical power to the humidifier and fur-
nace before performing any service or maintenance to
avoid personal injury or death.
NOTE: There may be more than one electrical disconnect
switch.
Although special care has been taken to minimize sharp
edges in the construction of your humidifier, be ex-
tremely careful when handling parts or reaching into the
unit to avoid personal injury.
Your humidifier has been designed for easy disassembly
to simplify cleaning and servicing. Your unit must be kept
clean to maintain its efficiency.
Regular inspection allows you to determine the cleaning
schedule best suited to your humidifier’s operating condi-
tions. The frequency for required maintenance will depend
most upon the available water supply. In areas where hard
water and high mineral content are prevalent, more frequent
cleaning and servicing may be required.
At minimum, the humidifier will need to be cleaned at the
beginning of every heating season.
Cleaning Procedures
P110-LBP2018A, P110-SBP2017A, P110-LFP1025A, AND
P110-SFP1016A HUMIDIFIERS
1. Turn off all electrical power to the humidifier and furnace
or fan coil.
2. Turn off the humidifier’s water supply. (See Fig. 3.)
3. Disassemble the humidifier.
• To disassemble a P110-SBP2017A humidifier, gently
pull the latch that secures the access panel. Remove the
door and slide the evaporator pad assembly out of the
unit. (See Fig. 7.)
• To disassemble either a P110-LBP2018A or P110-
LFP1025A humidifier, first remove the water supply con-
nection to the solenoid valve. Next, remove the screw
that holds the distributor cover to the cabinet, and lift
off the cover. Disconnect the drain line from the sump
and loosen the thumbscrews(s) holding the sump to the
cabinet. Remove the sump. Remove evaporator pad as-
sembly. (See Fig. 5 or 6.)
• To disassemble a P110-SFP1016A humidifier, the pad
assembly can be removed from the side access door or
the front cover. When removing the side door, lift the
pad assembly up by holding the tabs and slide the as-
sembly out. When removing the front cover, discon-
nect the quick connects to the solenoid valve, unscrew
the 4 screws to the front cover, snap loose the top and
bottom catches, and lay the front cover aside. Once the
front cover is off, lift the pad assembly up and twist it
out. The pad assembly consists of 4 parts; the distribu-
tor pan, frame, sump, and the evaporator pad. Pull the
distributor pan apart from the frame and the evaporator
pad can be removed. Do not force the evaporator pad
in or out without removing the distributor pan as this
will distort the pad. See Fig. 8.
4. Clean the humidifier’s external components.
• If your humidifier is a P110-SBP2017A humidifier, wash
the access door and outlet drain portion of the cabinet.
Make sure the drain is open.
• If your humidifier is a P110-LBP2018A, P110-SFP-
1016A, or P110-LFP1025A unit, wash the distributor
cover, sump cover, and cabinet. Be sure the inlet ports
are open and clean. Then, clean the sump with a so-
lution of detergent and water.
5. Clean the internal components of your humidifier. Wash
the distributor pan with a mild detergent and warm water.
Be sure holes and slots in the pan are clean and unob-
structed. Wash the evaporator pad assembly in a deter-
gent solution. If there are scale deposits on the pad, soak
CABINET
FRONT COVER
SCREWS (4)
SIDE ACCESS DOOR
PAD ASSEMBLY
SOLENOID VALVE
DISTRIBUTOR PAN
(HIDDEN)
Fig. 8 — Humidifier Details — P110-SFP1016A
BEARING RETAINER
CABINET
PAD
PAN
Fig. 9 — Humidifier Details — P110-WTR2019A
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