Aprilaire Premium Digital Humidifier Control Safety And Installation Instructions Manual page 9

USING FURNACE TERMINALS TO DETECT FURNACE
BLOWER OPERATION (FIGURE L)
This configuration allows the humidifier to run only during heat
call, even if the thermostat is set for continuous fan operation.
Figure L
DIGITAL HUMIDIFIER CONTROL TERMINAL STRIP
R C
24 VAC
TRANSFORMER
OUTDOOR TEMPERATURE
SENSOR OR MANUAL
MODE RESISTOR
A B ODT W/G Cf H
FURNACE
TERMINAL
STRIP
16
USING HUMIDIFIER CONTROL TO ACTIVATE HVAC BLOWER
ON CALL FOR HUMIDITY (FIGURE M)
Figure M
10VA
TRANSFORMER
PROVIDED WITH
HUMIDIFIER
90-1223
MODE SWITCH IN "A" POSITION
DIGITAL HUMIDIFIER CONTROL
ODT W/G
R C A B Cf
OUTDOOR
TEMPERATURE
SENSOR
WHITE/YELLOW
WHITE/BLUE
4851 RELAY
APRILAIRE
TYPICAL 24 VAC
TERMINAL STRIP
R C W G Y
IN FURNACE
REMOVE WIRE
"G" TO "G"
THERMOSTAT
R C W G Y
17
H
500 & 600 SERIES
YELLOW WIRES
400 SERIES
YELLOW WIRE &
WHITE WIRE
700 SERIES
BROWN WIRES
NOTE:
18 AWG WIRE IS
ACCEPTABLE FOR 24V
INSTALLATIONS.
NOTE:
PLUMB HUMIDIFIER
TO HOT WATER WHEN
USING THIS WIRING
CONFIGURATION.
90-1398