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Reverse thermostat
I have this idea to draw the heat from the top of my Large poly tunnel and
to duct it through a channel of concrete blocks and gravel to form a heat sink. The problem is I am wondering if I can get some form of thermostat that will switch ON when the Temp rises and OFF when it falls. My local Electrical wholesaler doesn't know of anything to do the job. Any ideas? -- David Hill Abacus nurseries www.abacus-nurseries.co.uk |
Reverse thermostat
"David Hill" wrote in message ... I have this idea to draw the heat from the top of my Large poly tunnel and to duct it through a channel of concrete blocks and gravel to form a heat sink. The problem is I am wondering if I can get some form of thermostat that will switch ON when the Temp rises and OFF when it falls. My local Electrical wholesaler doesn't know of anything to do the job. Any ideas? -- David Hill Abacus nurseries www.abacus-nurseries.co.uk You want a thermostat with changeover contacts, eg Honeywell T4360 heat/cool. Neil |
Reverse thermostat
"David Hill" wrote in message ... I have this idea to draw the heat from the top of my Large poly tunnel and to duct it through a channel of concrete blocks and gravel to form a heat sink. The problem is I am wondering if I can get some form of thermostat that will switch ON when the Temp rises and OFF when it falls. My local Electrical wholesaler doesn't know of anything to do the job. Any ideas? -- David Hill Abacus nurseries www.abacus-nurseries.co.uk You want a thermostat with changeover contacts, eg Honeywell T4360 heat/cool. Neil |
Reverse thermostat
On Fri, 5 Mar 2004 15:47:07 -0000, "David Hill"
wrote: I have this idea to draw the heat from the top of my Large poly tunnel and to duct it through a channel of concrete blocks and gravel to form a heat sink. The problem is I am wondering if I can get some form of thermostat that will switch ON when the Temp rises and OFF when it falls. My local Electrical wholesaler doesn't know of anything to do the job. Any ideas? If you do a bit of clever wiring with a standard thermostat switch and a relay you can get what you want. I am sure an expert will be along in a minute. -- Knowledge is knowing a tomato is a fruit; Wisdom is not putting it in a fruit salad |
Reverse thermostat
On Fri, 5 Mar 2004 15:47:07 -0000, "David Hill"
wrote: I have this idea to draw the heat from the top of my Large poly tunnel and to duct it through a channel of concrete blocks and gravel to form a heat sink. The problem is I am wondering if I can get some form of thermostat that will switch ON when the Temp rises and OFF when it falls. My local Electrical wholesaler doesn't know of anything to do the job. Any ideas? If you do a bit of clever wiring with a standard thermostat switch and a relay you can get what you want. I am sure an expert will be along in a minute. -- Knowledge is knowing a tomato is a fruit; Wisdom is not putting it in a fruit salad |
Reverse thermostat
"Neil Jones" wrote in message ... "David Hill" wrote in message ... I have this idea to draw the heat from the top of my Large poly tunnel and to duct it through a channel of concrete blocks and gravel to form a heat sink. The problem is I am wondering if I can get some form of thermostat that will switch ON when the Temp rises and OFF when it falls. My local Electrical wholesaler doesn't know of anything to do the job. Any ideas? -- David Hill Abacus nurseries www.abacus-nurseries.co.uk You want a thermostat with changeover contacts, eg Honeywell T4360 heat/cool. Neil Here's the documentation for this:- http://europe.hbc.honeywell.com/prod...8281uk07r2.pdf The T4360D would do what you want, although it doesn't actually use changeover contacts, but a winter/summer switch instead. The T6360 range all appear to use changeover for heating/cooling. Regards Neil |
Reverse thermostat
In article , David Hill david@abacus
nurseries.freeserve.co.uk writes I have this idea to draw the heat from the top of my Large poly tunnel and to duct it through a channel of concrete blocks and gravel to form a heat sink. The problem is I am wondering if I can get some form of thermostat that will switch ON when the Temp rises and OFF when it falls. My local Electrical wholesaler doesn't know of anything to do the job. Any ideas? I don't understand the details of what you are doing, but ... Can you use the thermostat to switch on something of lower resistance to the thing you want to control and in parallel to it? Then you put the 'thing' on permanently, but if the temperature is too low, the thermostat circuit is open and short circuits the other. Once the temperature rises, the thermostat cuts out, closing off the short circuit and in effect switching the other circuit on. -- Kay Easton Edward's earthworm page: http://www.scarboro.demon.co.uk/edward/index.htm |
Reverse thermostat
"Neil Jones" wrote in message ... "David Hill" wrote in message ... I have this idea to draw the heat from the top of my Large poly tunnel and to duct it through a channel of concrete blocks and gravel to form a heat sink. The problem is I am wondering if I can get some form of thermostat that will switch ON when the Temp rises and OFF when it falls. My local Electrical wholesaler doesn't know of anything to do the job. Any ideas? -- David Hill Abacus nurseries www.abacus-nurseries.co.uk You want a thermostat with changeover contacts, eg Honeywell T4360 heat/cool. Neil Here's the documentation for this:- http://europe.hbc.honeywell.com/prod...8281uk07r2.pdf The T4360D would do what you want, although it doesn't actually use changeover contacts, but a winter/summer switch instead. The T6360 range all appear to use changeover for heating/cooling. Regards Neil |
Reverse thermostat
In article , David Hill david@abacus
