Question about Heating & Cooling
I agree with roger
Posted on Sep 28, 2012
Due to the many different questions I see about Air Conditioning, I am including this overview to help us better understand each other for trouble shooting. A basic air conditioning system has a Thermostat, Air Handler or Furnace Fan and a Condensing unit. In a split system, the condensing unit (Condenser) is separate from the furnace and usually in the back yard. When working properly, it blows hot air. It connects to the cooling part of the system by 2 copper lines. One large line and 1 small line. The part that cools the house is the "Evaporator" and is usually on top of the furnace inside the square metal box (Plenum). When the Air Conditioner is running, the large copper line should be cold and the smaller line should be warm. Common signs of low refrigerant are that both lines are the same temperature and/or frost or ice has built up on the large line at the condenser. The thermostat will normally display room temperature on till it is touched to change the setting. It could have a "Span" setting as well as times and temperatures. The operating "span" of MOST residential thermostats is 40 to 90 degrees. That means you can set it as low as 40 degrees and no higher than 90 degrees. It probably has a fan switch also. When in the "ON" position, the fan will run constantly, 24 / 7, but the condenser will still cycle on and off as needed to keep the house at set point. If you have a suggestion to include in this paragraph, please let me know. Roger
Most condensing units have low pressure safety switches in them. If your system is low on refrigerant, the compressor will run a little and shut off. When the pressures across the compressor equalize, it will come back on. This cycle will repeat on till enough gas has leaked to stop resetting the pressure switch. If this is what is happening, shut the condenser off. Short cycling will over heat the compressor. You will need a technician to find and fix the leak. Also to recharge your system when repaired. Let me know if I failed to help. Roger
Posted on Apr 10, 2011
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Posted on Jan 02, 2017
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