Fw: [xap_automation] Heating Control

[Gareth Cook <g@xxxxxxxxxx>]

I've just taken delivery of the network Heatmiser units. The
thermostat is
low voltage, with the relay gubbins happening elsewhere. Then there's a
touchscreen that will control all 6 thermostats.

Shout if this may help

G.

Gareth Cook
IT Architect / Project Manager, SWG Sales
IBM SWG Sales - Lotus Park, Staines, TW18 3AG
Office: +44 (0)1784 445166 - Mobile: +44 (0)7980 445166
email: g@xxxxxxx


----- Forwarded by Gareth Cook/UK/IBM on 22/12/2006 18:15 -----

Discussion
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xap_automation@xxxxxxx
Today 15:55

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Subject:
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Re: [xap_automation] Heating Control
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Hi Kevin, Thanks for the reply...

I have a DS1820 located on an inside wall at switch height reading the
same temperature a digital clock that sits on the mantle piece.
Unfortunately I only have cat5 to this an no way to run the correct
cable for a new thermostat.

I have TVR's on the radiators upstairs, but manual ones.. I may be able
to run some cat5 or other their to put controllable ones there, and
create a pseudo zonal heating system...

So then I would need a mains rated relay that would respond to software
control to switch on or off as the temperature fluctuates...I would
probably only use the lounge temperature anyway as that is where we
spend most of the time at home.

I don't have the necessary skills to build anything so would ideally be
after an off the shelf device that I could wire up (the wire to the
thermostat runs close to Node 0 so diverting is not a problem. I guess
then I would need a manual override incase the server died...

All sounds like running wire to the inside wall would be easier... but
nowhere near as much fun!!!!

Neil

Kevin Hawkins wrote:
> Ooops right reply list this time...
>
> Hi Neil,
>
>    Not quite sure what you're wanting here. Presumably you are saying
> that the current thermostat is reading low because it is influenced by
> the outside temperature. Assuming you have reasonably insulated walls
I
> can only assume the localised temp is being influenced by a large area
> of windows or by a draught, or it's behind a curtain . The thermostat
is

> switching based on the temp it sees locally of course. Replacing the
> thermostat with another located in the same place will very likely
just
> produce the same result.  Far better would be to re-site the
thermostat
> to somewhere more reactive to the actual room temperature.   The
normal
> system of having the main , and only thermostat in a colder area of
the
> home is typical because if you can satisfy that area then it is
assumed
> you can also satisfy all other areas too. If you have it switching in
> your warmest area then the cooler areas can never demand enough heat
to
> reach setpoint.   Handling multiple demands in different rooms
requires
> zoning of the heating system or more usually now thermostatic radiator
> valves - which might be a sensible solution for you ? 28.5 deg C is
very

> hot !!  There are some networkable thermostats available too that I
> believe will aggregate the demand back to the boiler (Sensible Heat)
>
>    If you are actually asking if there is some device that you could
> use instead of the thermostat that would switch the boiler (and taking
> input from xAP TOM10) then you could use Floorplan and a xAP
> controllable relay to achieve this.  Cheapest would be attaching a
relay

> to your PC's parallel output port but this I think is a do it yourself
> job - ensure you have a protection diode across the coil or you will
> damage teh parallel port. . I am not sure if the parallel port outputs
> can supply enough current to switch relays - you would have to
> investigate this, there may be some prebuilt kits too although the
> relays might not be rated sufficiently to use directly to the boiler.
.
> KevinT has some xAP software that would drive this. There are a number
> of other prebuilt devices that attach to a PC and give relay outputs -
I

> think again KevinT has some xAP software for some. You could do this
via

> a xAP Netiom too or a controller like HomeVision etc.    Please note
the

> boiler is probably switching mains voltage directly and so the relays
> must also be mains rated - you may need to use two interconnected
relays

> to get up to this rating. Also you must take appropriate precautions
> when wiring the mains switching as it can be lethal of course.   
Beware

> that some  HVAC switching systems use 24V rather than what I expect is
> mains switching in your case.  You only effectively have to replace
some

> normally open (closed to generate demand) relay contacts , assuming
> there are just two wires there, but they must be mains 230V rated.
>
>    Kevin
>
> Neil Frost wrote:
>
>> Next question...
>>
>> I'm using xAP TOM10 to report some room temperatures. These are
>> displayed using FloorPlan.
>>
>> The current thermostat in the lounge is on an outside wall, as it
gets
>> colder so I have to turn the thermostat down. It was down to 17deg
C
>> last night and the room was actually 28.5deg C.
>>
>> Is there a bit of kit that I can replace my existing thermostat
with
and
>> get it to switch the boiler on / off based on the temperature of
the
room?
>>
>> The thermostat uses 2 wires wired straight into the combi
boiler... and

>> is a basic "turn it round to select the temperature, and you
can hear
it
>> clicking on and off"
>>
>>
>> Thanks
>> Merry Christmas
>>
>> Neil
>>
>>
>>
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