 |
|
|
 |
New Member
|
|
Oct 5, 2007, 04:51 PM
|
|
Old thermostat wiring
Hi, I bought a new thermostat(programmable Honeywell RTH230B). My old one is also a Honeywell, really old round one. I couldn't see the color of the wires through the plate. I had to take the plate off which meant disconnecting the wires. So when I took the plate off, I could not tell where the wires had connected. I have 4 wires, blue, green, red and white(I assume it's white, its so old and discolored it's hard to say.) The new therm needs a white, yellow, green, rh and rc. I called Honeywell and they said that they couldn't help me if I couldn't tell them where the wires were connected on the old therm. I really would like to get this connected. Its 88 degrees and I'm in a second floor condo. It's hot.
I really don't want to call someone to do it. I was so proud of myself when I bought it. I refuse to give up and be a dumb female.
|
|
 |
Ultra Member
|
|
Oct 5, 2007, 05:38 PM
|
|
Hi! At the beginning of this forum you will find "stickys".. They are questions and answers posted so you may find some help there... Try there first. There is information as to where the wiring on a thermostat SHOULD go.
Good luck
|
|
 |
Heating & Air Conditioning Expert
|
|
Oct 5, 2007, 05:39 PM
|
|
 Originally Posted by kathyt
Hi, I bought a new thermostat(programmable Honeywell RTH230B). My old one is also a Honeywell, really old round one. I couldn't see the color of the wires through the plate. I had to take the plate off which meant disconnecting the wires. So when I took the plate off, I could not tell where the wires had connected. I have 4 wires, blue, green, red and white(I assume it's white, its so old and discolored it's hard to say.) The new therm needs a white, yellow, green, rh and rc. I called Honeywell and they said that they couldn't help me if I couldn't tell them where the wires were connected on the old therm. I really would like to get this connected. Its 88 degrees and I'm in a second floor condo. It's hot.
I really don't want to call someone to do it. I was so proud of myself when I bought it. I refuse to give up and be a dumb female.
Here is the link for your thermostats wiring diagram.
You will probably need to jumper r and rh if you have a single transformer.
Blue wire is probably the signal circuit for the outside A/C unit so it will be Y on your new stat.
http://customer.honeywell.com/techli...0s/69-1800.pdf
|
|
 |
Ultra Member
|
|
Oct 5, 2007, 05:40 PM
|
|
The rule of thumb, if the first stat was wired correctly is red wire to R,, white wire to W or RH,, green wire to G,, and the blue wire or should be yellow goes to Y on your stat,does you new honewell have a built in factory jumper from RH to RC,many do,, read the paper work it should say if the stat needs a jumper from RH to RC., you may need to look on the other end of stat wires in your furnace and see what each color is hooked to, probably the blue is going to A/C
|
|
 |
Uber Member
|
|
Oct 5, 2007, 06:07 PM
|
|
If you checked the sticky as Missouri bound suggested, you may have had it going before the others posted. Northern Heat did a fine job on it, great resource. Another vote for the blue to go on the yellow. When in doubt, go to the furnace and see where things are connected. You need a pair of wires from the Y terminal of the thermostat and the common at the furnace out to the coil of the compressor contractor.
|
|
 |
New Member
|
|
Oct 5, 2007, 06:28 PM
|
|
 Originally Posted by wmproop
the rule of thumb,,if the first stat was wired correctly is red wire to R ,,,white wire to W or RH ,,,green wire to G,,,,and the blue wire or should be yellow goes to Y on your stat,does you new honewell have a built in factory jumper from RH to RC,many do,,,read the paper work it should say if the stat needs a jumper from RH to RC.,,,you may need to look on the other end of stat wires in your furnace and see what each color is hooked to,,probably the blue is going to A/C
There is a built in factory jumper from RH to RC. So what do I do with the red wire?
|
|
 |
Heating & Air Conditioning Expert
|
|
Oct 5, 2007, 06:33 PM
|
|
Land the red wire one one or the other RH or RC. It does not make a difference since they are jumpered.
|
|
 |
New Member
|
|
Oct 5, 2007, 06:39 PM
|
|
 Originally Posted by hvac1000
Land the red wire one one or the other RH or RC. It does not make a difference since they are jumpered.
