Hi
I have a solid fuel rayburn unpressurized gravity system with immersion heater back up for summer use when the rayburns not in use. When the rayburns running the hot water can get very hot, enough to cause the immersion thermostat cut out button to operate, this is a real pain as I have to reset it in order to use the immersion. Is it possible to still obtain thermostats without safety cut out buttons?

In article ,
rog writes:
Hi
I have a solid fuel rayburn unpressurized gravity system with immersion heater back up for summer use when the rayburns not in use. When the rayburns running the hot water can get very hot, enough to cause the immersion thermostat cut out button to operate, this is a real pain as I have to reset it in order to use the immersion. Is it possible to still obtain thermostats without safety cut out buttons?

You can get things a bit like TRVs, which instead of measuring room
temperature, measure hot water cylinder temperature and close off
the coil when it's up to temperature. (I presume this is an indirect
system?) I'm not sure what the right name for this is, so I'm
struggling to find it on google.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

Andrew Gabriel wrote:

rog writes:

I have a solid fuel rayburn unpressurized gravity system with
immersion heater back up for summer use when the rayburns not in use.
When the rayburns running the hot water can get very hot, enough to
cause the immersion thermostat cut out button to operate, this is a real
pain as I have to reset it in order to use the immersion. Is it possible
to still obtain thermostats without safety cut out buttons?

You can get things a bit like TRVs, which instead of measuring room
temperature, measure hot water cylinder temperature and close off
the coil when it's up to temperature. (I presume this is an indirect
system?) I'm not sure what the right name for this is, so I'm
struggling to find it on google.

Danfoss seem to call them Temperature Controllers.

http://www.danfoss.com/United_Kingdom/Products/Categories/List/HE/Temperature-Controllers/Temperature-Controllers/AVTB/ad618981-4f94-462a-8b5e-d4cb75e128cc.html

There are versions with variable maximum temperature up to 60 or 90 degrees.

The AVTB are a combined sensor an valve, the also have sensors that can
control separate valves if that suits better.

On 17/05/2014 21:15, Andrew Gabriel wrote:
In article ,
rog writes:
Hi
I have a solid fuel rayburn unpressurized gravity system with immersion heater back up for summer use when the rayburns not in use. When the rayburns running the hot water can get very hot, enough to cause the immersion thermostat cut out button to operate, this is a real pain as I have to reset it in order to use the immersion. Is it possible to still obtain thermostats without safety cut out buttons?

You can get things a bit like TRVs, which instead of measuring room
temperature, measure hot water cylinder temperature and close off
the coil when it's up to temperature. (I presume this is an indirect
system?) I'm not sure what the right name for this is, so I'm
struggling to find it on google.

The original ones were "silitron" valves or something similar... -
however you can do the same with a two port motorised valve and a
cylinder stat.

However I am not usre if that is permitted if the Rayburn is a solid
fuel one with gravity (thromo syphon) circulation?

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

Erm, surely if the water is getting so hot, it cannot be doing much good to
the heating element either. I'd have thought attempting to stop it getting
so hot was a safer approach.
Brian

--
From the Sofa of Brian Gaff Reply address is active
"rog" wrote in message
...
Hi
I have a solid fuel rayburn unpressurized gravity system with immersion
heater back up for summer use when the rayburns not in use. When the
rayburns running the hot water can get very hot, enough to cause the
immersion thermostat cut out button to operate, this is a real pain as I
have to reset it in order to use the immersion. Is it possible to still
obtain thermostats without safety cut out buttons?

No neither do I but they work much like the ones in some older cars to stop
the radiator boiling over etc.
Brian

--
From the Sofa of Brian Gaff Reply address is active
"Andrew Gabriel" wrote in message
...
In article ,
rog writes:
Hi
I have a solid fuel rayburn unpressurized gravity system with immersion
heater back up for summer use when the rayburns not in use. When the
rayburns running the hot water can get very hot, enough to cause the
immersion thermostat cut out button to operate, this is a real pain as I
have to reset it in order to use the immersion. Is it possible to still
obtain thermostats without safety cut out buttons?

You can get things a bit like TRVs, which instead of measuring room
temperature, measure hot water cylinder temperature and close off
the coil when it's up to temperature. (I presume this is an indirect
system?) I'm not sure what the right name for this is, so I'm
struggling to find it on google.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

Brian Gaff wrote:

Erm, surely if the water is getting so hot, it cannot be doing much good to
the heating element either.

Heating elements in kettles get to 100 centigrade, those in irons and
cookers over 200, doesn't seem to harm them.

rog wrote:
Hi
I have a solid fuel rayburn unpressurized gravity system with immersion heater back up for summer use when the rayburns not in use. When the rayburns running the hot water can get very hot, enough to cause the immersion thermostat cut out button to operate, this is a real pain as I have to reset it in order to use the immersion. Is it possible to still obtain thermostats without safety cut out buttons?

They are around.
I fitted two immersions into a thermal store last year and each had
provision for two stats. They were fitted with one normal adjustable
stat scaled up to 70 ish and the other also adjustable but with a reset
button for the over-temperature protection and wired in series.

It is obviously cheaper for the industry to use a single item if it will
fulfil both roles though.

I also bought a couple of high range stats - standard fitting but for
more industrial applications that were scaled up to 120.

Contact me directly if you want details of the source of those.

Bob

In article ,
Andy Burns writes:
Brian Gaff wrote:

Erm, surely if the water is getting so hot, it cannot be doing much good to
the heating element either.

Heating elements in kettles get to 100 centigrade,

Very much hotter when covered in scale.

Actually, that's the element outer casing - the element itself will
be well over 100C, as it's packed in magnesium oxide insulation.

those in irons and cookers over 200, doesn't seem to harm them.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

On Sat, 17 May 2014 23:02:22 +0100, John Rumm wrote:

However I am not usre if that is permitted if the Rayburn is a solid
fuel one with gravity (thromo syphon) circulation?

Even if permitted you really don't want to have anything able to
close the the gravity loop from a solid fuel boiler and a gravity
loop is what it should be as well, not pumped. Unless that pump is a
"load controller" set up to allow gravity circulation if the pump
isn't running.

--
Cheers
Dave.