Original message
| Coburn
 |  "Installation problem CT8775C"
, posted Sun 27 Jun 15:52  
I removed a White-Rodgers Thermostat control and am attempting to install a Honeywell CT8775C control. I get the fan to kick on but no cooling. My central system consists of a Trane unit which is not a heat pump unit. The furnace is natural gas fired. The wires coming out of the wall are B, W, R and G no yellow. The White-Rodgers control had a built-in yellow wire. Can you please assist.
I removed a White-Rodgers Thermostat control and am attempting to install a Honeywell CT8775C control. I get the fan to kick on but no cooling. My central system consists of a Trane unit which is not a heat pump unit. The furnace is natural gas fired. The wires coming out of the wall are B W R and G no yellow. The White-Rodgers control had a built-in yellow wire. Can you please assist.
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Replies:
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| Coburn
| "Re(1):Installation problem CT8775C" , posted Sun 27 Jun 16:47
After about ten minutes, the system kicked on and is now appears to be cooling. The B wire is taped off and only the R with jumper to Rc is connected as well as the W and G wires.
I removed a White-Rodgers Thermostat control and am attempting to install a Honeywell CT8775C control. I get the fan to kick on but no cooling. My central system consists of a Trane unit which is not a heat pump unit. The furnace is natural gas fired. The wires coming out of the wall are B W R and G no yellow. The White-Rodgers control had a built-in yellow wire. Can you please assist.
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| Xenos
Webmaster 
| "Re(1):Installation problem CT8775C" , posted Sun 27 Jun 16:11
B= Common honeywell C or X
W= Heat
R= Power
G= fan
Xenos.
The best way to escape a problem is to solve it.
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| | Coburn
| "Re(2):Installation problem CT8775C" , posted Sun 27 Jun 16:31
There is no X or C terminal to connect my G wire too. I tried taping it off but that didn't work.
I removed a White-Rodgers Thermostat control and am attempting to install a Honeywell CT8775C control. I get the fan to kick on but no cooling. My central system consists of a Trane unit which is not a heat pump unit. The furnace is natural gas fired. The wires coming out of the wall are B W R and G no yellow. The White-Rodgers control had a built-in yellow wire. Can you please assist.
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| | Xenos
Webmaster
| "Re(3):Installation problem CT8775C" , posted Sun 27 Jun 16:34
Jump R to G does the fan stat? if not it's not the thermostat.
Xenos.
The best way to escape a problem is to solve it.
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| | Coburn
| "Re(4):Installation problem CT8775C" , posted Sun 27 Jun 16:41
The fan comes on as I wired it just no cooling kicking in.
I removed a White-Rodgers Thermostat control and am attempting to install a Honeywell CT8775C control. I get the fan to kick on but no cooling. My central system consists of a Trane unit which is not a heat pump unit. The furnace is natural gas fired. The wires coming out of the wall are B W R and G no yellow. The White-Rodgers control had a built-in yellow wire. Can you please assist.
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| | Xenos
Webmaster
| "Re(5):Installation problem CT8775C" , posted Sun 27 Jun 17:03
Ah, follow the wiring and find out what wire is Y. Y is cooling.
Xenos.
The best way to escape a problem is to solve it.
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| | Coburn
| "Re(6):Installation problem CT8775C" , posted Sun 27 Jun 17:14
I knew Y was for cooling but no Y wire coming from wiring in home. I suppose the cooling wire ties into the R junction on the Honeywell unit. I posted to myself while trying to post a second response to you just a bit ago to indicate that the fan is now running in automatic phase but no A/C compressor running yet. This is with the B wire taped off and only the R with jumper to Rc connected along with the W and G wires.
I removed a White-Rodgers Thermostat control and am attempting to install a Honeywell CT8775C control. I get the fan to kick on but no cooling. My central system consists of a Trane unit which is not a heat pump unit. The furnace is natural gas fired. The wires coming out of the wall are B W R and G no yellow. The White-Rodgers control had a built-in yellow wire. Can you please assist.
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| | Xenos
Webmaster
| "Re(7):Installation problem CT8775C" , posted Sun 27 Jun 17:21
We assume R is red W is white… The best solution is follow the wires and see where they go. At the other end you will see what one is connected to Y. Trane uses B for common however maybe in this case it’s Y, don’t attach it to Y until proving it though as it will short out the transformer.
Xenos.
The best way to escape a problem is to solve it.
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| | Coburn
| "Re(8):Installation problem CT8775C" , posted Sun 27 Jun 17:43
I may have confused you further. The Blue wire is connected to a small White wire spliced in the furnace closet coming from the transformer. The other B wire I previously I referred to is Black and a White power source wires powering the transformer. The small Red wire is all alone. On the opposite side of the furnace enclosure are the four wires apparently coming out of the wall from the thermostat control. There are four wires: Blue, Red, White and Green all tied to the same colored wires going into the furnace unit. It turns out that while the compressor is a Trane the furnace heating unit and fan assembly in the closet is a Lennox Elite Series unit.
I removed a White-Rodgers Thermostat control and am attempting to install a Honeywell CT8775C control. I get the fan to kick on but no cooling. My central system consists of a Trane unit which is not a heat pump unit. The furnace is natural gas fired. The wires coming out of the wall are B W R and G no yellow. The White-Rodgers control had a built-in yellow wire. Can you please assist.
