Ariston E-Combi with 2 zone valves.

[Dave OCD]

I've managed to confuse myself a bit, I have to connect up the above boiler with 2 zone valves. Now the 'external controls' link is low voltage in the boiler and this is connected to the built in timeswitch for heating, I have 2x 2 port valves [upstairs/downstairs heating zones] and Honeywell room stats which don't have separate volt free contacts.
So I'm thinking of fitting a separate single channel programmer [leaving boiler timer permanently on] with mains out to the two valves[brown motor drive cores] via the stats and using the grey/orange cores in the valves as volt free contacts connected in parallel to the boiler control pair. [Rather than connecting the switches to mains as normal] .
What are your thoughts ?
I think this would be simpler than mucking about with a relay, replys would be very welcome.

 

[Leesparkykent]

What Honeywell thermostats are they?

 

[Dave OCD]

T6360 I think Lee. [Old school stats]

 

[buzzlightyear]

http://www.honeywelluk.com/documents/All/pdf/Wiring Guide Issue 16.pdf may be this will help you dave ocd.is it a c plan!

 

[Leesparkykent]

T6360 I think Lee. [Old school stats]

yeah not going to work with the internal programmer. Options are change the thermostats or use an external programmer and take the volt free switching through the grey and oranges of the valves as you say.

 

[Dave OCD]

Thanks for confirming that Lee, can't really change the 'stats as only got 3c and earth to each one. I can't really see how a relay would work with this setup anyway.

 

[Leesparkykent]

Thanks for confirming that Lee, can't really change the 'stats as only got 3c and earth to each one. I can't really see how a relay would work with this setup anyway.

You can get 2 wire volt free thermostats, they are powered with a battery. https://www.amazon.co.uk/Dial-Setting-Wire-Volt-Thermostat/dp/B0077BLIA6 Like this. This is what I would probably do instead of the external programmer.

 

[Dave OCD]

Thanks Lee , how would I then get the mains to the motors on the valves though ? It's possible that I'm being dim here.

 

[Dave OCD]

http://www.honeywelluk.com/documents/All/pdf/Wiring Guide Issue 16.pdf may be this will help you dave ocd.is it a c plan!

Thanks for your input Buzz but no it's a combi with 2 heating zones.

 

[Leesparkykent]

Thanks Lee , how would I then get the mains to the motors on the valves though ? It's possible that I'm being dim here.

No Dave it's me being dim...external programmer it is

 

[Dave OCD]

Thanks very much Lee, it's good to get a 2nd opinion, thought it might be you replying on this thread.

 

[Dave OCD]

Actually thinking a bit more I could even use a 2 channel programmer for separate up/down times- would probably just cause more confusion for the end user though.