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Heating & Air Conditioning

Where is the expansion valve?

11 years ago

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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Comment (1)

brickeyee
11 years ago
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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