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PID and motor connection drawing with highlimit relay
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Hi John point taken thanks. I also agree that ssr usualy fail in closed condition and as such are another thing to worry about. I have not come across a thermopile controlled thermostat which is adjustable, can you enlighten me?
Regards
Dom


Dom

You can not change the winds, but you can reset your sails.
 
Location: South Australia | Registered: October 05, 2008Reply With QuoteReport This Post
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Ive been looking into something like this. let me know what you think. they have them with or with out the relays built in. http://www.ledclocks.com/contr...2ClassicControl.html
 
Location: Central Wisconsin | Registered: September 13, 2011Reply With QuoteReport This Post
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quote:
I have not come across a thermopile controlled thermostat which is adjustable, can you enlighten me?

Good question Dom! While many years ago thermopile t-stats were the norm for home and commercial furnaces, unit heaters, etc, I have not seen one in years... They also used to be common in commercial gas appliances... I have not run a service truck in many years though so I am not sure if they are still used or not...
I would have to visit the supplier to see whats available today, I am sure Google would turn up some hits too.

hddmax66,
That looks like it will do what you want, whats the price though?

Cheers,
Jon
 
Location: Wellington County, Ontario Canada | Registered: February 07, 2008Reply With QuoteReport This Post
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The only units I have ever seen in Australia are a set unit used to prove flame presence but these are not adjustable and need aprox 350 C to activate the contacts. Dont wory too much just an enquiry I dont need one.
Thanks Dom


Dom

You can not change the winds, but you can reset your sails.
 
Location: South Australia | Registered: October 05, 2008Reply With QuoteReport This Post
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The only units I have ever seen in Australia are a set unit used to prove flame presence but these are not adjustable and need aprox 350 C to activate the contacts.

Yes they are common here as well, typically just a single thermocouple is used to prove flame over here though. Its usually just a short copper lead that goes to the gas valve. I think the idea of the thermopile (just a group of thermocouples connected in series) was to provide enough current to allow for a longer lead wire to the wall mounted thermostat. Though I am only speculating Wink
I did a quick check on ebay and I see that you can still buy the millivolt residential stats though it appears they are not very common anymore...
http://www.ebay.ca/sch/i.html?...=p3286.c0.m270.l1313
I just got to thinking, you probably dont even have winter over there in beautiful Australia? Do homes over there utilize central heating or just central air conditioning?
I will have to come for a visit sometime and see for myself... when its winter here of course! Big Grin
Cheers,
Jon
 
Location: Wellington County, Ontario Canada | Registered: February 07, 2008Reply With QuoteReport This Post
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