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HVAC problem-new(pic)
phillip
Member Posts: 2,948
[img][/img]OK, My t-stat and trnsfmr were crap.I found a new t-stat,A ritetemp model # 8095.I found out that the RH and the W terminals are the contacts.However the C terminal,Appears to be power for the t-stat.How can you provide power to something with only one leg?This is the new diagram Ive come up with.How the heck do I power the t-stat?
Comments
What are you trying to do, heat, or cool?
I presume cool, as it is only a fan you have described,......if that is the case, you bought the wrong t-stat.
If you would like to e-mail me, feel free, but it may be a day or so before I get back to you.
You are making a simple project into a complicated one.[:(]
W - HEATING CONTROL
G - FAN RELAY
C - 24 VAC COMMON (optional)*
Y - COOLING COMPRESSOR
RC - COOLING TRANSFORMER
O - DAMPER OR CHANGEOVER VALVE (POWERED IN COOL)
B - DAMPER OR CHANGEOVER VALVE (POWERED IN HEAT)
* The optional C-wire should be connected if available, it will extend your battery life significantly.
You now have T-stat meant for heat only, where the contacts close on temperature drop.
What are you trying to do, heat, or cool?
I presume cool, as it is only a fan you have described,......if that is the case, you bought the wrong t-stat.
If you would like to e-mail me, feel free, but it may be a day or so before I get back to you.
You are making a simple project into a complicated one.[:(]
Marc nailed it.... U shouldda looked at the packaging your 'stat came in,. Or called a professional....
Jeff
quote:Originally posted by Marc1301
You now have T-stat meant for heat only, where the contacts close on temperature drop.
What are you trying to do, heat, or cool?
I presume cool, as it is only a fan you have described,......if that is the case, you bought the wrong t-stat.
If you would like to e-mail me, feel free, but it may be a day or so before I get back to you.
You are making a simple project into a complicated one.[:(]
Marc nailed it.... U shouldda looked at the packaging your 'stat came in,. Or called a professional....
Jeff
This is a project,Not a job.The t-stat was some stuff pops had in the junk bin.I realize that I could buy this device But like I said...Its a project[:)]
Answer that simple question.
If that is true,........as I presume with a fan only, you have the wrong t-stat.
Unless you are going to put the fan in behind a heater!
the contacts open when its turned down to say 70.When i increase the temp ,the contacts close.Thats what i want to happen right?
What you are describing above, is if you want to "raise" the temp, which a fan only cannot do!
After reading all of this confusion, I would HIGHLY recommend, hiring someone to do this simple "project" for you!
No offense meant BTW[8D]
If you have a 24vac (coil voltage) DT type relay, you could put your fan across the Com & NC contacts. When the T-stat is calling for heat (temp below set point) the relay will turn on, opening the fan power line. When the T-stat is above the set point (not calling for heat) the relay will turn off, closing the fan power line.
If you only have a ST type relay, than you will need to get a T-stat that closes ABOVE the set point (IE: a cooling style T-stat).
BTW, relays are cheaper than thermostats, if $$$ are a issue.
On a 9 pin "ice cube" style DPDT relay, the coil leads are pins 2 & 8, pins 1 & 9 are common, pins 3 is NO to pin 1 and pin 4 is NC to pin 1 (I can't remember what the designation for # 5&6 is off the top of my head). To do what you have drawn, your fan would use pins 1 & 3, while my suggestion would use pins 1 & 4.
a decent thermostat couldnt handle.