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RE: Thermostat with RS232
Hi Paul.
Firstly, I should start with a disclaimer. I am NOT an electrician, and
the following advice is based on the documentation I got with the
product, the documentation for my existing heating system and some
advice from a knowledgeable friend.
The kit comes complete with the thermostat, control unit, X10 interface
and power supply (I imported a US version so I had to get my own X10
interface and power supply). It is designed to replace a standard US
thermostat (which apparently seem to switch 24vAC). The doc for my
heating system is very specific about the thermostat having to be
capable of switching 240vAC, so what's needed is a way of safely
switching that 240v with a 24v output.
I've used the following items:
- 24vAc single-pole plug-in relay, with 10A contact rating (CSE part no
4031-8024)
- Relay base, for mounting the relay (CSR part no 9563/B)
- Two Maplins in-line fuses (one for each side of the relay)
- Some breadboard and a screw-shut Maplins project box to house
everything in.
Wiring is as follows (hope this is legible!):
TR15 Control Unit Maplins Project Box
-------------------+
+----------------------------------------------------------+
! ! +--------------------+
+----------------+ !
24vAC Return o---------------------!In line fuse (500mA)!---!
Relay ! !
! ! +--------------------+ !
! !
Heat o--------------------- !
! !
! ! ! !
! !
Fan o-------(NOT USED) ! --------------------------!
! !
! !
+----------------+ !
Compressor o-------(NOT USED) ! !
! ! !
! ! !
! +------------------+ !
Changeover o-------(NOT USED) ! !
! !In line fuse (5A) ! !
! ! !
! +------------------+ !
-------------------+
+-----------------------------!-----!----!-----------------+
!
! !
!
! !
+----!-----!----!--------+
! !
! ! !
! o
o o !
!
Thermostat terminals !
!
!
!
Heating System !
!
!
!
!
+------------------------+
As I said I'm awaiting the arrival of the relay before I can complete
this (at the moment everything is wired in except the connection to the
heating system - I've bypassed the thermostat controls), so if anyone
spots a problem with this please shout!
regards,
Julian
______________________
Julian Stuhler
DB2 Specialist, IBM Gold Consultant
Triton Consulting - The Database Experts
E-mail: julian.stuhler@xxxxxxx
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-----Original Message-----
From: Paul Robinson [mailto:ukcueman@xxxxxxx]
Sent: 25 February 2003 13:05
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] Thermostat with RS232
Julian,
What components do you need to use to get around the 24V/240V problem?
How are they wired?
TIA,
Paul
----- Original Message -----
From: "Julian Stuhler" <julian.stuhler@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Tuesday, February 25, 2003 10:52 AM
Subject: RE: [ukha_d] Thermostat with RS232
> I took delivery of a TR15 kit last week - it really is a very neat
unit.
> However please be aware that the unit is only designed to switch 24vAC
> and UK heating systems seem to need a thermostat capable of switching
> 240vAC! I also needed to move the location of the thermostat as the
> thermostat and control unit wouldn't talk to each other properly over
> the existing 3-core & earth cabling between the old thermostat and
the
> heating system. I used some 4-core security cable instead and it works
a
> treat.
>
> I had a fun weekend wiring it in but I wasn't able to complete the job
> as Maplins didn't stock the 24vAC relay I needed to allow it to
operate
> the thermostat input on my existing heating system. I eventually
managed
> to order one yesterday (from www.cse-distributors.co.uk). Hopefully
I'll
> be able to complete the job this weekend.....
>
> Julian
>
>
>
> -----Original Message-----
> From: Kevin Hawkins [mailto:lists@xxxxxxx]
> Sent: 25 February 2003 00:17
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Thermostat with RS232
>
>
> RCS do some - the TR15 and TR36
> http://www.resconsys.com/products/stats/serial.htm
>
>
>
> - but not cheap - the TR36 is particularly nice as I believe
it
> has
> a graphic LCD display screen and some buttons that can be programmed
to
> display automatically some user defined menus. I have been thinking of
> getting one for a while from the US.
>
>
>
> Kevin
>
>
>
> -----Original Message-----
> From: Dean Smith [mailto:ukha@xxxxxxx]
> Sent: 24 February 2003 23:48
> To: Ukha_D@Yahoogroups. Com
> Subject: [ukha_d] Thermostat with RS232
>
>
>
> I'd like to be able to control the temperature of my CH thermostat
> remotely
> via a PC
>
> One route would be to have Temperature sensors connected to the PC,
and
> then
> have the PC directly control the On/Off of the Central Heating (Which
I
> can
> do now via Comfort and some relays to bypass the timer control for an
> extra
> hour when I want it). I'd like to avoid though having the PC as
> absolutley
> necessary for normal running - prefer it just as a means of varying
the
> temperature when required.
>
> So anybody know of....
>
> A Thermostat capable of switching 240V
> Temperature Set Point controllable via RS232
> being able to Poll the Temp would be a bonus.
> Remote temperature sensor would be Ideal aswell.
>
> And of course it has to be *cheap*. So Honeywell Smartfit is out ;-)
>
> Thanks
>
> Dean
>
>
>
>
>
>
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