For a central residential AC system, for the two copper pipes going to
the outside condenser unit (outflow/inflow), which copper pipe(s)
should the insulation be placed around?
And what purpose does the insulation play in the AC system's operation?
The insulation should be placed around the larger copper tube. Its
purpose is to prevent condensation from forming around that tube since
it will be cooler than the surrounding air. If you fail to do so, the
water dripping from it (condensation) might damage wood or plaster in
the vicinity of the tube.
The form of this sentence is incorrect. In addition, it contains several
Actually, there's usually between 7 and 10 copper pipes between the the air
handler and the outdoor unit. Most of them are used for communications
between these pieces of equipment. Some of them must be insulated, and the
remainder can be insulated.
Didn't you learn in English that you don't start a sentence with "and"?
Stick to playing with stucco and paint. It's not as likely to cause
permanent damage to you.
Usually the smaller line gets insulated with R-38 inside. This keeps
the heat in the pipe so it can be carried outside and not cause any
undue strain on your cooling system inside. Make sure you do NOT
insulate the small line outside.....inside only.
On the outside you need to insulate the big line.
Make sure you give the outside unit a good acid washing and a light
sanding with a #150 grit belt sander to increase heat transfer from
the condenser coil.
The big pipe is marked outflow: from the house to the unit.
The little pipe is marked inflow: from the unit to the house.
And so the heated gas is sent to the outside unit using the big pipe
(3/4" diameter copper). The outside unit removes the heat. And then
what is sent into the house should be a liquid, which is why the pipe
Is that correct?
the liquid is sent through the smaller pipe because ........can you
imaging all the noise that much liquid would make sending it through a
larger pipe? Thats why the small line is insulated. To keep down all
the rushing liquid noise. Sometimes, if it gets to noisy you can put a
flow control valve in the line and throttle it down to dampen the
liquid rush noise.
With furnaces, we use the term "supply" and "return". So, the one pipe
supplies the evaporator (outflow, our out from the unit) and the other one
returns the refrigerant to the compressor. So, I think they are labelled
Christopher A. Young
"Ojas" < email@example.com> wrote in message
You have lot different answers some are correct but the way are
put you really can tell if are jokers or serious answers,
first your lager pipe/tubing is suction to compressor
which is ideal to be insulated because you don't want
water drips from sweating on the line and on the long runs it
also saves some energy which makes unit little more efficient
but not much that you will be able to see or measure.
The smaller line is your liquid line which carries liquid to
your cooling coil inside your house (remember cooling takes
place when liquid expand from liquid form in to gas)in any
case this line does not need to be insulated unless again
line is long and exposed to sun or is going through area
where temperature is higher then outside the location of
condenser, so in 99% of installations you will not see this
small line insulated but yes if you whish it will not hurt
the system if it is insulated but you may benefit some
as I said it all depend on your setup and location.
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