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hi i am dan i can help you with this the most direct replacement would be a CR28K6e-pfv. if you want to go with a scroll and have the room you would need a ZR28K5E-PFV. here are some links for you. let me know if this helps or if you need more information.
one thing i would say is this is not a normal DIY repair as it will require at least basic refrigeration knowledge and special tools like a recovery machine vacuum pump, gauges. also you will need to get refrigerant which can only be sold to someone with an epa certification. an epa certification is also usually required to purchase anything for refrigeration like compressors but some places do sell them to anyone. both of the links i provided in my last response will sell to homeowners. next compressors are mostly universal based on the size. there is no differance between a heat pump compressor and a straight ac compressor. the only difference with a heat pump is a reversing valve and a defrost board. your existing compressor is a reciprocating compressor like the CR28K6e-pfv from copeland. the ZR28K5E-PFV is a scroll compressor which is taller and different piping for it. sometimes people like to upgrade to a scroll compressor because they are very reliable. but they may not fit in your condensing unit. you would have to measure it and make sure it will fit and then redo the piping to it. the CR28K6e-pfv will defiantly fit in your condensing unit but because you want to go with copeland instead of bristol there may be some modifications to the piping required. as far as the cross reference i just use the cross reference charts from copeland to determine the correct size compressor. also keep in mind you will need a new filter drier and capacitor and i always recommend putting in a new contactor too. also if it was a burnout compressor you will need to flush the system and install a burn drier and suction drier. now with all of that said you can see it is a very involved process and you are replacing 90% of the system. at that point i usually recommend replacing the whole system or a more cost efective option is to replace just the condensing unit. that would take the same amount of time and less work and cost just about the same maybe a little more but you get a new warranty and basically a new AC unit minus the indoor coil. but the decision is up to you entirely all i will say even with me being a tech and getting all the parts at wholesale price and having all the tools i would still just replace the condensing unit instead of just the compressor if it were in my house. let me know if you have any more questions. i will also offer you the option of accepting a live phone call if this would be easier for you to get more information and a better understanding.