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Fig. 7. Installing the drain tubing.
WIRING
CAUTION
Hazardous Voltage.
Can cause personal injury or equipment damage.
Disconnect power supply before installing or
servicing equipment.
IMPORTANT
All wiring must comply with applicable local code,
ordinances and regulations.
Wire the humidifier, humidistat and transformer. See
Fig. 8—11.
L1
(HOT)
POWER
FAN CONTROL
SUPPLY
L2
1
FURNACE
FAN
MOTOR
1
PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
24 VAC WIRING.
Fig. 8. Wiring diagram with H8908 (included). Transformer
powered when single speed fan is energized.*
* When a thermostat with IAQ control is used instead of a humidistat, it simplifies the wiring circuit. The thermostat U
contacts are installed in place of the H8908 and the sail switch or other relay is removed from the circuit.
M20177
H8908
30
40
20
50
10
60
OFF
ON
2
TRANSFORMER
HUMIDIFIER
M24727
HE105, HE205 WHOLE HOME BYPASS HUMIDIFIER
L1
(HOT)
POWER
FAN CONTROL
SUPPLY
L2
1
H
L
C
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2
24 VAC WIRING.
Fig. 9. Wiring diagram with H8908 (included).
Transformer powered when two speed fan is energized.*
H8908
30
40
20
50
10
60
OFF
ON
TRANSFORMER
CURRENT
LO
SENSING
RELAY
C
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2
24V WIRING.
Fig. 10. Wiring diagram with H8908 (included) and
current sensing relay (not included).*
AIR
PRESSURE SWITCH/
SAIL SWITCH
TRANSFORMER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2
24V WIRING.
Fig. 11. Wiring diagram with H8908 (included) and sail
switch (not included).*
5
H8908
30
40
20
50
10
60
OFF
ON
2
DPST
TRANSFORMER
SWITCHING
RELAY
2-SPEED
FAN
MOTOR
HUMIDIFIER
M24728
WATER
2
SOLENOID
LEAD WIRE
1
L2
L1
(HOT)
HI
HUMIDIFIER
M24729
H8908
40
30
50
20
10
60
OFF
ON
2
1
L2
L1
(HOT)
HUMIDIFIER
M24730C
33-00229EF—03
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