I don't believe that you want to mix r290 and 134. If the compressor was deisgned for 134a the seals will dryout and crack if you run 290 due to oil incompatibility. You can run small amounts of 134a in a r22 (290) systems without many problems. Compressors are designed to only run a specific type of refrigerant. Therefore using the wrong combination can have bad results.
I don't know too much about HVAC though. I like the bennifits of r290 though. If you can, run it. It is so much better efficiency-wise, it is enviromentally friendly, and it isn't toxic when mixed with water or burned!
Good luck. What are the specs of the compressor?
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