expansion valve on a/c unit

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Old 01-25-03, 10:33 AM
jova757
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expansion valve on a/c unit

what does TXV valve do for a/c unit?
does it need one to be on it?
 
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Old 01-25-03, 10:53 AM
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TXV (Thermo-Expason-Valve) is used to control amount of Reg going into the coil. In the past the TXV is found in bigger units.. Now days, it is found in high effecent systems.. So, it don't need to be on every system.. Chances are you may have e Cap-tube system on your A/C and it works just as well.
 
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Old 01-25-03, 05:16 PM
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Question jova757:

Just curious, why do you ask?
 
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Old 01-26-03, 09:57 AM
jova757
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I move alot and see difference thing on unit. Some unit have it some don't! by having it how better do they get?
 
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Old 01-26-03, 01:46 PM
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jova757:

An expansion valve on a residential airconditioner is a deluxe option.

A capilliary tube, which is standard on most units is a fixed feed device.
It meters a set amount of refrigerant, regardless of the cooling load.
An expansion valve on the other hand has a variable flow rate which changes with the load on the evaperator coil.
As the load increases, more refrigerant will be fed to the evaperator coil, and then taper down to match the load.

What this means is that the system can recover faster if the load were to suddenly increase, or shut down the flow and limit refrigerant flooding when the load drops.

Although a TXV is a nice touch, residential a/c loads tend to be somewhat constant.
If it meant a $150.00 difference in installed price, most people wouldn't want it.
 
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