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Posted on Jan 02, 2017
SOURCE: 5 ton goodman ac unit
You MUST WEIGH IN THE NEW CHARGE OF R-22. There should be a label on the side of the a/c unit that states what the factory charge was. This is only a starting point. Once you have the factory charge in the system, then turn on the unit and allow it to stabilize (5 min) . Check pressure on low side and check teperature on low side pipe. Temperature of pipe should be 8 to 15 degrees above what the boiling point of the refrigerant is for the current pressure you are reading. If the temperature is more than 15 degrees, add R-22 in 4oz increments allowing 5min in between each time you add until you are in the "zone". When you do this, your head pressure needs to be 225-250. if you need to cover the coil or block the outdoor fan to do this then do it. Hook up the vacuum pump and start over
Posted on Jun 18, 2008
goodman makes the cheapest unit on the market bar none. they are the absolute lowest end of the scale when buying a system. they are for that reason the best selling unit in the industry. so you should expect loud and clunky performance. expect only that they will perform, but dont even begin to expect them to perform quietly or smoothly. your warranty is only a year on these cheap pieces of equipment compared to a 5 or 10 year parts and labor warranty on trane and am standard equipment,so the labor will eat you alive on the cheap stuff. and when the expensive parts fail they will be really expensive.all compressors are now manufactured by about three compressor manufacturers, copeland tecumseh and bristol. so what ever brand you buy will have possibly the same compressor in it. all ac s in recent years have expansion valves that require a hard start kit. many cheap sluggo installers will not add the required hs kit even though they know it is needed and required by the manufacturer. so if the txv ( thermostatic expansion valve ) is a non pressure equalizing valve it has trouble starting against unequal pressure and voila , the compressor wont start. i have seen many a dumb+++ add a start kit to boost starting torque when the oem run capacitor is in fact weak or bad . if run cap is weak (test it) the start cap will temp fix. but you have not really fixed the problem if the run cap is bad eventually it will fail then no start again etc. despite the fact its a year old heres what you need to do. check filter for cleanliness. vacuum out drain for clean and clear drainage, run unit 15 minutes on a warm day , check run caps on fan outside and on compressor outside . they should be within 10 percent of rated mf values printed on side.feel suction line, cold? ok. not cold? call a pro for under charged or inefficient compressor. if cold then look at contactor points. they should be clean and golden colored. no char ,no gray or dark areas. a pro can tell with gages if charge is low or compressor is weak. as high pressure falls off and gets low ,suction pressure gets weak and rises. this would be a weak or bad compressor. as head ( high) pressure falls and suction pressure also falls this would be a case of low ref charge. you as a home owner can stick a cheap thermometor in the incoming and outgoing duct and expect to see a difference of 20 degrees . less equals low charge, or weak compressor,
Posted on Oct 12, 2008
Sounds like a bad capacitor. They can be bad and the fan will still run. Turn off power and check for burnt wires on the top of the contactor going to the capacitor or on the top of the capacitor.. Check terminals on the compressor also. When capacitors go bad they are slightly swollen. They can also look good and be bad . Could be compressor but start with capacitir and wires. IWork on a lot goodman units. Most of the time it is the cap.
Posted on Jun 03, 2009
are you speaking of the outside fan or inside? compressor should be a little warm but not boiling hot. the unit could be low on freon. if low it will run a while but the compressor will overheat and shut off leaving the fan running by itself ouside. if nothing outside is running check power. if you have power check the contacted outside to make sure it's pulled in. contacters are bad about going out on goodman untis. Also ants can get under contacts.
Posted on Jun 18, 2009
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