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I was able to get the heat recovery chiller to work in the openstudio bindings by manually editing the chiller in the workspace object.

First I created a temporary pipe on the heat recovery loop to set up the nodes and branches on the supply splitter/mixer.

Then I added the node values from the temporary pipe object manually in the chiller workspace object.

    chiller_object = workspace.getObjectsByName(str(chiller.name()))[0]
    chiller_object.setString(24, str(temp_pipe_inlet_node.name()))
    chiller_object.setString(25, str(temp_pipe_outlet_node.name()))

I edited the branch that contained the temporary pipe to point to the chiller and then deleted the temporary pipe from the workspace. I added the other relevant inputs and objects through the workspace that are necessary for the heat recovery chiller object to operate properly.