Operating Instructions - Model 400, 600 & 700; Automatic Mode - Aprilaire 400 Owner's Manual

II. OPERATING INSTRUCTIONS – 400, 600 & 700
There are 2 possible modes of operation of your Aprilaire Humidifier
Control – Automatic and Manual. An explanation of both modes follows:
Automatic Mode: (Manual Mode-see pg 6)
Your Aprilaire Humidifier Control is installed in the cold air return duct.
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 home's construction.
Refer to the "Operation Guide" (Table 1).
TABLE 1 – Operation Guide
Condition
Condensation on windows
Lack of humidity
Humidifier does not operate
Humidifier won't shut off
Test mode
Reset Water Panel change
indicator
Solution
Reduce the setting on the control dial
by 1 increment.
Increase the setting on the control dial
by 1 increment.
Turn dial to "Test/Reset." Make certain
furnace is operating in heat mode.
If unit still doesn't operate, contact your
heating contractor.
Turn dial to "Off." If unit continues to
operate, contact your heating
contractor.
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. Be sure to turn
the control knob back to the prior setting
after checking humidifier operation.
Turn the control knob to the
"Test/Reset" position until the "Change
Water Panel" light blinks to reset the
water panel change indicator timer.
(Blower must be operating and furnace
calling for heat.) Be sure to turn the
control knob back to the prior setting
after resetting the timer.
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