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HEATING CYCLE HUMIDITY
CONTROL WIRING
CAUTION
Personal Injury Hazard.
Power supply can cause electrical shock and
injury.
Disconnect power supply before installation or
servicing.
All wiring must comply with applicable local codes, ordi-
nances and regulations. Make wiring connections
according to humidifier instructions, if available; other-
wise, see typical wiring diagrams in Fig. 5 through 9.
IMPORTANT
Select models of fan centers include humidifer
taps so the current sensing relay or sail switch
is not needed.
If not using a current sensing relay or sail
switch, the humidifier must be energized dur-
ing blower motor cycles for proper operation.
On multispeed blower applications, do not wire
the high voltage side of the transformer to the
same power source that services the furnace
blower. Premature transformer burnout can
occur.
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. 5. Typical wiring diagram for
system with fan interlock.
L1
(HOT)
POWER
FAN CONTROL
SUPPLY
L2
DPST
1
SWITCHING
RELAY
H
L
C
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
24 VAC WIRING.
Fig. 6. Typical wiring diagram for system
with 2-speed fan motor.
HUMIDISTAT
TRANSFORMER
HUMIDIFIER
HUMIDISTAT
2
TRANSFORMER
2-SPEED
FAN
HUMIDIFIER
MOTOR
1
2
Fig. 7. Typical wiring diagram of current
2
HUMIDISTAT
1
M19831
NOTE:
Fig. 9. Typical wiring diagram for steam humidifiers.
M19832
3
ASYSTAT625A HUMIDITY CONTROL
HUMIDISTAT
2
TRANSFORMER
1
L2
L1
(HOT)
CURRENT
LO
SENSING
RELAY
C
HUMIDIFIER
HI
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
24V WIRING.
sensing relay with humidifier.
SAIL
SWITCH
HUMIDISTAT
2
TRANSFORMER
1
L2
L1
(HOT)
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2
24V WIRING.
Fig. 8. Typical wiring diagram
of sail switch with humidifier.
FAN WIRING
TERMINALS
1
HUMIDISTAT
TERMINALS
HUMIDIFIER
24V WIRING.
FOLLOW THE INSTALLATION INSTRUCTIONS
INCLUDED WITH THE STEAM HUMIDIFIER
TO WIRE THE SYSTEM FAN.
WATER
SOLENOID
LEAD WIRE
M19833
HUMIDIFIER
M19834
1
TO
SYSTEM
FAN
M19835
Pub.No.:12-5034-01
69-1699
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