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Author Topic: Does your Immersun buzz?  (Read 926 times)
mr_magicfingers
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« on: October 08, 2018, 12:38:26 PM »

We've had our immersun for a couple of years now and it's been a brilliant bit of kit. However, it does buzz quite a lot on occasion. sometimes it buzzes pretty strongly but a swift firm tap on the case tends to stop it, at least for a while. Now, while I know percussive maintenance isn't the best way of dealing with things it does seem to do the job. Does anyone else have this issue with their Immersun and does anyone know what might be causing it?
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300l Thermal Store, 2 x 3kw immersions via Immersun + Dunsley Yorkshire WBS
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7 acres of old woodland I'm slowly bringing back into order.
Antman
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« Reply #1 on: October 08, 2018, 12:55:02 PM »

A buzz would imply low frequency 50Hz. This is historically associated with loose cores or laminations in transformers. Not sure what the immersun has internally. I used to identify the source of buzzing using pressure applied from an insulating tool - usually a plastic trim tool!

First thing to check is that all connections are tight especially the power side as a loose wire in terminal will also cause buzzing.

However the immersun is chopping at a higher frequency and thus noise would be higher pitched.
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Antman
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20 x 47mm, 172 l cylinder, Heat Dump, 15 x Sanyo HIT-H250E, SB4000TL,  Nestor Martin IQ13 WBS
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linesrg
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« Reply #2 on: October 08, 2018, 09:09:41 PM »

Good Evening All,

My Immersun has a low volume buzz when working above a certain power level.

Regards

Richard
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16 BP380 on a Lorentz ETATRACK1000/SB1700, 16 Chinese 80W/SB1700, 16 BP380/SMA SB1700. CTC GSi12 + Ecosol + Flowbox 8010e/Gledhill ASL0085 EHS/3 Navitron 4720AL solar ET panels and Immersun T1060/ T1070/ T1090. 7 Tianwei 235W/ Aurora PVI 3.6kW/ Growatt SP2000 c/w 5kWhr battery and a Renault Zoe
brackwell
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« Reply #3 on: October 09, 2018, 07:19:05 AM »

Mine buzzes but i have known the case to resonate but pushing the outside usually stops it. Could try tightening the box screws.

Ken
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mr_magicfingers
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« Reply #4 on: October 20, 2018, 01:34:36 PM »

been investigating this a bit further, it definitely seems to be the large inductors on the left of the unit.



When it's buzzing, moving them slightly stops it. All other connections are tight and the cover is off so it's not that. Not sure what I can do about these. I'm guessing the dabs of caulk are to stop them moving/buzzing but that's not working.
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Solar PV: 6kw (24 x REC 250w), Sunny Boy 3600TL-21, roof facing 178 at 40 slope.
300l Thermal Store, 2 x 3kw immersions via Immersun + Dunsley Yorkshire WBS
Woodwarm Double sided 6kw WBS
7 acres of old woodland I'm slowly bringing back into order.
eabadger
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« Reply #5 on: October 20, 2018, 02:11:57 PM »

i used to be a tv engineer.
reapply shellac remove and dip.
in the field wax may have been applied.
glue gun may work, but be aware, lots of cheap turkish bush badged tvs failed due to glue eating the pcb tracks.

steve
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Antman
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« Reply #6 on: October 20, 2018, 06:28:36 PM »

Ahh - now we see what the innards are like  Smiley

It's vibration of the wire turns against the ferrite cores.

You need 'transformer lacquer' to dampen/stop the movement. RS still sell various insulating varnishes and sprays for this purpose. With a spray, you can mask off around the coils with paper.

If that does not work a bead of neutral cure silicone may do the job. But in both cases, let them fully dry/cure before reapplying power!

Regards
Antman
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20 x 47mm, 172 l cylinder, Heat Dump, 15 x Sanyo HIT-H250E, SB4000TL,  Nestor Martin IQ13 WBS
DIY Solar System Support at http://www.handyantman.co.uk/antman.html
All support is voluntary and free of charge. I'm not employed by Navitron so responses may not be same-day
eabadger
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« Reply #7 on: October 20, 2018, 07:17:20 PM »

'transformer lacquer

shellac, is ..
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1kw wind turbine.
26kw wood stove back boiler to underfloor heating and dhw
linesrg
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« Reply #8 on: October 20, 2018, 07:24:23 PM »

Good Evening All,

I haven't had cause to check what temperature these inductors run at but be careful of 'insulating' them as you may cause heat problems.

