Yes, the clock in that picture doesn't actually work, never has. But in any case, the GSM switch is just wired across the big red on/off switch on the left.
The GSM switch I used is this one. I used the 240V mains voltage version. However the manual for the 12V one shows wiring for a boiler. I didn't particularly understand it but in my case I only wanted control over the on/off switch which was comparatively easy to wire up.
My system (underfloor heating) is designed to be on all the time ... the timer just switches it to a higher/lower setting. So there was no need to bypass a timer. It looks from the wiring in the manual that you normally would have to. I imagine an electrician would know how to do it, but I couldn't get one so was on my own.
The GSM switch I used is this one. I used the 240V mains voltage version. However the manual for the 12V one shows wiring for a boiler. I didn't particularly understand it but in my case I only wanted control over the on/off switch which was comparatively easy to wire up.
My system (underfloor heating) is designed to be on all the time ... the timer just switches it to a higher/lower setting. So there was no need to bypass a timer. It looks from the wiring in the manual that you normally would have to. I imagine an electrician would know how to do it, but I couldn't get one so was on my own.
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