Questions about minisplit distance from ceiling, vibration, and noise
Hello! I have a multi-head mitsu hyper-heat system set up:
MXZ-3C30NAHZ2-U1 outdoor unit
All three are connected to MHK1 remote thermostats, with the remote selected as the thermostat used.
1. msz-fh06na was installed 2 inches from the ceiling, meaning it is reallyclose to the ceiling. When they installed it, I marked the height where I wanted them to install all the units which they basically ignored and I didn’t catch until it was too late. The other units are at least 4 inches down, but this one concerns me:
a. is this going to be an efficiency issue? The installers (of course) said it’s not a problem. The manual says 3 1/8 inches minimum, but it doesn’t say why, so that could be just for convenience of access, which brings me to
b. Is this going to be a maintenance nightmare? These units seem like a total pain in the ass to remove the cover from. This just adds to that, but it’s unclear to me if it’s just a little bit of an extra pain, or if it will actually create real access issues down the line.
I will call them to move it if it’s going to be an efficiency or maintenance issue. But I’d rather not move it, as it will leave a hole in the house I’ll need to deal with.
2. the outdoor unit really vibrates a lot during cold weather. I’m not talking during the defrost cycle, just hours of loud humming and vibrating that is annoying to me and my downstairs neighbors. My understanding was that these ought to be virtually silent except during defrost. Do I need to have them look at this? I feel like “it’s noisy” is a pretty vague complaint. Is there an SPL or something I should measure off of it so I can tell them it’s X and it should be below Y, fix please”
The already replaced the outdoor unit once, and at that time I had them move the indoor unit that was in my bedroom to the room next door because the vibration from the outdoor unit was traveling up the lines and buzzing the evaporator coils. The replacement of the outdoor unit did not seem to effect the vibration much, but at least the buzzing is in a different room while I sleep. But it still is weird that the outdoor unit vibrates so much, no? Again, I know it’s a vague symptom.
Thank you for any/all advice. I’ve had some sleepless nights because of this, and I’m hoping to resolve before I just rip them off the wall and go back to gas, ha-ha.
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