3
2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 3
System Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 21
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 22
TABLE OF CONTENTS
WARNING
1. 120 volts may cause serious injury from electrical
shock. Disconnect electrical power to the HVAC
system before starting installation.
2. Sharp edges may cause serious injury from cuts.
Use care when cutting plenum openings and
handling ductwork.
CAUTION
1. Do not set humidity higher than recommended.
Condensation damage may result.
2. Do not set humidity up to recommended levels if
there is condensation on the inside of windows of
any unheated living space. Condensation damage
may result.
3. Do not mount the Humidifier Control on the supply
plenum or duct. The unit cannot withstand supply
temperatures and will malfunction.
4. When installing the Humidifier Control on a
counterflow furnace, ensure the blower continues
to run after a heat call is satisfied to eliminate high
temperatures from damaging the Humidifier Control.
5. Do not mount the Humidifier Control downstream of
the bypass outlet. False humidity conditions will
cause the humidifier to operate incorrectly.
6. Avoid installing the Humidifier Control with the display
facing downward to prevent the Humidifier Control
from incorrectly measuring the relative humidity
(RH) in the duct.
THESE INSTALLATION INSTRUCTIONS ARE FOR THE
APRILAIRE DIGITAL HUMIDIFIER CONTROL ONLY!
For Aprilaire
®
humidifier installation, follow Aprilaire
Humidifier Installation Instructions.
INSTALLATION
STEP 1: Unpack the Humidifier Control Carton
Make sure all components are present (see
Figure A
):
A
. Humidifier Control
B.
Outdoor Temperature Sensor
C.
Manual Mode Label
D.
Manual Mode Resistor Case
B
A
C
D
Figure A
90-1201
