RE: multi-zone central heating

["christopher purves" <CHRIS_PURVES@xxxxxxx>]

Can you expand on your description Rod ? I have installation quotes
arriving
this week - your solution could be a godsend but ... I need a few more
details to guarentee success I think!

I have found the valves online for around 30 quid.

Chris


----Original Message Follows----
From: "Rodney Hall" <rmh@xxxxxxx>
Reply-To: ukha_d@xxxxxxx
To: <ukha_d@xxxxxxx>
Subject: RE: [ukha_d] multi-zone central heating
Date: Thu, 13 Jan 2005 23:38:16 -0000


> -----Original Message-----
> From: David Amphlett [mailto:dave_yahoo@xxxxxxx]
> Sent: Thursday, January 13, 2005 5:04 PM
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] multi-zone central heating
>
>
>
>
> Anyone used something like this motorised valve:
> http://www.danfoss-randall.co.uk/Site/downloads/226.PDF
to
> control the water flow
> through each radiator individually?
>
> I'd like a thermostat in each room, and one of these for each
> radiator. I could then have the boiler switch on if ANY thermostat is
> triggered, and only have the valves open on the radiators in the
> rooms where the thermostats were triggered. (in other words, 1 zone
> per room).
>
> One thing I'm not clear on is whether I'd want to plumb these in
> under the floorboards or not - they seem to have a little metal
> slider which I assume is a manual switchover, which makes me think
> they should be visible.
>
> I think X10 is a reasonable control strategy for this sort of thing,
> and so assume I need a AW12 for each valve, but do AW12's respond to
> status requests to say whether they are currently on or off? (it
> seems like such a waste to have remote control, but have to do dead
> reckoning to figure out if stuff's on or not - status reporting
> should be mandatory on all X10 kit!)
>
> Any thoughts / experiences shared appreciated
>
> Dave

Yes, I have them throughout the house, just as you describe - Danfoss HPA2
series two port valves, each with their own room stat. I have them mounted
under floor, actuator upwards. You don't need to touch them in use - the
lever is for manual opening in case you need to for venting. I've never had
to do that because I use all skirting rads, which as far as the water is
concerned, is all copper and they self vent well. The DHW cylinder is on
the
same circuit, treated as a rad with its own thermostat and M/V. The boiler
and pump are switched by the M/V microswitches. I have a small rad in the
bathroom (behind the bath panel) permanently on to act as heat sink for
when
all rads shut down and the pump over-runs to dissipate heat after the
boiler
shuts down (two minute pump shutoff delay). The system works a treat and is
very economical, coupled with cavity wall insulation. The lot is controlled
by a timer/controller of my own make. This has been in operation for the
best part of 20 years.

--
Rodney Hall
Dum spiro spero
While I breathe, I hope
~~~~~~~~~~~~~~~
rmh@xxxxxxx
http://rmhh.co.uk/
http://rmhh.org.uk/
~~~~~~~~~~~~~~~~~~~