How JustAnswer Works:

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

Ask Kenton Guidry Your Own Question

Kenton Guidry
Kenton Guidry, HVAC Technician
Category: HVAC
Satisfied Customers: 966
Experience:  12 years install/service experience.
15860845
Type Your HVAC Question Here...
Kenton Guidry is online now
A new question is answered every 9 seconds

Honeywell TH8000 install

Customer Question

I am replacing my Honeywell Chronotherm III with a Honeywell TH8000.

The wall plate of the Chrom III is wired as follows
top row (8 terminals/slots)
#1 - Empty
#2 - Red
#3 - Green
#4 & 5 - Empty
#6 - Purple
#7 & 8 Empty

3 Row 8 terminals/slots
#1 thru 4 Empty
#5 - Black
#6 - White
#7 - Orange


5 Row 1 terminal/slot
#1 - Green

I am not sure which wires from the scheme above go to what terminals on the TH8000
Submitted: 5 years ago.
Category: HVAC
Expert:  Mark Henley replied 5 years ago.

Hi,

 

Are there any letter designations on the existing stat's terminals ?

 

The numbers and rows don't tell us enough.

 

Thank you,

 

Mark..

 

 

 

Customer: replied 5 years ago.

On the Chromotherm III no there are no or designations

On the TH8000 there are:

 

On the left (facing the wall plate) Interior and exterior terminals

S1

S2

 

On the right (facing the wall plate) left interior top to bottom (I believe this is for conventional)

RC

R

W

Y

G

C

 

On the exterior of the terminal block (I believe this is for Heat Pump which I have)

RC

R

O/B

Y

G

C

 

Over the top of the left and Right terminal block are Arrows indicating the exterior is "Heat Pump" (which I have) and arrows to the interior of the terminal block indicating "Conventional."

Customer: replied 5 years ago.
Hold it - I found some designations on the Chornotherm. The light is poor - I will be back in a minute with corrections
Expert:  Mark Henley replied 5 years ago.

Hi,

 

I'm going to hand it off to another expert as I am short on time.

 

 

Thank you,

 

Mark.

Customer: replied 5 years ago.
Does this mean I pay again?
Expert:  Mark Henley replied 5 years ago.

No,

 

Not at all,

 

You haven't actually paid until you hit the accept button. Once you are satisfied with the answer.

 

Thanks

 

Mark.

Customer: replied 5 years ago.

Okay - Should I wait until the next expert come on?

 

Expert:  Mark Henley replied 5 years ago.
Yes, will be just a couple minutes.
Expert:  Mark Henley replied 5 years ago.

Hi,

 

Go ahead and post the terminal designations, he will need them.

 

 

 

Thanks,

Expert:  Kenton Guidry replied 5 years ago.

Hi, I think that I can help you. can you please tell me the wire colors you were using originally?

 

Typically you will use the following.

R - Red wire - 24v power

C - - 24v common/ground

Y- Yellow wire - First stage cooling

W - White wire - First stage heating

G - Green wire - Indoor fan

O/B - - Solenoid valve

Expert:  Kenton Guidry replied 5 years ago.

I found the following on the Honeywell website, page 3. The link for the manual is http://customer.honeywell.com/TechLit/pdf/PackedLit/69-1896ES.pdf

 

 

 

Heat Pump Terminal Letters:

R Heating power. Connect to secondary side of heating system transformer.

Rc Cooling power. Connect to secondary side of cooling system transformer.

C Common wire from secondary side of cooling system transformer.

Y 1st stage compressor contactor.

Y2 2nd stage compressor contactor.

Aux Auxiliary heat relay.

G Fan relay.

E Emergency heat relay.

L Heat pump reset (powered continuously when System is set to Em Heat; system monitor when set to Heat, Cool or Off).

O/B Changeover valve for heat pumps.

S1 Optional outdoor or remote sensor.

S2 Optional outdoor or remote sensor.

Customer: replied 5 years ago.

Okay - I took another look at the Chronotherm III and here is what I found

 

R Terminal - Red wire

B Terminal - Blue wire

Y Terminal - Yellow wire

 

E Terminal - Black wire (Black is jumper between E Terminal and W2)

 

W2 Terminal - White Wire & Black Wire (Black is jumper between E Terminal and W2)

 

G Terminal - Green wire.

