[Hai-users] Multiple Thermostats per zone

[LarryH]

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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