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Every year i get my central air unit serviced and they add R134a refridgerant to it. i was wondering how hard it is to do this, i change all my filters in my furnace and air flow is good, i just can't see spending $60 an hour for something i can prolly do myself.

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Ok first off you will need to know the expansion rates of refrigerants vs. temperature rise and gain. Next you need to know some algebra to equvilate what said pressure should be by temperature and type of refrigerant. Next you will have to find a place to take the EPA exam, then if you pass with an 75% or higher that step is complete. The next step would be to study for the B&A Exam this is a 6 hour exam that you must pass with a 80% or higher where I live. To take this exam you will need to spend $2500 on course work and another $4000 to $5000 on books. Then if you pass that exam the next step will be to buy a truck and tools this may range anywhere from $50,000 up to and sometimes above $150,000. Oh and I forgot that you will also need to get bonding insurance mine costs around $10,000 a year. Oh yes you will need a building as well that should be around $2500 a month. So there you go for around $122,500 you could get started on adding your own refrigerant. Please dont take this the wrong way, I get gripes all the time about my billing rate and it is $132.50 an hour but we have a lot to lose with our investments, and future investments.

Hope this helps Ya.

Posted on Jul 06, 2008

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I remember Carrier came out with a 134a unit years ago but didn't sell very well here in TX. and I have never ran across one if this is a central air unit. If room a/c then there area alot of them. Get the leak fixed and you shouldn't have to add any. Anyone can buy 134a but then you would have to learn the pressures and buy a set of gauges, not a widow maker,( those cheap 1 hose and gauge setup that screws on the can)

Posted on Jul 06, 2008

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1 Answer

I have central air and I was wondering how do you put freon in it because its not blowing out cool air


Is the compressor starting? On the outdoor unit you will see a large copper pipe and a small copper pipe. Is the larger of the two cold to the touch? wet? Just because a central air system is not blowing cool air does not mean it needs freon. If you have clogged filters it cannot do an air exchange. So, I would recommend checking the easiest things first before adding Freon.Most people make the mistake of adding Freon and overcharge their system. In a low load situation you can slug the compressor with liquid and your system is ruined. If you do have to add Freon it indicates that you have a leak. An AC System is a closed system and if it is working properly you should not have to add Freon.

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My A/C blowing air, but it is not cool. It has started freezing up. We just replaced the air filters and since then it is freezing up. We even gently cleaned the a/c coils before replacing the filters. ...


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1 Answer

Central A/C takes a long time to cool house


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You need to go outside and feel the suction line (the big line) with the unit running, after the house is cooled down, it should be cold and sweating,if the humidity is not to low, if it is your unit is probably ok. High Effeciency units
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1 Answer

Wont blow cold air


First check and clean the filters, and the evaporator coil. (thats the "inside" coil that has the indoor air sucked through it, cooling it and then pushing it out the vents.

If the filter is clogged or the coils are dirty, it will not cool properly and potentially freeze up.

Also check the condensor (outdoor) coil, if it is dirty/clogged, it will run hot and not cool properly.

If all coils and filters are clean, and the fan motors are running and in good condition and it is still not cooling then you are likely low on refridgerant. (handling/purchasing refridgerant other than R134A requres a CFC certification by law)

Aug 20, 2009 | Air Conditioners

3 Answers

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The compressor is not starting either because:
1. The compressor has gone bad
2. The system is low or out of refridgerant. There may be a slow leak, when there is no refridgerant in the system the compressor will not start.

Fix:
Re-charge the system with appropriate refridgerant, if the system has a charge already or holds a charge when you charge it then the compressor should start.
If not the compressor could be bad, sometimes you can get a hard start kit instead of replacing compressor. If the system does not hold a charge then you have to find and repair the leak before anything else...

Good luck. Please give good rating, it meens a lot to me....Feel free to contact me again...

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1 Answer

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All new blowers are sealed units you really can not oil them. By the time they start howling it is to late. Now some evap motros inside have two small plastic plugs on the motor. The outside one is easy to oil the inside one is blocked by the fan. Very hard to get to without pulling the fan. My suggestion calla service tech and ask for free estimate on motor service or replacement.Russ

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1 Answer

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No that would be either a dirty filter/coil ir low refridgerant if it's freezing in cooling mode.

Clean/replace the filter, clean the coil and if it keeps doing it, have a technician who is EPA certified for servicing systems with refridgerant to look at it/add refridgerant.

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