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  #16  
Old 07-10-2011, 09:42 PM
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Everyone should read that for its entertainment value ... even if they would not consider touching a Txvalve...

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  #17  
Old 07-11-2011, 10:26 AM
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This sentence from the link provided is what I thought would be the case.

"Too much, it floods back and damages the compressor. Too little, you starve the evaporator, losing cooling capacity."

So, if this statement is true,,,

If the return line to the pump is quite cold, then there is too much flow of refrigerant, and the expansion valve needs to be tightened to restrict the flow.

If the return line is hot, there is too little refrigerant flow, and the expansion valve needs to be opened.

And,,,

Too much flow and all of the refrigerant will not turn into gas in the evaporator.
And liquid will return to the pump, and may cause damage.

Too little flow, results in too little fluid expansion in the evaporateor, causing the system
to not cool well.

Does this seem to be a correct assumption from the information in the article ?
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  #18  
Old 07-11-2011, 11:41 AM
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Yes, from all I have read that is true...
with the caveat that ' hot' coming out of the evaporator means well above the ambient air temperature being blown across the evaporator fins...

And

that there is a range of 'fully extracting' the cooling potential of the refrigerant being sprayed into the evaporator which will be reflected in changes in the vent temperature but which would not cause the need for physical changes to the position of the Txvalve for the reason stated about its Constant ' seeking ' type of behavior .... thus a mistake in judging and applying ' correction ' to the Txvalve in the wrong direction ( easily the result of reading the results at the wrong time in the constantly changing cycle ) would be catastrophic in its effect upon the compressor... slugging it with liquid refrigerant.
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  #19  
Old 07-11-2011, 07:36 PM
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If you are going to adjust it you need to measure the temp right after the valve, then at the end of the evaporator. Measure the pressure, then look at your pressure temp chart, differance is superheat. Need some superheat, about 15-20 or so to be sure to evaporate all refridgerant. Vstech may want to chime in on this, but this is my basic understanding. Had to set one on a thermo king unit once.

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