Split system topping-up

Posted by Yvan on August 7, 2009, 1:32 pm

I have 10 years old LG 12 a/c split system, and since last year it does
not cool as it used to. It is used only during summer, not for heating.

I have r22 manifold, so van anyone explain how to top-up with r22? I do
not have vacuum pump, and I can not evacuate the gas and put 780 grams
of r22 (as it is written on the label).

Where I am it is hard to find good a/c tech, and few I asked answered
that they only top-up by pressure, not as I described above.

I have r22 P/T chart, and it is also clearly marked on the manifold
dial. But I guess that it is not the same if I top up at 25 Celsius or
35 Celsius (75F or 95F), or while outdoor unit is exposed to the sun or
in the shade. How do you compensate for this differences?

I measured temp by inserting temp sensor an inch in the indoor unit, and
it shows 7.5 Celsius (44.6F), while my other aircon shows 5.5C (41.0F).

--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** Registered Linux user #291606 **
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Posted by Steve on August 7, 2009, 6:26 pm

>I have 10 years old LG 12 a/c split system, and since last year it does
> not cool as it used to. It is used only during summer, not for heating.
> I have r22 manifold, so van anyone explain how to top-up with r22? I do
> not have vacuum pump, and I can not evacuate the gas and put 780 grams
> of r22 (as it is written on the label).
> Where I am it is hard to find good a/c tech, and few I asked answered
> that they only top-up by pressure, not as I described above.
> I have r22 P/T chart, and it is also clearly marked on the manifold
> dial. But I guess that it is not the same if I top up at 25 Celsius or
> 35 Celsius (75F or 95F), or while outdoor unit is exposed to the sun or
> in the shade. How do you compensate for this differences?
> I measured temp by inserting temp sensor an inch in the indoor unit, and
> it shows 7.5 Celsius (44.6F), while my other aircon shows 5.5C (41.0F).

charge it by superheat and subcooling.

Posted by Stormin Mormon on August 7, 2009, 6:37 pm

If he's in the USA, he'll need an EPA card to operate,
legally. Of course, we don't know if the system has a
restriction, or some other problem is causing the poor
cooling. Who knows, might even be (cover your eyes,
everyone) the condensor needs cleaning. (Safe to open your
eyes again.)

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.

charge it by superheat and subcooling.

Posted by Stormin Mormon on August 7, 2009, 6:39 pm

Steve's right, to check superheat and subcooling. You'd want
to know that, to see if there are other problems with the
sstem, that a quick top off might not reveal.

So, where are you? If you're in the US, I presume your have
your EPA card?

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.

I have 10 years old LG 12 a/c split system, and since last
year it does
not cool as it used to. It is used only during summer, not
for heating.

I have r22 manifold, so van anyone explain how to top-up
with r22? I do
not have vacuum pump, and I can not evacuate the gas and put
780 grams
of r22 (as it is written on the label).

Where I am it is hard to find good a/c tech, and few I asked
answered
that they only top-up by pressure, not as I described above.

I have r22 P/T chart, and it is also clearly marked on the
manifold
dial. But I guess that it is not the same if I top up at 25
Celsius or
35 Celsius (75F or 95F), or while outdoor unit is exposed to
the sun or
in the shade. How do you compensate for this differences?

I measured temp by inserting temp sensor an inch in the
indoor unit, and
it shows 7.5 Celsius (44.6F), while my other aircon shows
5.5C (41.0F).

--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa
#291606 **
/ / \/ /\ \ ** Registered Linux user #291606 **
/__/\____/--\__\ ** http://counter.li.org/ **

Posted by Yvan on August 8, 2009, 3:42 pm

Nedavno Stormin Mormon napisa:

> Steve's right, to check superheat and subcooling. You'd want
> to know that, to see if there are other problems with the
> sstem, that a quick top off might not reveal.
>
> So, where are you? If you're in the US, I presume your have
> your EPA card?

I googled for a while, and it seems that I need some special thermometer
for charge by superheat and subcooling. I am in Serbia, and I think
that it will be hard to find it here.

Any links to a/c charge by superheat and subcooling, that a novice can
understand?

BTW, I only noticed that a/c does not cool as it used to, it seems that
it gradually got like this. Most logical (to me) is that it needs
toping-up. Would some restriction give similar effect?

--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** Registered Linux user #291606 **
/__/\____/--\__\ ** http://counter.li.org/ **

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