H8908A/B HUMIDISTAT H8908C/D DEHUMIDISTAT
5
69-1341EF—01
Fig. 15. Wiring H8908 in line with
sail switch and humidifier.
Fig. 16. Wiring H8908 with steam humidifiers.
Fig. 17. Wiring H8908 with VisionPRO® IAQ on typical 2-stage furnace.
Fig. 18. Wiring H8908 with VisionPRO®
Thermostat for dehumidification.
Fig. 19. Typical wiring diagram for HR150,
HR200, ER150 and ER200 Ventilator
or DH90 Dehumidifier applications.
M247
3
0
L1
(HOT)
L2
1
2
1
2
POWER
S
UPPLY. PROVIDE DI
S
CONNECT MEAN
S
AND OVERLOAD PROTECTION A
S
REQUIRED.
24V WIRING.
HUMIDIFIER
TRAN
S
FORMER
S
AIL
S
WITCH
H
8
90
8
10
OFF
ON
20
30
40
50
60
M247
3
1
1
1
1
FOLLOW THE IN
S
TALLATION IN
S
TRUCTION
S
INCLUDED WITH THE
S
TEAM HUMIDIFIER
TO WIRE THE
S
Y
S
TEM FAN.
NOTE:
HUMIDIFIER
TO
S
Y
S
TEM
FAN
HUMIDI
S
TAT
TERMINAL
S
FAN WIRING
TERMINAL
S
24V WIRING.
H
8
90
8
10
OFF
ON
20
30
40
50
60
EQUIPMENT INTERFACE MODULE
M24724
H8908B
10
OFF
ON
20
30
40
50
60
1
2
3
C
R
RC
RH
1
2
3
24 VAC
H1
U
M2
D1
H
M2
V1
N
T2
OR
L
NOT USED
OUT1
OUT2
IN1
IN2
DATS1
DATS2
CONV.
HP
W1
W2
W3
Y
Y2
G
O/B
AUX
AUX2
Y
Y2
G
TH9421 VISION PRO
THERMOSTAT
24 VOLT
TRANSFORMER
SYSTEM
TRANSFORMER
S688
SAIL SWITCH
COM N.O. N.C.
C
R
L2
L1
C
R
L2
L1
HE225/HE265
HUMIDIFIER
STAGE 1
HEAT
STAGE 2
HEAT
COMPRESSOR
C7089U1006
FAN
RELAY
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
FAN
RELAY
COIL
PROVIDE OVERLOAD PROTECTION
AND DISCONNECT MEANS AS REQUIRED.
M24725
1
1
VISIONPRO® THERMOSTAT
Y2
L
A
W2
S1
S2
RC
R
W
Y
G
C
H8908D
10
OFF
ON
20
30
40
50
60
VENTILATOR/DEHUMIDIFIER
M247
3
2
TERMINAL
S
Fresh Air Ventilation
S
ystem
S
ystème de ventilation à air frais
H
8
90
8
D
10
OFF
ON
20
30
40
50
60
