HVAC

Have HVAC Questions? Ask an HVAC Expert for Answers

Ask an Expert,
Get an Answer ASAP!

HVAC

So I have a Bryant Evolution thermostat with the wires

Customer Question
A-green, B-yellow, C-White, and D-Red...
So I have a Bryant Evolution thermostat with the wires A-green, B-yellow, C-White, and D-Red, along with an unused Blue wire in the back of my thermostat. I want to install a NEST but I don't think it will work. Does anyone have any insight to this being possible?
Submitted: 1 year ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 12 minutes by:
4/30/2016
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22,888
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
Verified
Hello, My name is Billy. It will not work. Your existing thermostat is a "communicating" thermostat just for your system. It is not interchangeable with the nest. Some units are capable of being converted but it would require rewiring at furnace, thermostat and possibly ac. But as it stands it will not work, Billy
Ask Your Own HVAC Question
Customer reply replied 1 year ago
I would like to know how to rewire this at the furnace if possible. Is there a diagram I can follow to allow me to rewire it. I assume it would only use 5 wires to accomplish a reconnection. If that is the case I would like to know how to do it.
Customer reply replied 1 year ago
Had I known I was going to get a proprietary piece of shit wiring interconnection that limits the types of thermostats I would have never agreed to use this device.Marc
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago
The current thermostat "talks" to the system in a regular exchange of information.Fan speed, burners, ac.....it operates the system at its highest efficiency possible. Problem is when you want to change thermostats it does 2 things.. Requires new wiring...and also lowers efficiency.If you supply the furnace model number or take pic of circuit board in furnace I can see if yours can be converted to standard 24v off/on use instead of the communicating operation. Billy
Ask Your Own HVAC Question
Customer reply replied 1 year ago
Thanks Billy, can I just buy another circuit board that would allow me to use a NEST.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago
you may not need to change. Once I see the board or you give me model number I can see if you have the alternate terminals.
Ask Your Own HVAC Question
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago
behind the bottom metal panel that has the peep hole in it. That peep hole is see the board diagnostic light. You would need to remove the bottom panel
Ask Your Own HVAC Question
Customer reply replied 1 year ago
Thanks Billy I will do that in the am.
Customer reply replied 1 year ago
Please do let me know your thoughts.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago
Thank you!On the left side edge of the board....there is a vertical black strip of connections.R,G,Y,W,C etc....can you post pic of that row of terminals please?Then we can get started
Ask Your Own HVAC Question
Customer reply replied 1 year ago
OK Billy here you go! I think you can see it from several angles.
Customer reply replied 1 year ago
Just to let you know I can run a separate set of wires from the control circuit to the NEST as they are only physically separated bye about 10 feet. The controller is directly above the furnace and their is a space to run wires. I would just as soon leave the old ones in place in case I need to go back.Marc
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago
Excellent pics, and I thank you.I see a black wire on R and one on G. This would appear there is a switch to run blower only...?Is this something that would remain? It would be redundant as the new thermostat should have a fan "on" switch. Tell me about those 2 black wires and we can get this done pretty easily.
Ask Your Own HVAC Question
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago
did you track the 2 black wires yet?
Ask Your Own HVAC Question
Ask BillyHvac Your Own Question
BillyHvac
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22,888
22,888 Satisfied Customers
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics

BillyHvac is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future.

JimmyBagley, IA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Phil

Phil

Mechanical Engineer

6,938 satisfied customers

Retired HVAC/ Electrical & Boiler contractor. Industrial

Rick Mather

Rick Mather

HVAC Technician

3,133 satisfied customers

35 years experience, HVAC

Matthew

Matthew

HVAC Technician

2,014 satisfied customers

14 years experience in the HVAC field of service, installation, Manual J & D calculations

Kenton Guidry

Kenton Guidry

HVAC Technician

963 satisfied customers

12 years install/service experience.

Brian HVAC Guy

Brian HVAC Guy

HVAC Technician

953 satisfied customers

I have been an HVAC/R mechanic/technician for 30+ years.

