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Re: Plastic uninion at copper line
Eric,
Tell them to double check that it is still connected to the water heater first.
Usually, the refrigerant lines are just disconnected and the water lines are left connected. That is not a problem, just reconnect the refrigerant lines, adjusting the refrigerant to the correct pressures.
On occasion (rare in my experience) you will find what they did in the house we bought up here - the plumbing lines to the water heater were also disconnected (because the previous owner replaced the water heater).
My guess is that a previous owner replaced the a/c, which is when the heat recovery unit was removed from the refrigerant circuit. Then, the plumber who replaced the water heater traced the lines out and found the abandoned heat recovery unit, so they disconnected the plumbing lines ... and cut them off and poked them back into the wall/attic.
Now, it will be double trouble to try to re-connect it all.
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