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Help with 6 wires installation

Ladyv4real2003
Community Member

I have a nest 3rd generation thermostat and my house has six wires. Yellow in Y1, Green in G, Orange in OB, White in W, Blue in C, and Red in RH. What am I doing wrong I keep getting either no cool setting or wiring or power issue. Please help. Thanks in advance 

1 Recommended Answer

CoolingWizard
Platinum Product Expert
Platinum Product Expert

Yellow Wire goes to Y1

Black Wire goes to C

Red Wire goes to Rc

Green Wire goes to G

Orange wire goes to O/B*

White wire goes to W2/AUX

When comes the testing your system at the end of the installation, run the Heating test. See if your get Heat. Then you must wait 5 minutes minimum before testing the cooling.  Now if your Heat test blows cool air, then the reversing valve (the O/B) mode needs to be changed.  The  O model heat pumps are heaters  by default and you have to energize the reversing valve (OB wire)  in order to get cooling. Conversely, B model heat pumps are air conditioners by default, and you must energize the reversing valve (OB ) to get heating.

I hope this helps,

The AC Cooling Wizard

NestPro, Google Pro, Mechanical Engineer and HVAC service company owner.
If my answer solved your problem, click Recommend this Answer below, and If it helped you, please give a Kudo.

View Recommended Answer in original post

7 REPLIES 7

CoolingWizard
Platinum Product Expert
Platinum Product Expert

With Heat Pumps, the preferred location of the Power-input is Rc. Make sure your wires are stripped back enough to get fully inserted into the Nest baseplate. With heat pumps keep in mind that they come in two flavors so to speak. They  are called O models or B models. O models are heat models and the OB wire gets energized to get Cooling. On B models it is the opposite. They are cooling and must Energize the OB wire to get heat. 

I hope this information helps.  

The AC Cooling Wizard

NestPro, Google Pro, Mechanical Engineer and HVAC service company owner.
If my answer solved your problem, click Recommend this Answer below, and If it helped you, please give a Kudo.

CoolingWizard,

What are your wiring recommendations for nest 3rd generation thermostat based on the cables above, the system uses a heat pump on? I have included a screenshot of what I think would be my setup but I'm not a 100% certain.

 Screenshot_20230327_202650_Home.jpg

20220911_201158.jpg 

CoolingWizard
Platinum Product Expert
Platinum Product Expert

Yellow Wire goes to Y1

Black Wire goes to C

Red Wire goes to Rc

Green Wire goes to G

Orange wire goes to O/B*

White wire goes to W2/AUX

When comes the testing your system at the end of the installation, run the Heating test. See if your get Heat. Then you must wait 5 minutes minimum before testing the cooling.  Now if your Heat test blows cool air, then the reversing valve (the O/B) mode needs to be changed.  The  O model heat pumps are heaters  by default and you have to energize the reversing valve (OB wire)  in order to get cooling. Conversely, B model heat pumps are air conditioners by default, and you must energize the reversing valve (OB ) to get heating.

I hope this helps,

The AC Cooling Wizard

NestPro, Google Pro, Mechanical Engineer and HVAC service company owner.
If my answer solved your problem, click Recommend this Answer below, and If it helped you, please give a Kudo.

Thank you

 

EmersonB
Community Specialist
Community Specialist

Hi everyone,

@Ladyv4real2003, thanks for reaching out here in the Community. How's it going with your Nest Thermostat? Were you able to read the information that CoolingWizard has shared? In case you have an update, you know where to find us.

 

@PC_Mod, I wanted to follow up and see if you are still in need of any help. Please let me know if you are still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.

I appreciate the help, CoolingWizard.

Regards,
Emerson

PC_Mod
Community Member

So far so good and everything is working fine!

Jenelyn_O
Community Specialist
Community Specialist

Hi there,

 

Thanks for the update! I'm glad that the issue is now resolved. If you have any questions or concerns, please feel free to create a new thread, as I'll be locking this thread after 24 hours. 

 

Best,

Jenelyn