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I have a TRANE Furnace model TWE048C140F4 and need to know

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the right wiring because my...
I have a TRANE Furnace model TWE048C140F4 and need to know the right wiring because my 4 Ton compressor is on all the time. I looks that the thermostat is not controlling it. and without connecting the thermostat the compressor is on. I believe that I need help in the wiring of the furnace. Please Help, the electrical billing is killing me.
Submitted: 6 years ago.Category: HVAC
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11/14/2011
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 6 years ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22,888
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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Hello,

 

If you turn the power off to the furnace, does outdoor unit continue to run?

 

 

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Customer reply replied 6 years ago
No. It stop running when I turn off the Furnace Breaker.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 6 years ago

 

Has this always been an issue or just after a particular project?

 

 

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Customer reply replied 6 years ago
There was a guy that came in to replace the thermostat and installed a Simple Confort Pro 5811 Programable Thermostat. It began since that but I did not pay attention. That was 6 month ago.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 6 years ago

Thank you,

 

and is this ac or heat pump?

 

 

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Customer reply replied 6 years ago
This is AC and Heat Pump and another detail is that the guy rewired the furnace wiring too. I noticed that if I got disconnected the thermostat completely and it still running the compressor when I turn on the furnace breaker. I believe that the problem is in the furnace wiring.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 6 years ago

You are correct.

 

I guess to move forward I would need furnace info and then I can look at proper schematics

 

 

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Customer reply replied 6 years ago
I gave you the info of the furnace already.
TRANE
Model: TWE048C140F4
230VAC
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 6 years ago
I apologize..play on words...The TWE is the air handler...I need number of the heating cooling unit outside.
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Customer reply replied 6 years ago
ok

Trane XE1000

TRW048C100A3
With Heat Pump
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 6 years ago

 

Thank you,

 

And to verify is the condenser fan AND compressor running non stop?

 

 

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Customer reply replied 6 years ago
Yes
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 6 years ago

Thank you.

 

What color wires do you have on what terminals in heat pump? I refer to the thermostat wires on R,Y,O,T.......

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Customer reply replied 6 years ago
Are you asking in the furnace?
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 6 years ago
actually I will need connections in heat pump (outdoor unit) and air handler/blower (indoor unit)....
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Customer reply replied 6 years ago
In the furnace. Indoor unit, B= Blue wire W1=White G=Green R=White wire that goes to a 3 wires cable and the red wire is connected with a wire connector to the outside unit and thermostat. Outside is dark already and those wires where not changed.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 6 years ago

The 3 wire cable that is attached to R via the white...we should have only 2 wires hot from R...one to thermostat and one to R in outdoor unit.

 

Is the 3 wire cable only using 2 of the conductors?

 

 

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Customer reply replied 6 years ago
Yes
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 6 years ago
2 wires on O and one on Y?
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Customer reply replied 6 years ago
In the furnace there are no wires on O and wires on Y
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 6 years ago

If no wires on O then they have not landed them on air handler strip...and must have twisted O from thermostat to O to heat pump. O = reverse valve and is necessary for heat function.

 

2 wires on Y..one to outdoors and one to thermostat?

 

 

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Customer reply replied 6 years ago
the two yellow wires are together in ia wire nut in the furnace indoor unit.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 6 years ago

 

The Y wire that goes outside is the only wire that starts the compressor...the R is 24v constant, Y = compressor, O = reverse valve.

 

Somewhere you have a short of 24v crossing from R to Y. This will take elimination...but the yellow wire coming from outdoor must be traced to see where the 24v is being connected to it.

 

My bet would normally be thermostat wiring but you said it continues to run with thermostat off the wall.

 

This means the yellow wire is picking up 24 from the R teminal wires somewhere.

 

I wish I could help more....but the best I can do is recommend tracing yellow wire and making sure it only goes to Y on thermostat and Y wire direct to Y in heat pump

 

 

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Customer reply replied 6 years ago
I disconnected the yellow wires from the wire nut at the furnace and the compressor is still on
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 6 years ago

Then your breech is at the r wire going outside and the yellow wire going outside.

 

But also, you said when thermostat disconnected the compressor didnt run...and the fact you removed Y and it still runs doesnot support the thermostat being off with no opertion.

 

With Y unhooked and unit still running can only be 1 of 2 things...

 

Short from r to outdoor unit to Y in outdoor unit...and then a mechanically stuck contactor.

 

But you said the unit shut off when power turned off to air handler.

 

With that info and the removing Y...your issue is from the indoor unit to the outdoor unit and involves power getting from the R wire to the Y terminal.

 

 

BillyHvac
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