Immersion Thermostat wire burns out

marconi · May 28, 2022

Good evening from London. Thank you for the information. That element has 3 separate elements wired in parallel. Could you give me manufacturer and part number for it please so I can learn more about it?

brixtonia · May 28, 2022

marconi said:
Good evening from London. Thank you for the information. That element has 3 separate elements wired in parallel. Could you give me manufacturer and part number for it please so I can learn more about it?

[ElectriciansForums.net] Immersion Thermostat wire burns out

Made in Italy I believe.

brixtonia · May 28, 2022

marconi said:
With reference to the 20A control stat I discovered this while searching for its technical specification:

Cotherm
TSD01106
Thermostat
Cotherm TSD01106 20A Control Thermostat
A Cotherm brand adjustable control thermostat with a range of approximately 5°C - 85°C.
The TSD01106 is a rod thermostat with single pole break-on-rise action rated at 20A 240v. The stem (rod) is 265mm long and 7.5mm in diameter making suitable for use in all standard 280mm x 8mm (11" x 5/16") thermostat pockets. It is ideal for use in commercial products for direct control of single phase loads up to 3kW or to operate a contactor for higher loads or three phase applications.
Note: This device does not include a safety cut-out and is only designed to control the water temperature.
This thermostat is NOT SUITABLE for DOMESTIC without there bring an additional a safety cut-out as required by law.
Condition: New and unused in original manufacturer's packaging.
Delivery
Orders received before 2pm Monday to Friday will be despatched the same day. Orders received after 2pm Friday, Saturday or Sunday will be dispatched the following Monday. Orders received after 2pm will be treated as having arrived the following day.

All goods are dispatched, professionally packed, on a signed for service. In most cases our carrier can leave the goods in a safe place, or with a neighbour for no extra charge. Should you require this service please detail it in the notes when placing your order together with a contact telephone number.

If you do not receive the goods within three working days (Monday to Friday) of placing your order we would ask that you contact us. We can then investigate the problem and authorise a replacement where necessary.

If you wish to purchase more than one listed item, we can usually ship these together for a reduced overall carriage charge. In this instance please contact us before paying so that we can advise you of the combined carriage charge.

Hours

Can you provide a link to this info? I'd like to share it with the supplier.

brixtonia · May 28, 2022

Incidentally, my supply is single phase so I guess that must have been the problem. Why would single vs three phase make a difference to the amp rating of the stat?

brianmoooore · May 28, 2022

If this was fed by a three phase supply, you wouldn't be able to control it directly with a single 'stat, which possibly explains why there appears to be two 'stat pockets.
You could also fit two stats with your single phase supply, controlling two elements with one, and the third with the other. This would bring the 'stat current well within the limits of a 16A version.

marconi · May 29, 2022

brixtonia said:
Can you provide a link to this info? I'd like to share it with the supplier.

I will see if I still have it.

marconi · May 29, 2022

Cotherm TSD01106 Thermostat - 280mm Stem, 20AMP | eBay - https://www.ebay.co.uk/itm/183661179944

It was this company advertising on ebay to sell the control stat that included the advice I pointed out in red. Perhaps email or call them for further information. If you learn more from this company on why the advice was given would you mind sending another post so others can know too please?

Regards
Marconi

WH (Water Heating) Co Ltd
Trevor Guy
2 Horsecroft Place
Harlow
Essex
CM19 5BT

Phone: 01279641722
Email: [email protected]

johntheo · Jun 3, 2022

Total resistance was measured at 14 ohms so 3 elements in parallel = approx 42 ohms/element but total current through stats is still the same, "4kw" immersion is 3.779kw @ 230V = 16.43A. or 4.114kw @ 240V = 17.14A so new stat is just doing what it's supposed to do and not burning out?. (single phase supply).

brixtonia · Jun 8, 2022

Wrote to supplier who replied:

The thermostats are designed for single phase elements, or three phase elements wired in single phase configuration up to 4kw.
To use with elements wired in three phase configuration, the thermostat needs to switch a contactor.
So, the thermostat you received with your 4kw element is suitable for single phase use.
The 4kw element is rated at 17.5a and the thermostat is rated at 20a.
We have never had a thermostat burn out. Please check your wiring as the problem is not with the thermostat.

However, it seems to contradict the instruction leaflet (not received with the immersion - emailed after) which seems to say that higher loadings than 3kW need a contactor?

Avo Mk8 · Jun 8, 2022

I'm suspicious of the binary pricing of the Cotherm thermostat in the marketplace - around £12 general outlets, around £30 from reputable suppliers, one of whom publishes this footnote with the details of the stat:

SANTON S8203 THERMOSTAT TSD01106 11" 5-80'C COTHERM
This part is compatible for use with:

Santon DF range R25/R45/R70/R115

PLEASE BE AWARE: This a genuine Heatrae Sadia manufactured part, unlike many of our competitors.

The genuine part seems to have a 'properly approved' 20A resistive rating, so I would have thought capable of handling the 4kW load. Perhaps your leaflet covers the, dare I say, " Chinese Export" version

Immersion Thermostat wire burns out

marconi

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brixtonia

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brixtonia

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brixtonia

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brianmoooore

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marconi

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marconi

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johntheo

brixtonia

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Avo Mk8

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