Originally Posted by kuehl
Wwest,
We promote the use of our binary low high pressure switch for these reasons:
1) Certain regulations required a switch.
Regulations often, most often, have reasons behind them that benefit society. What is you opinion for the reasons for this one..?
2) If system refrigerant levels run too low the compressor can be damaged
do to lack of sufficient refrigerant/oil flow.
3) Excessive high side pressures can blow out the compressor nose seal.
Amongst a few other component's parts, components themselves.
Unless you can prove to your peers that your theory of over pressurizing of the system is caused by engine heat, meaning you can provide real data of system pressures
My "peers" need no proving (inteligence prevails), it's the naysayer's "peers", the "ungodly" that doubt, without reason, logical reason.
Anyone really TRULY doubt that in the situation described rising convection and radient engine heat will result in pressure rises in the rear lid condensor thus the entire high side...???
Hold up your hand...
What..? No naysayer IDIOTS..?
So the question then becomes "how high" might the high side pressure rise...??
A) System turned off, prior to starting engine and running AC
What if I simply say, from memory (often faulty), and stand behind, without actual measurement, 40 PSI...both.
Will that suffice..?
B) System running normally
85F OAT, R-12, high side 150-250 PSI..
C) System turned off, after running engine and AC
Instantaneously, indeterminant, high side rises above "B" above.
Everything you continually post on all the threads is simply your own personal
theory.
Yes, personal theory based on SOLID, factual information, some provided by yours truly.
The 911/930 system equalizes rather quickly...
What is "quickly" for you..? For me it was long enough to decide that my theory had good foundation
...when the engine is turned off; the high side drops
Have you actually measured, you know for certain/sure it doesn't first, initially rise?
and the low side rises.
How soon, how many minutes, assuming the TXV is in its mostly closed state, the evaporator core is thoroughly CHILLED.
The high side bleeds over to the low side through the TEV
(no matter how cold the evaporator was before hand)
Self-serving, self-justification statment. Of course the depletion of the liquid state refrigerant will be dependent on the evaporator core temperature and thereby the opening level of the TXV. That why the TXV is used, to "meter" the flow of refrigerant.
, its just a simple fact based on the construction of the TEV.
Which, what "fact", yours or mine. Both, actually, on a "clear" day I have little doubt that you have little faith in your above "fact".
And this is true for various other types of systems (industrial, commercial, residential), all depending upon the TEV design.
[/B]How does my "fact" as to the design purpose and use of the TXV differ from yours..?
My "fact" is that the TXV is used to modulate, moderate, the flow of liquid refrigerant into the evaporator core to prevent freeze up. Furthermore it is not a Bang-Bang type servomechanisom, virtually instantly transitioning from fully open to fully closed. More like a linear function, closing slowly the closer the sensed temperature gets to the level at which evaporator freeze up would result.
So tell us, how many 911 or 930' air conditioning systems have you worked on in the past 30 years?
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