Nest Gen 3 and Generalaire 570M


Old 07-06-19, 02:23 PM
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Nest Gen 3 and Generalaire 570M

Nest 3rd gen tstat
Generalaire 570m humidifier
Generalaire MHX3C humidistat
EWC NCM-300 Zone control
EWC Damper

I ​​​​​have a Gen 3 Nest thermostat I want to control the humidifier with, but the MHX3C humidistat (when I popped of the cover) has two wires running into an internal relay (I think). My solenoid on the humidifier has two blue wires connected to blue wires with heatshrink somewhere I can't see.

My control board's datasheet:
Humidifier datasheet:

The control board has it's R and C connections under the label 24V T-FORMER going somewhere.
My current non nest t-stat has a common wire and a Rh wire. W1/W2 and a G connection. It's wiring is going to the connections under SYSTEM on the control board.

The wires in ZONE 1 MOTOR are going to an EWC Damper with red, blue, and black wires in connection 1, 4, and 6 respectively (I think).

​how do I connect my humidifier to a nest?

Last edited by SABRE45; 07-06-19 at 05:14 PM.
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