From what I remember, three tons will run on 3/8 - 3/4 if the line set
is fairly short. But, I'd have to go back and look in the book.
However, a 3/8 liquid and 7/8 vapor line should handle the needs of a
three ton system. Up to some length of line, that is.
If you're running off a 1/4 liquid line, it's likely to be starving
the evaporator. High superheat, and possibly high head.
Christopher A. Young
You can\'t shout down a troll.
I don't know why there is any doubt among the group that anything less than
a 3/8 liquid line is most certainly the problem... or at least the primary
I have yet to see a new system in the past 15 years require anything less
than 3/8 LL... larger for extremely long line runs. As for suction line, if
it's less than 30 feet you should be able to get by with a 3/4 on 13 SEER,
anything else and you will likely need a 7/8 suction line.
Anything over 3 ton on 13 SEER I've seen 7/8 as the minimum required, larger
on extremely long runs.
If it were my system, I would have a new company come out and replace the
liquid line with 3/8, double check the specs to see if 7/8 suction were
needed and if so, also have that replaced... then I would send the bill for
repair to the installing company with demand for payment... perhaps from an
Not much doubt left... problem solved... thanks for playing.
On Wed, 23 Aug 2006 20:33:05 GMT, "Stormin Mormon"
That's just a stupid question for someone who states that they are or
have been in the field for a number of years.
It can take ten minutes or ten hours, what does it matter how long?
You run the vacuum pump until you bring the system down to the
"REQUIRED" micron level. Then there are other considerations such as
triple purge/evacuate which have more to do with noncondensibles or
moisture in the system. Do some reading once in a while, geeze.
On Fri, 25 Aug 2006 15:55:17 GMT, "Stormin Mormon"
Anyone care to tell me what he wrote about? It makes no sense, not
that I expect it from an illiterate, ignorant, fool. Stormy, you
should go out to WalMart, browse the toy section, and buy a clue,
because I think that Col. Mustard did you with a candle stick in the
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