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FIGURE 4 – RECOMMENDED WIRING FOR MODEL 65 CONTROL AND EVAPORATIVE HUMIDIFIER
MODEL 65 CONTROL
C
R
H
H
APRILAIRE
EVAPORATIVE
HUMIDIFIER
SOLENOID VALVE
CIRCUIT WIRES
FIGURE 5 – ALTERNATE WIRING FOR MODEL 65 CONTROL AND EVAPORATIVE HUMIDIFIER
MODEL 65 CONTROL
C
R
H
H
APRILAIRE
EVAPORATIVE
HUMIDIFIER
SOLENOID VALVE
CIRCUIT WIRES
6
HVAC EQUIPMENT
C
R
G
W
Y
ACCESSORY
24V
TERMINALS
90-2499
HVAC EQUIPMENT
C
R
COMMON
MOTOR LEAD
HVAC BLOWER
MODEL 50
RELAY
24VAC
CONTINUOUSLY POWERED
TRANSFORMER
90-2500
WIRING MODEL 65 WITH MODEL 800 STEAM HUMIDIFIER
The Model 65 control requires 24VAC� See FIGURE 6�
1. Disconnect power from the Model 800 and HVAC system�
2. Connect 24VAC to the C and R terminals on the Model 65�
3. Connect the H terminals on the Model 800 to the H terminals on the Model 65�
4. Snap the Model 65 front cover on the back plate� The 4-pin terminal aligns with the terminal
block receptacle on the back plate�
5. Proceed to SYSTEM CHECKOUT on page 9�
Note: If the Model 800 Steam Humidifier is installed with a Model 850 Fan Pack, the Model 65
Control can be powered from the 24VAC secondary wires on the Model 800 transformer, by
splicing into the wires using tap connectors� See FIGURE 7�
FIGURE 6 – RECOMMENDED WIRING FOR MODEL 65 CONTROL AND MODEL 800 STEAM HUMIDIFIER
APRILAIRE MODEL 800 STEAM HUMIDIFIER WITH MODEL 65 DIGITAL
MANUAL CONTROL AND #4851 BLOWER ACTIVATION RELAY
REMOVE WIRE
TYPICAL 24 VAC
"G" TO "G"
TERMINAL STRIP
THERMOSTAT
IN FURNACE
Y
Y
G
G
W
W
C
C
R
R
NOTE: 18 AWG WIRE
IS ACCEPTABLE FOR
24V INSTALLATIONS.
CONSTANT 24 VAC
POWER SOURCE
MODEL 65 CONTROL
C
24VAC
R
H
H
APRILAIRE
4851 RELAY
APRILAIRE MODEL 800
STEAM HUMIDIFIER
WHITE/YELLOW
WHITE/BLUE
90-2503
7
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