Honeywell HE280C and Lennox Surelight


Old 12-07-20, 06:55 AM
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Honeywell HE280C and Lennox Surelight


Long time lurker and needing some help here. I want to bypass the He280c transformer and hook it up directly to the furnace controller, but only have the humidifier solenoid valve kick in when the heat turns on. I know I have to connect the 2 blue connectors inside the pressure switch box together to by pass the pressure switch as well.

I have the humidstat hooked up to the humidifier as well to manage the the humidity level. Where do I wire the connectors from the transformer box to the furnace controller so when the heat kicks in, the humidifier is powered up?

Old 12-07-20, 10:01 PM
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Welcome to the forums.

Lennox Surelight is a generic board name.
I need the board part number.

This is Surelight board. It has a 120v HUM terminal. If your board is similar you will need to connect your 24v transformer to the HUM and any available Neutral terminal. All five terminals are the same.

If it has 24vac HUM you can use that and C on the wiring connection terminal strip.

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