Replace old thermostat with Nest 3rd Generation. The devices most commonly called “smart thermostats”, such as thermostats from Nest, Ecobee, Honeywell, etc., are only compatible with “low voltage” 24v HVAC systems. I would like to replace my old honeywell thermostat by a nest gen 3. A-B-C connection points are left not connected. Could any of you give me some guidance on how to replace my Honeywell T6360B thermostat to a Nest thermostat. Replace old thermostat with Nest 3rd Generation. i tried to replace my old Honeywell 921 thermostat with new one, but the old connection between the Relay Box BDR91 is not correct. As a birthday gift, my wife bought me a new Nest thermostat and she expects me to replace our 2015 model Honeywell TH8000 Vision Pro with the Nest. 1. Problem: phone didn't save the - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. I have the Honeywell set up on a good schedule to control the heat pump and electric auxiliary heat. Hi Yea literally just the manual thermostat. You should be certain that your HVAC is compatible before you try to hook up a smart thermostat. Thanks. This will help you out when connecting the wiring on the new thermostat. I am replacing Honeywell thermostat with Nest E thermostat. Posted by 3 years ago. Mehmet, Nov 11, 2019 #1. kiaora Screwfix Select. Honeywell T87 Honeywell Pro 3000 Honeywell Pro 4000 Honeywell Pro 8000 White Rodgers 1F89-211 Nest 3rd Generation Thermostat You should always pay attention to your original wiring, how each color is on a separate terminal. Total project time: About 30 minutes. 2) how to wire the 2 actual wires Attached Files: 76E183A9-F615-4279-875E-40C755FBB1F6.jpeg File size: 436.7 KB Views: 8. Archived. Has anyone had this issue? Currently we replaced that thermostat with tado, however it's not great and I want to use Nest instead. The That’s why I wanted to change it to the nest one so I can set it up to come on at certain times etc just wasn’t sure it I can simply remove the old one and connect the new one with the wires that were there. There is only 2 wires. The Nest thermostat and Nest app will show you system status information without connecting L wires. I have a Grant Vortex Combi 21e and the current stat is connected via terminal blocks 25 & 26. Nest thoughtfully provides one with the thermostat, though you may need a smaller screwdriver to remove the wires from your old thermostat. my boiler type is Ideal logic 24. 1) is it possible to replace ? Trying to replace old Honeywell T8575D2003 with Google Nest First Generation Thermostat. Thermostatic Controls - Changing an Old Honeywell T6069A to a Google Nest 3rd Gen - Hey guys, I am wondering if I can replace my old Honeywell T6069A thermostat to a Google Nest 3rd Generation. Can someone provide a wiring diagram. Nest E does not have a W2 connection and suggests I have it installed professionally. would you please help to show me how to connect the Relay Box to the boiler. Honeywell wiring is Y1, G, R, W2, C and OB. Close. I would like to save the money and install myself. I have the Honeywell T6360B thermostat and a Rayburn boiler. 4.