LG Installation Technicians Seem Lazy/Incompetent. Need Advice Before They Return Today.
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Hi everyone,
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I recently purchased a 2-ton LG inverter AC and had a rather frustrating installation experience. I wanted to get some feedback from people who are more experienced with AC installations before the technicians come back again.
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Yesterday, two LG installation technicians came to install the AC.
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They mounted the indoor unit on the wall, but when it came to the outdoor unit, they said the wall bracket/stand available was too small for the new compressor. Instead of mounting it properly, they suggested simply placing the outdoor unit directly on the roof and leaving it there without fixing it to any stand.
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They claimed this would be fine and also mentioned that ventilation would be better this way. Since they were the technicians, I initially agreed.
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They then connected the copper pipes between the indoor and outdoor units.
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At that point, I asked them whether they were going to vacuum the system. They looked surprised and told me that modern LG ACs are "self-vacuumed" and that vacuuming was not necessary.
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However, after reading many discussions here and elsewhere, I was under the impression that proper evacuation with a vacuum pump is extremely important for removing air and moisture from the refrigerant lines.
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I insisted that I wanted vacuuming done before commissioning the AC.
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They then said they would have to come back later with a vacuum pump.
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By the evening, my father decided that the outdoor unit should be mounted properly instead of simply resting on the roof. We visited multiple shops in the nearby city looking for a larger bracket, but apparently the one already available was the biggest size we could find.
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Now the technicians are saying that since the copper piping has already been connected, attempting to mount the outdoor unit now could damage or break the copper pipes.
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My questions are:
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Is it true that mounting the outdoor unit now carries a significant risk of damaging the copper pipes?
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If the outdoor unit is currently resting on the roof, is that acceptable long-term or should it definitely be mounted on a wall bracket/stand?
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Apart from vacuuming and a soap-water leak test, what checks should I perform to ensure the installation is done properly?
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Are there any common shortcuts or mistakes that LG technicians frequently make that I should watch out for?
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Should I ask them to perform a nitrogen pressure test, or is a vacuum + soap-water leak test generally sufficient for a standard residential installation?
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I'd really appreciate any advice from HVAC professionals or experienced users before the installation is finalized.
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Thanks!
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