Programmable HW Cylinder Thermostats?
Kostas Kavoussanakis
Hi,
Is anyone aware of programmable HW cylinder thermostats? If the price
is right, I would not mid replacing my existing surface-mounting,
temp-control only, cylinder thermostat. A 5/2 would be fine, a 7-d
would be even better. My existing, 25-yo CH/HW programmer does not
discern between days of the week; we therefore either have the HW
needlessly on or run the risk of running our of HW. Because I have a
programmable room-stat, I have no burning ambition to upgrade the main
programmer (though I would not mind getting rid of it altogether if
the HW could also be managed from its own stat).
The Danfoss WP75-RF would do it (if I had a matching receiver module),
but it's too expensive as it does more than I need (wireless).
http://randall.danfoss.com/xxTypex/296792_MNU17433353_SIT313.html
TIA,
Kostas (nope, I am not holding my breath)
Toby
I think you really need to replace the programmer for one that will do both
HW ancd CH seperatly!
I assume your system is fully pumped and you have either a 3 way valve or at
least two seperate valves, one beinf for the HW?
Toby...
Michael Chare
news:Pine.SOC.4.64.09...@tnearg.rcpp.rq.np.hx...
I use a Danfoss TP9. This is a wired 2 channel programmer. It can be set
for either a fully pumped system or one with one with gravity H/W.
--
Michael Chare
Dave Pickles
I've been looking for the same thing.
25 years ago I designed my own microprocessor-controlled heating
controller (and published the design in one of the electronics rags).
There is nothing on the market now which comes anywhere close. For
example to vary the temperature by programme - lukewarm for hand-washing,
hot for baths and showers - or to make a tank of hot water then switch
off and stay off even if the cylinder goes cold again.
Dave
Kostas Kavoussanakis
> Kostas Kavoussanakis wrote:
>>
>> Is anyone aware of programmable HW cylinder thermostats? If the
>> price is right, I would not mid replacing my existing
>> surface-mounting, temp-control only, cylinder thermostat. A 5/2
>> would be fine, a 7-d would be even better. My existing, 25-yo CH/HW
>> programmer does not discern between days of the week; we therefore
>> either have the HW needlessly on or run the risk of running our of
>> HW. Because I have a programmable room-stat, I have no burning
>> ambition to upgrade the main programmer (though I would not mind
>> getting rid of it altogether if the HW could also be managed from
>> its own stat).
>>
>> The Danfoss WP75-RF would do it (if I had a matching receiver
>> module), but it's too expensive as it does more than I need
>> (wireless).
>>
>> http://randall.danfoss.com/xxTypex/296792_MNU17433353_SIT313.html
>
> I think you really need to replace the programmer for one that will do both
> HW ancd CH seperatly!
>
> I assume your system is fully pumped and you have either a 3 way valve or at
> least two seperate valves, one beinf for the HW?
Thanks Toby.
I am not sure what "fully pumped" means. I have a pump (separate to my
ancient, beloved boiler) that I hear when the CH is on; I am not sure
it works when HW is on. I think my HW is gravity fed. I have a 3-way
valve. As far as my Sangamo 410 programmer is concerned, I can have
the HW and CH on "once", "twice" or "24h" independently of each other.
Replacing the programmer is beyond my DIY means; it is unfortunately
buried in (imperial-size) tiles in my newly decorated kitchen, so it's
not a straight-swap job. Maybe when the boiler dies, hopefully in
25-30 years or so :-)
Kostas
Kostas Kavoussanakis
> "Kostas Kavoussanakis" <kavo...@epcc.ed.ac.uk> wrote in message
> news:Pine.SOC.4.64.09...@tnearg.rcpp.rq.np.hx...
>>
>> Is anyone aware of programmable HW cylinder thermostats? If the
>> price is right, I would not mid replacing my existing
>> surface-mounting, temp-control only, cylinder thermostat. A 5/2
>> would be fine, a 7-d would be even better. My existing, 25-yo CH/HW
>> programmer does not discern between days of the week; we therefore
>> either have the HW needlessly on or run the risk of running our of
>> HW. Because I have a programmable room-stat, I have no burning
>> ambition to upgrade the main programmer (though I would not mind
>> getting rid of it altogether if the HW could also be managed from
>> its own stat).
>>
>> The Danfoss WP75-RF would do it (if I had a matching receiver
>> module), but it's too expensive as it does more than I need
>> (wireless).
