T'stat Recommendation

Pete Groenewold

I'm doing the HVAC on an addition that includes a sunroom with in-floor radiant heating served by a dedicated boiler. The remainder of the addition is heated and cooled by a new ducted, zoned forced-air system. The forced-air system is also providing cooling and (ideally) auxiliary heating to the sunroom, which is on its own zone.

The ideal sequence of operation seems straightforward. On a call for cooling from the sunroom zone, the damper in the sunroom's air duct opens, the air conditioner condenser starts, and the system runs until the zone is satisfied. On a call for heating, the circulator for the radiant tubing will come on. If the room temp continues to drop below setpoint (starting from a cold slab, for example) the damper in the sunroom's air duct will open and the furnace will provide auxiliary heat.

My question: I don't see that Tekmar provides a 'stat with three-stage capability. I only see two-stage (heating + cooling or two-stage heating) versions. Do any of you know of a good three-stage 'stat that's suitable for use with radiant heat? Or am I going about this all wrong. By the way, don't ask why the entire addition wasn't heated with radiant zones... sometimes you take the projects as they come.

Thanks in advance for your recommendations.

Regards,

PG

BillW@honeywell

We have a stat...

that is capable of 3 stages of heat and two stages of cooling. It's the new VisonPro 8000, part number TH8320U1008. It's a 7 day programmable, 4 periods/day, adjutable from 1 to 12 CPH, touchscreen convenience, +- 1 degree accurate and mercury-free.It also has O&B terminals for use with a damper. They're availble from any Honeywell distributor. I have reservations about using setback stats on radiant floors, however, in this case, I think it will work well. Also be advised that this stat senses air temperature only. For more info go to www.hotfreshcool.com, or try http://hctechlit.honeywell.com, and type in the part number for tech sheets.

Dale

Heat pump stat

Can you use a heat pump stat with H1 and H2 and just one stage for cooling? I would use an isloation relay to be sure the cooling was locked out if the floor radiant was calling.

Ken_8

I have had a chance to check out

the new Honeywell Vision Pro 8000. (Thanks Bill)

I think Honeywell finally got the word "universal" nailed!

What blows my mind is the 24 volt power stealing optional powering method - OR, 3- (included in the box) AAA batteries!



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S Ebels

Hey Bill

We just installed a couple on a commercial job last week. Our first use of the 8300 series. I was impressed with darn near everything about that stat. If it holds up it'll be all I use from now on. A VERY NICE piece!

Ken D.

Stat

I recommend the Honeywell. All positive experience.

BillW@honeywell

Thanks for the kind words...

I think we've got a winner here. Check out the website www.hotfreshcool.com.

BillW@honeywell

Thanks for the good thoughts...

I'm glad you liked it, Ken.

Pete Groenewold

Thanks...

Thanks for the responses. I'll give the Honeywell a shot. I appreciate your time.

Regards,

PG