3
•
Supply- and return-air grilles should not be blocked by items
such as drapes, furniture, and toys. Restricted airflow reduces
the efficiency of the humidifier, as well as that of the whole com-
fort system.
•
The humidifier unit must be properly maintained on a regular
basis.
STARTUP PROCEDURES
1. Open the saddle valve on the water supply line. (See Fig. 4.)
Set humidistat to the desired relative humidity. (See Fig. 5
and Table 2.)
2. Turn the furnace on and adjust the thermostat to a high tem-
perature setting. Be sure that the furnace blower is operating.
3. Check to see if water is flowing into the humidifier.
A95257
A95258
Fig. 4
Fig. 5
•
On a Model 49BF or Model 49FH humidifier, loosen the
thumbscrew that holds the distributor cover to the top of the cab-
inet. 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 flowing. (See Fig. 6 or 7 according to the model you own.)
A95259
Fig. 6 — Model 49BF
•
On a Model 49BG 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. 8.)
•
On a Model 49FP humidifier, open the side door or the front
cover. If the front door 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. 9.)
•
On a Model 49WS unit, look through the window on front of
the unit to see that the evaporator pad is rotating and water is
flowing. (See Fig. 10.)
The Model 49WS is controlled by a float valve. Turning off the
furnace will not affect the water flow until float level is achieved.
(See Fig. 11.)
A95260
Fig. 7 — Model 49FH
A95261
Fig. 8 — Model 49BG
A95262
Fig. 9 — Model 49FP
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 desired
room temperature.
HUMIDISTAT
SOLENOID VALVE
DISTRIBUTOR COVER
DISTRIBUTOR PAN
EVAPORATOR PAD
CABINET
BOTTOM ACCESS
PANEL
SOLENOID VALVE
DISTRIBUTOR COVER
DISTRIBUTOR PAN
EVAPORATOR PAD
CABINET
BOTTOM ACCESS PANEL
INLET
CABINET
DUCT HOUSING
DRAIN
SIDE ACCESS DOOR
EVAPORATOR PAD
DISTRIBUTOR PAN
SOLENOID VALVE
FRONT COVER
SCREWS (4)
PAD ASSEMBL
SIDE ACCESS DOOR
