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Thread: Noise issue with a Fujitsu split
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12-07-2020, 11:36 AM #1
Noise issue with a Fujitsu split
Hi,
I’ve been reading the forum for a long time and I've learned a lot: thank you! This is my first post.
I’ve just had installed a 3x1 FUJITSU mult-split system: two 3,5Kw units, and one 2,5Kw unit. Split 1 (3,5Kw) is about 70 cm from the compressor, and splits 2 and 3 are about 7 m each one. Vacuum and leak tightness nitrogen tests were completed (in that order).
The thing is that split 1 makes a noise, and I’m not sure if it’s normal. It doesn’t seem to be the typical plastic “chirp”, but instead it’s like a conduit noise or like circulating fluids (gas?). Just one split makes the noise, the one closer to the compressor. On the other hand, it seems to work fine. The noise appears at the beginning, then goes on cyclically, and it can also be perceived at the end, even when the electric current is switched off.
I hope the noise can be heard in the video:
https://www.youtube.com/watch?v=ATnpW4y3UOk
It appears at second 50’’: then the expelled air hides it more or less. When the split is turned off, after minute 3, it keeps on and is still clearly audible. Is it normal? If not, what it could be the reason?
Any advice would be gratefully received.
Thanks!
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12-07-2020, 09:02 PM #2
Re: Noise issue with a Fujitsu split
Hi,
Could it be the short pipe?
Fujitsu reccomends minimum pipe lengths:
https://www.fujitsu-general.com/uk/s...plit/0220.html
What happens if piping is less than the minimum recommended length (3 metres / 5 metres)?
If the product is installed with less pipe work than the minimum requirement specified by Fujitsu engineers, noise and/or vibration issues may occur and also the system may not perform as well as it is designed to. Fujitsu will not cover warranty claims for issues caused by units not being installed in accordance with their manuals.
https://www.valleyairconditioning.co...s-brochure.pdf
Could you check the pipe lengths for your unit in the service manual?
best regards!
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13-07-2020, 12:41 AM #3
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13-07-2020, 05:17 AM #4
Re: Noise issue with a Fujitsu split
Awesome!
Are you going to put the longer pipe?
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13-07-2020, 01:05 PM #5
Re: Noise issue with a Fujitsu split
Yes, I'm. The idea is looping the additional pipe run behind the outdoor unit. It's hanging on the wall and there seems to be enough room.
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15-07-2020, 01:02 AM #6
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Re: Noise issue with a Fujitsu split
Some time ago, when I was instaling split systems, I was dealing with that problem by making simple muffler out of copper pipe of higher diameter and copper end caps fort hat diameter with brazed pipe of reqired liquid line diameter at the midlle!
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30-07-2020, 10:10 AM #7