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Where is the expansion valve?

Posted by busboy (My Page) on
Sun, Aug 26, 12 at 13:56

I understand that the expansion valve is where the warm refrigerant from the outdoor unit basically vaporizes, changes state from liquid to gas, and as a result cools tremendously. Is this a seperate device in the air handler unit or is it built into the evaporator coil (unit)? Inquiring mind want to know.

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RE: Where is the expansion valve?

It is usually right at the evaporator coil, and if it is a TXV (Thermostatic Expansion Valve) may even have a separate sensor bulb attached to the evaporator outlet to control the metering of liquid into the evaporator.

Older systems just used a fixed orifice right at the input to the evaporator coil.

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