BAYSTAT253A HUMIDITY CONTROL
3
69-1698
Pub.No.: 22-5203-01
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 humidifier
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
during blower motor cycles for correct
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.
Fig. 5. Typical wiring diagram for
system with fan interlock.
Fig. 6. Typical wiring diagram for system
with 2-speed fan motor.
Fig. 7. Typical wiring diagram of current
sensing relay with humidifier.
Fig. 8. Typical wiring diagram
of sail switch with humidifier.
Fig. 9. Typical wiring diagram for steam humidifiers.
1
1
2
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
24 VAC WIRING.
2
HUMIDIFIER
TRANSFORMER
FURNACE
FAN
MOTOR
HUMIDISTAT
FAN CONTROL
L1
(HOT)
L2
M19831
POWER
SUPPLY
1
1
H
L
C
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
24 VAC WIRING.
2
HUMIDIFIER
TRANSFORMER
2-SPEED
FAN
MOTOR
DPST
SWITCHING
RELAY
HUMIDISTAT
FAN CONTROL
L1
(HOT)
L2
M19832
POWER
SUPPLY
M19833
L1
(HOT)
L2
1
2
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
24V WIRING.
HUMIDIFIER
TRANSFORMER
WATER
SOLENOID
LEAD WIRE
CURRENT
SENSING
RELAY
C
LO
HI
HUMIDISTAT
M19834
L1
(HOT)
L2
1
2
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
24V WIRING.
HUMIDIFIER
TRANSFORMER
HUMIDISTAT
SAIL
SWITCH
M19835
1
1
1
FOLLOW THE INSTALLATION INSTRUCTIONS
INCLUDED WITH THE STEAM HUMIDIFIER
TO WIRE THE SYSTEM FAN.
NOTE:
HUMIDIFIER
HUMIDISTAT
TO
SYSTEM
FAN
HUMIDISTAT
TERMINALS
FAN WIRING
TERMINALS
24V WIRING.
