just recently had a new system (compressor and air handler) installed in
my home and now there is a swishing sound coming from the liquid line (small
one). The sound did not occur with my old unit (which was a bit smaller)
and I wouldnt worry about it except for the fact that the lines run above my
daughters ceiling and she is having a hard time sleeping when the a/c comes
on at night. What might be a possible cause and solution for this problem.
The installer said it has to do with refrigerant flashing in the line and
doesnt seem to think there is much that can be done. But as it didnt happen
with my old unit I would think that there is something that can be done.
Thank you for your time!

"toadstl" wrote in message
...
just recently had a new system (compressor and air handler) installed in
my home and now there is a swishing sound coming from the liquid line
(small
one). The sound did not occur with my old unit (which was a bit smaller)
and I wouldnt worry about it except for the fact that the lines run above
my
daughters ceiling and she is having a hard time sleeping when the a/c
comes
on at night. What might be a possible cause and solution for this
problem.
The installer said it has to do with refrigerant flashing in the line and
doesnt seem to think there is much that can be done. But as it didnt
happen
with my old unit I would think that there is something that can be done.
Thank you for your time!


Could be low on refrigerant or something as simple as the line resting on
the rafters causing the sound to carry through the wood beam. in either
case, I would ask the installer to come back out and remedy the
situation....

toadstl wrote:

just recently had a new system (compressor and air handler) installed in
my home and now there is a swishing sound coming from the liquid line (small
one). The sound did not occur with my old unit (which was a bit smaller)
and I wouldnt worry about it except for the fact that the lines run above my
daughters ceiling and she is having a hard time sleeping when the a/c comes
on at night. What might be a possible cause and solution for this problem.
The installer said it has to do with refrigerant flashing in the line and
doesnt seem to think there is much that can be done. But as it didnt happen
with my old unit I would think that there is something that can be done.
Thank you for your time!


Refrigerant should NEVER be flashing to gas in the liquid line! That
will greatly reduce the capacity of the system.
Yes, it could be low on refrigerant, or there could be a restriction
'somewhere in the Liquid Line Circuit' causing flashing. I doubt that it
is hot enough, where the liquid line is in your home, to cause flashing.

That problem definitely needs to be corrected, ASAP. Darrell - udarrell

--
Crank Your Air-Conditioner Up To Specs
http://www.udarrell.com/air-conditio...city-seer.html

Darrell said it right. If your old system was smaller, the liquid line
may be too small for the new larger system. The installer should have
figured that out before he installed the new system. By the way, why
did he install a larger unit? Did he do a load calculation? He may
have oversized the system. There may be a refrigerant leak in the new
system. At any rate, the contractor should come back and take care of
the problem.

Stretch

On Sun, 04 Sep 2005 09:15:14 GMT, "toadstl"
wrote:

just recently had a new system (compressor and air handler) installed in
my home and now there is a swishing sound coming from the liquid line (small
one). The sound did not occur with my old unit (which was a bit smaller)
and I wouldnt worry about it except for the fact that the lines run above my
daughters ceiling and she is having a hard time sleeping when the a/c comes
on at night. What might be a possible cause and solution for this problem.
The installer said it has to do with refrigerant flashing in the line and
doesnt seem to think there is much that can be done. But as it didnt happen
with my old unit I would think that there is something that can be done.
Thank you for your time!


If your AC works perfectly other than the noise, then you need to try
insulating the line noise from your daughters room.
1. Lift it off the joists - if necessary, hang it from the rafters,
but definitely don't let touch any of the framework around her room..
2. Insulate the line over her room with extra insulation.
3. Insulate the ceiling over her room.

I thank everyone for the responses! I did a little more investigation and
it would seem that the noise is more prominent the closer you get to the
expansion valve. You cannot even hear the noise outside at the compressor.
The air handler is brand new so I wouldnt think that the expansion valve
would be worn out (if they even wear out at all) but is it possible that it
is a faulty expansion valve and is somehow causing the hissing/swishing
sound? He did do calculations and figured that my old unit was too small.
And he also charged the unit using some superheat calculations, pressure and
temperature guages in the house and on the return line. I was standing next
to him the whole time as he explained the process. So I would think that
the unit is charged correctly but maybe I could ask him to come back and
check it just to make sure because you never know! Thanks again for the
input! It is greatly appreciated!


"Stretch" wrote in message
oups.com...
Darrell said it right. If your old system was smaller, the liquid line
may be too small for the new larger system. The installer should have
figured that out before he installed the new system. By the way, why
did he install a larger unit? Did he do a load calculation? He may
have oversized the system. There may be a refrigerant leak in the new
system. At any rate, the contractor should come back and take care of
the problem.

Stretch

"Sherman" wrote in message
...
On Sun, 04 Sep 2005 09:15:14 GMT, "toadstl"
wrote:

just recently had a new system (compressor and air handler) installed in
my home and now there is a swishing sound coming from the liquid line
(small
one). The sound did not occur with my old unit (which was a bit smaller)
and I wouldnt worry about it except for the fact that the lines run above
my
daughters ceiling and she is having a hard time sleeping when the a/c
comes
on at night. What might be a possible cause and solution for this
problem.
The installer said it has to do with refrigerant flashing in the line and
doesnt seem to think there is much that can be done. But as it didnt
happen
with my old unit I would think that there is something that can be done.
Thank you for your time!


If your AC works perfectly other than the noise, then you need to try
insulating the line noise from your daughters room.
1. Lift it off the joists - if necessary, hang it from the rafters,
but definitely don't let touch any of the framework around her room..
2. Insulate the line over her room with extra insulation.
3. Insulate the ceiling over her room.