Thanks, I'm going to try. Wish me luck!
|
|
 |
Heating & Air Conditioning Expert
|
|
Oct 5, 2007, 07:32 PM
|
|
Good luck I hope it works out for you.
|
|
 |
Uber Member
|
|
Oct 5, 2007, 08:05 PM
|
|
''# R (red) or Rh (Red heat) 24 volts from equipment.
# Rc (Red cooling) 24 volts from transformer in cooling equipment.''
The information you needed was right in the sticky that 2 of us pointed you to.
It also showed blue as an alternative to yellow.
|
|
 |
Ultra Member
|
|
Oct 5, 2007, 10:23 PM
|
|
 Originally Posted by wmproop
the rule of thumb,,if the first stat was wired correctly is red wire to R ,,,white wire to W or RH ,,,green wire to G,,,,and the blue wire or should be yellow goes to Y on your stat,does you new honewell have a built in factory jumper from RH to RC,many do,,,read the paper work it should say if the stat needs a jumper from RH to RC.,,,you may need to look on the other end of stat wires in your furnace and see what each color is hooked to,,probably the blue is going to A/C
The RC and RH is for if you have a two transformer system. If you hook the white to the RH with the jumper in place your heat will never shut off.
|
|
 |
New Member
|
|
Oct 6, 2007, 05:33 AM
|
|
 Originally Posted by labman
''# R (red) or Rh (Red heat) 24 volts from equipment.
# Rc (Red cooling) 24 volts from transformer in cooling equipment.''
The information you needed was right in the sticky that 2 of us pointed you to.
It also showed blue as an alternative to yellow.
Again, I don't know what any of that means!!
|
|
 |
Ultra Member
|
|
Oct 6, 2007, 07:05 PM
|
|
 Originally Posted by kathyt
Hi, I bought a new thermostat(programmable Honeywell RTH230B). My old one is also a Honeywell, really old round one. I couldn't see the color of the wires through the plate. I had to take the plate off which meant disconnecting the wires. So when I took the plate off, I could not tell where the wires had connected. I have 4 wires, blue, green, red and white(I assume it's white, its so old and discolored it's hard to say.) The new therm needs a white, yellow, green, rh and rc. I called Honeywell and they said that they couldn't help me if I couldn't tell them where the wires were connected on the old therm. I really would like to get this connected. Its 88 degrees and I'm in a second floor condo. It's hot.
I really don't want to call someone to do it. I was so proud of myself when I bought it. I refuse to give up and be a dumb female.
I agree we can make things complicated here at times. Try it this way (its just a stab in the dark because I can not see how your unit is wired) Blue to Y, Green to G, White to W, Red to RC or RH. If you have a jumper wire from RH to RC keep it in place.
|
|
Question Tools |
Search this Question |
|
|
Add your answer here.
Check out some similar questions!
Thermostat Wiring Help
[ 10 Answers ]
I'm replacing my thermostats with Honeywell Chronotherm IV Model 8600 (power stealing) and having some trouble with wiring. I have five thermostat wires coming out of the wall - red, white, green, blue and yellow. I have a 24 volt system with gas forced air and central a/c. All components are...
Thermostat Wiring - From Two to One Thermostat
[ 4 Answers ]
Currently my central a/c unit is hooked up to a Honeywell CT3500 Programmable Thermostat. I've noticed that the thermostat can handle heat as well as cooling. My furnace is hooked-up to an older manual thermostat. It is a simple 2 wire set-up - red & white. Could the furnace be hooked-up to the...
Thermostat Wiring
[ 2 Answers ]
Hello
I bought a Noma Programmable Therm. Model 52-2549-0 and installed it in the winter.
The Furnace worked fine, but now I tried the AC and no go.
I have 4 wires. 1 set in a Green Insulation around a Red and Black wires and the other 2 wires are white and black.
Here is how it is...
Thermostat Wiring Help
[ 2 Answers ]
I'm new to putting in a thermostat or working on anything like this, so please bear with me. I really appreciate any help you can give me with my problems. Ok, I have a thermostat that has only three wires attached to it. It has a red wire, a black wire, and a white wire. I have no clue ehat...
Wiring the whole thermostat?
[ 2 Answers ]
Without realizing what I did I removed the old manual thermostat, and paid no attention to the wires locations on the thermostat before doing so .so I'm stuck with two yellows one red one blue one green and a black wire that's not been used ?
How do I determine which wire goes where?
View more questions
Search
|