>>
>> http://randall.danfoss.com/xxTypex/296792_MNU17433353_SIT313.html
>
> I use a Danfoss TP9. This is a wired 2 channel programmer. It can be set for
> either a fully pumped system or one with one with gravity H/W.
Thanks, it (and its replacement, the TP9000) looks a good bet. But I
am not able to replace my programmer with sufficient ease[1], and it
would require that I chuck my programmable room stat.
However, this got me thinking: given that one has a programmable room
stat and a cylinder thermostat, could they wire the CH permanently and
use a cheaper 7-day, 1-channel programmer like the following
exclusively for the HW?
It still is not something that I could do myself, but thought I would
ask, for education if nothing else.
Kostas
SantaUK
Thermostats? I have a Thermflow 210 vented and would like to attach a
programmable thermostat.
http://www.mcdonald-engineers.com/images/literature/Therm%20Flow%20Lft.pdf
--
Regards
SantaUK
"Kostas Kavoussanakis" <kavo...@epcc.ed.ac.uk> wrote in message
news:Pine.SOC.4.64.09...@tnearg.rcpp.rq.np.hx...
>
Michael Chare
I can't see an logical reason for not having separate programmers if that is
what you want.
--
Michael Chare
Clint Sharp
<da...@cyw.uklinux.net> writes
>I've been looking for the same thing.
>
>25 years ago I designed my own microprocessor-controlled heating
>controller (and published the design in one of the electronics rags).
have this somewhere. I've been considering either retrofitting a simple
thermostat with a small PIC and wireless module to make a simple
wireless on/off controller and/or one of the larger PICs to make a
programmable controller so any reference could be useful, especially if
there's code with it.
>There is nothing on the market now which comes anywhere close. For
>example to vary the temperature by programme - lukewarm for hand-washing,
>hot for baths and showers - or to make a tank of hot water then switch
>off and stay off even if the cylinder goes cold again.
thermostat to stop it turning on again would be an excellent way of
preventing SWMBO WSIE putting the immersion on and forgetting about it.
>
>Dave
--
Clint Sharp
meow...@care2.com
AIUI what's wanted is not varying temps but varying quantities of hot
water. And there's a method out there to do this: With cheap rate
electric systems, 2 elements are used, one short one at the top of the
tank, and one full length one. The short top one produces a small
amount of hot water rapidly, the long one heats the bulk of the tank
up.
Your use of them would be a bit different to E7, arranging the bottom
one to only come on when you wanted bath or shower amounts of hot.
NT
Doctor Drivel
"Dave Pickles" <da...@cyw.uklinux.net> wrote in message
news:49be856c$0$2529$da0f...@news.zen.co.uk...
>> The Danfoss WP75-RF would do it (if I had a matching receiver module),
>> but it's too expensive as it does more than I need (wireless).
>>
>> http://randall.danfoss.com/xxTypex/296792_MNU17433353_SIT313.html
>>
>> TIA,
>>
>> Kostas (nope, I am not holding my breath)
>
> I've been looking for the same thing.
>
> 25 years ago I designed my own microprocessor-controlled heating
> controller (and published the design in one of the electronics rags).
> There is nothing on the market now which comes anywhere close. For
> example to vary the temperature by programme - lukewarm for hand-washing,
> hot for baths and showers - or to make a tank of hot water then switch
> off and stay off even if the cylinder goes cold again.
A heat bank/thermal store can do that and quite simply too.
Luke warm for basins? A TMV on the basins. Or a line dedicated for the
basin with one TMV for all basins
Another line for the rest of the outlets on a TMV
The shower directly off the cylinder and the thermostat on the mixer caters
for that.
To heat a cylinder of hot water and then stay off? The Horstmann E15 Boost
Timeswitch on http://www.screwfix.co.uk You press, the boiler stays on for
the time selected, the cylinder turns off, then the timer expires.
Kostas Kavoussanakis
> Kostas Kavoussanakis wrote:
>>
>> Is anyone aware of programmable HW cylinder thermostats? If the
>> price is right, I would not mid replacing my existing
>> surface-mounting, temp-control only, cylinder thermostat. A 5/2
>> would be fine, a 7-d would be even better. My existing, 25-yo CH/HW
>> programmer does not discern between days of the week; we therefore
>> either have the HW needlessly on or run the risk of running our of
>> HW. Because I have a programmable room-stat, I have no burning
>> ambition to upgrade the main programmer (though I would not mind
>> getting rid of it altogether if the HW could also be managed from
>> its own stat).
