well, depending on where you live you need to be certified to work with refridgerants such as R134a (its illegal to leak the stuff into the open air; old refridgerant must be recovered)
are there any valves on the pipes?? there should be at least one somewhere for evacuating / charging...
as far as the condensor and evaporator, you should be able to unscrew the lines from them...it depends on the setup i guess tho. ive only delt with car AC systems....
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