Question about Carrier Heating & Cooling
Air conditioning requires 400 cfm (cubic feet per minute) per ton of cooling so your old 2.5 ton system would have required 1000 cfm and your new 3 ton requires 1200 cfm. This is not a big change, but if your ductwork is too small it could cause problems. The best way to check to see if airflow is the problem is to check the temperature of the air going in to the system and then check it when it comes out. Take a temp reading with a reliable digital thermometer at the return grill ( the vent that is physically the closest to the furnace that is sucking air in). Then take a temperature reading at the vent that is physically closest to the furnace and that is blowing air out. The target range is for the air coming out to be 18-22 deg F colder that the air going in. If the air is coming out is more than 22 deg colder then there is not enough air moving through the system. If the air is coming out is less than 18 deg colder then the problem is with the system. Potential problems range from improper refrigerant charge or incorrect refrigerant metering to wrong coil/volume ratio which is essentially mis-matched equipment. It sounds to me like you have a company that doesn't really have much of a clue what they are doing. When the company I work for changes equipment in a house to a larger capacity, we always check the ductwork and do the math ahead of time to make sure that things will work rather that throwing things at problems later. Also, when you check your temps turn the system on and allow it to run for about 10-15 min first so that everything has a chance to stabilize and the ductwork has a chance to cool down.
Posted on Jun 30, 2008
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Posted on Jan 02, 2017
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