Ireland Thermostat wiring

[pauldalya1]

Hi, I want to install a room thermostat (Salus ERT20RF) where there was none before. I would like to
leave an existing APT mechanical timer in place. My question is can I wire the switched live contacts (from both timer and thermostat) in series to turn on and off boiler ?. Both units have only 4 terminals (live, neutral, switched live and earth). Many thanks,
Paul.

 

[fairlight]

You can wire both switch contacts in series assuming the only control currently on the system is the timer

 

[pauldalya1]

Many thanks fairlight. The only existing control is the mechanical timer.