The Efficient Home Forum

Hi,

I am trying to use following equipment for zone control:
* ATC928G3026 (evotouch) - central unit
* HR92 valve
* T87RF2025 thermostat

The HR92 is placed in the way that makes temperature measurement completely unreliable so I would like to use T87RF in some other place of the same room.

I played with following evohome settings to enable external temperature sensor:
* Heating type: Radiator valve (HR92 paired)
* Temperature sensor: Remote sensor (T87RF paired)

I could achieve one of the results, depending on the pairing order I guess:

1.
* Temperature measurement from T87RF, shown properly in evotouch screen and used for schedule
* T87RF could make manual overwrite of the temperature setting (overriding schedule)
* HR92 does not work (no heat requests, no valve opening)

2.
* Temperature measurement from HR92, also shown in evotouch screen and used for scheduling
* HR92 works OK - opens and requests heat as expected
* T87RF can be only used to manually overwrite set temperature but it's setting is referring to HR92 measured temperature

None of these is what I want

My target scenario is obvously:
* Temperature measurement from T87RF, shown properly in evotouch screen and used for schedule
* T87RF could make manual overwrite of the temperature setting (overriding schedule)
* HR92 requesting the heat and opening accordingly to T87RF measured temperatures and schedule

First of all, is my target sceanrio possible or there are some limitations which I am not aware of ?

Does pairing or configuration order of these devices matter ?

Is there some impact of another option "RF Device Binding (Devices Bound)" available in the zone control on my scenario ?

I would appreciate some hints.

Best,
Sebastian

Does the last paragraph on the Y87 section on the link below help? Almost sounds like your issue,

https://theevohomeshop.co.uk/content/11-evohome-help

I am not completely sure of the issue, but when you bind a 'Radiator Zone' when it asks for you to bind the zone sensor, this is the time you bind the T87RF... The actuator is the HR92. Its all detailed in the evohome Installation Guide.