[Hai-users] Multiple Thermostats per zone

[Jean-Claude Provost]

Hi,

Other than the fact that I personally would put a shorter timer (say 5
minutes), I think it's a great idea. 


Cheers from Varennes, Quebec Canada,

JC 
-----Original Message-----
From: hai-users-bounces at tssi.com [mailto:hai-users-bounces at tssi.com] On
Behalf Of Rutherford, Austin
Sent: Thursday, July 27, 2006 3:54 PM
To: hai-users at tssi.com
Subject: RE: RE: [Hai-users] Multiple Thermostats per zone

Hmmm...  I am starting to think that the easiest way would be to put a
motion sensor in the HT and when there is "Occupancy" turn on the HVAC
fan and it can recirculate the air between the HT and other parts in the
basement.  I already have three zones and I think that it would be
difficult to add a 4th zone for the HT now that the basement is finished
(also my zone controller is for only three zones!)

How does my alternative idea sound? When the sensor is triggers turn a
occupancy flag on for 60 minutes.(then it will keep extending occupancy
every time the sensor trips) and I can have the HVAC fan in the basement
turn on when the occupancy flag is on and turn it off when the occupancy
flag goes to off.

Thoughts?

Thanks,
Austin

-----Original Message-----
From: hai-users-bounces at tssi.com [mailto:hai-users-bounces at tssi.com] On
Behalf Of buzz2241 at sasktel.net
Sent: Thursday, July 27, 2006 1:03 PM
To: Brad
Cc: hai-users at tssi.com
Subject: Re: RE: [Hai-users] Multiple Thermostats per zone

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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