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1110
Manual Humidifier Control
Figure C – Manual Humidifier Control
90-1237
Your Aprilaire humidifier is controlled by a Manual Humidifier
Control (see Figure C). The Manual Humidifier Control is
installed either in the cold air return duct or on an interior wall of
the home. With the Manual Humidifier Control, it is important to
anticipate a drop in outdoor temperature and reduce the setting
accordingly to avoid excessive condensation, just as with the
Digital Humidifier Control installed in Manual Mode (see page 5).
To determine the indoor RH, slowly turn the knob clockwise and
counterclockwise and listen for 2 clicks. The indoor RH is within
the range of the 2 clicks.
Check the Humidifier Operation
DIGITAL HUMIDIFIER CONTROL
Set the knob to “Test/Reset”, make sure that the water saddle
valve is open and that there is electricity to the humidifier. The
HVAC fan must be running for the humidifier to function. NOTE:
Turning the knob to “Test/Reset” resets the “Change Water
Panel” timer. The humidifier will only operate for 1 minute in test
mode. (Model 400 and 400M: Floats must be down for the
solenoid valve to allow water flow.) Reduce the Humidifier
Control setting to the recommended inside humidity, depending
on the outside temperature. DO NOT LEAVE IN TEST MODE
AS HUMIDIFIER WILL NOT OPERATE.
MANUAL HUMIDIFIER CONTROL
Set the knob to the highest setting, make sure that the water
saddle valve is open and that there is electricity to the humidifier.
The HVAC system must be operating for the humidifier to
function. Confirm that the solenoid valve is energized and water is
flowing into the humidifier. Return control knob to desired setting.
Annual Summer Shutdown
Digital Humidifier Control in Automatic Mode (see Figure A)
and Blower Activation switch is in the ”OFF” position:
No adjustment is necessary.
Digital Humidifier Control in Automatic Mode (see Figure A)
and Blower Activation switch is in the ”ON” position:
Set the knob to the “OFF” position.
Digital Humidifier Control in Manual Mode (see Figure B):
Set the knob to the “OFF” position.
Manual Humidifier Control (see Figure C):
Set the knob to the “OFF” position.
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