The first step in configuring the Evohome system is to bind/pair each of the system components to the Controller. Each component has a slightly different procedure for binding, giving the impression that different teams developed different components for the system. For example, the HR92 TRVs require a 5 second push on their button to get them into configuration mode, then select Bind from the 3 options, and off you go. The BDR91 wireless relays however need a 15 second push on their button to clear the previous binding data, then another 5 second push to get the binding process going. The supplied installation manual explains the binding procedure pretty well. On the plus side, the Controller is battery powered so you can carry it around the house, binding it to each component in turn.
As mentioned before, the Evotouch evolved into the Evohome Controller. Be aware that in the Controller software the Controller is still referred to as an Evotouch. One mistake we made whilst initially configuring the system is to set the Controller as a temperature sensor for the living room, rather than use the temperature sensor built into the HR92 TRV. Not referring to it as the Evohome Controller might have contributed to our confusion.
We also had a little trouble setting up the hot water part of the system. The first stumble was the use of the word Actuator, which seems to be used synonymously for both the BDR91 wireless relay and the mid-position valve. We were also prompted to rebind the BDR91 wireless relay for the central heating at one point during setting up the hot water, but in the end we appear to have everything bound and operational.
We wanted to set the temperature for the hot water tank to 55C, to be below 60C at which limescale deposits start increasing, and also above 50C to combat bacterial collonies such as Legionella. Setting the temperature for hot water is straight forward using the Controller. However two other options are also presented, Overrun and Differential, but the explanations of these options are omitted from the supplied manuals. However, the Evotouch manual (doc ref 50056315-001 B) has the following:
Hot Water Overrun
Specifies how long the valve for the hot water is open or the hot water pump is running to extract all the heat to avoid blocking the heat source.
Hot Water Differential
Setting the switching differential of the domestic hot water control.
So, by setting the Differential parameter to 5C, the hot water should stay in the 50C to 60C range. We also put in a 1 minute Overrun, which I think will keep the Grundfos pump running for a minute after the boiler has been shut down.
Other parameters that we tweaked were to do with Optimisation (Optimum Start, where the system learns when to fire the boiler up in advance to hit the temperature requested) and Fail Safe (where the system will run at a 25% duty cycle if the Controller comms fail completely).
I'm pretty sure we'll get into more of the configuration parameters that the system offers as we get used to the way it works. And then, of course, there's the whole scheduling aspect we'll start playing with.
As mentioned before, the Evotouch evolved into the Evohome Controller. Be aware that in the Controller software the Controller is still referred to as an Evotouch. One mistake we made whilst initially configuring the system is to set the Controller as a temperature sensor for the living room, rather than use the temperature sensor built into the HR92 TRV. Not referring to it as the Evohome Controller might have contributed to our confusion.
We also had a little trouble setting up the hot water part of the system. The first stumble was the use of the word Actuator, which seems to be used synonymously for both the BDR91 wireless relay and the mid-position valve. We were also prompted to rebind the BDR91 wireless relay for the central heating at one point during setting up the hot water, but in the end we appear to have everything bound and operational.
We wanted to set the temperature for the hot water tank to 55C, to be below 60C at which limescale deposits start increasing, and also above 50C to combat bacterial collonies such as Legionella. Setting the temperature for hot water is straight forward using the Controller. However two other options are also presented, Overrun and Differential, but the explanations of these options are omitted from the supplied manuals. However, the Evotouch manual (doc ref 50056315-001 B) has the following:
Hot Water Overrun
Specifies how long the valve for the hot water is open or the hot water pump is running to extract all the heat to avoid blocking the heat source.
Hot Water Differential
Setting the switching differential of the domestic hot water control.
So, by setting the Differential parameter to 5C, the hot water should stay in the 50C to 60C range. We also put in a 1 minute Overrun, which I think will keep the Grundfos pump running for a minute after the boiler has been shut down.
Other parameters that we tweaked were to do with Optimisation (Optimum Start, where the system learns when to fire the boiler up in advance to hit the temperature requested) and Fail Safe (where the system will run at a 25% duty cycle if the Controller comms fail completely).
I'm pretty sure we'll get into more of the configuration parameters that the system offers as we get used to the way it works. And then, of course, there's the whole scheduling aspect we'll start playing with.
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