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Old 04-12-2013, 09:34 PM   #1
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How many pound refrigerant to raise from 60- 70psi?


Hello,
How many pound refrigerant (r-22) to raise suction pressure from 60- 70psi?

2.5 ton Goodman unit


Last edited by shovad; 04-13-2013 at 05:56 PM.
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Old 04-13-2013, 12:21 AM   #2
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How many pound refrigerant to raise from 60- 70psi?


That would depend on the total pounds the system needs to operate.

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Old 04-13-2013, 12:56 AM   #3
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How many pound refrigerant to raise from 60- 70psi?


What's your real question? Just come out with it.
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Old 04-13-2013, 03:23 PM   #4
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How many pound refrigerant to raise from 60- 70psi?


If your gauging up on a cool day,60 psi might be a proper charge.

If its a hot day,not so much.

My point is many variables involved.

If you don't know what you are doing,invading your system can introduce air and non condensible gases or worse,moisture,causing your metering device to freeze up.

Stick to charging A/C systems in cars as a DIY project,proper trimming of your home unit is best left to the pros,and I am not trying to sound snarky.

Your wife WILL blame YOU if you work on the A/C and it fails on the hottest day of the year.
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Old 04-13-2013, 05:54 PM   #5
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How many pound refrigerant to raise from 60- 70psi?


Hi,
Yeah I will not be messing with the freon. Just had my unit filled with r22 from HVAC guy and according to my wife the repairman told her that the unit was low on freon at 60psi and ideally it should be 70psi. The outside temp was maybe upper 70s to low 80s. My unit is 2.5 ton Goodman. It seems a little odd that it took him 2 pounds to raise suction pressure from 60 to 70psi.. We stay at 3 story town-home (I don't know if that makes a difference in the amount of r-22) Just want to hear what you all think. My gut tells me we got ripped off,

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Old 04-13-2013, 06:15 PM   #6
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How many pound refrigerant to raise from 60- 70psi?


So did you look to see what the total factory charge is for your unit.
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Old 04-13-2013, 06:18 PM   #7
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How many pound refrigerant to raise from 60- 70psi?


@beenthere I am not sure, I will check to see what it says on the unit when I reach home morrow. Thx
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Old 04-14-2013, 04:53 AM   #8
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How many pound refrigerant to raise from 60- 70psi?


the suction pressure reading out o the condenser varies with the air over the cooling coil at the evap/furnace...40F is typical corresponding F when you read the Freon temp ring on the suction gauge for 22..18F split air in air out reading it as close as possible to that A coil...10F out on the condenser in/out air
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Old 04-14-2013, 07:15 AM   #9
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How many pound refrigerant to raise from 60- 70psi?


Two pounds isnt out of the question,especially if your liquid line extends up to a third floor air handler.

Well played on bringing in a pro,your wife will love you long time.

Did the service guy recommend a coil (condenser AND evaporator) cleaning?

This will make a unit run more efficently and at lower pressures,extnd the units service life.

Just a thought,good luck.
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Old 04-14-2013, 08:33 AM   #10
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How many pound refrigerant to raise from 60- 70psi?


thanks for reply, I have question regarding TIF leak testing. how does this work and usually how long does it take to detect leak? My HVAC guy went to the attic and after five minutes he came back saying that it detected a leak in the evaporator coils and charged 65 bucks for the five minute test. But he said there will be no way to repair it and only other option was to replace it with a new one -- which can cost upwards of thousand dollars. He said before thinking about replacement he will shoot up some Leak Stop Seal for 120 bucks. So I went with the Leak Stop spray. After adding r-22, leak stop: the AC is running cool but I just hopes it stays that way. Also does the Tif leak test specify which area the leak was from, I mean how was he able to determine the leak from from the coils when he did not visually look for the leak at the coils?
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Old 04-14-2013, 09:04 AM   #11
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How many pound refrigerant to raise from 60- 70psi?


thats just the way it is in our biz. you cannot physically get at the spot where the leak is and have to trust the leak detector when doing coils. TIF has been around 4ever and is a good machine. it is a VERY sensitive sniffer which can pick up leaks as small as 1 ounce/yr. Beenthere is correct if you have a long liquid line then it will take at least 1 lb to get it up 10psi and 2 lbs sounds reasonable to me. depends on the load on the machine/house temp and humidity/outdoor temp and a few other variables to get the operating pressure. I would expect 65 or higher on that type of day.
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Old 04-14-2013, 09:04 AM   #12
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How many pound refrigerant to raise from 60- 70psi?


I'm leery of any tech that says he cant fix a leak.

If the unit is old,this stuff is a band aid that may buy you a year or two.

This stuff can,not necessarily will,clog your TXV or Filter Drier,an indication would be low suction pressure/high superheat.

Find a new tech/company if you run into a problem in the future.

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