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Old 07-23-2008, 09:56 PM   #1
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AC Unit Running All The Time Data Captured...


Hopefully someone can help me troubleshoot my problem. My Carrier unit runs all the time during the day and sometimes falls behind keeping up with the set point on my T-Stat.

Details listed below:
4 Ton Single Zone System made by Carrier and installed in 1996
Single Family Home 1975 Sq Ft two story cathedral ceilings

Today’s Readings at 5:00 PM
Oustide Air Temp 80 Degrees
Suction Temp At Condenser – 59.2 Degrees
High SideTemp At Condenser – 83.8 Degrees
Suction Pressure – 66 psi.
High Side Pressure – 255 psi.

R-22 Freon
I calculate my superheat at 20 Degrees

This evening my return temp at the return grill was 64 degrees and the supply temp at a register was 56 degrees. Only 8 degrees differential

Is this unit low on Freon? Or is there something else going on?

Any help would be greatly appreciated.
George
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Old 07-24-2008, 12:32 AM   #2
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AC Unit Running All The Time Data Captured...


The head pressure seems a little high for a 80 degree day, should be around 210-220 psi. Have the condensor coils been cleaned recently?
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Old 07-24-2008, 06:04 AM   #3
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AC Unit Running All The Time Data Captured...


They have not been cleaned but they look quite clean and the filter of cource is new.
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Old 07-24-2008, 08:51 AM   #4
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AC Unit Running All The Time Data Captured...


Use coil cleaner from a a/c parts house, the kind that comes in a gallon jug that's concentrated. The directions say to mix it with 1 part cleaner and like 5 parts water, but the owner who also services a/c's said to use a gallon pump spray and mix it 50/50 (or you will have to repeat this process several times). I took the top off my trane and sprayed this stuff on the inside of the coil....this stuff foams up like crazy and be careful on a windy day not to get this stuff on you. I thought I had clean coils til I used this stuff, all the foaming action actually revealed all the grap that had accumulated on my condensing coils thru the years. You wait about 5 mins then gently rinse with a water hose. Afterwards, the temps coming out of my vents lowered about 5 degrees.
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Old 07-24-2008, 08:36 PM   #5
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AC Unit Running All The Time Data Captured...


sub cool 35 . you either have a very dirty evaporator coil and assuming you dont are the gauges fluttering if so you have non- condensables . simple test is to turn the system off let it sit for 1 hour or so and put your gauges on the saturation temp of the refrigerent should equel the out door temp on the dot ,if not you have none condensable gas in the system this can cause ice in the lines causeing temp. restrictions . if thats good you likely have a plugged expansion device these can be cleaned if its a piston if its a txv they need to be replaced
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