A/C Compressor not cycling???

monte87 · Jun 16, 2008

Greetings guys-

It seems after boosting my A/C with some good ole original R12, My compressor does not seem to cycle on and off anymore like it use. I do know-When it cycles constant the system is low, which caused my warm air syndrome (Lack of freon). Grant it-Now i have ice cold A/C but from what i see, The comporessor doesnt cycle at all anymore. What can cause this????
i also understand the concept of the low pressure swicth, preventing the compressor from burning out when there isnt enough freon in the system Would a bad LPS cause the system/compressor not to cycle at all?

Thanks you in advnace for your replies in advance!
Anthony

~SEMPER FI~

monte87 · Jun 16, 2008

rephrase- The compressor seems to be running constant....

Ike83 · Jun 16, 2008

I thought R12 was illegal?

monte87 · Jun 16, 2008

Ike83 said:
I thought R12 was illegal?

It is illegal to manufacture it in the U.S.. You have to be EPA 609 certified to purchase it.

Ike83 · Jun 16, 2008

Ahhhh! I see.

monte87 · Jun 16, 2008

There is lots of R12 out there, they just dont make it anymore. And to buy whatever is out there-You need top be MVAC EPA 609 cert. I think mexico still makes R12, only until this year-or something like that, im not 100% sure though,

Later Ant

HISSIN50 · Jun 16, 2008

If you charged it too much, the low side doesnt pull down far enough to kick the LPCS off. Then the compressor runs non-stop.

Watch for evap freezing or risking the blowing of a seal.

monte87 · Jun 16, 2008

HISSIN50 said:
If you charged it too much, the low side doesnt pull down far enough to kick the LPCS off. Then the compressor runs non-stop.

Watch for evap freezing or risking the blowing of a seal.

How do i go about correcting this? The low pressure side read 38psi on the gauge-that is when i pulled the freon off. Thought it was pretty much done.

Hit me back, Thnaks Anthony

HISSIN50 · Jun 16, 2008

monte87 said:
How do i go about correcting this? The low pressure side read 38psi on the gauge-that is when i pulled the freon off. Thought it was pretty much done.

Hit me back, Thnaks Anthony

What was the ambient temp when you checked pressure? Can you see high-side pressure (you need a set of manifold gauges)? Both are very important things to consider when noting charges pressures.

38 PSIG should give a high side pressure of over 300 PSIG in nearly 120*F ambient temps.

If it's 100*F outside, generally you would have wanted to be closer to 25 PSIG. When it comes to being overcharged, I worry about high-side pressure more than low-side pressure.

monte87 · Jun 16, 2008

At the time of charging in the early a.m. in NYC was about 80 with hugeeeeeee humidity, But the daytime high was 88 again with hugeeeeeeeeeeeeeee humidity, making it feel like it was 95.
I was following info stating when adding 2 cans of gas the high side will read about 250-300 psi and the low side about 28-38psi which would be considered normal.
On another side note-I have a HVAC mechaincal temp gauge/probe in the vent and it read 45 on its lowest and about 50 coming out the vent.

Whatta ya think, Hit me back please,
Many Thanks Anthony

HISSIN50 said:
What was the ambient temp when you checked pressure? Can you see high-side pressure (you need a set of manifold gauges)? Both are very important things to consider when noting charges pressures.

38 PSIG should give a high side pressure of over 300 PSIG in nearly 120*F ambient temps.

If it's 100*F outside, generally you would have wanted to be closer to 25 PSIG. When it comes to being overcharged, I worry about high-side pressure more than low-side pressure.

allballsmustang · Jun 16, 2008

id say your overcharged a little too... if you use a PT chart(Pressure Temperature chart) for charging R-12, it will tell you that at 80*f your pressure should read about 26.7psi properly charged and about 37 at 100*f... do your saying your at 38psi at only 80 which is a bit high...you can also go by your air coming off of the evaporator coil...45 is pretty good but if you pull out a little refrigerant it may go up a little... if your looking for a pt chart just google R-12 PT Chart... hope that may help you...

Jim

monte87 · Jun 17, 2008

Thank you all so much GENTLEMAN! Prop's to Hissin and allballsmustang!, take a bow....

Thanks Anthony

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