Minisplit Maintenance Costs and Schedule
What’s a reasonable expectation for how often a mini-split needs to be serviced? And what’s a reasonable cost per unit? How often do units develop noise issues after cleaning?
我要问，因为我们被告知我们的单元（天花板上的三菱单向无管，MLZ）需要清洁非常两年左右的时间。费用为每单位$ 400。我们有六个单位，因此平均每年为1200美元。更不用说调度/适应凌乱的清洁的麻烦了。
我们遇到了冷却问题，他们检查了线圈，并注意到其中有很多灰尘，解释说导致性能降低（因此它们正在充分冷却）。
Now, all of two weeks later, two of the cleaned units have developed loud buzz noises. The diagnosis is that the sealed motor units need to be replaced. And that happens fairly frequently, which is why the cleaning cost is high … Oh, and it’ll be 10 days until they can be fixed (can’t sleep in the bedroom again …)
I had hoped that the dust issue was to do with un-level ceilings causing by-passing of the filter, something now fixed (by adding ugly weather stripping). But now they are saying that even wall mounted units have a similar schedule and tendency for the motor to need replacing after cleaning …
所以我在这里寻找一些经验？都是这样吗？只是MLZ单元吗？还是这是不良安装和/或不良清洁的结果？
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我的天花板安装座的经验为零，但是将用于交流电的壁挂式安装座，鼓风机轮需要清洁每6年。这是耗时的工作（拆开，卸下鼓风机，洗涤，重新安装），我还没有找到一种很好的方法。
嗡嗡声听起来不像是坏马达。通常在电动机上发生的是轴承，会倾向于尖叫。嗡嗡声听起来像是没有正确的振动，没有绑住的宽松的电线，或者有人弯曲了鼓风机。我打电话给BS BS在清洁后需要立即更换的鼓风机上，有人打破了一些东西。
If you can find a better filter in there, it will last longer. I put a standard furnace filter on mine in my bedroom mostly to reduce the air flow, but as a side effect it has been staying significantly cleaner than the other ones.
Akos, are you talking about wall heads? What kind of furnace filter can you put in there?
谢谢，比尔
我使用了一个大型标准Merv 8炉过滤器切成两半。这是贴在设备顶部的胶带。大小与顶部的现有开口相匹配。不是最漂亮的，因为您看不到头部高度。
阿科斯是对的:)
为了跟进这里，我们终于与安装人员及其工作人员一起获得了区域代表（我认为批发商）。花了一天的时间来处理“嗡嗡声”问题。尝试的事情：
- 在非运动端重新安装索环（橡胶中间有塑料可以转动，我们的镜头在视觉上被错过，但没有修复）。
- Replacing the grommet at the non-motor end with a new one.
- 确保电动机和塑料风扇之间的距离与工厂单元相同
- 完全替换电动机（批发商带来了新的MLZ进行比较）。
这些都没有工作。每次尝试后，都残酷地看到努力和噪音不变。房间里安静（好的，嗡嗡作响...）
Eventually "strategic pushing on the motor end" with a screwdriver established that it was vibration between the housing and the metal frame mount. I believe the solution involved re-seating a rubber isolator for the motor housing and possibly rotating the motor in the housing so nothing contacted the housing. I suspect it's pretty easy to get this housing seating screwed up when jostling around to remove the fan wheel, since it's super tight in the MLZ units. We have two other post-cleaning units to fix still (one of the cleaned units went back together properly and didn't buzz, which was key to comparing).
Props to mitsu and the installer for sticking with this one and not gas-lighting me about the noise being expected/within spec :) The wholesaler/rep had pushed up through Mitsu global to seek a solution but nothing seemed to be known.
(note for future searchers: The MLZ units still make too much random noise for use in a bedroom, though.)
So Akos was right. "something was not put back right and vibrating".
嘿詹姆斯，
我在客厅里拥有一个MLZ单元。虽然我没有得到“嗡嗡声”的声音，但是当设备达到所需的温度并停止吹空气时，我会得到点击和收缩/扩大噪音。您也会得到这些噪音吗？在加热模式下，噪音似乎更为突出。
I'm wondering if the units with the fan in front of the coil (think ducted or floor mount) might be less prone to mold build up on the fan. The wall mount units generally draw through the coil which places the fan in the danger zone for mold and getting wet. I have a wall mount and am dreading the eventual cleaning. I'm thinking of laying some filter media on top of the air inlet to hopefully keep the insides a bit cleaner.
我都一个地板安装单位和一个墙挂载。The floor unit is like 10 times easier to take apart and get to the fan to clean. It is also vastly superior in heating mode as it has an outlet out the top and one out the bottom. Here is a picture from when I installed my floor unit of the fan. The black cover comes off easily with 4 Phillips screws to access the fan.
这是当我看迷你切片时让我关闭的事情之一。大多数都有一个非常w弱的过滤器。尘埃是HVAC系统的致命敌人。而且我喜欢有一个不错的大滤镜，可以将灰尘从空气中取出。随时给我一次性。
Good to hear the Mitsubishi came through. It doesn't sound like a big item, but these kinds of issues can make a big difference for the home owner.
I'm starting a new project and going with ducted units with big filters. Maintenance is a pain, simpler the better, don't want to deal with blower wheels again.
在此之前，我一直在看一些天花板单元，看起来有些人可以接受1英寸百褶过滤器，不知道它们是否具有足够的鼓风机能力来推动足够的流动。
下次我必须清洁鼓风机时，我将尝试用气枪将其吹扫。带他们出去正确清洁它是太多的工作。
The problem with using an air gun is all that dust goes right back into the room where it will end up right back on the blower wheel.