 

On the TH8000 there is a jumber between RC and R - the manual says "Remove factory installed jumper ONLY for two-transformer systems."

 

How do you know if you have a two-transformer system?

Customer: replied 5 years ago.

One more

After the

W2 Terminal - White Wire & Black Wire (Black is jumper between E Terminal and W2)there is another terminal O terminal - Orange wire.

 

 

 

Expert:  Kenton Guidry replied 5 years ago.

You know I cannot say I have ran across very many units that have a two transformer system. There are a few ways you can tell if you have more than one transformer. One is to visibly look behind the panels. Another is to look at your wiring diagram. From your first post it doesn't look like you have a two transformer system. R

Expert:  Kenton Guidry replied 5 years ago.
The jumper is there because you only have one power supply coming in for both heating and cooling.
Customer: replied 5 years ago.

Okay

 

I believe I am getting this

R terminal = Red wire

Y terminal = Yellow wire

G terminal = Green wire

O/B terminal = Orange wire

 

But what about the C terminal on the Chromotherm III with blue wire to what does that connect on the TH8000?

 

 

Expert:  Kenton Guidry replied 5 years ago.
C would be your common 24v wire. That would go to C as well.
Kenton Guidry, HVAC Technician
Category: HVAC
Satisfied Customers: 966
Experience: 12 years install/service experience.
Kenton Guidry and 4 other HVAC Specialists are ready to help you
Customer: replied 5 years ago.

I forgot to ask about the white wire. On the TH8000 there is a terminal W but it appears to be the same terminal as O/B.

 

I have a white wire and an orange wire on my old thermostat (chronothem III)

Expert:  Mark Henley replied 5 years ago.

Hi,

 

Connect W from the old stat to the AUX on new stat.

 

Thank you,

 

Mark.

Customer: replied 5 years ago.

I am afraid I don't see an AUX - unless it it the S1 or S2 for interior or exterior temp

 

Expert:  Mark Henley replied 5 years ago.

Hi,

Do you have an E? These are usully on the left hand side.

 

 

What is the exact model of stat you have?

 

Mark

Customer: replied 5 years ago.
No E
Expert:  Mark Henley replied 5 years ago.

Hi,

 

If you look on the back of the stat it will have the model number on it. I need the full model number.

 

Thanks,

 

Mark

Expert:  Mark Henley replied 5 years ago.

Hi

 

I think what has happened is that you have a stat that is only one heat and one cool. If that is the case , do you know if you have an electric heat bank on your furnace ?

 

Did they ask you if you had more than one satge of heat where you bought the stat ?

 

 

Thanks,

 

Mark.

Customer: replied 5 years ago.

old one The Chronotherm III -- T8611G1103 a horizontal 1 new line 9302

 

new one The TH8000 series - TH8110U002

Customer: replied 5 years ago.

electric heat bank on your furnace? How would I know?

 

Did they ask you if you had more than one satge of heat where you bought the stat? I bought it on line - it said it would work, and since I was replacing a honeywell with a honeywell I thought it would be alright.

Expert:  Mark Henley replied 5 years ago.

Hi,

 

That's what I was afraid of. That is a one stage heat and one stage cool stat. That means there is no means of turning on your auxillary heating. If you know for sure that you have electric heat banks in your air handler you won't be able to use this thermostat. If you don't then you don't need the white wire.

 

To stick with the Honeywell you need a two stage heat and one cool stat, this model number will do it.

 

TH8320 or TH8321,

 

 

There are others also but these are in the same series as the one you have.

 

Thanks,

 

Mark.

Expert:  Mark Henley replied 5 years ago.

Hi,

 

Unfortunately they didn't ask you enough questions about your system when ordering the stat.

 

More than likely you do have at least one bank of electric heat. The easiest way to check is to open the front panel of the unit and look for some thicker wires that will be connected to some heating element terminals.

 

Thanks,

 

Mark.

Customer: replied 5 years ago.

I know that when the AC is running in the summer the unit (it is a TRANE) outside the house runs as well as the air handler in the house. The same is true when in the winter the unit outside runs and the air handler on the inside runs. What would that mean?

