The Brick-yard Homepage Brickwerks
Forum Home Forum Home > The Brickyard > The Brickie's Arms
  New Posts New Posts RSS Feed - Electric Shower Problems
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Electric Shower Problems
 Post Reply Post Reply
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
Titus A Duxass View Drop Down
Vanorak
Vanorak


Joined: 12 Feb 08
Location: Lossatal, Germ.
Status: Offline
Points: 2143 		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
Back to Top
tellytubby View Drop Down
Groupie
Groupie


Joined: 29 Mar 16
Location: Glasgow
Status: Online
Points: 111 		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
Back to Top
Titus A Duxass View Drop Down
Vanorak
Vanorak


Joined: 12 Feb 08
Location: Lossatal, Germ.
Status: Offline
Points: 2143 		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!!
51°24′N 12°52′E
Back to Top
Mike Noc View Drop Down
Yardie
Yardie
Avatar

Joined: 15 Aug 11
Location: Hampshire
Status: Offline
Points: 381 		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:
'The Big Slow' LT35 1989 normally aspirated Diesel Horsebox - Gone but not forgotten.
Back to Top
Titus A Duxass View Drop Down
Vanorak
Vanorak


Joined: 12 Feb 08
Location: Lossatal, Germ.
Status: Offline
Points: 2143 		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!!
51°24′N 12°52′E
Back to Top
Mike Noc View Drop Down
Yardie
Yardie
Avatar

Joined: 15 Aug 11
Location: Hampshire
Status: Offline
Points: 381 		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; 1 to 2, 2 to 3 and then 3 to 1 with the heater itself switched on.

They should all be equal confirming that all 3 elements are OK. 
'The Big Slow' LT35 1989 normally aspirated Diesel Horsebox - Gone but not forgotten.
Back to Top
Mike Noc View Drop Down
Yardie
Yardie
Avatar

Joined: 15 Aug 11
Location: Hampshire
Status: Offline
Points: 381 		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.
'The Big Slow' LT35 1989 normally aspirated Diesel Horsebox - Gone but not forgotten.
Back to Top
Titus A Duxass View Drop Down
Vanorak
Vanorak


Joined: 12 Feb 08
Location: Lossatal, Germ.
Status: Offline
Points: 2143 		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!!
51°24′N 12°52′E
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.01
Copyright ©2001-2018 Web Wiz Ltd.

The WebThis site