Flair 2008 News Letter, Page 2

System-Mismatching



     I've been asked the question many times "Do I have to change my complete system when my air conditioner fails?"

     The answer is not as simple as yes or no, but is much more complicated.

     In short, for a new 13.0 SEER heat pump system to work properly, you do need to change the complete system. The reason for this is because the new air handler's evaporator coil has a greater face area and fin density to match the new outdoor units. They also use a hard shut off TXV (thermal expansion valve) a variable refrigerant metering device that improves compressor reliability, matches more accurately refrigerant flow per load condition, and limits refrigerant migration to the compressor during the off cycle.

     Tests conducted by major manufacturers and a utility company showed that when a new outdoor unit was installed on an older air handler system, a significant efficiency and capacity loss occurred resulting in poor comfort and performance, and a higher utility bill.

     However, there are existing air handlers that can work properly with the new outdoor units.

     These air handler models are still the same as a few years ago, and still have an approved ARI (Air Conditioning & Refrigerant Institute) rated match.

     There are also some air handlers that when adapted with an approved TXV per the manufacturer's recommendation, can be used with a new outdoor unit.

     In general though, when changing an outdoor unit you must also change the indoor unit to achieve the desired cooling and heating capacities as well as the higher efficiency ratings.

     Our comfort specialists are knowledgeable and have the necessary technical information to determine if an existing piece of equipment can function reliably and as designed when only one section of the system is replaced.

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