—4—
Regular inspection allows you to deter-
mine the cleaning schedule best suited to
your humidifier’s operating conditions.
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 heat-
ing season.
CLEANING PROCEDURES
Models HUMBBLBP,
HUMBBSBP, HUMBBLFP, and
HUMBBSFP
1. Turn off all electrical power to the
humidifier and furnace or fan coil.
2. Turn off the humidifier’s water
supply. (See Fig. 4.)
3. Disassemble the humidifier.
•
To disassemble a Model HUMBBSBP
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. 8.)
•
To disassemble either a Model
HUMBBLBP or Model HUMBBLFP
humidifier, first remove the water supply
connection to the solenoid valve. Next,
remove the screw that holds the distribu-
tor cover to the cabinet, and lift off the
cover. Disconnect the drain line from the
sump and loosen the thumbscrew(s)
holding the sump to the cabinet. Remove
the sump. Remove evaporator pad
assembly. (See Fig. 6 or 7, according to
the model you own.)
•
To disassemble a Model HUMBBSFP,
the pad assembly can be removed from the
side access door or the front cover. When
removing the side door, lift the pad assem-
bly up by holding the tabs and slide the
assembly out. When removing the front
cover on Model HUMBBSFP, disconnect
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 distributor 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 evap-
orator pad in or out without removing the
distributor pan, as this will distort the pad.
4. Clean the humidifier’s external
components.
•
If your humidifier is a Model
HUMBBSBP humidifier, wash the access
door and outlet drain portion of the cabi-
net. Make sure the drain is open.
•
If your humidifier is a Model
HUMBBLBP or HUMBBLFP, wash the
distributor cover, sump cover, and cabinet.
Be sure the inlet ports are open and clean.
Then, clean the sump with a solution of
detergent and water.
5. Clean the internal components of
your humidifier. Wash the distribu-
tor 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 detergent solution. If
there are scale deposits on the pad,
soak it in ordinary household vine-
gar. If the pad is covered by a heavy
deposit of scale, or if the local water
supply has high sulfate or calcium
content, replace the pad with a new
one. Contact your dealer for replace-
ment part.
6. Reassemble your humidifier.
7. Turn on the electrical power and
water supplies. Refer to the startup
procedures.
Model HUMBBWTR
1. Turn off all electrical power to the
humidifier and furnace or fan coil.
2. Turn off the humidifier’s water
supply. (See Fig. 4.)
3. Drain water from the unit. Place a
pail underneath the drain plug
located on the bottom of the humid-
ifier cabinet. Lift the tab on the drain
plug and remove the plug. Allow
all water to drain from the unit.
(See Fig. 12.)
4. Remove the front door from the
humidifier. Rotate the latches one-
half turn, then pull the door forward.
5. Remove and inspect the evaporator
pad assembly. Lift the bearing from
its retainer. (See Fig. 10.) Pull the
assembly away from the motor to
disengage the assembly shaft from
the motor coupling. Remove assem-
bly through the access opening.
Inspect the evaporator pad. If the pad is
heavily loaded with scale, or if the local
water has a high sulfate content, replace
the pad. Contact your dealer for replace-
ment part.
NOTE:
For best performance, the evap-
orator pad should be replaced before each
heating season.
6. Inspect the float assembly. Remove
the float arm from the valve body by
sliding out the pin and lifting off the
float arm. (See Fig. 11.) Inspect the
rubber valve seat located inside the
float arm. If the seat appears to be
nicked or worn, invert the seat or re-
place it with the spare valve seat
located on the float arm. Inspect the
water opening in the valve body. If
the opening is clogged, use a pin to
remove the obstruction. Remove
any accumulated deposits from the
valve body and float arm.
7. Clean the water pan and unit cabi-
net. Tilt the water pan and lift it from
the unit. Wash the pan with warm,
soapy water. Flex the pan to loosen
accumulated scale. Wash the unit
interior, removing any accumulated
deposits. Inspect the drain line to in-
sure that no blockage has occurred.
Clean as required. (See Fig. 12.)
8. Reassemble your Model
HUMBBWTR humidifier. Reinsert
the water pan and drain plug. Ensure
that the overflow tube is inserted
into the hole at the bottom of the
cabinet. Attach the float arm to the
valve body by aligning the holes on
both parts and reinserting the pin.
Do not force or bend the pin.
The
float arm should have free up-and-
down movement. Install the evapo-
rator pad assembly. Ensure that the
square shaft engages the motor cou-
pling and that the bearing washer is
located inside the bearing retainer.
Turn the water on. Adjust float by
rotating until water covers inside of
foam drum. Attach the access door
and turn the latches.
Fig. 11—Float Arm Removal
Fig. 12—Cleaning Water Pan
and Unit Cabinet
9. Turn on electrical power supplies.
Refer to startup procedures listed on
page 2.
FLOAT ARM
PIN
VALVE
BODY
VALVE SEAT
HIGHER
LOWER
HUMIDIFIER HOUSING
WATER PAN
OVERFLOW TUBE
DRAIN PLUG
