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Start-Up Procedures
1. Open the saddle valve on the water supply line. (See
Fig. 3.) Set humidistat to the desired relative humidity.
(See Fig. 4 and Table 1.)
2. Turn the furnace on and adjust the thermostat to a high
temperature setting. Be sure that the furnace blower is
operating.
3. Check to see if water is flowing into the humidifier.
• On P110-L8P2018A or P110-LFP1025A humidifiers,
loosen the thumbscrew that holds the distributor cover
to the top of the cabinet. Lift up the distributor cover
slightly to make certain that water is flowing from the
solenoid valve into the distributor pan. Do not lift the
cover off the cabinet more than 1 in. when water is flow-
ing. (See Fig. 5 or 6.)
• On a P110-SBP2017A humidifier, gently pull the latch
that secures the access door. Remove the door. Check
to see if water is flowing from the solenoid valve into
the evaporator pad. (See Fig. 7.)
• On a P110-SFP1016A humidifier, open the side door
or the front cover. If the front cover is opened, hold the
pad assembly in place. Check to see if water is flowing
from the solenoid valve into the distributor pan. (See
Fig. 8.)
• On a P110-WTR2019A humidifier, look through the win-
dow on front of the unit to see that the evaporator pad
is rotating and water is flowing. (See Fig. 9.)
The P110-WTR2019A humidifier is controlled by a float
valve. Turning off the furnace will not affect the water
flow until float level is achieved.
4. Turn off the furnace. When the blower stops, look into
the humidifier to make sure the water is not flowing into
the unit.
5. Replace the cover assembly and fasten securely.
6. Now, turn the furnace on and set the thermostat for de-
sired room temperature.
Fig. 3 — Saddle Valve
M I D
H U
Fig. 4 — Humidistat
A T
I S T
SOLENOID VALVE
DISTRIBUTOR COVER
DISTRIBUTOR PAN
EVAPORATOR PAD
CABINET
BOTTOM ACCESS
PANEL
Fig. 5 — Humidifier Details — P110-LBP2018A
SOLENOID VALVE
DISTRIBUTOR COVER
DISTRIBUTOR PAN
EVAPORATOR PAD
CABINET
BOTTOM ACCESS PANEL
Fig. 6 — Humidifier Details — P110-LFP1025A
INLET
CABINET
DUCT
HOUSING
RECTIFIER
DRAIN
Fig. 7 — Humidifier Details — P110-SBP2017A
2
SOLENOID
VALVE
DISTRIBUTOR
PAN
EVAPORATOR
PAD
SIDE
ACCESS
DOOR
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