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H8908A/B HUMIDISTAT H8908C/D DEHUMIDISTAT
WIRING
CAUTION
Personal Injury Hazard.
Can cause electrical shock and injury.
Disconnect power before installation or servicing.
All wiring must comply with applicable local codes,
ordinances and regulations. Make wiring connections
according to humidifier (or dehumidifier/ventilator)
instructions, if available; otherwise, see typical wiring
diagrams in Fig. 12–19.
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 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. On HE365 fan powered humidifier mod-
els, only the two yellow wires are connected to
the control. The remaining two red wires are only
used with electronic humidity controls.
6. Using wire nuts, connect the low-voltage wire to the
leads on the H8908 humidistat. See Fig. 6–19 for
different wiring configurations.
Fig. 10. Wire the humidistat.
7. Mount the humidistat by hooking the two hinges at
the top of the back cover to the raised edge at the
top of the base bracket. Press the bottom of the
humidistat in to engage the base hinge. You will
hear a "click" when the humidistat is secured.
Fig. 11. Attach the humidistat to the base.
69-1341EF—01
L1
(HOT)
L2
1
2
L1
(HOT)
L2
1
2
M24734
M24801
4
POWER
FAN CONTROL
SUPPLY
1
FURNACE
FAN
MOTOR
PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
24 VAC WIRING.
Fig. 12. Wiring H8908 with fan interlock.
POWER
FAN CONTROL
SUPPLY
DPST
1
SWITCHING
RELAY
2-SPEED
H
L
FAN
MOTOR
C
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
24 VAC WIRING.
Fig. 13. Wiring H8908 with 2-speed fan motor.
H8908
30
40
20
50
10
60
OFF
ON
TRANSFORMER
L2
CURRENT
LO
SENSING
RELAY
C
HI
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2
24V WIRING.
Fig. 14. Typical wiring diagram of current
sensing relay with humidifier.
H8908
30
40
20
50
10
60
OFF
ON
2
TRANSFORMER
HUMIDIFIER
M24727
H8908
30
40
20
50
10
60
OFF
ON
2
TRANSFORMER
HUMIDIFIER
M24728
WATER
2
SOLENOID
LEAD WIRE
1
L1
(HOT)
HUMIDIFIER
M24729
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