Boiler Room Stat wiring

[rolyatescort]

Hi folks, it's a while since I've needed assistance on here and I'm hoping you can steer me right as you've never done me wrong in the past.

I have a Grants Multipass Oil boiler with onboard digital timer and no room stat.
I have invested in the Netatmo wireless room stat, timer intelligent app system.
I am at the point of removing the original timer and swapping to the Netatmo transmitter but I have a query.
The Netatmo has the usual four wires. The original timer has 5, two power, one central heating, HW on and HW off.

How do I wire it please?

 

[James1991]

Is it a combi boiler?
If it's a system boiler then you'll need to leave the internal programmer connected and wire the new stat through the wiring centre at the 3 port zone valve. If that is the type of system you have?

 

[rolyatescort]

no, it's not a combi

the new stat is supposed to replace the timer?

 

[Terrywookfit]

If you remove the timer then you will have no control over the hot water timing.

 

[rolyatescort]

I've just come home having been out for a meeting and realise that I was overthinking it in entirely the wrong direction!

Thanks for the help guys and I will be back on if I fail at the next attempt

 

[D_Hailsham]

The Netatmo only controls the Central Heating. You will have to retain the existing programmer to control the Hot Water.