Fig. 4—Saddle Valve
Fig. 5
•On a Model HUMBBLBP or Model HUMBBLFP humidifier, 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 flowing. (See Fig. 6 or 7 according to the model you own.)
SOLENOID VALVE 
DISTRIBUTOR COVER 
DISTRIBUTOR PAN
EVAPORATOR PAD 
CABINET
BOTTOM ACCESS 
PANEL
Fig. 6—
Model HUMBBLBP2018-A--
•On a Model HUMBBSBP 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 HUMBBSFP humidifier, open the side door or the front cover. If the front cover is opened, hold the pad assem-
bly in place. Check to see if water is flow- ing from the solenoid valve into the distributor pan. (See Fig. 9.)
•On a Model HUMBBWTR 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 HUMBBWTR is controlled by a float valve. Turning off the furnace will not affect the water flow until float level is achieved. (See Fig. 11.)
SOLENOID VALVE
DISTRIBUTOR COVER 
DISTRIBUTOR PAN
EVAPORATOR PAD
CABINET 
BOTTOM ACCESS PANEL 
Fig. 7—
Model HUMBBLFP1025-A--
INLET
CABINET | SOLENOID VALVE |
DISTRIBUTOR PAN
EVAPORATOR PAD
DUCT HOUSING
SIDE ACCESS DOOR
RECTIFIER
DRAIN 
Fig. 8—
Model HUMBBSBP2017-A--
CABINET
FRONT COVER
SCREWS (4)
PAD ASSEMBLY
SIDE ACCESS DOOR
Fig. 9—
Model HUMBBSFP1016-A--
4.Turn off the furnace. When the blower stops, look into the humidi- fier 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.
SHUTDOWN PROCEDURES
To shut down your humidifier, 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 in- cludes 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 Model HUMBBWTR, drain and clean the water pan as described in cleaning procedures.
PERFORMING ROUTINE MAINTENANCE
With the proper maintenance and care, your humidifier will operate economi- cally 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 ELECTRI- CAL POWER TO THE HUMIDIFIER AND FURNACE BEFORE PER- FORMING ANY SERVICE OR MAINTENANCE TO AVOID PER- SONAL INJURY.
BEARING RETAINER |
CABINET |
PAD |
PAN |
Fig. 10— |
Model |
NOTE: THERE MAY BE MORE THAN 1 ELECTRICAL DISCON- NECT SWITCH.
•ALTHOUGH SPECIAL CARE HAS BEEN TAKEN TO MINIMIZE SHARP EDGES IN THE CONSTRUCTION OF YOUR HUMIDIFIER, BE EXTREME- LY 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.
