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Wiring
All wiring must comply with local codes and ordinances.
Make wiring connections according to humidifier instruc-
tions, if available; otherwise, see typical wiring diagrams in
Figs. 4 through 8.
CHRONOTHERM ® III THERMOSTAT
H8808C
B
O
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
1
PROVIDE OVERLOAD PROTECTION AND
DISCONNECT MEANS AS REQUIRED.
Fig. 4. Typical parallel wiring of humidity controller
®
with Chronotherm
III Thermostat for dehumidification
and mildew control.
CHRONOTHERM ® III THERMOSTAT
B
O
W
Y
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
1
PROVIDE OVERLOAD PROTECTION
AND DISCONNECT MEANS AS REQUIRED.
Fig. 5. Typical series wiring of humidity controller with
Chronotherm
®
III Thermostat for dehumidification and
mildew control.
W
Y
R
G
FAN
RELAY
COIL
1
R
G
H8808C
FAN
RELAY
COIL
1
H8808B HUMIDISTAT H8808C DEHUMIDISTAT
HEATING
CONTROL
Y495
F50 OR
ODOR
F51 AIR
CONTROL
CLEANER
B
HI
LO
COM.
M9467
H8808B
HUMIDIFIER
1
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
2
USE OPTIONAL HOOKUP WITH ISOLATING RELAY (DASHED
LINE) IF HEATING CONTROL HAS A SEPARATE POWER
SUPPLY. ISOLATION OF THE POWER SUPPLIES CAN ALSO
BE ACCOMPLISHED BY USING SPECIAL THERMOSTAT
SUBBASE COMBINATIONS WITH ISOLATED CIRCUITS SUCH
AS T87F-Q539A1147, T834A-Q634A1039, T822A-Q611A1037.
REFER TO SPECIFICATIONS FOR DETAILS.
NOTE: IN TOTAL COMFORT APPLICATIONS, A DPST FAN SPEED
RELAY MUST BE USED. A SPDT RELAY PERMITS AN
OVER-VOLTAGE FEEDBACK FROM THE FAN MOTOR
THAT BURNS OUT THE TRANSFORMER AND/OR
THE HUMIDIFIER MOTOR.
Fig. 6. R8239B typical hookup for heating-cooling
system with 2-speed fan and R8239 fan center.
M9466
L1
POWER
(HOT)
SUPPLY
L2
1
1
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
2
24 VAC WIRING.
Fig. 7. Wiring diagram for system with fan interlock.
3
R882 ISOLATION
RELAY
CHRONOTHERM ® III
THERMOSTAT
W
G
Y
R
W
W
R
G
Y
C
FAN
SWITCH
R8243 CONTACTOR
OR COMPRESSOR
CONTROL PANEL
FAN CONTROL
TRANSFORMER
FURNACE
FAN
HUMIDIFIER
MOTOR
2
PRIMARY
HEATING
CONTROL
BLACK
L1
(HOT)
POWER
SUPPLY
L2
WHITE
1
M9465A
2
H8808B
M9469A
69-1039B
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