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Re: Ultimate Central Heating Thermostat
- To: ukha_d@xxxxxxx, Stuart
Grimshaw <stuart@xxxxxxx>
- Subject: Re: Ultimate Central Heating Thermostat
- From: Ian Oliver <ioliver.lists@xxxxxxx>
- Date: Fri, 27 Oct 2000 18:30:21 +0100
- Delivered-to: rich@xxxxxxx
- Delivered-to: mailing list ukha_d@xxxxxxx
- Mailing-list: list ukha_d@xxxxxxx; contact
ukha_d-owner@xxxxxxx
- Reply-to: ukha_d@xxxxxxx
> Does anyone have any more info on these valves. Can they be retro
fitted to
> existing heating systems?
They are common. They are called "2 port" valves and they open
when power is
supplied. They also have a microswitch that closes when the valve opens.
Care is needed to not shut all the valves when the pump is running. Modern
boilers overrun the pump to cool their core, so you need either logic to
keep
a zone open or a pressure sensitive bypass valve. I have the latter and a
zone
valve for each of three floors.
Regards
Ian Oliver
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