York Whole-House Fan Powered Humidifiers, Whole-House Bypass Humidifiers User Manual

The Automatic Humidifier Control is a precision
instrument that can be used to determine the RH accurately
in your home during the winter. If you would like to determine
the relative humidity in your home, follow these steps:

1. Activate the furnace blower by setting your
thermostat fan switch to the “On” position, or by setting
your thermostat to a higher temperature.

2. Turn the control dial setting to the “Off” position.
Then, slowly turn the dial clockwise until you hear the
solenoid valve “click on”. Next, slowly turn the dial
counterclockwise until you hear the solenoid valve “click
off”. This will be very close to the actual RH in your home.

Check the Humidifier Operation

(both automatic and
manual modes). Set the knob to “Test/Reset” make sure
that the water saddle valve is open and that there is
electricity to the unit. 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, reset the humidistat to it’s
original setting.

Change Humidifier Pad light

(both automatic and
manual modes). If the Change Humidifier Pad light
remains lit, your Humidifier Pad needs to be replaced.
After changing the Humidifier Pad, turn the knob to
“Test/Reset” until the Change Humidifier Pad light starts to
blink. Note: Control must be powered (furnace on) to reset
the Humidifier Pad Change indicator.

If the Change Humidifier Pad light is blinking, your unit
is in Test mode. Do not leave in Test mode or humidifier
will not operate. Turn the knob to it’s original setting for
normal operation.

INSTALLER:

Please leave these

Operating Instructions with the homeowner.

AUTOMATIC

HUMIDIFIER CONTROL

OPERATING

INSTRUCTIONS

Manual Mode (Automatic Mode – see page 1)

Your Automatic Humidifier Control is installed in the cold
air return. When installed in the manual mode it is important
to anticipate a drop in outdoor temperature and reduce the
setting accordingly to avoid excessive condensation. For
example, with an outdoor temperature of 20˚ the correct
setting will be 35% relative humidity. If the temperature is
expected to fall to 0˚ that evening, then merely reduce the
setting to 25% several hours prior to the temperature change.

The recommended settings on
the humidistat are based on years
of research (see table 3) for the
average home. These settings
represent a compromise between
RH levels that would be most
desirable for comfort reasons and
humidity levels that are suitable for
protection of your home and to
avoid condensation on your windows. For example, a
wintertime indoor RH of 50% may be considered ideal for
comfort, but unfortunately, it probably would result in
damage to your home. Observance of the recommended
RH levels on your humidistat, therefore, is an important
safeguard. Condensation of water on inside windows in
the form of fogging or frost is usually an indication of too
much relative humidity. This same condensation can take
place in other areas in your home with the possibility of
damage resulting.

Outside Temperature

+40˚F
+30˚F
+20˚F
+10˚F

0˚F

-10˚F

-20˚F

Recommended RH

45%
40%
35%
30%
25%
20%
15%

10007640 1.08 Form 358011 Printed in U.S.A.
B2204496A

(Figure B)

(Table 3) Outdoor– Indoor Relative Humidity

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©2008 Unitary Products Group

5005 York Drive, Norman, OK 73069

90-1055

YOUR HUMIDIFIER

Your Humidifier is controlled by the Automatic Humidifier
Control. It offers two modes of operation. Automatic or
Manual. No other humidification system is fully automatic
when operating in the automatic mode, and computer
equipped for your complete comfort and satisfaction.This
system will benefit you in the following ways:

1. Automatically adjusts your home’s relative humidity

(RH) based on the outdoor temperature.

You always

receive the optimum amount of humidity.

2. Eliminates the need to manually adjust the control when

outdoor temperature changes – a common occurrence

with manual humidistats.

3. Precisely controls the relative humidity in your home,

and increases the time in which maximum comfort is

maintained.

Your home and its furnishings are
always protected from the damaging effects of
excess condensation or low humidity.

4. Eliminates the need to turn the dial setting to “Off”
during the summer season.

Simple operation with

few adjustments.

OPERATING INSTRUCTIONS

Automatic Mode

(Manual Mode – see page 4)

Your Automatic Humidifier Control is installed in the cold

air return. During the first heating season, your
Automatic Humidifier Control needs to be set initially to
match your home’s condition. Please follow these steps
when adjusting your control (refer to Figure A).

1. Turn the dial setting knob to “5”, which is within the
normal range. During the next 24-48 hours, it may be
necessary to adjust the dial for more or less humidity,
depending on your personal comfort and home’s
requirements. Refer to the “Operation Guide” (

Table 1

).

2. During the coldest portion of the first heating season,
minor adjustments may be necessary. This is
dependent upon your individual home construction;
refer to the “Operation Guide” (

Table 1

).

The relative humidity in your
home will now 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 you temporarily move the
knob when performing annual
maintenance of the humidifier.

Additional Information

Your humidifier is a high precision system that will
accurately maintain the relative humidity in your home. For
every 1˚F change in outdoor temperature, the Automatic
Humidifier will automatically adjust the indoor relative
humidity (RH) by 1/2%. If you would like to determine the
relative humidity in your home, follow these steps:

1. Determine the outdoor temperature.

2. Activate the furnace blower by setting your thermostat

to a higher temperature.

(Table 1) Operation Guide

Condition Solution

Condensation on windows. Reduce the setting on the control

dial by 1 increment.

Lack of humidity. Increase the setting on the control

dial by 1 increment.

Humidifier does not operate. Turn dial to “Test/Reset”. Make certain furnace
(Solenoid does not “click” blower is operating and furnace is calling
when control is moved to for heat. If unit still doesn’t operate,
“Test/Reset” position.) consult a heating contractor.

Humidifier won’t shut off. Turn dial to “Off”. If unit continues to

operate, consult a heating contractor.

Test mode. System operation is checked by setting the

knob to “Test/Reset”. Make certain furnace
blower is operating and furnace is calling for
heat. Humidifier will operate for one minute.

3. Turn the control dial setting to the “Off” position. Then,
slowly turn the dial clockwise until you hear the
solenoid valve “click on”. Next, 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 relative humidity in
your home under existing conditions.

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 relative humidity in your home is 35%.

5. Return the thermostat and control to their original
settings.

The Automatic Humidifier Control will accurately control

the humidity 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 can only
approximate your home’s actual indoor relative humidity.

(Table 2) % Relative Humidity Guide

Outdoor Temperature (˚F)

-10 0 10203040

1 101010152025

2 101015202530

3 101520253035

4 152025303540

520253035 40 45

6 25 3035404545

7 30 3540454545

Dial Setting

Relative Humidity (%)

(Figure A)

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