Had my system replaced last summer. When they hooked up the humidifier, they just went to the transformer output for power. Now anytime humidity is below the set point, the water runs even if the system is off. Doing some research I found out this unit has HUM terminals. How do I connect my humidifier to the s9v2 HUM terminals? I put a multi-meter across the terminals to see if its 120v or 24v but just get 0v. This was measured during a call for heat and with no call. Am I measuring correctly? Or is it from one terminal to somewhere else?
Model number S9V2B060U3PSAAA