Re: Replacing and automating the Central Heating switch

["Dean Smith" <dean@xxxxxxxxxxxxxxx>]

Depends what systemd you have currently.

If you have seperate valves for your Hot Water and Heating systems then yes
its probably that simple. If you have the more common 3-way valve for both
Heating & Hotwater and "Y-Plan" wiring you need to have 3
signals.....

Heating Required
Hotwater Required
Hotwater Not Required

The last 2 can be achieved with a single relay if its "double
throw" - no idea if CBUS relays are. You can do it with 2 single throw
relays - you just need to make sure the programming ensure that either
"hotwater required" or "hotwater not required" is
energised but neither both together or none.

My wiring for Comfort control

http://www.eatworms.org.uk/ha/heating.php

Y-Plan wiring

http://www.eatworms.org.uk/YPlan-CentralHeatingWiring.jpg

Dean

----- Original Message -----
From: Gareth Cook
To: ukha_d@xxxxxxx
Sent: Wednesday, February 01, 2006 1:05 PM
Subject: [ukha_d] Replacing and automating the Central Heating switch


Just wanted to clarify something here - I was thinking of CBUS'sing the
Heating system by just bypassing the timer switch.

Currently we have a seperate temperature sensor - I wont touch that. What
Im thinking I can replace is the timer switch - All it seems to do is just
make a electrical connection at a certain time for the heating and the
water tank (one for each)

So in theory, I should be able to take the live and common for these , and
just plug them straight into a CBUS relay channel (just like an X10 AM10).
I can then use Comfort's logic to activate the relays etc, and have a CBUS
switch show the status and can use that to override as well.

I'll also assume that it's 240v, and that it's less than 10Amps !

All make sense ? Anything Im missing ?

G.

Gareth Cook
Tools and Process Architect
IBM SWG Sales - Lotus Park, Staines, TW18 3AG
Office: +44 (0)1784 445166 - Mobile: +44 (0)7980 445166
AIM Chat : TheBoyG - MSN Chat : chat@xxxxxxx
email: g@xxxxxxx








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