Hello!

I have an Omnistat connected to my Omni IIe. Connected to Zones 9-13 are five relays connected to 4 storage heaters and my underfloor heating. Right now the relays are not connected to any outputs on the controller, but I would ideally like to be able to switch the relays on or off dependent upon the room temperature (and ultimately remotely to turn them on and off as I drive up to the house, but thats later). I will also install some temperature sensors closer to a couple of the storage heaters to give more granular control, but the principle remains the same. I appreciate I need to connect the relays to an Output (as per instructions for a PESM I assume?) but how do I achieve the switching on/off of the relays?

Thanks
Marc

Marc
Are you being looked after by a trained HAI dealer? We have a formal training programme for HAI dealers and we are building up a national network. As you can imagine HAI is a very sophisticated product and requires a trained professional for a successful implementation. You can go to www.aldoussystems.co.uk and scroll down to the option that says "Find an HAI dealer".

To answer your question, there are many options. You can have an Omnistat per storage heater and use the built in relay to drive your relays or you can wire your relays into the outputs on the main panel and use programming to turn them off an on based on time or the iPhone app etc. if you want to make decisions based on temperature then you would need at least a temp sensor for each heater.

Thanks for the response, I suspected I needed programming to turn the heaters on and off remotely.

As for temperature sensors, I will get there, I just want to get the basic functionality working first. I doubt I would use Omnistats again, I don't find their operation to be particularly intuitive, although that could be, to your other point, due to my lack of training. I have installed Crestron CHV-TSTAT's, which allow 4 sensors to be connected to one thermostat (including wireless sensors), and right now am regretting my decision to go with Omnistats.

I am waiting to hear from the installer from whom I purchased the kit as to if and when he can visit. Trouble is he is in Hampshire and I am in Suffolk, which doesn't make matters any easier. I see you list a Suffolk and a Colchester based dealer, whom I may contact so see if they will provide support. You know how it is though, "sorry mate, we didn't supply the kit"....

Many thanks once again
Marc

Marc,
No problem. Initially you can have th HAI controller programmed to sturn the heaters on and off by time. You can also manullay turn them on and off via a touchscreen or the HAI iPhone/iPad app. or the new Android app that is coming out soon.

If you decide to add temperature sensors per heating zone you can then also manage the heaters to a temperature. Adjustment to desired temperatre again can be done from a touchscreen or the iPhone/iPad/Android app.

I am interestd in your comments about the Omnistat as I find it very easy to use. The advantage of the Omnistat over the basic temperature sensor is that has an LCD display and it gives you the option to adjust the temperature locally. All you have to do is rotate the knob on the right and you can adjust the desired temperature. If you have aircon you can also set up a temperature you want the aircon to come on at. Additionally you can programme times of the day you want the temperature to be reset, morning, day, evening and night. This internal timer is optional. The other advantage of the Omnistat is the fact that it can drive your relays directly. The downside is that it is more expensive than the simple temperature sensor. If you are happy with only adjusting temperature from a tuchscreen or an app then the temperature sensor is cheaper options. In this case your relays would be wired to outputs on the main controller.

I have spoken to the dealer who has supplied your kit and appartently he is visiting you on Monday. He has successfully implemented heating and hot water control on another project that I know about so he knows what he is doing. He will be able to implement all these options for you.