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Fw: Replacing and automating the Central Heating switch (PIC
fixed)
- Subject: Fw: Replacing and automating the Central Heating
switch (PIC fixed)
- From: Gareth Cook <g@xxxxxxxxxx>
- Date: Thu, 2 Feb 2006 11:47:18 +0000
Life's just a big lottery - i'll use a lot of warning stickers :-)
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
----- Forwarded by Gareth Cook/UK/IBM on 02/02/2006 11:34 -----
Discussion
Main Topic
ukha_d@xxxxxxx
Today 11:14
.
Subject:
.
RE: [ukha_d] Replacing and automating the Central Heating switch (PIC
fixed)
.
Category:
That could work Gareth but I think it is safer to keep mains associated
with the boiler in the boiler
Running a control to the boiler is the best bet
Imagine you go back to the relay unit in two years looking for a fault
You isolate the mains feed to the cbus relay unit assuming it is then
safe to work on
Forgetting the "other" mains feed coming in from the boiler
Your HA system isn't calling for heat
So when you test for live mains there isn't any
Half way through your fault finding the HA system calls for heat
As you lie on the floor shaking you remember the mains coming in from
the boiler you ran 2 years ago
OR
You could just put a big message on the dimmer ;-)
My 2d worth
Mike
________________________________
From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf
Of Gareth Cook
Sent: 02 February 2006 09:19
To: ukha_d@xxxxxxx
Subject: Fw: [ukha_d] Replacing and automating the Central Heating
switch (PIC fixed)
Or
I could install a 2-way light switch between the feed to the old timer
and
cbus, and the feed to the boiler. So when switched one way, CBUS
controls
feed. When the boiler man arrives, flick the switch and the old timer
module now controls the feed.
Sounds plausable...
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
----- Forwarded by Gareth Cook/UK/IBM on 02/02/2006 08:58 -----
Discussion
Main Topic
ukha_d@xxxxxxx
Today 00:28
.
Subject:
.
RE: [ukha_d] Replacing and automating the Central Heating switch (PIC
fixed)
.
Category:
That works!
What I have done is put a relay from the Timer output to the boiler
Then I run the timer to always be on
The relay the says when it is off via in my case HomeVision
The advantage of this is I then have a test mode where the relay is
always on
So if any one comes to fix the boiler
Put it into test mode and as far as they are concerned it is a normal
control system they are used to
I have a 12v 2 mains relay in the boiler
That way nothing control wise leaves the enclosure
Far better that running mains from the boiler to the C-bus relay and
back again
If that isn't clear give me a bell or mail
Mike
http://tinyurl.com/bqo3r
G.
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