WIRING
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 on the next two pages.
IMPORTANT
Select models of fan centers include humidifier 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 furnace blower. Premature transformer burnout can occur. On HE365 fan powered humidifier models, 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 the next two pages for different
wiring configurations.
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.
Humidistat Wiring
M24734A
CAUTION: Personal Injury Hazard. Can cause electrical shock and injury.
Disconnect power before installation or servicing.
Humidier 33-00067EF—01
15
Installing the Humidistat
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