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Electric Shower Problems

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Titus A Duxass View Drop Down
Vanorak
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Titus A Duxass Quote  Post ReplyReply Direct Link To This Post Topic: Electric Shower Problems
    Posted: 19 Nov 19 at 07:53
Greetings Brickies,
 
In my rented flat I have a Stiebel Eltron DHB 18kw water heater that should provide enough hotwater to fill a bath/run a shower.
 
It has three temp settings 35/45/55c and it should flow between 9-12 litres a minute at these temps.
It does not, if you turn the water on too much the heating drops out and you have a cold shower.
 
I've looked at the wiring and it's a 400v 3 phase set up.
 
The neutral is not connected and the terminals (from Bottom to Top) 2-4 have the three phases connected to them. Across terminals 2 and 3 I have 400v. I am pretty sure that the landlord has wired it up incorrectly. How can I check the wiring out?
 
Cheers
Paul
 


Edited by Titus A Duxass - 19 Nov 19 at 07:54
Bollocks to it all!!
51°24′N 12°52′E
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tellytubby View Drop Down
Groupie
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tellytubby Quote  Post ReplyReply Direct Link To This Post Posted: 25 Nov 19 at 13:22
I am not an electrician but my understanding is that with 3 phase star wiring you do not necessarily require a neutral so this setup is probably ok.

For it to run you will need all 3 phases connected.  It will stop running if one of the phases is disconnected - this is why only one terminal is marked as a switched input.

Be aware that the hazard with this setup is that it is live even when apparently switched off!

TT
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Titus A Duxass View Drop Down
Vanorak
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Titus A Duxass Quote  Post ReplyReply Direct Link To This Post Posted: 27 Nov 19 at 11:25
Cheers TT
Bollocks to it all!!
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Mike Noc View Drop Down
Yardie
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike Noc Quote  Post ReplyReply Direct Link To This Post Posted: 02 Dec 19 at 21:59
I'm not an electrician either but if the elements are wired in star then they will require a neutral, so looks like yours are wired in delta where they don't.

From what I can see in the photo it looks to be correctly connected to the incoming supply.

Often the manufacturer includes a wiring diagram on the inside of the casing.

I have used this forum for any electrical questions and they have been very helpful:

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Titus A Duxass View Drop Down
Vanorak
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Titus A Duxass Quote  Post ReplyReply Direct Link To This Post Posted: 03 Dec 19 at 07:22
Cheers Mike.
Bollocks to it all!!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike Noc Quote  Post ReplyReply Direct Link To This Post Posted: 03 Dec 19 at 13:44
No worries mate.

If you want to check the elements then with the incoming power switched off (always check with a meter to be doubly sure) test each pair of the 3 phase wires in turn for resistance; 2 to 3, 3 to 4 and then 4 to 2 with the heater itself switched on.

They should all be equal confirming that all 3 elements are OK. 


Edited by Mike Noc - 2 hours 57 minutes ago at 10:24
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike Noc Quote  Post ReplyReply Direct Link To This Post Posted: 03 Dec 19 at 23:56
Originally posted by Titus A Duxass Titus A Duxass wrote:

Greetings Brickies,
 
The neutral is not connected and the terminals (from Bottom to Top) 2-4 have the three phases connected to them. Across terminals 2 and 3 I have 400v. I am pretty sure that the landlord has wired it up incorrectly. How can I check the wiring out?
 
Cheers
Paul
 



Didn't spot the last bit before. You should have 400v between 2 and 3, 2 and 4 and also 3 and 4. Sounds like you have lost a phase, or as you say the supply end of cable 3 may not be connected correctly. Can you check the supply fuses - one may have blown.
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Vanorak
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Titus A Duxass Quote  Post ReplyReply Direct Link To This Post Posted: 04 Dec 19 at 14:17
Originally posted by Mike Noc Mike Noc wrote:


Didn't spot the last bit before. You should have 400v between 2 and 3, 2 and 4 and also 3 and 4. Sounds like you have lost a phase, or as you say the supply end of cable 3 may not be connected correctly. Can you check the supply fuses - one may have blown.

Thanks for the update.
The fuses are okay, each phase has its own circuit breaker.

I'll check the villages again this weekend and report back.

Titus


Edited by Titus A Duxass - 04 Dec 19 at 14:17
Bollocks to it all!!
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Titus A Duxass View Drop Down
Vanorak
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Titus A Duxass Quote  Post ReplyReply Direct Link To This Post Posted: Yesterday at 13:15
Okay, I've just checked.
I have 400v between 2 and 4.
Between 2 & 3 and 4 & 3 I only have 250v.
Bollocks to it all!!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike Noc Quote  Post ReplyReply Direct Link To This Post Posted: 2 hours 41 minutes ago at 10:40
As we don't have a circuit diagram to go on, if you isolate the circuit at the breaker and then disconnect the 3 wires at the chocblock going into the heater itself (just to take it out of the equation) then turn the power back on and measure across the 3 terminals again.

If you get the same reading on the supply cables as you got before then trace back the cable going into terminal 3 as with those readings it looks like it has been connected to neutral.

Might be worth checking the spare neutral cable 'cos it may be live - wouldn't be the first time I've come across that.

If you get something different post it up and we can go from there.
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Titus A Duxass View Drop Down
Vanorak
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Titus A Duxass Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 53 minutes ago at 11:28
Cheers mate.
I now have enough information to make the landlord do something.
He installed the heater despite not being qualified to do so.
Bollocks to it all!!
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