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Excessive sweating of lines - Air Conditioners

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Posted on Sep 13, 2008

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Unit not cooling inside below 72 degrees lines sweating


how hot is it outside??? 20 degree split is usually the norm ,,,,,outside 95 then inside will be 75,,,,,where is the line sweating ,,, it should sweat near outdoor unit

Jun 02, 2014 | Ruud Central System Air Conditioner

1 Answer

Cant find refrigerant weigh in diagram. I don't know how much to add


On your name plate of A/C unit it will say the unit is factory charged with so many ounces of refrigerant. It will say the weight in ounces depending on the length of your line set you may or may not have to add freon. usually if your line set is longer than 20 ft you will have to add freon. The best way to charge an A/c is to wait for a hot day and charge the unit until it sweats back on your suction line the big insulated line. when the line sweats back to the compressor stop charging unit you will be fine. If this helps please rate me and give me a testimonial.

May 17, 2011 | Goodman Air Conditioners

1 Answer

What is the a/c charging pressure on roof top r/v units?


The easiest way to charge a unit is to add freon to the low side until the line sweats and the coil is sweating top to bottom. The pressure depends on the wet bulb temp on the low side line the ambient temp outside and the intake temp inside the
RV. A good unit will start to sweat between 50 to 78 pounds on the low side. good luck

Aug 11, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a Ruud 2 ton split system and the system will not cool. The compressor and fan on the outside unit works and the fan blower on the air handler works too. The temp on the lines coming into the...


The small line coming in from the outside unit should be warm to hot and the larger line should be cool and sweating with water forming on it. I am taking for granted that the unit was working if so it sounds as if the unit is low on freon. your inside coil should be sweating a lot from top to bottom if it is only cool or sweating on the bottom but less to nothing up top you are low on freon. When very low the unit will stop working just like a broken valve in the compressor. If it is just a little low it will not cool properly and at night it might even freeze the inside coil up.

Aug 08, 2010 | Ruud Handle Air Conditioner

1 Answer

Pressure readings


the metering device is in the outside unit on mini splits that is why the liquid line sweats. pressure reading depend on load high load high readings i would shoot for arount a 40f suction saturation temp

Jun 26, 2010 | Mitsubishi Mr. Slim MXZ30TN Air...

1 Answer

Unit not cooling well both suction and discharge lines cool dischrcharge line [ small line] sweating


the "Discharge" line sweating on a mimn split is normal all of the flow metering is done in the outside unit . as to it not cooling well are the filters clean? if they are you more than likely have a leak and need to get is serviced

Jun 12, 2010 | Fujitsu 18C1 Air Conditioner

1 Answer

Liquid line is sweating on a R-410 a/c split system is that ok


the liquid line should be hot to the touch and the suction line (bigger diameter) should be beer can cold. you did not indicate if it is sweating inside or outside. if inside, it may be normal if in a high humid area. if outside not normal.

Jun 11, 2010 | Whirlwind FH-778 Air Conditioner

1 Answer

My domectic roof top air con is getting condensation on the plastic cover inside the van


Hi; Is the drain for the condensate draining. You will have to check the top unit to see if water is present. You can also check the air filter to see if it needs to be cleaned. Please only use a household cleaner and hot water on the filter screen. Also what is the inside temp. when You notice the sweating. If Your in a very humid climit some times the unit will sweat until it can remove excessive moisture from the inside space. Also does the tstat seem to be working normally and holding temp. ...alpharome416

Feb 22, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

MY AIR CONDITONER HAS JUST STARTED LEAKING WATER,SPLIT SYSTEM DOGS HAVE CHEWED FOAM AWAY FROM COOPER PIPES ON THE OUTSIDE UNIT


if the water is coming from the cooling coil on the furnace or blower package, that means the drain line is plugged. put a wet vacuum on the end of the drain line for a few seconds, that should **** out any residual sediment collected in the drain trap or drain line. if your concerned about the water collecting on the line that is missing the insulation, that is only sweat from the humid air contacting the cold pipe (suction line)and doesn't pose any problem as long as the exposed line is outside. it would be a good idea to reinsulate the line to prevent the sweat and the refrigerant temp from getting too warm . the low gas temp in the suction line is what keeps the compressor motor windings cool and prevents it from overheating and burning up. Don't let the dogs **** on the condenser (outdoor unit) the urine will corrode the fins and you'll start loosing capacity due to higher discharge pressures.

Feb 12, 2010 | Fujitsu Air Conditioners

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