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Posted by Dave Martindale on May 22, 2007, 1:13 pm
.p.jm@see_my_sig_for_address.com writes:
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>>A pressure of 0 PSI gage (15 PSI absolute) in an R-22 or R-410a system
>>means that the evaporator is either at -40 degrees, or it's dry (no
>>refrigerant flowing). This is not a normal operating condition for an
>>air conditioning system.
> Say WHAT ????? Bullshit.
> A ) the temperature equivalent at saturation at that pressure
>will vary with the refrigerant
Yes, but it's almost the same for R-22 and R410a, the only two
refrigerants being discussed in this thread (see the title).
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> B ) That applies only at saturation, - in the pure gaseous
>state the pressure tells you nothing about the temperature. You can
>very easily, and very often do, have a system malfunction where the
>suction line is at zero PSI, the system is running, and the line temp
>or evap temp is 70 degrees F. This is an every day commonplace thing.
> Wanna see ? Go up to any properly running system and remove
>1/2 the charge. Watch.
I did say "in normal operation". Operating with half the charge missing
is not normal operation.
Sure you can come up with situations where the suction line is below
atmospheric, and air and/or water can get in. But *most* leaks are
outwards and can't admit water, which is what the other poster was
saying.
Dave
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Posted by <kjpro on May 20, 2007, 6:59 pm
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> >> Yes it is, unless, as I stated in my post, a leak occurs to the point
> >where
> >> a vacuum is caused during operation, in which case the charge is
> >> fractionated and should be completely removed, the leak repaired, a
vacuum
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> >> pulled, a filter/dryer installed and/or replaced, and a new charge
weighed
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> >> in.
> >> Remember, I was responding to Tony's post where he stated that with
410A,
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> >> even a small leak will cause water to enter the system.
> >> This is simply not true.
> >But it *IS* true, it can and will happen.
> A leak can let water (and air, which is also bad) enter the system if
> the pressure inside the line is below atmospheric pressure. But how
> often does that happen?
> A pressure of 0 PSI gage (15 PSI absolute) in an R-22 or R-410a system
> means that the evaporator is either at -40 degrees, or it's dry (no
> refrigerant flowing). This is not a normal operating condition for an
> air conditioning system.
> In normal operation, the low side pressure is several times atmospheric
> pressure and any leakage is outwards.
> Dave
You better get some current training under your belt, before you start
spewing shit about things you don't understand.
Moisture doesn't care if your system is operating under a vacuum or not.
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Posted by Bob_Loblaw on May 21, 2007, 10:33 am
davem@cs.ubc.ca (Dave Martindale) wrote \
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> A leak can let water (and air, which is also bad) enter the system if
> the pressure inside the line is below atmospheric pressure. But how
> often does that happen?
>
> A pressure of 0 PSI gage (15 PSI absolute) in an R-22 or R-410a system
> means that the evaporator is either at -40 degrees, or it's dry (no
> refrigerant flowing). This is not a normal operating condition for an
> air conditioning system.
>
> In normal operation, the low side pressure is several times
> atmospheric pressure and any leakage is outwards.
>
> Dave
Thank You!!
--
"Poor Canada. So desperate to be the socialist nirvana of multicultural
heaven, that it ends up being used and abused by the dregs of the world.
Oh, the joys of diversity!"
Respectfully, Bob
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Posted by Bob_Loblaw on May 21, 2007, 10:32 am
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> But it *IS* true, it can and will happen.
Ya, I know, that's what you keep saying.
But you can't back it up.
Like the second coming of Christ, I'm still waiting...
--
"Poor Canada. So desperate to be the socialist nirvana of multicultural
heaven, that it ends up being used and abused by the dregs of the world.
Oh, the joys of diversity!"
Respectfully, Bob
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Posted by <kjpro on May 18, 2007, 12:45 am
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> First Thank you Mr. Kinch
> You are the first person that I read in these forum
> about Refrigerant 410,
> I personally I do not find anything good about R-410.
> but then all new refrigerants are not that great
> with exception of R-508B all rest run with high temp. discharge
> if system develop leak on low side 9 to 1 you must change oil
> because you can not take moisture out of oil,
Yes you can, it's just a pain in the ass!
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Page 7 of 15 < 1 2 3 > last >>
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>>means that the evaporator is either at -40 degrees, or it's dry (no
>>refrigerant flowing). This is not a normal operating condition for an
>>air conditioning system.
> Say WHAT ????? Bullshit.
> A ) the temperature equivalent at saturation at that pressure
>will vary with the refrigerant