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HCWB2 REQUIRED MAINTENANCE
Component identification for the following procedure is
listed in figure 3.
Electric shock hazard. Can cause injury
or death. Disconnect all electrical power
supplies before servicing. Shut off wa-
ter supply before disconnecting or tap-
ping into any water supply line.
WARNING
!
1 − Disconnect main power to furnace.
2 − Make a note of the humidistat setting and turn
humidistat to the
OFF
position.
3 − Turn off water supply.
4 − Slide the plastic latch to release the humidifier cover.
Swing the cover open, then lift it away from the
assembly.
5 − Turn the damper handle to the SUMMER" position.
Grasp the tabs on the pad assembly frame and lift the
assembly out of the humidifier cabinet.
6 − Unsnap the pad assembly from the tabs on the sides
of the distribution tray. Remove the distribution tray
from the pad assembly. Lightly scrape off any mineral
deposits from the surface of the distribution tray.
7 − Slide the humidifier pad out of the frame. Twist and
flex the frame to loosen the calcium deposits on the
frame or use a putty knife to clean the frame. Replace
the humidifier pad annually or more frequently if
necessary. Slide the pad back into the frame with the
black mark facing up. Snap the distribution tray back
into place.
8 − Position the pad frame assembly so that the tabs are
pointing outward. Align the drain extension on the
pad assembly with the drain spud in the humidifier
base. Reinsert the humidifier pad assembly in the
base. Push the pad assembly in at the top until the
assembly snaps into place. Replace the front cover.
Turn the damper handle to the WINTER" position.
9 − Remove the drain hose from the bottom of the
humidifier. Bend and flex the hose to loosen any
internal calcium deposits. Flush the hose with water
under pressure and slip it back onto the drain spud.
The drain hose should have a constant downward
slope and must not be flattened or blocked.
10− Turn on water supply.
11− Check humidifier operation:
Manual Humidistat −
Adjust humidistat to highest
setting and make sure the furnace blower is
operating. Humidifier will operate if RH is less than
50%.
Universal Humidistat −
Check system operation by
setting the knob to
TEST
position. With furnace
blower operating and furnace calling for heat,
humidifier will operate for one minute. Press the
RESET
button on the side of the control to reset the
Change Humidifier Pad" indicator.
12− Set manual humidistat or universal humidistat to its
original position.
FIGURE 4
HCWB2 Humidifier Parts Identification
HUMIDIFIER
BASE
HUMIDIFIER PAD
ASSEMBLY
(with frame tabs
pointing outward)
SOLENOID
VALVE
DRAIN HOSE
DISTRIBUTION
TRAY
DAMPER
WINTER/SUMMER
ADJUSTMENT LEVER
(Close damper during
summer operation)
LATCH
TABS
