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ChrisSv · 08-06-2023

I have a geothermal heating and cooling system with two zones. Upstairs I have a Honeywell TH 8320U1008 VISION PRO TH8000 series. It has 7 wires going to it. Downstairs I have a Honeywell TH9421C1004 Vision PRO IAQ. I have a THM5421C interface module...

ChrisSv · 08-07-2023

Thank you for your insight. You comments were very helpful.

ChrisSv · 08-06-2023

Looked at the manual for the interface. I believe the top righthand 5 wires going from the interface to the HZ432 is an output to an input.

ChrisSv · 08-06-2023

Don't know what to tell you. It is a private home. Has worked for 14 years. (Except for some damper motor replacements). I think I will give up the nest idea and just buy a Wi-Fi thermometer so I can keep an eye on things when away. I have to do a lo...

ChrisSv · 08-06-2023

Thank you for your response. On the IRQ module I have a humidifier and a air exchanger connected. They are the red and white wires on the lower left side. The wires on the right side go up to a Honeywell HZ 432 Zone 1. The other thermostat TH8000 Ser...

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