I have an amana air conditioner 2.5 ton ouside unit. Coil measures 130' degrees. How do you clean this. I was told it's clogged and should be 95 degrees.

probably a tonnage issue. unless you have 12 inches of insulation in the attic i like to go with 400 sq. ft. per ton in the houston area. our humidity is so high it will not keep a cold enough coil to wring moisture out of air. all a/c systems are designed to operate at 95 degree ambient. when you get to 102 and more the effienecy drops off quick.

the psi on your unit will fluctuate ...dirty filter will cause it to be lower'' high humidity will cause it to be higher,,, the perfect scenario is 95 outside, 75 inside with 50 percent humidity,,, then it should read 68 psi which is a 40 degree coil temp. only when these conditions are perfect will your psi be 68psi

Hello, some units have a condensate safety switch that will cut off power to the thermostat when the drain line is clogged, A wet/ dry vac must be used to clean out the drain line before the thermostat will receive power again. Amother reason could be either a blown fuse or burned out transformer.

There are alot of factors when dealing with this problem. Heat Load ( Typical A/C unit is designed with a split of 20 degrees farenheit.) If you measure the temperature leaving the discharge registers, the temperature should be around 20 degrees colder than the air entering the return air grille (Filter Location). Also your unit seems to be a 3 ton; In which this system is designed for roughly 450 sq. ft. per ton and can go as high as 550 sq. ft. on newer homes with more than adequate insulation values. On older homes with minimual insulation the 400- to 450 sq.ft. rule per ton should be observed. Another reason could be that the units needs servicing like a dirty condenser coil or evaporator coil, improper refrigerant charge, etc can all be issues that can result in your problem.
Finally, most typical units or designed to maintain a home 20-25 degrees below outside temperature. Example 95 degrees outside, inside should not be set lower than 70 to 75 degrees, and the 5 degree range depends on the SEER (Seasonal Energy Efficiency Rating/Ratio ) of your unit. Hope I was helpful in giving you some direction in things to look for to resolve your problem.

Hello, the evap coil will freeze from either low airflow or low charge. I would clean the coils, check air filter and replace or clean if dirty. If you have a thermometer measure the air entering the ac and the air leaving the ac, the differance should be 15-20 degrees, measure this after cleaning the coils. If it still is below 15 degrees the unit is underchraged.

It sounds like you are low on charge. I think you have a thermostatic expansion valve and you need to check the subcooling, you should have 12 to 15 degrees at 95. At 95 degrees your head should be about 280# for a 12 or 13 SEER unit or higher depending on the effeciency. At 78 to 80 degrees indoor depending on the humidity, that is normal. The valve will open to try to fully feed your indoor coil and it sounds like your head pressure is to low to force enough refrigerant thru the coil.

If properly charged your unit should perform fine, having a dirty condensor at that temperature can cause problems not easily recognized.

A well insulated house should be able to maintain a 20 degree temperature difference whether its summer
or winter. No Mechanical cooling or heating involved
for at least 6-8hrs if not more.

If it never cools when it is 95 degrees outside the ambient outside temperature is not the problem.
At 95 degree out side air you should be seeing inside discharge air temperatures betwenn 48-55 degrees.

It is the load in the house that determines how long the unit will run at 95 degress.

Its done all the time. It is sometimes better to do this because you run a colder coil and rmoves more humidity. The newer unit have variable speed fan and run slower to do the same thing. Remember the lower the humidity the higher you can raise your tsta. Example In arizona at 95 degrees you dont feel the heat as much because of the lower humidity. Its ok to do so. You get more btus out of your unit that way. Rus. I have dozens of units with air handlers 1/2 ton smaller...

Check and see if it is froze up. Check big line at outside unit for ice. check filter and replace as needed. Check outside fan to see if it is running. Wash out outside coil If fan and compressor are running and has hot small line at outside unit. If not froze up and coil is clean you will need to call in a pro. If compress over heated you may need to wait for it to restart if coil was dirty. Again make sure out door fan and or unit is running and clean.

If your sure on the psi your low on freon or your evaporator is restricted discharge psi would realy help.you will get best performance with a clean unit or pay expensive utility bill . Tom