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I recently had a new outdoor unit installed on my central heat and air conditioning sytem. I have had the installer out 3 times and the system still does not operate correctly. Sometimes when it cycles (every other time or every third time) the unit does not blow cold air. Sometimes the unit comes on not blowing cold air and the compressor fan is running but not the compressor. Sometimes after 15 minutes of this the compressor will come on. What is the problem.

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It sounds like the compressor needs starting components installed on it. All a/c units have a run capacitor for the compressor and another one for the condenser fan motor. These motors use these capacitors all the time when the motor is running. However, in some cases, this capacitor isn't enough to get the compressor spinning initially. Starting components consist of two parts, a start capacitor and a potential relay. The starting components are wired in in series with the compressor run capacitor. When the compressor turns on, the start capacitor gives the compressor an extra "kick in the pants" to get it going, then as soon as the compressor is spinning, the potential relay disconnects the start capacitor from the circuit for the duration of the run time and resets when the compressor turns off. Most likely, your indoor unit has a thermal expansion valve (commonly known in the trade as a TXV). This valve maintains a somewhat substantial differential between the high side and low side of the compressor after the system turns off which can be difficult for the compressor to overcome without help. Right now the compressor is trying to come on, can't overcome the pressure, and is tripping it's internal overload to protect itself. Eventually, as the overload repeatedly trips and resets over and over, the compressor will finally get around to a position where it will start once in a while. I am not a gambling man and I would bet you money that this will solve your problem. If you would be so kind as to rate my solution "Fix-Ya".

Posted on Jul 03, 2008

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How a Central Air Conditioning System Works
amn_howac.jpg


Facts:
  • The typical central air conditioning system is a split system, with an outdoor air conditioning, or "compressor bearing unit" and an indoor coil, which is usually installed on top of the furnace in the home.
  • Using electricity as its power source, the compressor pumps refrigerant through the system to gather heat and moisture from indoors and remove it from the home.
  • Heat and moisture are removed from the home when warm air from inside the home is blown over the cooled indoor coil. The heat in the air transfers to the coil, thereby "cooling" the air.
  • The heat that has transferred to the coil is then "pumped" to the exterior of the home, while the cooled air is pumped back inside, helping to maintain a comfortable indoor temperature.
  • Central air conditioning can also be provided through a package unit or a heat pump.

Benefits:
  • Indoor comfort during warm weather - Central air conditioning helps keep your home cool and reduces humidity levels.
  • Cleaner air - As your central air conditioning system draws air out of various rooms in the house through return air ducts, the air is pulled through an air filter, which removes airborne particles such as dust and lint. Sophisticated filters may remove microscopic pollutants, as well. The filtered air is then routed to air supply ductwork that carries it back to rooms.
  • Quieter operation - Because the compressor bearing unit is located outside the home, the indoor noise level from its operation is much lower than that of a free-standing air conditioning unit.





















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Sep 10, 2008 | Amana Heating & Cooling

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