2. During the coldest portion of the first heating season, minor
adjustments may be necessary, depending on the home’s con-
struction. See Table 1.
The RH in your home will be accurately controlled to meet your
needs and should not need further adjustment during future heating
seasons. Make note of the dial setting in the event the knob gets
moved.
Your humidifier is part of a system that will accurately maintain the
RH in your home. For every 1°F change in outdoor temperature, the
automatic humidifier control will automatically adjust the indoor rel-
ative humidity by 0.5% RH. If you would like to determine the RH in
your home, follow these steps:
1. Determine the outdoor temperature.
2. Activate the furnace blower by setting your thermostat fan switch
to the
ON
position, or by setting your thermostat to a higher temper-
ature.
3. Turn the control dial setting to the
OFF
position. Then, slowly turn
the dial clockwise until you hear the solenoid valve click on. Slowly
turn the dial counterclockwise until you hear the solenoid valve
click off. At this point, make note of the dial setting.
4. Locate your dial setting on Table 2. Follow the dial setting to the
right until it intersects with the current outdoor temperature. This
is the RH in your home under existing conditions.
5. Return the thermostat and control to their original settings.
As an example, if the outdoor temperature is 20°F and, following step
3, the humidifier turns off at “5”on the dial range, then the RH in your
home is 35%.
The automatic humidifier control will accurately control the humidi-
ty in your home to a maximum of 45% RH and a minimum of 10% RH.
The values of outdoor temperature and dial settings may fall in
between or outside of the listed values in Table 2. In these cases, you
will be able to approximate your home’s actual indoor RH.
Operating Instructions – Manual Mode
If an outdoor temperature sensor has not been installed with your
automatic humidifier control, the control is installed in the cold air
return and is set for manual mode operation. In this case, it is impor-
tant to keep the humidifier control setting at the recommended level
in order to avoid excessive indoor RH. This will prevent the formation
of condensation on inside windows (fogging or frost on windows).
For example, with an outside temperature of 20°F, the correct setting
will be 35% RH. If the temperature is expected to fall to 0°F that
evening, then adjust the setting to provide 25% RH several hours
prior to the temperature change.
The recommended settings on the sticker on the front of the control
and in the table on page 2 are based on years of research and expe-
rience. For example, a winter time indoor RH of 50% may be
considered ideal for your personal comfort, however, this setting
may result in damage to your home. Observance of the recommend-
ed RH levels on your humidifier control, therefore, is an important
safeguard. These settings represent a compromise between RH lev-
els that are desirable for comfort reasons and humidity levels, which
will avoid condensation on your windows.
The humidifier control 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 actu-
al 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 com-
ing out at the drain, reduce the humidifier control setting to the
recommended inside RH, depending on the outside temperature. Do
not leave the control in the test mode. The humidifier will not oper-
ate properly in the test mode. Anticipate a drop in the outside
temperature and lower the setting several hours before the drop in
outside temperature occurs.
Effect of Water Characteristics
Your humidifier will operate effectively using either hard or mechan-
ically softened water.
Any type of water (hard, soft, hot, or cold) is acceptable for use with
the CCWB3 or CCWP3 drain-type humidifiers. Hot supply water, 140°
maximum, is recommended for all heat pump applications. The use
of hot supply water will also increase the humidifier’s capacity.
Table 2 – % RELATIVE HUMIDITY GUIDE
Outdoor Temperature (˚F)
-10
0
10
20
30
40
1
10
10
10
15
20
25
2
10
10
15
20
25
30
3
10
15
20
25
30
35
4
15
20
25
30
35
40
5
20
25
30
35
40
45
6
25
30
35
40
45
45
7
30
35
40
45
45
45
D
ia
l
S
e
tt
in
g
WARNING
Risk of Scalding
Water temperature over 125˚F can cause severe burns and
scald instantly.
Shut off the hot water supply before disconnecting or tapping
into any hot water supply line.
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