Rick Ridley

Rick Ridley

UK Heating Engineer

871 satisfied customers

Retired But have had 30 years on the tools, Ex CORGI

Tom

Tom

HVAC Technician

770 satisfied customers

16+yrs HVAC/R service. Residential Commerical Industrial

< Previous | Next >

Related HVAC Questions
Xrv95 trane furnace. Power to unit, fuse ok, transformer ok,
xrv95 trane furnace. Power to unit, fuse ok, transformer ok, Circuit breaker ok. Power to furnace. Changed thermostat batteries. Problem is fan will not run even in on position. No heat. No codes, no … read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
Xrv95 trane furnace. Power to unit, fuse ok, transformer ok,
xrv95 trane furnace. Power to unit, fuse ok, transformer ok, Circuit breaker ok. Power to furnace. Changed thermostat batteries. Problem is fan will not run even in on position. No heat. No codes, no … read more
Certified HVAC Service Technician
Certified HVAC Service Technician
Welder
Vocational, Technical or Trade School
2 satisfied customers
My carrier furnace says secondary voltage fuse is open. I
My carrier furnace says secondary voltage fuse is open … read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
After installing a new thermostat the furnace has stopped
After installing a new thermostat the furnace has stopped working. I have tried to reset it but the burners and blower will no longer start. I have a 9 year old Carrier Model #58STA/STX. … read more
BillyHvac
BillyHvac
Journeyman HVAC Tech
22,888 satisfied customers
I changed my thermostat and then put the original back nd
I changed my thermostat and then put the original back nd not it will not light up at all … read more
Gaztech
Gaztech
Technician
Vocational, Technical or Trade School
1,142 satisfied customers
Just changed thermostat batteries and ac will not come on.
just changed thermostat batteries and ac will not come on … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
Need a technician who knows about vaillant hot water boiler.
Need a technician who knows about vaillant hot water boiler. … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
What is the differencebetween a heat pump and a hot water
What is the differencebetween a heat pump and a hot water boiler when installing a thermostat … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
I would like to use Honeywell Focuspro 6000/TH6220D1028 for
I would like to use Honeywell Focuspro 6000/TH6220D1028 for my Durozone SMZ-2SW heating/cooling system. Please help me wire it correctly for zone 1.… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
I have carrier c48175d. changed thermostat to honeywell.
i have carrier c48175d. changed thermostat to honeywell. carrier shows green to A yellow to B white to C and red to D. … read more
BillyHvac
BillyHvac
Journeyman HVAC Tech
22,888 satisfied customers
Furnace keeps cutting out. Changed thermostat, igniter and
Changed thermostat, igniter and lame rod and filter. Also sucked water out or pressure switch … read more
Regan Land
Regan Land
General Manager
Vocational, Technical or Trade Scho
508 satisfied customers
I have a high eff gas heating system. Changed thermostats
I have a high eff gas heating system. Changed thermostats and fan is on all the time with no heat … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
I changed thermostats and now I can't get my AC to kick on.
I changed thermostats and now I can't get my AC to kick on. The blower blows but the condenser outside doesn't run.… read more
BillyHvac
BillyHvac
Journeyman HVAC Tech
22,888 satisfied customers
We changed thermostat to old fashioned Honeywell. Now we
We changed thermostat to old fashioned Honeywell. Now we have no power to unit. … read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
6,938 satisfied customers
I hae a reznor v3 tcore2 that I tried to change thermostat
I hae a reznor v3 tcore2 that I tried to change thermostat and now it will not fire up. … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Changing thermostat from mercury to thought I hooked wires
Changing thermostat from mercury to thought I hooked wires up but it won't work … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
When changing thermostat, which wires attach to which?
Hi, I am trying to change out my thermostat. I need help determining which wires to attach to which wires when I change out the thermostat. Power is off and I have taken a picture of the old setup of … read more
BillyHvac
BillyHvac
Journeyman HVAC Tech
22,888 satisfied customers
Furnace doesn't work after changing thermostat, I'm pretty
I'm pretty sure I shorted something when installing the nest … read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
6,938 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x