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I would check with the building department and your insurance about that. Insurance may not pay if there is a fire.
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Kind of ironic that I was working on a mini-split install today. It sounds like your installer may be taking the quick way out by just just hooking up a flared line-set and using the pre-charge in the condenser to fill the system. If you work fast (on a dry day) using a pre-made 15' line-set, the dryer that's usually already installed will handle the small amount of moisture in the lines. If there are no leaks, they can run as intended without a pressure test or evacuation. However if there are leaks, which may take a week or two to be noticed, the system will need to be recharged. On the newer inverter types this may require completely purging the entire system and re-filling by weight, as there's no way to really determine the charge by measuring super heat. If your installer hasn't planned on a pressure test and evacuation, (or doesn't have the tools to do it) then don't waste your time telling him what a bad idea it is to put the condenser in the garage. Don't let him release the refrigerant into the system! It's time for a reputable installer.
Sign at N.E. Vocational School Cabinetmaking Shop 1976, "Free knowledge given daily... Bring your own container"
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To John and all,
A change bringing the compressor out of the garage has been requested.
Paul
Paul from the beautiful mid-coast of Maine (USA)