In an earlier contribution to this discussion,
John wrote:

I should have asked the installer but he's now away on holiday (

Anyway, just had an Alpha boiler installed (CD32C) and wireless room
stat/programmer/timer thingy. The boiler itself has a thermostat
numbered 0-9, there's the room stat, and then all the rads except one
have thermostatic valves. Which thermostat takes priority and what
should the one on the boiler be set at?

TIA,

Puzzled of Cleethorpes

None of them in absolute terms - because they are all doing different jobs.

The boiler stat is controlling the temperature of the water leaving the
boiler - typically about 80 degC and, whenever the heating is running, turns
the burner on and off to maintain that.

The room stat attempts to keep the house at the correct temperature
(typically 21 degC) by turning the whole system (boiler plus pump) on and
off as needed.

The TRVs on the radiators attempt to keep each room at the right temperature
by turning individual radiators on and off. These only have any effect when
the system is running so, to that extent, the room stat has priority over
them. Systems should be designed so that the room containing the room stat
(and no TRV on its radiator) heats up slightly more slowly than the other
rooms so as to give the TRVs time to act before the whole lot starts cycling
on the room stat.
--
Cheers,
Roger
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