On Tue, 10 Jul 2007 19:09:30 +0100, The Natural Philosopher
wrote:

Matt wrote:
On Tue, 10 Jul 2007 17:00:05 +0100, 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.

What crap. WB Tech support are wrong.

What model boiler is it?


According to what I found, they are sadly correct.

Except the boiler uses the same basic layout and controller board as
many other WB models that can use the TR2 as an *option*, these other
boilers can use zone valves or mid position valves.

In the R30 HE Plus manual

http://www.worcester-bosch.co.uk/ind...ewFile&id=9917

Page 8 1.8 Electrical wiring diagram

The terminals

L
N
Ns
Ls
LR

are identical to those on many other Worcester boilers.

For instance look up the Greenstar R28 HE, a system boiler that can be
used with a TR2, and can also optionally be fitted with an internal
(24v) diverter valve. When configured like this the R28 HE is,with
the exception of the hot water heat exchanger section, identical in
almost every respect to the R30 HE Plus.

R28 HE manual
http://www.worcester-bosch.co.uk/ind...ewFile&id=9921

This online version has lost some detail available in earlier
revisions of this manual. I've scanned them here.

http://img507.imageshack.us/img507/4153/img380hl1.jpg

http://img248.imageshack.us/img248/9671/img379mw5.jpg


Note that in Fig 31 the Ls-Lr link is shown still in situ - this is
incorrect as it must be removed!

Unplug the TR2 from the main pcb (as it's used for settings and
diagnostics access in the R30 this might not be a long term option)
remove the Ls - Lr link and wire as per these schematics and the
boiler will interface to a whole bunch of standard control plans.


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