nurseries.freeserve.co.uk writes I have this idea to draw the heat from the top of my Large poly tunnel and to duct it through a channel of concrete blocks and gravel to form a heat sink. The problem is I am wondering if I can get some form of thermostat that will switch ON when the Temp rises and OFF when it falls. My local Electrical wholesaler doesn't know of anything to do the job. Any ideas? I don't understand the details of what you are doing, but ... Can you use the thermostat to switch on something of lower resistance to the thing you want to control and in parallel to it? Then you put the 'thing' on permanently, but if the temperature is too low, the thermostat circuit is open and short circuits the other. Once the temperature rises, the thermostat cuts out, closing off the short circuit and in effect switching the other circuit on. -- Kay Easton Edward's earthworm page: http://www.scarboro.demon.co.uk/edward/index.htm |
Reverse thermostat
"Neil Jones" wrote in message ... "David Hill" wrote in message ... I have this idea to draw the heat from the top of my Large poly tunnel and to duct it through a channel of concrete blocks and gravel to form a heat sink. The problem is I am wondering if I can get some form of thermostat that will switch ON when the Temp rises and OFF when it falls. My local Electrical wholesaler doesn't know of anything to do the job. Any ideas? -- David Hill Abacus nurseries www.abacus-nurseries.co.uk You want a thermostat with changeover contacts, eg Honeywell T4360 heat/cool. Neil Here's the documentation for this:- http://europe.hbc.honeywell.com/prod...8281uk07r2.pdf The T4360D would do what you want, although it doesn't actually use changeover contacts, but a winter/summer switch instead. The T6360 range all appear to use changeover for heating/cooling. Regards Neil |
Reverse thermostat
"Neil Jones" wrote in message ... "David Hill" wrote in message ... I have this idea to draw the heat from the top of my Large poly tunnel and to duct it through a channel of concrete blocks and gravel to form a heat sink. The problem is I am wondering if I can get some form of thermostat that will switch ON when the Temp rises and OFF when it falls. My local Electrical wholesaler doesn't know of anything to do the job. Any ideas? -- David Hill Abacus nurseries www.abacus-nurseries.co.uk You want a thermostat with changeover contacts, eg Honeywell T4360 heat/cool. Neil Here's the documentation for this:- http://europe.hbc.honeywell.com/prod...8281uk07r2.pdf The T4360D would do what you want, although it doesn't actually use changeover contacts, but a winter/summer switch instead. The T6360 range all appear to use changeover for heating/cooling. Regards Neil |
Reverse thermostat
In article , David Hill david@abacus
nurseries.freeserve.co.uk writes I have this idea to draw the heat from the top of my Large poly tunnel and to duct it through a channel of concrete blocks and gravel to form a heat sink. The problem is I am wondering if I can get some form of thermostat that will switch ON when the Temp rises and OFF when it falls. My local Electrical wholesaler doesn't know of anything to do the job. Any ideas? I don't understand the details of what you are doing, but ... Can you use the thermostat to switch on something of lower resistance to the thing you want to control and in parallel to it? Then you put the 'thing' on permanently, but if the temperature is too low, the thermostat circuit is open and short circuits the other. Once the temperature rises, the thermostat cuts out, closing off the short circuit and in effect switching the other circuit on. -- Kay Easton Edward's earthworm page: http://www.scarboro.demon.co.uk/edward/index.htm |
Reverse thermostat
In article , David Hill david@abacus
nurseries.freeserve.co.uk writes I have this idea to draw the heat from the top of my Large poly tunnel and to duct it through a channel of concrete blocks and gravel to form a heat sink. The problem is I am wondering if I can get some form of thermostat that will switch ON when the Temp rises and OFF when it falls. My local Electrical wholesaler doesn't know of anything to do the job. Any ideas? I don't understand the details of what you are doing, but ... Can you use the thermostat to switch on something of lower resistance to the thing you want to control and in parallel to it? Then you put the 'thing' on permanently, but if the temperature is too low, the thermostat circuit is open and short circuits the other. Once the temperature rises, the thermostat cuts out, closing off the short circuit and in effect switching the other circuit on. -- Kay Easton Edward's earthworm page: http://www.scarboro.demon.co.uk/edward/index.htm |
Reverse thermostat
"David Hill" wrote in message ... I have this idea to draw the heat from the top of my Large poly tunnel and to duct it through a channel of concrete blocks and gravel to form a heat sink. The problem is I am wondering if I can get some form of thermostat that will switch ON when the Temp rises and OFF when it falls. My local Electrical wholesaler doesn't know of anything to do the job. Any ideas? I can only say your electrical wholesaler is an idiot, there are any number of manufacturers who make thermostats that can turn on or off on temp rise or fall or even with a two way or two pole switch do both. Honeywell would spring to mind but there are many others. -- Chris Thomas West Cork Ireland |
Reverse thermostat
"David Hill" wrote in message ... I have this idea to draw the heat from the top of my Large poly tunnel and to duct it through a channel of concrete blocks and gravel to form a heat sink. The problem is I am wondering if I can get some form of thermostat that will switch ON when the Temp rises and OFF when it falls. My local Electrical wholesaler doesn't know of anything to do the job. Any ideas? I can only say your electrical wholesaler is an idiot, there are any number of manufacturers who make thermostats that can turn on or off on temp rise or fall or even with a two way or two pole switch do both. Honeywell would spring to mind but there are many others. -- Chris Thomas West Cork Ireland |
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