Drayton wiser install - Help please

[milfordkong]

Trying to install Drayton Wiser 1 zone with my Worcester Greenstar 38cdi boiler - I have 6 radiator thermostats and 1 room thermostat - The radiator thermostats are behaving as required but the room thermostat that should control any other radiators in the house doesn't seem to be doing that - If there's any demand for heat from any of the radiator thermostats then any radiators without a radiator thermostat are on - The room thermostat seems to have no impact on them.

I'm fairly sure this is a wiring issue, as it wasn't a simple swap from the previous Honeywell controller. I have tried what seems like every possible combination of wiring to the Wiser wallplate and the current situation seems to be the best I can get.

Any ideas what could be going on here? Thanks in advance.

[clockworks]

Sounds like it's working as expected, assuming Wiser works the same way as Evohome?

As soon as one radiator "smart" valve calls for heat, any radiator that doesn't have a "smart" valve fitted will also get hot - there's nothing to keep it turned off.

That's how my Evohome setup works - any smart stat (radiator or room) can fire up the boiler. Any open radiator will then get hot. Only those fitted with smart valves (set below the current temp) will stay off.

If you want to control all the radiators, they will all need to have "smart" valves, or old-school TRVs that are set below the current room temperature.

[Mr Pointy]

What are you exprcting to happen? If any of the TRVs call for heat then the boiler will fire, the pump will run & the non-TRV rads will get hot, unless you have zoned them off with a zone valve to isolate them.

[mrpbailey]

As already stated, what it’s doing is exactly what should be expected to happen!
How is a non smart thermostat expected to offer smart controls?
The room thermostat just tells the boiler when to fire, any TRV’s which are not turned off will cause that rad to heat up

Edited by mrpbailey on Sunday 29th September 18:55

[milfordkong]

Ok, bell end of the year award goes to me - Thanks guys, that actually makes complete sense. Need some adaptors for a few of the rads (or new valves) but we'll get there.