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II. OPERATING INSTRUCTIONS
Automatic Humidifier Control: (Manual humidistat-see pg 5)
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).
- 3 -
(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.” Make certain furnace
blower is operating and furnace is calling
for heat. If unit still doesn’t operate, 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.” Make certain furnace blower
is operating and furnace is calling for heat.
Humidifier will operate for one minute.
Off
7
6
5
4
3
2
1
T
e
s
t
N
O
R
M
A
L
Humidity Level
(Figure A)
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 Aprilaire
Humidifier.