Does anyone know of a programmable room stat with double pole switched
outputs? This would save me having the added complexity of either a zone
valve, or additional external relays. It must have a 1-2 hour boost function
and either 5/2 or 7 day operation.

Christian.

In message ,
"Christian McArdle" wrote:

Does anyone know of a programmable room stat with double pole switched
outputs? This would save me having the added complexity of either a zone
valve, or additional external relays. It must have a 1-2 hour boost function
and either 5/2 or 7 day operation.


Can I be rude and ask why? I could have done with something similar
recently but ended up fitting a relay instead. Saved me changing to a
mid position valve with all the complex wiring that involves though.
Yeah, perhaps the radiators do go a bit cooler after a bath, but it's
only 20 or 30 minutes...

Hwyl!

M.

--
Martin Angove: http://www.tridwr.demon.co.uk/
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Can I be rude and ask why? I could have done with something similar
recently but ended up fitting a relay instead.

I'm going to run two fan convectors off a single 2 port valve. I want the
valve to operate when either programmable room thermostat calls for heat,
but control each fan convector separately. As far as I am aware, the fan
convectors do not have any auxilliary switch terminals for when they
activate. However, I'll be happy to be told otherwise (Myson Kickspace 800).

I need the zone valve, as the primary circuit for HWC only is about a 2
metre round trip. Having the fan convector loop open would increase the
primary circuit to around 40m, even in summer, much of which (i.e. the bits
I haven't done) is uninsulated. (No, I'm not ripping up all my lovely
floorboards to lag them!)

Christian.

"Christian McArdle" wrote in message
. net...

Can I be rude and ask why? I could have done with something similar
recently but ended up fitting a relay instead.

I'm going to run two fan convectors off a single 2 port valve. I want the
valve to operate when either programmable room thermostat calls for heat,
but control each fan convector separately. As far as I am aware, the fan
convectors do not have any auxilliary switch terminals for when they
activate. However, I'll be happy to be told otherwise (Myson Kickspace
800).

The Myson has an integrated pipe stat. It only operates the fan when the
heating coil is up to temperature.

To have two Kickspace each controlled by a programmer/stat and one 2-port
valve, will require the odd relay or two to work right. As relays are not
that cheap you may as well make is very easy and fit two 2-port valves, one
for each Kickspace. BES sell them for £21 + VAT.

I need the zone valve, as the primary circuit for HWC only is about a 2
metre round trip. Having the fan convector loop open would increase the
primary circuit to around 40m, even in summer, much of which (i.e. the
bits
I haven't done) is uninsulated. (No, I'm not ripping up all my lovely
floorboards to lag them!)



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As relays are not that cheap you may as well make is very easy and
fit two 2-port valves, one for each Kickspace. BES sell them for £21 +
VAT.

The problem is that it is very easy to get a single zone valve in. When I
installed the upstairs/downstairs zone valves, I actually put the plumbing
in for an additional one. I suppose I should have thought more about it and
put in two extras. Putting two in would look less neat. It isn't really
necessary to have two valves, either. It is unlikely that one room would
need heat and not the other, and the heat rating of the convector with the
fan off is very unlikely to be greater than the heat loss of the room.

The other alternative is to run the kitchen convector off the downstairs
circuit and just have a room stat to run the fan. I could live with the
kitchen off the same timing as the downstairs. It is only the conservatory
where I anticipate the need for radically different timing.

Christian.

"Christian McArdle" wrote in message
. net...
As relays are not that cheap you may as well make is very easy and
fit two 2-port valves, one for each Kickspace. BES sell them for £21 +
VAT.

The problem is that it is very easy to get a single zone valve in. When I
installed the upstairs/downstairs zone valves, I actually put the plumbing
in for an additional one. I suppose I should have thought more about it
and
put in two extras. Putting two in would look less neat. It isn't really
necessary to have two valves, either. It is unlikely that one room would
need heat and not the other, and the heat rating of the convector with the
fan off is very unlikely to be greater than the heat loss of the room.

The other alternative is to run the kitchen convector off the downstairs
circuit and just have a room stat to run the fan. I could live with the
kitchen off the same timing as the downstairs. It is only the conservatory
where I anticipate the need for radically different timing.

The problem with not having a zone valve on a Kickspace is that the cupboard
above the Kickspace gets hot. The fan may be off, but the system is still
pumping hot water around. It looks like you will need a relay. One will
do.

Stat 2 energises relay.
contact switch energises KSP 2
One contact switch has the Zone valve on the pole terminal
The N/C terminal from this switch is fed from stat 1, which also energises
KSP 1
Other terminal of switch contact is fed from stat 2

Simple.



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Version: 6.0.552 / Virus Database: 344 - Release Date: 15/12/2003

The problem with not having a zone valve on a Kickspace is that the
cupboard above the Kickspace gets hot. The fan may be off, but the
system is still pumping hot water around. It looks like you will
need a relay. One will do.

Thinking about it, I don't really want to pump through the conservatory
heater when it is turned off. This will be much of the time during winter,
as I anticipate heating only 1-2 hours a day, whilst the kitchen will be on
a lot. Maybe, I'll just run an unzoned 22mm past the kitchen into the
conservatory and install 2 port valves locally to the heaters. There'll be
plenty of space under the kitchen units for the valves, I suppose, if I
position the pipework so the valves are near the plinth for servicing.

Christian.