Nest Thermostat Gen 4 & HRV Wiring

[Etto]

I have a Lennox Healthy Climate HRV system (model HRV5-200-TPD-GDX). Currently, three wires (red, black, and green) are connected to the RED, YEL, and GRN terminals on the HRV. I read in another post that the HI wire should connect to AQ+ and the RED wire to AQ-, but where should the green wire be terminated? Will this wiring allow the HRV to be controlled by each keypad located in the bathrooms? 

Does anyone have photos of their installation they can share?

[Eitanros]

Hello @Etto, 

Thank you for reaching out to the community. I understand you have questions about the wiring configuration for your Lennox Healthy Climate HRV system and its compatibility with your Nest thermostat 4th Gen. I'm here to help!

To gather more information, please answer the following questions:

• Attach a photo of the current wiring configuration on  the old thermostat.
• If you feel comfortable, please attach a picture of the current wiring of the control board. 

 Please, keep me posted!

Best regards, 

Eitan 

[Etto]

I am not able to find a way to upload my thermostat wiring. I currently have nest 3rd generation installed.

I have the following wired to the thermostate:

Y1 (orange wire): this is for the A/C

G (green)

Rc (red)

W1 (black)

C (blue)

* (brown): for humidifier

My HRV LCD panel base has 3 wires connected to it: red (+), green (-) and black. Those wires are connected to the terminal strip mounted on the exterior of the HRV.

[Eitanros]

Hello @Etto, 

Thanks for the follow-up information. I do appreciate the information you have provided!

Based on the information provided, you may need a Nest thermostat 4th Gen it can be confirmed  only by a  Nest Pro technician.

Since the extra wires you have, can be auxiliary wires. A Nest Pro will be able to determine the correct installation process.

Keep me posted.

Best regards,

Eitan 

[Etto]

I already installed a nest thermostat 4th gen and i want to know how to wire my HRV. This is my thread question. The extra wires are for the AC (Y1) and humidifier (*).

I read in another post that the HRV will be wired to AQ+ and AQ-, did anyone completed this wiring that can share a wiring diagram?

[Eitanros]

Hi @Etto, 

Thanks for the follow-up information.

 Based on the information provided your system may be compatible with the Nest Learning Thermostat (4th generation). However, definitive wiring can only be confirmed by a  Nest Pro technician.

Some HRV wires are not compatible with Nest thermostats, or their auxiliary features may not be labeled in a way that allows for easy integration. A Nest Pro can assess your specific system and provide the most accurate guidance on wiring and functionality.

Keep me posted. 

Best regards, 

Eitan