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AIR
PRESSURE SWITCH/
SAIL SWITCH
2
TRANSFORMER
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2
24V WIRING.
Fig. 15. Wiring H8908 in line with
air pressure switch/sail switch and humidifier.
TH9421 VISION PRO
THERMOSTAT
H8908B
24 VOLT
TRANSFORMER
30
40
50
20
10
60
OFF
ON
COM N.O. N.C.
S688 AIR
PRESSURE
SWITCH/
SAIL SWITCH
Fig. 17. Wiring H8908 with VisionPRO® IAQ on typical 2-stage furnace.
VISIONPRO ® THERMOSTAT
Y2
L
A
W2
S1
S2
HEATING
RELAY OR
VALVE COIL
COOLING
FAN
CONTACTOR
RELAY
COIL
COIL
1
PROVIDE OVERLOAD PROTECTION
AND DISCONNECT MEANS AS REQUIRED.
Fig. 18. Wiring H8908 with VisionPRO®
Thermostat for dehumidification.
H8908
40
30
20
50
10
60
OFF
ON
1
L1
(HOT)
HUMIDIFIER
M24730B
1
2
3
C
L2
SYSTEM
TRANSFORMER
L1
R
C
L2
R
L1
HE225/HE265
HUMIDIFIER
RC
R
W
Y
G
C
H8908D
30
40
20
50
10
60
OFF
ON
1
M24725
H8908A/B HUMIDISTAT; H8908C/D DEHUMIDISTAT
H8908
FAN WIRING
30
40
TERMINALS
20
50
10
60
1
OFF
ON
HUMIDISTAT
TERMINALS
1
24V WIRING.
NOTE:
FOLLOW THE INSTALLATION INSTRUCTIONS
INCLUDED WITH THE STEAM HUMIDIFIER
TO WIRE THE SYSTEM FAN.
Fig. 16. Wiring H8908 with steam humidifiers.
EQUIPMENT INTERFACE MODULE
CONV.
1
W1
2
W2
3
W3
C
Y
24 VAC
R
Y2
RC
G
RH
L
H1
U
NOT USED
M2
OUT1
D1
H
OR
OUT2
M2
IN1
V1
N
IN2
T2
DATS1
DATS2
H8908D
30
40
20
50
10
60
OFF
ON
Fig. 19. Typical wiring diagram for HR150,
HR200, ER150 and ER200 Ventilator
or DH90 Dehumidifier applications.
5
1
HUMIDIFIER
M24731
HP
STAGE 1
HEAT
O/B
AUX
AUX2
STAGE 2
Y
HEAT
Y2
G
COMPRESSOR
FAN
RELAY
C7089U1006
M24724B
VENTILATOR/DEHUMIDIFIER
TERMINALS
Fresh Air Ventilation System
Système de ventilation à air frais
M24732
69-1341EF—07
TO
SYSTEM
FAN
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