Page 4
The recommended settings noted on the sticker on the
front of the control and in table 1 are based on years of
research and experience. For example, a winter time
indoor RH of 50% may be considered by you to be ideal
for your personal comfort; however, this setting may
result in damage to your home. Observance of the
recommended RH levels on your humidistat, therefore, is
an important safeguard. These settings represent a
compromise between RH levels that are desirable for
comfort reasons and humidity levels, which will avoid
condensation on your windows.
The humidistat can be used to accurately determine the
RH in your home during the winter. With the furnace
blower operating at the heating speed, turn the dial to the
lowest setting, then reverse the dial direction slowly until
you hear the solenoid valve click on. At this point, read the
RH on the dial. This will be very close to the actual RH in
your home. To check the humidifier operation, set the
knob to
TEST
. Make sure that the water saddle valve is
open and that there is electricity to the unit. Generally, the
furnace blower motor must be operating for the humidifier
to function. After the humidifier has operated for one
minute and water is entering the unit and coming out at
the drain, reduce the humidistat setting to the
recommended inside RH, depending on the outside
temperature.
Do not leave the control in the test mode.
The humidifier will not operate properly in the test
mode.
Anticipate a drop in the outside temperature and
lower the setting several hours before the drop in outdoor
temperature occurs.
Water Characteristics
Your humidifier will operate effectively using either hard
or mechanically softened water.
Any type of water (hard, soft, hot, or cold) is acceptable
for use with the HCWB2 or HCWP2 humidifiers. Hot
supply water (140
°
F maximum) is recommended for all
heat pump applications. The use of hot supply water will
also increase the unit’s capacity.
Risk of Scalding. Water temperature
over 125°F can cause severe burns and
can scald instantly. Shut off the hot wa-
ter supply before disconnecting or tap-
ping into any hot water supply line.
WARNING
!
Summer Shutdown
D
− Models equipped with a manual humidistat (figure 1)
−− Turn the humidistat control knob to the OFF
position.
D
− Models equipped with a universal humidistat in the
manual mode (figure 3) −− Turn the humidistat control
knob to the OFF position.
D
− HCWB2 bypass models (figure 5) −− Switch the
damper handle to one of the SUMMER settings to
close the damper.
Periodic Preventative Maintenance
NOTE − Annual inspection and maintenance is important
for efficient and safe operation of your humidifier. Call
your Lennox dealer for humidifier service, maintenance
inspection and replacement parts. The humidifier pad
should be replaced at least annually.
Your humidifier is equipped with an in−line water strainer
and orifice as shown. These parts should be inspected
and cleaned annually to assure continued proper unit
performance. Inspect more often if white dust" is evident.
FIGURE 4
SOLENOID VALVE COMPONENTS
OUTLET
COMPRESSION
NUT
INLINE
STRAINER
SOLENOID
VALVE
INLET
ORIFICE
(inside tubing)
INLET
COMPRESSION
NUT
1 − Disconnect electrical power to the
furnace and shut
off water supply. Make note of humidistat setting and
turn humidistat dial to OFF position.
2 − Disconnect the water line at the inlet compression
nut.
NOTE − Always use the double−wrench technique to
connect or disconnect humidifier water lines.
3 − Use a small nail or wire to remove the in−line strainer
from inside the inlet side of the valve.
4 − Flush the in−line strainer clean or replace with a new
strainer.
5 − Reinstall the in−line strainer and reconnect the inlet
water line. Take care. Do not bend or misalign the
valve bracket and tubing.
6 − Disconnect the water line at the outlet compression
nut.
7 − Check the hole in the plastic orifice to make sure the
small opening is unplugged.
Do not try to remove
the orifice from the copper tube.
8 − Reinstall the copper tube and reconnect the outlet
water line.
9 −
HCWB2 Models
−− Check to ensure that the copper
tube is inside the plastic sleeve.
