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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. 12–18.
IMPORTANT
Select models of fan centers include humidi-
fier taps so the current sensing relay, sail
switch or air pressure switch is not needed. If
not using a current sensing relay, sail switch,
or air pressure 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 fur-
nace blower. Premature transformer burnout
can occur. On HE365 fan powered humidifier
models, only the two yellow wires are con-
nected 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–
18 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
69-1341EF—09
L1
(HOT)
L2
1
1
2
L1
(HOT)
L2
1
M24734
1
2
4
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.
POWER
FAN CONTROL
SUPPLY
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
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.
M24801
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
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