Dave Plowman (News) wrote:
In article ,
Mike Barnard wrote:
My Worcester Bosch boiler cannot be activated by external zone
controls. So says the techie's at WB themselves. I've spent hours
and hours and a couple of hundred pounds doing the zone thing. I tried
to sort the controls today and couldn't figure out how to connect them
to the boiler. So I called WB tech support and my boiler (which is
only 2 years old FFS!" cannot take it. No way. "Can't I bodge a
control in somewhere?" Nope. The text display controls it all. There
is no single 'lightitupnow' connection in there.

If it can be controlled by an external thermostat it can be controlled by
zone valves. That's not to say a ready made interface is available, though.


Ok..is it this one ?

http://www.worcester-bosch.ie/file.home/13231

That would appear to have a connection into the text unit thingie for
'TR2' which looks promising. See section 1.8

Yup. TR2 is the 'connection of an external room stat or frost stat' See
section 4.3

So that connection can be used to completely override the text display
thingie. That's what a frost stat does..

My guess is that an external clock and stat system could be used to
completely control the thing with e 'text display being set to 'nothing,
ever'


Or use the text display thing for one zone, then set up your motorized
zone valves, and external timers and stats and connect the MV switches
in parallel between the switched live and switched return on the TR2
connector block.

So that any zone that 'calls' for heat will override the text display.

See? simple innit?