An existing customer wants to add climate control to his Adagio system. His HVAC consists of 2 main floor Tstats and a basement Tstat. The main floor stats control AC, infloor heating and a back up air handler. The basement Tstat does infloor and air handler only.In a nut shell, the upper Tstats need to handle 2 x heat and AC and the basement Tstat needs to control 2 x heat.

I spoke to TB and the HVAC guy and they both were very vague in answering whether or not the Crestron units could do this? The HVAC guy told me that he wasn't sure because his brother had designed it and is no longer around. TB said I needed to consult the HVAC installer.

Any insight will help......Thanks


Ah yes...I forgot the Tsat model number that I want to use.....CHV-TSTATEX

Wireless may be a different story as some of these were different than the wired CHV-TSTAT. I'll look later on if no one else comments.

1. CHV-TSTAT was both C1 and C2 and W1 and W2. In other words, it can do heat and aux heat, as well as cool and aux cool.

2. Radient heat can be a problem, depending on the type. If it is a simple mixing valve Cresetron can control it. If it behaves as a manifod it cannot. The first is a digital system--on and off--the second analog where milivolts will cause the manifold to open some per cent between fully open and fully closed.

3. One of the keys here is how both systems were zoned.It is not unusual for AC and heat to be zoned differently. Assuming this is not the case, you should be able to do this but the devil is in the details. You will need the HVAC contractor to supply this information and you'll need to check if the EX TSTATs have W1 and W2. My memory of the original Infinet devices is they did not.

I am not sure this is a Crestron question as much as it is a HVAC question. To integrate a sub-system you have to understand it. You will also want to know how the heat is generated. My compressor uses a heat pump ( which I do not use )which is atypical but something to be aware.

How many zones are there in the radiate floor heating system on each floor? Depending on this size of the home and complexity of radiate floor heating, the system could have several zones per floor as well as corresponding wall and in-floor T-Stats for each zone.

Each zone is then equipped with corresponding motors/valves to move the fluid through the system.

Does the radiate floor system have a separate control system? If so, can you communicate with it and how does it work (see #2 on Alan's thread)? It may be easier to talk to the radiate floor heating system instead of trying to control the radiate floor system.

The CHV-TSTATEX stats do have W1 and W2


The information that I got from my preliminary conversation with the homeowner and the contractor is that upper floor stats have one zone of infloor per stat. The air is forced air. The secondary heat is forced air as a backup while the infloor is bring the temperature up.

Yes, exactly. There are 3 zones of infloor. 2 on the main floor and one in the basement. Each zone has a Tstat.