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TABLE 1 – Operation Guide
- 4 -
There are two possible modes of operation of your Aprilaire Humidifier
Control - Automatic and Manual. An explanation of both follows:
Automatic Mode: (Manual Mode-see pg 6)
Your Humidifier Control is installed in the cold air return. During the first
heating season, your 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).
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
AUTOMATIC MODE
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.
II. OPERATING INSTRUCTIONS- 448, 558, 568, 768
FIGURE A