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modern high eff air conditioners leaking
Posted by Dean [Email] (more from Dean) on Fri, 14 Apr 2006 10:52:59
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There is an industry wide problem with the R410 "Puron" systems. The efficiencies are quite high, but the pressures are way high compared to R22. The low side pressures are 120.
There seems to be a problem with the "furnace coil" evaporator units. The copper tubes are leaking. A new generation of these is coming out that are tin coated, which would seem to be an attempt to fix the copper porosity problem. Things are worse with heat pumps at the furnace coil becomes the condenser and the high side pressure are then creating even higher pressures in the furnace coil.
Along with the much higher pressures, the compressors are more noisy as well. The federal mandate for lowest SEER is changed to 13 from 10, that is also driving higher pressures and leaks. The best units will be 22 SEER, but installer complain that these are getting too big to get though standard 3" backyard fence gates!
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