Wiring a relay to protect a programmer help.

[CountryFan]

Not sure if this helps? https://www.amazon.co.uk/Finder-133182304300PAS-Built-Switches-250-VAC1/dp/B00RBYS9BA

 

[mattylad]

Not sure if this helps? https://www.amazon.co.uk/Finder-133182304300PAS-Built-Switches-250-VAC1/dp/B00RBYS9BA

YEs that one is good - I could not read the details from the picture but you found it

 

[Lee Edwards]

Hi. Thanks for the advice and link.

There is no spare place in the receiver to install this. Unless it is really small but I cannot find the dimensions of it.

There is nothing about it specs I can find online. It just calls it the receiver.

Sorry I cannot find any specs on the v3+ receiver.

 

[CountryFan]

I can see from searching that this is a common issue with Tado receivers - only about a 6A contact so probably not enough.

A lot of programmers are only 3A, so why would a relay be needed? Heating systems are fuse rated with 3A too so I’m slightly confused.

It is the Tado doing the switching

It’s a Y plan, so should be Tado - MV - Pump and boiler switch live, so still confused as to why it would be the pump drawing too much load

 

[Lee Edwards]

Not sure if this helps? https://www.amazon.co.uk/Finder-133182304300PAS-Built-Switches-250-VAC1/dp/B00RBYS9BA

Well done, you found the one in the picture. The problem is I cannot install it any where near the receiver.

 

[mattylad]

A lot of programmers are only 3A, so why would a relay be needed? Heating systems are fuse rated with 3A too so I’m slightly confused.

It’s a Y plan, so should be Tado - MV - Pump and boiler switch live, so still confused as to why it would be the pump drawing too much load

Read what hte TADO CS said, a pump can give a large load/high inrush current on switch on.
It's a common problem according to Google.

I build electrical control panels for much much larger pump, we sometimes have to increase/swap the MCB for a bigger one/different type than what was expected.

 

[mattylad]

Well done, you found the one in the picture. The problem is I cannot install it any where near the receiver.

Where is the pump? You can install it next to the pump - in fact it is probable better there.

 

[endecotp]

perhaps using a solid state relay instead.

I would not recommend that.

 

[Mister Banks]

…

 

[Lee Edwards]

Where is the pump? You can install it next to the pump - in fact it is probable better there.

The pump is in the airing cupboard with the wiring centre.

If I could do this, that would make life a lot easier.

 

[endecotp]

The problem is I cannot install it any where near the receiver.

You can install it anywhere convenient, where you can intercept the necessary wires. I.e. the wires to the TADO receiver and the wires to the pump (and a mains supply).

 

[endecotp]

If the TADO contacts are rated 6A and they fail so frequently, I’d use a 30A relay.

You should also consider whether the pump is on its way out. Maybe this will save the TADO, but then the pump will fail completely in 6 months time, and the replacement pump will not need it.

 

[mattylad]

^^^^ This.

 

[mattylad]

You can find a small enclosure to fit the relay in that will easily be able to be fitted in the airing cupboard.

 

[CountryFan]

Read what hte TADO CS said, a pump can give a large load/high inrush current on switch on.
It's a common problem according to Google.

I did read it. What I also saw was a com to no on heating, not on dhw.

I build electrical control panels for much much larger pump, we sometimes have to increase/swap the MCB for a bigger one/different type than what was expected.

Probably understand it better than me then. I’m only a gas engineer with limited heating wiring/electrical knowledge