High-Pitched Sound from Fuse Box when 3.5 kW Air Conditioner is On in a 12.5 kW Apartment

Question

Hello. As this is my first time here, I'd like to say hello, so hello. I have a little problem: Well, I bought an apartment, there are 3 phases in the apartment - connection power 12.5 kW. I don't live there yet - I'm in the renovation phase. Last week I had a 3.5 kW air conditioner...

Łukasz-O · Accepted Answer

The B16 circuit breaker with a load of 3.5kW works almost at the edge of endurance, writing in a colloquial language. You can try to replace it with another one, from a different company, e.g. EATON.

Switchgear made cheaply, with incorrect denomination of lighting protection. Scandalously small number of circuits for the current times. Such "expanded" installations were made in the early 90s.
Somehow I do not see a separate circuit for the air conditioner or it is common with something or the cost of something.
As far as I can see:
1. 400V plate,
2. Kitchen outlets?
3. Bathroom outlets?
4. Sockets rooms?
5. Lighting and bell?

Where are the circuits dedicated to loads above 2kW, such as a washing machine, dishwasher, oven (if separate) and air conditioner?
There is no main switch in the switchgear, and the four-pole RCD looks as if it is going somewhere. General disorder, lack of comb rails, phase on the blue wire from the bell. N-controlled bell.
No room for possible expansion.
Who did the "electricity" for you?

radex324 · Answer

Call an electrician, he'll sort it out.

Łukasz-O · Answer

Take a picture of the switchgear. Maybe it's the contactor.

maniek998straz · Answer

Unfortunately, but at the moment I'm already at home, I can't take a picture, but tomorrow, yes, can you use this electricity or rather wait for an electrician to check it???

sermarek · Answer

Probably the squeak is caused by the operation of the inverter in the air conditioner.

Łukasz-O · Answer

We are talking about the switchgear in the apartment.

sermarek · Answer

The question implies yes. I have already encountered the fact that due to poor filtration of the inverter power supply, the operation of the inverter is audible in the switchgear. I suspect non-final filtration on the power supply of the inverter circuits - the manufacturer's savings. If the author of the subject had listened to the air conditioner, he probably would have heard the same squeak. Perhaps it is drowned out by the operation of the compressor.

opornik7 · Answer

In my opinion, it squeaks or rather hiss the circuit protection. And what, how to beg is to beg

Łukasz-O · Answer

If Chinese modules were used, it's very likely. The question is whether hissing, squeaking, buzzing always after switching on the switch, or only after switching on the switch and the air conditioning is working.

sermarek · Answer

It's time for the author of the topic to check it out.

opornik7 · Answer

Luke, let's give him a few days until it gets warm. He will probably write that something stinks from the switchgear or that something has burnt. Manik, take a photo and post it.

andrzej lukaszewicz · Answer

For example, the LC equipment beeps when the induction hob is turned on.

retrofood · Answer

I open the topic at the request of the author. Please correct the spelling of all your previous posts.

maniek998straz · Answer

I finally managed to write something, I just didn't know that there were requirements such as correct spelling, but to the point, the fuses squealed so squeaked, in response to earlier questions, squeaking, or what my wife called "sizzling '' starts about 2 minutes after turning on the air conditioner.

And here is a photo of this invention, I circled the place from which this noise is probably coming from, the ear method :)

opornik7 · Answer

Didn't I say in post #8?

Łukasz-O · Answer

Well done you! :D For 12.5kW of power allocation and a new apartment, the switchgear and installation are very good.

maniek998straz · Answer

So what is it about??? :) If this installation is bad, what can be done to prevent it from being? Replace all these things??? And can you use this current or wait until these gadgets are replaced??

opornik7 · Answer

I did, sir. Alone. Unless the developer.

maniek998straz · Answer

The developer did just that

So that it has at least a little arms and legs, it's a decent electrician and everything needs to be changed???

And instead of these B16, you can put on some stronger ones??? The air conditioner is connected to the socket simply ....