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| | Coburn
| "Re(8):Installation problem CT8775C" , posted Sun 27 Jun 17:31
In the furnace closet, they have the blue and white wires tied together with the red wire all alone. I can not find where the blue wire ties in. There are two larger wires B and W going to the 120V power source from the transformer as well. It sounds like I need to tie in the B wire to the Y terminal. No yellow wires exist except the ones that were originally contained within the White-Rodger control.
I removed a White-Rodgers Thermostat control and am attempting to install a Honeywell CT8775C control. I get the fan to kick on but no cooling. My central system consists of a Trane unit which is not a heat pump unit. The furnace is natural gas fired. The wires coming out of the wall are B W R and G no yellow. The White-Rodgers control had a built-in yellow wire. Can you please assist.
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| | Xenos
Webmaster
| "Re(9):Installation problem CT8775C" , posted Sun 27 Jun 17:43
Going to the out door unit there will be 2 wires one is Common the other is Y. can you see these?
Xenos.
The best way to escape a problem is to solve it.
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| | Coburn
| "Re(10):Installation problem CT8775C" , posted Sun 27 Jun 17:47
There are three small wires going into the outside unit. A Red, White and a Blue wire, no Yellow.
I removed a White-Rodgers Thermostat control and am attempting to install a Honeywell CT8775C control. I get the fan to kick on but no cooling. My central system consists of a Trane unit which is not a heat pump unit. The furnace is natural gas fired. The wires coming out of the wall are B W R and G no yellow. The White-Rodgers control had a built-in yellow wire. Can you please assist.
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| | Xenos
Webmaster
| "Re(2):Re(10):Installation problem CT8775C" , posted Sun 27 Jun 17:50
Only 2 will be conected out side.
Xenos.
The best way to escape a problem is to solve it.
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| | Xenos
Webmaster
| "Re(2):Re(10):Installation problem CT8775C" , posted Sun 27 Jun 17:49
Open up the furnace, look on the control strip. there is a Y terminal in there. is the Blue conected to it?
Xenos.
The best way to escape a problem is to solve it.
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| | Coburn
| "Re(3):Re(10):Installation problem CT8775C" , posted Sun 27 Jun 17:55
Yes, the Blue wire is connected to the Y terminal. Also, the small Red wire running up to the transformer is connected to this same terminal.
I removed a White-Rodgers Thermostat control and am attempting to install a Honeywell CT8775C control. I get the fan to kick on but no cooling. My central system consists of a Trane unit which is not a heat pump unit. The furnace is natural gas fired. The wires coming out of the wall are B W R and G no yellow. The White-Rodgers control had a built-in yellow wire. Can you please assist.
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| | Xenos
Webmaster
| "Re(4):Re(10):Installation problem CT8775C" , posted Sun 27 Jun 18:07
Ok I'm confused, the transformer has 2 wires. R and C ( power and Common). Neither of these can be Y.
Xenos.
The best way to escape a problem is to solve it.
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| | Coburn
| "Re(5):Re(10):Installation problem CT8775C" , posted Sun 27 Jun 18:55
The outside unit is now running after I connected the Blue wire to the Y terminal in the Honeywell thermostat control unit. It would sure seem that the industry would standardize this wiring skeen. Perhaps, since my house is 40 years old the wiring may have been screwed with by various contractors working on air conditioning and heating systems over the years.
It was sure getting hot in here. Many thanks for your tireless effort attempting to understand and resolve my problem with this installation.
I removed a White-Rodgers Thermostat control and am attempting to install a Honeywell CT8775C control. I get the fan to kick on but no cooling. My central system consists of a Trane unit which is not a heat pump unit. The furnace is natural gas fired. The wires coming out of the wall are B W R and G no yellow. The White-Rodgers control had a built-in yellow wire. Can you please assist.
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| | Coburn
| "Re(5):Re(10):Installation problem CT8775C" , posted Sun 27 Jun 18:28
The wires coming into the furnace cabinet control system from the outside unit are only Red and White. The Red wire is attached to the terminal marked Y and the White wire is attached to the terminal marked C. There is a Blue wire running from this Y terminal to the thermostat control unit. Also, this Lennox unit has a 2 Amp built-in breaker switch. I can see a transformer inside this furnace cabinet having a yellow wire but no directly connected to the outgoing terminal to the thermostat.
I removed a White-Rodgers Thermostat control and am attempting to install a Honeywell CT8775C control. I get the fan to kick on but no cooling. My central system consists of a Trane unit which is not a heat pump unit. The furnace is natural gas fired. The wires coming out of the wall are B W R and G no yellow. The White-Rodgers control had a built-in yellow wire. Can you please assist.
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| | Xenos
Webmaster
| "Re(6):Re(10):Installation problem CT8775C" , posted Sun 27 Jun 18:40
“The Red wire is attached to the terminal marked Y and the White wire is attached to the terminal marked C”
If this is out door wires, which one of these connects to the thermostat wires? Which ever it is connect it to Y on the thermostat.
Xenos.
The best way to escape a problem is to solve it.
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| | Xenos
Webmaster
| "Re(10):Installation problem CT8775C" , posted Sun 27 Jun 17:45
For a test you could jump the R to the blue using a 1.5 to 2 amp fuse. if the fuse blows you know it's not Y and if the A/C starts you know it is.
Xenos.
The best way to escape a problem is to solve it.
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