Hello, I have a Carrier 58MVC furnace with 2 stage heat pump. It is controlled with the Infinity control thermostat, I currently have a Honeywell TrueSteam humidifier installed in the following configuration: I am looking to get rid of the TrueSteam (piece of junk!) and go to an Aprilaire 800. However, I am not sure how to wire the control wiring. The 800 only has two HUM terminals (humidistat), which I'm pretty sure go to the contact side of the existing relay (the 800 has dry contacts like the TrueSteam does). There are no other control connections on the 800 that I'm aware of. So I do not know where I would connect the R and C wires from the furnace. Do I need the R and C wires connected to the Aprilaire 800? If so, not sure where they would go. What do the R and C connections do on the TrueSteam? Any input is appreciated.

Hi, my friend helped me to install this Honeywell HE360 whole house humidifier 4 years ago. It has been working for the past 3 years. A few weeks ago, the weather got cold so the furnace started to run so as the humidifier. I noticed that constant clicking sound came out of the humidifier. Whenever the clicking sound occurred, the fan would stop and start running. I did see water came out so I do not think the problem is the valve. I thought that might be the control board, so I ordered a new one to replace the old one. But the issue still exist so I put the old control board back. I am still figuring out what the issue is. If anyone can give me advice, I would really appreciate that.