Expert:  Mark Henley replied 5 years ago.

Hi,

 

You may not know when the electric heat bank is coming on but basically the first time of the year that it fires up you will get a burning dust smell , do you ever get that ?

 

Thanks

 

Mark.

Customer: replied 5 years ago.
No smell.
Expert:  Mark Henley replied 5 years ago.

Hi,

 

The there is a possibility that you don't have auxillary heat. What climate are you in ?

 

Thanks

 

Mark.

Customer: replied 5 years ago.
Pensacola - North West Florida. Maybe once or twice a winter it will get below 30 degrees. Rarely ever get to 25 or lower.
Expert:  Mark Henley replied 5 years ago.

Hi,

 

Well you could make a plan that you will just cap off the white wire and let it go until the next time you have a service done on your system and then ask the tech how many banks of heat you have. I still think you are going to have one stage of it but it may have only been used for an emergency heat back up and dedicated as just an auxillary.

 

Thank you,

 

Mark

Customer: replied 5 years ago.
Okay
Customer: replied 5 years ago.

On the old Stat

E Terminal - Black wire (Black is jumper between E Terminal and W2)

W2 Terminal - White Wire & Black Wire (Black is jumper between E Terminal and W2)

 

On the new one there is not E or W2 - however on the back of the stat control unit the circurit board does have printed on the board an E and a W2 - Aux. But there is no pin that would fit into the wall mount.

 

I will wait until I have the unit checked.

Expert:  Mark Henley replied 5 years ago.

Hi,

 

Yes , they use the same base board for all the thermostats in that series. The amount of stages needed only causes them to change the front of it. I guess it's more profitable for them that way.

 

And on the flip side of that , most heat pumps get the aux and emergency wires ran from the stat to their air handler whether they actually have them or not. So you may still not have them. We'll have to wait until we get a set of eyes on them.

 

Thanks

 

Mark.

 

 

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. Jimmy Bagley, IA
< Last | Next >
  • 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. Jimmy Bagley, 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!!!! Alex Los 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. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, 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. Esther Woodstock, 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. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • gotoman for ac

    HVAC Technician

    Satisfied Customers:

    4657
    51 years of experience install design and repair of all makes and models of AC
< Last | Next >
  • http://ww2.justanswer.com/uploads/SE/ServiceTechRus/2012-6-7_2119_056.64x64.JPG gotoman for ac's Avatar

    gotoman for ac

    HVAC Technician

    Satisfied Customers:

    4657
    51 years of experience install design and repair of all makes and models of AC
  • http://ww2.justanswer.com/uploads/AL/alumalite/2012-5-10_234018_shutterstock506249951forJA500.64x64.jpg Phil's Avatar

    Phil

    Mechanical Engineer

    Satisfied Customers:

    3888
    Retired HVAC/ Electrical & Boiler contractor. Industrial
  • http://ww2.justanswer.com/uploads/skibum0101/2008-12-16_015819_just_answer.jpg Rick Mather's Avatar

    Rick Mather

    HVAC Technician

    Satisfied Customers:

    3132
    35 years experience, HVAC
  • http://ww2.justanswer.com/uploads/RY/Rygis20/2011-5-7_3143_DSC5324.64x64.JPG Matthew's Avatar

    Matthew

    HVAC Technician

    Satisfied Customers:

    1994
    14 years experience in the HVAC field of service, installation, Manual J & D calculations
  • http://ww2.justanswer.com/uploads/KE/kentguidry/2011-9-26_214316_0059.64x64.jpg Kenton Guidry's Avatar

    Kenton Guidry

    HVAC Technician

    Satisfied Customers:

    962
    12 years install/service experience.
  • http://ww2.justanswer.com/uploads/solarman1947/2009-12-13_223915_phpkKBcXq_c2PM.jpg Rick Ridley's Avatar

    Rick Ridley

    UK Heating Engineer

    Satisfied Customers:

    871
    Retired But have had 30 years on the tools, Ex CORGI
  • http://ww2.justanswer.com/uploads/Ironheadfan/2009-12-18_222416_pump_005.jpg Tom's Avatar

    Tom

    HVAC Technician

    Satisfied Customers:

    770
    16+yrs HVAC/R service. Residential Commerical Industrial