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jasonjkd

Hi all Can I change a thermostat from a sunvic tlx2251 to a TLX7501.

Thanks
 
It is a glow worm 38cxi combi, But my current thermostat has only got two wires 1 and 3 but the new one has got aspace for 3.
 
you want 3 and 2.

3 is common (live call from boiler)
2 is switched live to tell boiler to come on
1 is off not used.

double check the instructions but thats it if i remember.

it is also low voltage.
 
Last edited by a moderator:
This is what my old one looks like. I have attached 2 photos if that helps.
 

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The tx7501 is spdt which means that it allows powering off as well as powering on. Most applications require a call for heat and therefore the advice given above is correct - leave terminal 1 unused.
 
If you only have two wires then it doesn't really matter except to purists.
 
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