Install a Trane heatpump as A/C compressor only

Old 07-01-06, 07:19 AM
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Install a Trane heatpump as A/C compressor only

I want to install a Trane X11 model 2TWR2-IN-1B heat pump as an A/C compressor only. I was given the unit for free and was told that it would be wired for only A/C. Problem is that I do not know (neither did the A/C guy that installed it).
I have a four colored wire from my thermostat to the air handler and a four wire from the air handler to the compressor. My air handler is a gas furnace unit, so it is not set up as a heat pump.

The connections on the thermostat;
G - Green wire (air handler blower)
Y - Blue wire (compressor)
W - White wire (??)
R - Red wire (power?)

The connection on the air handler from the thermostat wire is;
G - Green
Y - Blue
W - White
R - Red

The wire going from the air handler to the compressor (same four color wire)
Y(on air hander) - red wire
C(on air handler) - white wire
All other colors not used (blue and green)

Yellow is the positive side of the solenoid and blue is the negative side fo the solenoid.
I was told to connect the yellow and red wires on the compressor to the Y on the air hander, and the blue to the C on the air hander.

Problem is when connected like that, it works as the heat pump (not A/C). Should I connected the yellow and orange to the Y on the air handler, and the blue to the C on the air handler.

Thanks in advance,
Old 07-01-06, 12:08 PM
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You will probably need to energize the reversing valve along with the contactor on a call for cooling. Just run a wire from each side of the control conections of the contactor to the reversing valve wires and give that a try.
Old 07-01-06, 12:12 PM
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Have to think about this
The only diff in a AC to heat pump is the 4 way valve, well a little diff. Now you dont say how old unit is???? some old units was in AC mode and for heat the 4 way had to work. Then they all went to the unit is in heat mode all the time.Then the 4 way valve has to work to put it into AC or defrost mode.
You need O/B and O is the cool valve.

Id ring out your Colors. are make sure you know them and where they go.

R is power W is heat Y is compressor G is blower This is thr set up on most.

I think!!!!!tie the valve to work with Y


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