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#115691 12/04/03 04:28 PM
Joined: Oct 2000
Posts: 3,672
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Quote
As the pump of our 4.5kW water heater started to make unusual noises, i removed the covers and the steerings cover, to find the heating element was connected to the contactor with totally rusty ferrules, one was just soldered and screwed in. so i removed the corrosed parts, cut a bit of the cable as there was enough spare, removed the insulation, to find all the copper strands were black. not overheated, corrosed. I decided to change the whole cable, traced it to a cover on the heating element, removed the cover to see this:
[Linked Image]
Quote
thanks pump for failing [Linked Image] otherwise i'd never found this time bomb. imagine there were 4500W running on almost daily...

greetings
:andy:

#115692 12/05/03 06:33 AM
Joined: Aug 2001
Posts: 7,520
P
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Not good. Is this a 3-ph 400V heater?

#115693 12/05/03 08:01 AM
Joined: Sep 2002
Posts: 1,498
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C
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I'm not sure what it was originally, but it sure isn't whatever it was anymore! [Linked Image]

#115694 12/05/03 09:37 AM
Joined: Oct 2000
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I'm not sure what it was originally, but it sure isn't whatever it was anymore!
Yes .... But can you say that 3 times fast?

[Linked Image]
Bill


Bill
#115695 12/05/03 09:58 AM
Joined: Oct 2003
Posts: 289
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this is a three phase 400V-delta heater.
i dont want to know if the heating element or the terminals were hotter when running...

i forgot to mention the age: 25 years. i'd thaught the corrosion protection would be a *bit* better, humm....

the wire under the green-yellow one is blue at the other end of the cable [Linked Image]

i couldnt find out if the connections ever were made fine (ferrules or soldered wire), as i couldn't get the terminals open yet... the water is warmed up by our central oil heating in the winter, the electric heating is just needed in summer, but i think i'll just leave it that way and shut the electric part down.

you can view a picture in 1280x960 at http://320036920636.bei.t-online.de/ECN/RIMG0109.JPG (~200kB)


[This message has been edited by :andy: (edited 12-05-2003).]

#115696 12/05/03 10:52 AM
Joined: Sep 2002
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Bill, I tried and the third time I read it "I'm sure not what I was..." [Linked Image]

Andy, I didn't think connections could go that bad. Wonder how many volts were left for the heater once the connections had taken their share...

BTW. Is this a hot water cylinder? 4.5kW seems to little for a instantaneous water heater.

[This message has been edited by C-H (edited 12-05-2003).]

#115697 12/05/03 12:09 PM
Joined: Oct 2003
Posts: 289
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its a cylinder, about 150-200 liters i guess


i still couldnt figure about the connection. what do you think is under the screw? soldered, ferrule or bare wires?

[Linked Image from 320036920636.bei.t-online.de]


[This message has been edited by :andy: (edited 12-08-2003).]

#115698 12/06/03 05:56 PM
Joined: Sep 2003
Posts: 123
M
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Maybe a split bolt of some kind??
Orjust darn good luck for Any

#115699 12/07/03 12:12 AM
Joined: Aug 2002
Posts: 1,691
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I see what looks to be the slot in the head of a screw.

Look at the vertical channel of sorts running north-east/southwest.

It's definitely a screw - probably with a little pressure plate to clamp against the wire. You don't want to tin wires that go under a screw. The solder will "creep" and the connection will eventually work itself loose from heat cycling.

#115700 12/07/03 07:42 AM
Joined: Oct 2003
Posts: 289
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i knew its a screw, i just ask myself how the wire was made up before screwed in.

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