Question about Ruud UAKA030 Air Conditioner

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250lbs on high side and 35lbs on low side

I believe that theres a restriction on the liquid side. The unit was never turned on in the five years it has been on the house.Also there is no receiver drier in the line.

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Or low refrigerant. In that case you have a leak.

Posted on Jun 23, 2008

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Goodman unit runs and at the a-coil there is a piston where your suction and liquid lines connect. On the liquid side the piston is cold but warm on the other side of piston. A/C unit will not cool.

That piston is the metering device. On the liquid line, before the metering device it is always warm (this is sub cooled, high pressure liquid), but should flash to low pressure, lower temperature vapor once it passes through the metering device. The suction and liquid line never connect together.The liquid line brings liquid from the condenser to the evaporator. The suction line brings super heated vapor from the evaporator to the compressor. Since the unit does run, I'd have to put a gauge on it,but if I had to guess, I'd guess you have high head pressure. Check for dirt or debris on the condenser, check for proper clearance of the condensing unit and check for operation and directional rotation of the condenser fan. This could also be the result of an over charge.

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How do you put in 410a into Ac unit

You turn system on to cool setting and run temp down until outside unit comes on. Then you connect your suction side of your gauges to the suction side of your outdoor unit. Next you connect the liquid(high)side of your gauges to the liquid line on your outside unit(the little copper line). Connect the middle hose of your gauges to the 410a drum of refrigerant. Before opening the suction or low pressure side of the gauges you need to turn the drum upside down and turn drum of 410a on. Then you need a temp reading meter and clamp to read the temp of your liquid line(small line). While charging you want to make sure to release refrigerant slowly. The unit should call for a specified subcooling on unit plate. 7 to 10 degrees. You take the liquid line temp and subtract it from saturation temp on the high side of your gauges.(it'll be the pink numbers on the right side of your gauge.

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1 Answer

Low and high pressure pipes are freezing

Hi, if both lines are freezing on your unit check your filter line driers, you should have one on the suction and high side line. You have a restriction in the liquid line filter. This is something you will need a tech change out for you as it will also have non-condensables such as air and moisture in the system. If you have no filter driers on your system at all, then this is the problem for sure as it must have at least the liquid line or high side filter drier on for it to work properly. I hate to tell you this as you will need to call someone out, but I would make lots of calls and get the lowest estimate as you can. Its not that they will be shade tree mechanics, it is a lot of contractors have lowered there rates due to our messed up economy. Please don't forget to keep me posted and to rate me also as I know you will be kind. I will check in on you as I keep all of the people on files that I have helped, so I will check back with you.
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New unit got leak and it is mistake charge vapor in the high side port for a few minutes and the reading on high side is only 120psi. what should i do to fix

Running only 120psi on the high side is actually pretty low. Most systems operate at 200+psi. Charging the unit on the high side while it is running will actually push the refrigerant back into the bottle and is dangerous and shouldn't be done. Charging the high side with the unit off will not hurt the system, it is just preferred to be charge with liquid, but none the less, it will just push the refrigerant away from the compressor. The only thing that you really have to watch for is charging liquid into the low side since it can ruin the compressor internally. I would say you need to finish charging the system on the low side with vapor and be sure that you have the right amount of superheat. Hope this points you in the right direction!

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Goodman Manufacturing co Model ck60-1c serial no 0001496410 , last night my downstairs was coold but my 2nd level was realy hot was not coold air this morning i went outside i found a piece ice on my unit...

If the fan motor on the outside unit is still coming on and the blower motor on the inside unit is still working properly, and your return air is not restricted (sometimes just a dirty filter), then your problem would be the charge in the unit. If over or under charged, the unit will freeze up, not just outside, but inside too. Have someone charge the unit with refrigerant and you should be okay. If any of the other problems exist, it will have to be looked into more. Hope this points you in the right direction. Good Luck!

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1 Answer

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Hi, what's the pressure on the high side and low side, there could be a restriction in your system, and if there's you can tell by looking at high and low side pressure, restriction could be cause by ice build up in your system, dirty filter drier, or just plain dust. sometimes driers go bad, and you will need to replace it, vacuum, and recharge, but if that's not your problem, check high & low pressure switch, they are normally located on both lines, trace coming from compressor, until you locate switches, they usually have two wires coming from them, they are design to cut compressor off, when pressure is high or low, replace, don't bridge them, are you sure you don't need more freon, trace liquid line (hot one) to condenser in front of vehicle, somewhere along that line, you will find filter drier, usually filter drier has a glass on top of it, where you can see freon passes through it, start your a/c if you're seeing bubbles in there, you need more freon, if glass is clear then it's full. (O.K) good luck.

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Have goodman unit, ac unit running 55 suction, 210 high side. cleaned condenser coils and charge to 10 degrees supercool. suction at 65, discharge 245, why did my discharge go so high

You should have liquid line filter/dryer that maybe restricted or there is a restriction in the orfice inside the evap coil normal operating pressures are 68/ 180

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