>>
>> The Danfoss WP75-RF would do it (if I had a matching receiver
>> module), but it's too expensive as it does more than I need
>> (wireless).
>>
>> http://randall.danfoss.com/xxTypex/296792_MNU17433353_SIT313.html
>
> AIUI what's wanted is not varying temps but varying quantities of
> hot water. And there's a method out there to do this: With cheap
> rate electric systems, 2 elements are used, one short one at the top
> of the tank, and one full length one.
<snip>
Thanks NT. No, I am not even looking for something as sophisticated as
that (and I don't have cheap leccy, so I prefer to stick with gas). I
am looking for a way to have hot water (perhaps more than I need) when
I am in, while not running the boiler while I am not in.
I am in 3/7 days of the week. The easy thing with my current setup is
to have the HW on 6:30-21:00, 7/7 and that's that. What I would like
to do is have the HW on 6:30-21:00, 3/7, and on the other 4 days just
have it on morning and afternoon that I am in.
What is happening at the mo is the timer is on the morning-afternoon
setting, which invariably ends up either in a cold shower during the
w/e or moving it to 24hrs on the weekday that we are in, then
forgetting we have done this for a couple of months. :-)
Nope, this wife does not get the "advance" principle. :-)
Kostas (maybe I need a programmable wife? Or maybe I should stick it
on 24/7 and stop worrying about it?)
Dave Pickles
>>25 years ago I designed my own microprocessor-controlled heating
>>controller (and published the design in one of the electronics rags).
> I've got around 25 years worth of the UK electronics mags so probably
> have this somewhere.
Radio & Electronics World, July 1983. Good luck finding the parts, 256
BYTE memory chips will be rather hard to come by.
--
Dave
meow...@care2.com
If thats all you need, you can do that for a fiver with a plug-in
mechanical 7 day timer. Add to it a little relay with 240v coil,
making the switch contacts on the relay open the cylinder thermostat
when no HW is wanted, and close for normal operation when it is
wanted. And you can design it so the timer/relay section just unplugs,
restoring it to conventional operation.
NT
Clint Sharp
<da...@cyw.uklinux.net> writes
program flow than actually building from a published design though.
Unfortunately I don't have a massive collection of R&EW from that sort
of era anyway, I only bought the odd copy here and there and only
started buying it regularly about 4 years after that.
--
Clint Sharp
Doctor Drivel
Doctor Drivel
> Can these sensors be fitted to tanks that need Probe-type Cylinder
> Thermostats? I have a Thermflow 210 vented and would like to attach a
> programmable thermostat.
>
> http://www.mcdonald-engineers.com/images/literature/Therm%20Flow%20Lft.pdf
What exactly do you want to do?
Doctor Drivel
> Can these sensors be fitted to tanks that need Probe-type Cylinder
> Thermostats? I have a Thermflow 210 vented and would like to attach a
> programmable thermostat.
>
> http://www.mcdonald-engineers.com/images/literature/Therm%20Flow%20Lft.pdf
What exactly do you want to do?
Doctor Drivel
> Can these sensors be fitted to tanks that need Probe-type Cylinder
> Thermostats? I have a Thermflow 210 vented and would like to attach a
> programmable thermostat.
>
> http://www.mcdonald-engineers.com/images/literature/Therm%20Flow%20Lft.pdf
What exactly do you want to do?
SantaUK
allow for three showers each morning, and then at 10am to drop back to 60
degrees for day to day use. I dont think this type of tank stat will work
on mine. No insulation to remove etc.
--
Regards
SantaUK
"Doctor Drivel" <kill...@invalid.invalid> wrote in message
news:gpqu7q$6he$1...@news.motzarella.org...
Neil J. Harris
<sa...@northpole.com> writes
>Program my tank to call for more heat, such as 80 degrees in the morning, to
>allow for three showers each morning, and then at 10am to drop back to 60
>degrees for day to day use. I dont think this type of tank stat will work
>on mine. No insulation to remove etc.
>
use an additional thermostat on the hot water tank set to the lower (or
higher) temperature, it could be positioned at a height as well to
reduce the volume of heated water( rather like having two immersion
heaters on economy seven).
the only problem is you need a two-pole time switch if you got a
change-over type of thermostat like Y-plan ones.
I suppose if you were really clever you could ad a set-back heating
element to the thermostat, but that's not really a DIY proposition!
--
Neil J. Harris