Regards

Richard
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16 BP380 on a Lorentz ETATRACK1000/SB1700, 16 Chinese 80W/SB1700, 16 BP380/SMA SB1700. CTC GSi12 + Ecosol + Flowbox 8010e/Gledhill ASL0085 EHS/3 Navitron 4720AL solar ET panels and Immersun T1060/ T1070/ T1090. 7 Tianwei 235W/ Aurora PVI 3.6kW/ Growatt SP2000 c/w 5kWhr battery and a Renault Zoe
Antman
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« Reply #9 on: October 21, 2018, 06:54:23 AM »

'transformer lacquer

shellac, is ..

Yes I know. The point I was making is that if you search for 'shellac' you will get a load of hits for nail varnish.
Searching for 'transformer lacquer' will give a much for appropriate set of hits!
Antman
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20 x 47mm, 172 l cylinder, Heat Dump, 15 x Sanyo HIT-H250E, SB4000TL,  Nestor Martin IQ13 WBS
DIY Solar System Support at http://www.handyantman.co.uk/antman.html
All support is voluntary and free of charge. I'm not employed by Navitron so responses may not be same-day
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« Reply #10 on: October 21, 2018, 07:21:31 AM »

Good Evening All,

I haven't had cause to check what temperature these inductors run at but be careful of 'insulating' them as you may cause heat problems.

Regards

Richard
.

Good point. Lacquer will be OK but we're not talking about encapsulating them. Just a blob or two of silicone should dampen the vibes if needed.
Antman
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20 x 47mm, 172 l cylinder, Heat Dump, 15 x Sanyo HIT-H250E, SB4000TL,  Nestor Martin IQ13 WBS
DIY Solar System Support at http://www.handyantman.co.uk/antman.html
All support is voluntary and free of charge. I'm not employed by Navitron so responses may not be same-day
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« Reply #11 on: October 21, 2018, 09:46:02 AM »

Good Morning All,

I have three sources of noise emanating from the Utility Room;

1. The Immersun 'buzz' - tells me the unit is diverting some level of Solar PV to the EHS (there is a whole let less noise coming from it since I fitted the new fan)
2. the Solar ET 'drone' - tells me that the Solar ET pump is running at 100% - I believe the drone from the EHS is a 'sympathetic' vibration from the solar coil (this by far the most annoying noise)
3. the GSHP 'hum' - the level tells me what kind of rate the compressor side of the unit is working at

Barring No.2 they are no more intrusive than the LPG condensing boiler that preceded them.

Regards

Richard
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16 BP380 on a Lorentz ETATRACK1000/SB1700, 16 Chinese 80W/SB1700, 16 BP380/SMA SB1700. CTC GSi12 + Ecosol + Flowbox 8010e/Gledhill ASL0085 EHS/3 Navitron 4720AL solar ET panels and Immersun T1060/ T1070/ T1090. 7 Tianwei 235W/ Aurora PVI 3.6kW/ Growatt SP2000 c/w 5kWhr battery and a Renault Zoe
mr_magicfingers
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« Reply #12 on: October 21, 2018, 11:34:41 AM »

Thank you everyone. Looks like silicon was used when they were built, i'll look for some transformer shellac and spray that.

There's two sorts of buzzes from the unit, one is reasonably quiet and lets you know it's working but the inductors also make a much louder buzz which is very annoying, that's what I'm wanting to stop.
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Solar PV: 6kw (24 x REC 250w), Sunny Boy 3600TL-21, roof facing 178 at 40 slope.
300l Thermal Store, 2 x 3kw immersions via Immersun + Dunsley Yorkshire WBS
Woodwarm Double sided 6kw WBS
7 acres of old woodland I'm slowly bringing back into order.
mr_magicfingers
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« Reply #13 on: October 21, 2018, 11:45:02 AM »

Now, a thought, I have some blonde shellac in the wood finishing box, I could make some of that up with meths and paint it on, might be a bit neater than spraying.
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Solar PV: 6kw (24 x REC 250w), Sunny Boy 3600TL-21, roof facing 178 at 40 slope.
300l Thermal Store, 2 x 3kw immersions via Immersun + Dunsley Yorkshire WBS
Woodwarm Double sided 6kw WBS
7 acres of old woodland I'm slowly bringing back into order.
Philip R
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« Reply #14 on: October 21, 2018, 05:42:08 PM »

I wound a ferrite cored transformer for my xenon strobe lamp in my youth. The transformer whined quote loudly due to coil movement.
One of my older and very experienced older colleagues suggested that I " borrow" some of my mums nail varnish .
I used the rest of the bottle, worked well, stank for a while.
A few drop of the good ladies clear nail varnish would not go amiss, just don't get caught with it.

Philip R
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