[Hai-users] Multiple Thermostats per zone

[buzz2241 at sasktel.net]

I have 2 furnaces in my house, but each furnace is divided into 2 zones with omni controlled dampers in the ducts. Each furnace has one thermostat, but a temperature sensor placed on the other zone of each furnace tells my omni to open or close the damper as required to keep the 2nd zone at the correct temperature. the damper is very sensitive and takes 5 minutes to go from full close to full open. The major lesson I learned is to be patient with the damper adjustment - you are not going to change the temperature in a few minute period.......


Are you able to place a damper (or two) in your home theatre room duct(s) with its own temperature sensor there - you could then use the omni to control the damper?

If not - in your case - you do need one of your tstats to be the master and one to be the slave so they don't over cycle the heating / cooling unit - but there are also ramp up and ramp down times to consider as well....

Does anyone know if the omni (or other compatible thermostat) can be used in a master slave configuration? 

----- Original Message -----
From: Brad <looney2ns at sigecom.net>
Date: Wednesday, July 26, 2006 3:04 pm
Subject: RE: [Hai-users] Multiple Thermostats per zone

> This is not trivial to accomplish. To add to others comments, I highly
> recommend you talk to a reliable HVAC installer about doing this.
> 
> -----Original Message-----
> From: hai-users-bounces at tssi.com [hai-users-bounces at tssi.com] On
> Behalf Of LarryH
> Sent: Wednesday, July 26, 2006 4:50 PM
> To: hai-users at tssi.com
> Subject: Re: [Hai-users] Multiple Thermostats per zone
> 
> It is not common to put two thermostats on a single zone.  I'm not 
> sure how 
> a setup like that would really work.  I suppose if they were in 
> parallel 
> than the zone would heat or cool if either of the stats called for 
> a cycle. 
> I don't think this setup would have a good result.  Many stats 
> (like the RC 
> series)  have settings for a maximum number of cycles per hour, 
> and a 
> required off time between cycles.  Much of this is to promote 
> efficiency by 
> regulating short cycling or to protect the equipment.  Multiple 
> stats 
> doesn't play well with this type of setup.  I believe there are 
> some 
> products out there which can have multiple temperature sensors 
> going to a 
> single stat.  The stat then does some type of temperature 
> averaging.  I 
> believe the custom stat which goes with the Rheem/Rudd modulating 
> furnace 
> can be setup this way.
> 
> If the temperature demands are different in the two areas, you 
> should 
> probably look at getting it zoned.  With air based 
> heating/cooling, it's not
> 
> always easy to micro-zone a house.  The equipment needs a certain 
> minimum 
> air flow to work safely for heat and to prevent freeze-up with 
> cooling.
> 
> ----- Original Message ----- 
> From: "Rutherford, Austin" <Austin.Rutherford at cognos.com>
> To: <hai-users at tssi.com>
> Sent: Wednesday, July 26, 2006 3:07 PM
> Subject: [Hai-users] Multiple Thermostats per zone
> 
> 
> > Hello all,
> > I am in the final stages of finishing my basement.  One of the 
> rooms is
> > a home theater and am considering putting a thermostat in there -
> but
> > there is already a thermostat in another room on that zone.  Is it
> > reccomended/supported/common to put two thermostats in different 
> rooms> on the same zones?  It would be for heating/cooling.  The 
> hookup to the
> > OP2 would be easy, but I am guessing that I would have to wire 
> the HVAC
> > in parallel with the existing thermostat.
> >
> > Thoughts/suggestions?
> >
> > Thanks,
> > Austin
> >
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