Aprilaire 400 Troubleshooting Guide Page 5

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98
Figure D Fiber Board Duct Mount
90-1203B
CONTROL BOARD
COVER
KNOB
BASE PLATE
RETURN DUCT
RETURN
DUCT
SHEET METAL
PLATE
CUT OPENING IN
RETURN DUCT
SHEET METAL PLATE
GASKET
SCREW (x2)
INSIDE OF
RETURN
DUCT
Figure E Digital Humidifier Control 24V Terminals
90-1397B
HHGfW GODTBACR
OUTDOOR
TEMPERATURE
SENSOR
24 VAC FROM
HVAC EQUIPMENT
“R” AND “C”
COMMUNICATION
WITH APRILAIRE
8570 THERMOSTAT
HEAT SIGNAL
FROM HVAC
EQUIPMENT
FAN SIGNAL
FROM
THERMOSTAT
SOLENOID
CONTROL
OUTPUT
FAN SIGNAL
TO HVAC
EQUIPMENT
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