wrong coil
Just for my own education I would like to see what extra components are added to turn an AC coil into a heat pump coil. Since the flow is reversed I would expect some sort of bypass round the TXV.
Attached is a photo of an AC coil as an example of the detail I am looking for.
Just curious!
wrong coil
I believe you can buy a kit that will do just that. Older piston type trane style.( if you are referring to that coil in the picture.) If you are going to convert a standard coil a/c to heatpump, becareful as the a/c coil may not be able handle the heating load as there may not be enough surface area to evaporate (condense) the heat.
Genius = The guy who can do anything...except make a living!
That's why I put the picture in, John!
I'm not sure what the indoor piece is called (I thought coil), but I am just curious to see the indoor piece of a heat pump setup.
I am not thinking of doing any conversion - just want to understand what gets added to a basic AC system to let it function as a heat pump. I have pictures of the outdoor unit and see the reversing valve and TXV added there, was wondering what changed in the indoor unit.
Also, when did Trane change the TXV, and what are the benefits of the newer type?
Can't find a picture, but basically what is added is a by-pass check valve around the metering device (sometimes integral w/metering device):
http://www.iarc.org/~4z5ay/HVAC/tev_3.jpg
Last edited by snewman24; 01-06-2008 at 06:05 PM. Reason: Clarified check valve as by-passing
Thanks for the graphic, ever since I helped a friend of mine that is a pro install my central air I've wondered how the coil we used was made for both heating and cooling. I've never done a/c work besides automotive so I was always trying figure out how you could reverse the role of the evaporator and condenser. Now it make sense!!
On other brands. The TXV is made for heat pumps, and has its own internal bypass.
So you would see nothing different about it.