And what will happen if you turn on the induction 7.2 kw??? Will it work??? Of course, 3 phase.

r-maniac · Answer

This is how 90% of electrical installations in new apartments sold by developers look like nowadays.

mawerix123 · Answer

I don't really know what they could be used for ;) By no means!!! Of course, two-phase

maniek998straz · Answer

So if I have the air conditioning on, and I turn on, for example, something additional on the same circuit, let's say 5kW, 3.5 from the air conditioner and plus something else, then what? Will these corks shoot??? Even if I replace it with what a colleague wrote Eaton???

And what about this induction, will it work???

And should I replace everything from this box with this Eaton???

haneb · Answer

The overcurrent circuit breaker consists of an overload and a short-circuit element. The shutdown time depends on the current. The B16 should turn off in 0.4 seconds at 3-5 times the rated current, i.e. from 48A to 80A. If you connected 5.5kW, the overload element would start to heat up and should turn off in 10 to 1000 seconds. At 5kW it would be around 100 to 5000 seconds. Of course, if the thermostat was warmed up, it would be shorter. See time-current characteristics. P.S. My Legrand buzzes when the oven or dryer is turned on

maniek998straz · Answer

Or maybe it would just be best to connect this air conditioner to the lighting circuit, not the sockets??? Then it will be possible to connect all devices such as a TV vacuum cleaner, iron, without thinking that the fuse will not work, and there are only LEDs on the circuit with lighting, so it will be little loaded???

Such layman's thoughts

mawerix123 · Answer

Following this line of thinking, you will screw up the installation in the apartment .... probably 1.5mm2 B16 protection and about 3.7kW on the perimeter .... The only rational solution is to lead a separate circuit to the air conditioner, protected in accordance with the manufacturer's recommendations.

maniek998straz · Answer

These are the parameters of this air conditioner:

Technical data
PRESTIGE product series
Model Number (Indoor/Outdoor) AR12HSSFAWKNEU/X
Capacity, cooling, nominal (kW) 3.5
Capacity, cooling, min-max (kW) 0.97~4.0
Capacity, heating, nominal (kW) 4.0
Capacity, heating, min-max (kW) 0.85~6.6
Dehumidification (l/h) 1.2
Fan capacity, maximum (m3/h) 720
Sound pressure level, indoor unit, high/low (dB) 39/16
Sound pressure level, outdoor unit, maximum (dB) 46
Power supply (V, Hz, phases) 220~240/50/1
Electrical power, cooling (W) 940
Electric power, heating (W) 1050
Current consumption, cooling (A) 4.4
Current consumption, heating (A) 4.9

Can a 3/3 wire and B20 protection be used when laying a new circuit???

mawerix123 · Answer

As it turned out, the device consumes 1kW and not 3.5kW as you declared earlier. This is the maximum power that the device consumes.

maniek998straz · Answer

I'm not an expert, I just bought something like this I write 3.5kW, I thought, just like everyone said that 3.5kW is 3.5kW :/

Łukasz-O · Answer

A separate circuit with separate protection should be connected to the air conditioner. The protection of the lighting circuits must also be replaced (use B10). It is worth bringing at least one additional circuit for the dishwasher to the kitchen. I do not want to comment on the LVS modular equipment, because I have never dealt with it. In your place, while you still have the opportunity, I would throw out the current switchgear and put in at least 2x18. Then the main switch, voltage presence indicators will fit and there will be a lot of space for connecting new circuits from the air conditioning and dishwasher, and maybe also from the washing machine (if it will be in the kitchen) and the oven (if it is separate). think it over. In the case of this extended box, it will reduce the assembly time from 30 to 10 minutes ;) You're exaggerating the 90% a bit. Yes, some people fly at cost, but you can't generalize like that. A reliable developer is recognized not only by the high standard of finish, such as marble and gres tiles on the staircases, but also by the switchgear in the apartment. Show me the switchboards and I'll tell you how much a developer is worth. Whenever I am at a new facility, I always pay attention to the box in the apartment and immediately have an idea of \u200b\u200bthe developer. Unfortunately, people receiving apartments do not know what to look for. For them, visual effects are the most important, the whole general envelope, they can't see crap covered with plaster. Here the developers did not save on circuits: But there are also these: P.S. At the time of writing this message, I have not seen posts with the actual electric power drawn by the author's air conditioner.