Thanks for the input! I wish it were that simple though . The problem is
that the line runs through a vaulted ceiling so that would require me to rip
off the sheetrock. As a last resort I thought that I may have to have the
installer reroute the lines around her room to fix the problem but am hoping
that it wont come to that because it will add 15 to 20 feet to the length of
the lines and i will have to run them down the outside of my house instead
of through the outer wall which doesnt look as good. It must have something
to do with this new unit because before I got this new unit I never heard
this sound in the 8 years that I have lived in the house.

These geezers dont Know NUFFIN about NUFFIN ALCO makes a simply spiffing
BI-FLOW valve that makes a simply lovely noise as it FLASHES into the liquid
line

HAVE A NICE DAY SAILOR
"toadstl" wrote in message
...
just recently had a new system (compressor and air handler) installed in
my home and now there is a swishing sound coming from the liquid line
(small
one). The sound did not occur with my old unit (which was a bit smaller)
and I wouldnt worry about it except for the fact that the lines run above
my
daughters ceiling and she is having a hard time sleeping when the a/c
comes
on at night. What might be a possible cause and solution for this
problem.
The installer said it has to do with refrigerant flashing in the line and
doesnt seem to think there is much that can be done. But as it didnt
happen
with my old unit I would think that there is something that can be done.
Thank you for your time!

HELLO SAILOR Heat pump BI-Flow valves NEED the liquid line to be insulated
with that round RUUBBERRY stuff that mice think is the local BEDS R US

HAVE A NICE DAY AND DONT GO OUT IN THE RAIN
"toadstl" wrote in message
...
just recently had a new system (compressor and air handler) installed in
my home and now there is a swishing sound coming from the liquid line
(small
one). The sound did not occur with my old unit (which was a bit smaller)
and I wouldnt worry about it except for the fact that the lines run above
my
daughters ceiling and she is having a hard time sleeping when the a/c
comes
on at night. What might be a possible cause and solution for this
problem.
The installer said it has to do with refrigerant flashing in the line and
doesnt seem to think there is much that can be done. But as it didnt
happen
with my old unit I would think that there is something that can be done.
Thank you for your time!

"toadstl" wrote in message
...
I thank everyone for the responses! I did a little more investigation and it
would seem that the noise is more prominent the closer you get to the expansion
valve. You cannot even hear the noise outside at the compressor. The air
handler is brand new so I wouldnt think that the expansion valve would be worn
out (if they even wear out at all) but is it possible that it is a faulty
expansion valve and is somehow causing the hissing/swishing sound? He did do
calculations and figured that my old unit was too small. And he also charged
the unit using some superheat calculations, pressure and temperature guages in
the house and on the return line. I was standing next to him the whole time as
he explained the process. So I would think that the unit is charged correctly
but maybe I could ask him to come back and check it just to make sure because
you never know! Thanks again for the input! It is greatly appreciated!


This is Turtle.

The only thing I could say do and maybe do some good is to take a roll of Gum
wrap and insulate the TXV / expanion valve real good and cut the noise level
down a good bit. Take the whole roll to wrap it with and do use real Gum Wrap to
wrap it with and not the spong rubber stuff. You can cut maybe 1/2 the noise out
with this method.

TURTLE

I never heard an Alco expansion valve make that much noise.

BIFLOW valves should be used only on packaged heat pumps.

A combination check/expansion valve would be used on a split system
heat pump.

Undersized liquid line could have velocity noise.

Undercharged system could have noise in the liquid line.

I would not consider a valve that makes lots of noise during normal
operation, "spiffy". And unwanted noise is not lovely.

Stretch

"TURTLE" wrote in message
...

"toadstl" wrote in message
...
I thank everyone for the responses! I did a little more investigation and
it would seem that the noise is more prominent the closer you get to the
expansion valve. You cannot even hear the noise outside at the
compressor. The air handler is brand new so I wouldnt think that the
expansion valve would be worn out (if they even wear out at all) but is it
possible that it is a faulty expansion valve and is somehow causing the
hissing/swishing sound? He did do calculations and figured that my old
unit was too small. And he also charged the unit using some superheat
calculations, pressure and temperature guages in the house and on the
return line. I was standing next to him the whole time as he explained
the process. So I would think that the unit is charged correctly but
maybe I could ask him to come back and check it just to make sure because
you never know! Thanks again for the input! It is greatly appreciated!


This is Turtle.

The only thing I could say do and maybe do some good is to take a roll of
Gum wrap and insulate the TXV / expanion valve real good and cut the noise
level down a good bit. Take the whole roll to wrap it with and do use real
Gum Wrap to wrap it with and not the spong rubber stuff. You can cut maybe
1/2 the noise out with this method.

TURTLE

Thanks for the advise! I may have to give that a try.

The Uni Aire unit uses a Alco BI Flow valve to inject a 20% quality
liquid/gas mixture into the liquid line and so do a number of other
manufacturers. For this reason the
liquid line has to be insulated. The standard method of course is check
valves with either TXV, or capillary.

The question asked cannot be answered by anyone as
there a number of possible reasons for the noise from
a partially blocked drier to an undersized liquid line.

HAVE A NICE DAY SAILOR
"Stretch" wrote in message
oups.com...
I never heard an Alco expansion valve make that much noise.

BIFLOW valves should be used only on packaged heat pumps.

A combination check/expansion valve would be used on a split system
heat pump.

Undersized liquid line could have velocity noise.

Undercharged system could have noise in the liquid line.

I would not consider a valve that makes lots of noise during normal
operation, "spiffy". And unwanted noise is not lovely.

Stretch