Wiring in a programmer/roomstat to a combi boiler
 

Hi
I am on the home straight to installing a complete ch system in my house.
The combi is a worcester bosch 28i and I have a Horstmann centaurstat 1 to
site in the lounge. Problem is although I found the ch a doddle to install
wiring is not my strong point. The Centaurstat has four connections 1) Live
(line) 2) Load (heat) 3)load (cool) and 40 Neutral (parking). The combi has
two sets of three connectors one for the room stat and one for the
programmer. The 3 for the roomstat are 1) RN (neutral) 2) RI (switched live)
3) RL (live) and the 3 for the programmer are 1) CN (neutral) 2) CI
(switched live) 3)CL (live). So it appears that i will have 6 wires coming
from the combi to wire to 4 terminals on the centaurstat so it seems that
some trminals on the cetaurstat are shared. If anyone knows how to wire this
I would be very grateful for the info.
Regards
Nick

"Nick Lane" wrote in message
...
Hi
I am on the home straight to installing a complete ch system in my house.
The combi is a worcester bosch 28i and I have a Horstmann centaurstat 1 to
site in the lounge. Problem is although I found the ch a doddle to install
wiring is not my strong point. The Centaurstat has four connections 1)
Live (line) 2) Load (heat) 3)load (cool) and 40 Neutral (parking). The
combi has two sets of three connectors one for the room stat and one for
the programmer. The 3 for the roomstat are 1) RN (neutral) 2) RI (switched
live) 3) RL (live) and the 3 for the programmer are 1) CN (neutral) 2) CI
(switched live) 3)CL (live). So it appears that i will have 6 wires coming
from the combi to wire to 4 terminals on the centaurstat so it seems that
some trminals on the cetaurstat are shared. If anyone knows how to wire
this I would be very grateful for the info.
Regards
Nick


Ignore the 3 for the programmer, and ignore no.3 connection on the stat, and
then neutral to neutral, live to live and Load(heat) to RI (switched live)

Job done.

Dave Jones

Ignore the 3 for the programmer, and ignore no.3 connection on the stat, and
then neutral to neutral, live to live and Load(heat) to RI (switched live)

Is this assuming that the Stat is wired in series with the programmer
though? Otherwise there is no time control to this system?

Phil

In an earlier contribution to this discussion,
Big Phil wrote:

Ignore the 3 for the programmer, and ignore no.3 connection on the
stat, and then neutral to neutral, live to live and Load(heat) to RI
(switched live)

Is this assuming that the Stat is wired in series with the programmer
though? Otherwise there is no time control to this system?

Phil


Aren't we talking about a programmable stat, which does *both* timing *and*
temperature control in a single device?
--
Cheers,
Set Square
______
Please reply to newsgroup. Reply address is invalid.

On Wed, 29 Sep 2004 13:35:38 +0100, Set Square wrote:

Aren't we talking about a programmable stat, which does *both*
timing *and* temperature control in a single device?

Even if we are still having a conventional controller in series is
handy as most programmable stats are not easy to manually force off by
a single button push or three, where as programmers are. Also if you
have noisey pipework it can be a bit annoying having the heating come
on at 0300 just beacause the house has sunk below 15C. Heat it when
you need it not just because some dum stat says so.

--
Cheers
Dave. pam is missing e-mail

In message om, Dave
Liquorice writes
On Wed, 29 Sep 2004 13:35:38 +0100, Set Square wrote:

Aren't we talking about a programmable stat, which does *both*
timing *and* temperature control in a single device?

Even if we are still having a conventional controller in series is
handy as most programmable stats are not easy to manually force off by
a single button push or three, where as programmers are.

In 7 years of having a programmable stat on our system I can't say I've
ever noticed that desire. If I want to turn the system off for some
reason then I use the boiler controls. (as it happens there is timer as
well in the circuit as the boiler has one built in, but I never touch
it)

Also if you
have noisey pipework it can be a bit annoying having the heating come
on at 0300 just beacause the house has sunk below 15C. Heat it when
you need it not just because some dum stat says so.

The Sat would only be saying so because that is how you had programmed
it

If you don't want the heating to come on in that situation you would set
a lower temp for that time period
--
Chris French, Leeds

Many thanks for your help this looks to have solved my probs
Cheers
Nick

"chris French" wrote in message
...
In message om, Dave
Liquorice writes
On Wed, 29 Sep 2004 13:35:38 +0100, Set Square wrote:

Aren't we talking about a programmable stat, which does *both*
timing *and* temperature control in a single device?

Even if we are still having a conventional controller in series is
handy as most programmable stats are not easy to manually force off by
a single button push or three, where as programmers are.

In 7 years of having a programmable stat on our system I can't say I've
ever noticed that desire. If I want to turn the system off for some reason
then I use the boiler controls. (as it happens there is timer as well in
the circuit as the boiler has one built in, but I never touch it)

Also if you
have noisey pipework it can be a bit annoying having the heating come
on at 0300 just beacause the house has sunk below 15C. Heat it when
you need it not just because some dum stat says so.

The Sat would only be saying so because that is how you had programmed it

If you don't want the heating to come on in that situation you would set a
lower temp for that time period
--
Chris French, Leeds

On Thu, 30 Sep 2004 01:12:53 +0100, chris French wrote:

In 7 years of having a programmable stat on our system I can't say
I've ever noticed that desire. If I want to turn the system off for
some reason then I use the boiler controls.

Does that disable the HW as well though? I could turn the boiler off
but then there would be no HW...

If you don't want the heating to come on in that situation you would
set a lower temp for that time period.

I guess so. But bear in mind that this place has drafty windows and
little wall insulation. When the wind gets up it cools very rapidly
and as I said "Heat it when you need it" and I tend not to sleep in
the living room where the stat is. Bedroom down to 12C or lower is
dealt with by a good duvet...

--
Cheers
Dave. pam is missing e-mail

In message om, Dave
Liquorice writes
On Thu, 30 Sep 2004 01:12:53 +0100, chris French wrote:

In 7 years of having a programmable stat on our system I can't say
I've ever noticed that desire. If I want to turn the system off for
some reason then I use the boiler controls.

Does that disable the HW as well though? I could turn the boiler off
but then there would be no HW...

The Op was talking about a combi, I have combi also, I was really in
my original post talking with regard to a combi. so yes, if I just want
to turn off the heating and leave the HW I can.


If you don't want the heating to come on in that situation you would
set a lower temp for that time period.

I guess so. But bear in mind that this place has drafty windows and
little wall insulation. When the wind gets up it cools very rapidly
and as I said "Heat it when you need it" and I tend not to sleep in
the living room where the stat is. Bedroom down to 12C or lower is
dealt with by a good duvet...

Depends on the interpretation of 'when you need it'.

My stat has 3 temp levels, I set the lower one at somewhere like 8C I
think (I forget exactly), I find that if it comes on at night then it's
because it's pretty cold outside and it seems to keep the temp more
comfortable - mostly because it heats p quicker in the morning.

For me it works fine, as I said I leave the timer permanently one, but
YMMV of course
--
Chris French, Leeds