topic Re: Aprilaire thermostat 8363 to be replaced by learning nest thermostat in Nest Thermostats

Aprilaire thermostat 8363 to be replaced by learning nest thermostat

Alkeshc — Fri, 02 Jun 2023 23:48:51 GMT

I have 2 Aprilaire thermostats which control my heat pump air con on 2 levels/floors in my home. I want to replace them with nest learning thermostat. I have wires connected to RC RH G Y W terminals on both the thermostats. Will I need a C connector ? Or I just need to replace the Aprilaire with Nest ?

Re: Aprilaire thermostat 8363 to be replaced by learning nest thermostat

CoolingWizard — Sat, 03 Jun 2023 05:20:35 GMT

@Alkeshc , it looks like there is one more unused conductor tucked on the wall. This unused wire appears to have black insulation color. This wire can be connected to Common at both ends. I always recommend using a C wire.

AC Cooling Wizard

Re: Aprilaire thermostat 8363 to be replaced by learning nest thermostat

Alkeshc — Sat, 03 Jun 2023 06:25:51 GMT

Thanks for the revert @CoolingWizard . If I don’t connect the black wire at both the ends and don’t use a C wire, will the nest still work ?

Re: Aprilaire thermostat 8363 to be replaced by learning nest thermostat

CoolingWizard — Sat, 03 Jun 2023 14:20:55 GMT

@Alkeshc , that depends on your furnace/air handler control board. The Nest Learning thermostat, in many cases, can reach the power common by using the W or Y wire. In the best practices, a wire connected to C and both ends is best

AC Cooling Wizard

Re: Aprilaire thermostat 8363 to be replaced by learning nest thermostat

Alkeshc — Sat, 03 Jun 2023 17:46:02 GMT

Hi @CoolingWizard , thanks for all your help and giving me the courage(lol) to DIY. I just connected the 4 wires (no C wire) and for the moment nest is not showing low battery. If there is any change then I will post here again.

Thanks again for replying to my post.

Re: Aprilaire thermostat 8363 to be replaced by learning nest thermostat

Jenelyn_O — Thu, 08 Jun 2023 00:04:47 GMT

Hi there,

Thanks for reaching out. I'm glad to hear that your Nest Thermostat is no longer encountering power issues. Please feel free to create a new thread if you have any questions or concerns, as we'll be willing to assist you from there. Otherwise, I'll be locking this thread after 24 hours.

I appreciate your help, @CoolingWizard.

Best,

Jenelyn