barlyhop Posted April 4, 2010 Report Share Posted April 4, 2010 Up in da nort here eh we have a lot of condo's with combination heating/AC systems. The units are completely sealed except for access to the filter and condensing coil. I have found that the average life expectancy of these units is relatively short, 10-12 years or so. The heat exchangers tend to crack at that point. I am looking for advice on the best way to inspect these units and what equipment might be beneficial to do this. It seems that the temp differential between supply and return are one sign of early failure but are there other symptoms? Why do these units fail much earlier than a split system? I have found most units to be Armstrong or Goodman. Also, most of these if not all are located in a closet or just framed into the room with no intake air available from within the confined space, I never see vented openings to the interior for intake combustion air, since the units are exposed to the exterior I assume that intake air is drawn from the outdoors. Installation guide would be nice to review, etc. Thanks Randy Quote Link to comment Share on other sites More sharing options...
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