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You guys are too much. Glad to see this my forum is a vehicle for reminiscencing Sparky memories and conversations on where good "magic smoke" is harvested.

Kiss, I have come to the inevitable...

Whatchu talking about? Sparky? The fan or the stat? Guess I should go drinkin' instead of horsin' around with Sparky.

Not sure what you mean by "on continuously".
It shuts off when it reachs it's setpoint temp. Lil confused here.

KISS,
Of course. 24V AC was always the intent because of options. Keep in mind though budget. I don't mind adding relays and such, just have to keep bottom line in check.

WHOA! You da man. Ok, we'll just consider this our lil' sandbox here with this one.
Yea, I have the instr manual. WIll send you the page for the wiring.
What else can I do about the fan? Were you...

Just to let you know... I know my way around the electrical. I have put in hardwired undermount lighting and added 120v receptacles and switched outlets here and there so I am not completely green. ...

One thing I noticed about this model vs. auto, The housing actaully prevents you from manually switching to AUTO. So, with housing off, I can switch to AUTO, are all the hardwaire pieces there and...

No but I can get one from home depot or menards. Always wanted one anyway.
I am sending you the PDF for the model via email addy.

Ok, I procured a comparable model to the one I mentioned earlier but it is not auto-changeover.I got a great deal ($65 for either model) I can get the auto-changeover by 12/22 (backordered) .
So...

KISS,
I'm online now, gimme a few minutes or so to put some dinner down and will get to your answer. Thanks for yhour continued interest.

Actually I went there first. But after getting a user ID and signing in, THEN I read their site rules... NO DIY.
So, yeah, I could've dragged 'em through it pretending to be a HVAC contractor or...

Don't blame you a bit, MB. Thanks for your input. It has been enlightening and I will pursue the suggestions rendered in this forum. Cheers.
Nowwww where did I put my analog TV antenna...

Addendum. Let me reflect on my original obective: Replace archaic manual stat with programmable digital stat for energy savings and more presice temp control.

Now I have walked into a realm...

All this EE talk of throwing new relays and contactors into the witch's brew is making my headspin. Let's step back and scale back.

What if I lose the ability to auto-changeover<grimace>, make it...

You are correct. Fan has to blow whatever the temp of water is running through the pipes.
"chat" later...

Yep, that's it. But that works! I don't need another one of those. Ohhhhhh... I see you were thinking out load ;-). Is all my psycho-blabber starting to "connect"?

I am still unclear on how to attach pics/files. Infraview seems to be just a freeware image viewer. Is there a site I can attach images to and just post the links in this forum?

Actually, take peek at this http://www.ntsupply.com/files/products/62-0278.pdf

I would have places to put all my wires incl. the sensor wries. Which wiring scenario would be most applicable and...

KISS,

Would this model work in my application? It uses 120V AC input but I am not sure if it would work in my application. It is made by CAS.

Model No. System Fan Function...

MB or KISS,

Do you have enough information to render further assistance? You state it is a very common way of solving the line voltage issue but I am still seeking a feasible, practical solution...

If by two-way communcation between the stats is what you mean then, originally, communicating stats were considered but budget and simplicity overrode that option. If you meant something completely...

Loop temps are 42-48 and 120-140 respectively. The maint staff called it the Water FLow Sensor, which indeed does measure temp but HOW it works is beyond the scope of my objective, what it does is...

I will have to track down a maint staffer to answer the loop temp. I'll get back asap. Would a pic of the archaic system help? Being able to visualize always helps me. Not sure if I can attach...

Thermostat(7): International Environmental TC126

7 wires total. 3 from fan (blower)Red(HI),Blue(MED),Black(LO). 3 from sensor attached
to water pipe Yellow(? ),Light Blue(COOL), Red(HEAT). 1...

First, a brief description of my dilemma. In an effort to reduce heating/electric bills (going green!), I am in the process of replacing two mechanical line voltage fan coil thermostats in my condo...