Danfoss Z-Wave TRV - HELP PLEASE
I'm hoping someone can help me here. I have sold a Zipato soluiton to a client and we are successfully controlling a number of things such as blinds, AC, lighting etc, and we are also trying to setup a multi-zone heating scheme in the house.
We have a number of the Danfoss TRV's and we have managed to figure out how to setup multiple TRV's as virtual thermostats. The relay from the Zipatile (Relay 1) is the boiler enable signal and swtiches the boiler on/off, and therefore we have selected Relay 1 in the device configuration options as below...
So, when I adjust the temperature setting on the TRV, or via the Zipato app, to a value higher than the current temperature value I can hear the relay click and the boiler fires. Thr problem however is that we have no way of reading thde temperature from the TRV, and as far as I can tell we will need to use an external termperature sensing device/thermometer to provide the current temperature value in the room and then compare this to our setting.
However, this raises a big concern in my mind. The TRV is designed to open and close the radiator valve based on it's own temperature reading compared to it's own temperature setting. As with any zoned heating system like this, if one radiator TRV requires heating it will open the radiator valve and a signal will be sent to fire up the boiler. If we are unable to use the temperature reading from the TRV within the Zipato how can we know when to start the boiler?
If we use an external temperature sensor we could have the following situations occur as described below:
Scenario 1
Danfoss TRV temperature reading - 19DegC
Danfoss TRV temperature setting - 22DegC
External device temperature reading - 22DegC
In this scenario the Danfoss TRV will open the radiator valve but the boiler will not fire.
Scenario 2
Danfoss TRV temperature reading - 22DegC
Danfoss TRV temperature setting - 22DegC
External device temperature reading - 19DegC
In this scenario the Danfoss TRV will close the radiator valve but the boiler will be on wasting energy and the client will want to know why the temperature is showing as 19DegC and they have the setting at 22DegC but the radiator isn't getting hot.
Unless I am missing something this is surely a major problem and can lead to big issues and confusion over the heating control in the property.
Please can somebody explain how the boiler enable signal from the Zipato system can be properly tied in with the Danfoss TRV's so that if one of them opens a valve the boiler also enables.
Thank you.
The same question
Hi Christopher
Yes I see your problem as I had a similar one...my solution was to create a rule for each virtual thermostat combined with an external temperatur sensor. Using the rule you will know exactly when the heating should be on in a room or off. This could then trigger your boiler to turn on or off.
I hope this makes sense to you?
Regards
Beat
Hi Christopher
Yes I see your problem as I had a similar one...my solution was to create a rule for each virtual thermostat combined with an external temperatur sensor. Using the rule you will know exactly when the heating should be on in a room or off. This could then trigger your boiler to turn on or off.
I hope this makes sense to you?
Regards
Beat
Hello Christopher,
I believe you are missing the Valve into Output... See this post on how to configure the virtual thermostat, maybe it is helpful: https://community.zipato.com/topic/help-with-the-set-up-of-a-virtual-thermostat-with-2-radiators-valves. As you can see valves must me into the Ouput field for sure. Output is compulsory. Input is optional if you wish manual income on a certain valve is reflected and respected by the controller.
Regarding the reading of the temperature of the Danfoss, please check this post regarding multiroom heating and Danfoss valves: https://community.zipato.com/topic/honeywell-evohome-vs-danfosspopp-zwave-on-multiroom-heating. In this case you may need and additional device for temperature measurement.
Hope this helps!
Hello Christopher,
I believe you are missing the Valve into Output... See this post on how to configure the virtual thermostat, maybe it is helpful: https://community.zipato.com/topic/help-with-the-set-up-of-a-virtual-thermostat-with-2-radiators-valves. As you can see valves must me into the Ouput field for sure. Output is compulsory. Input is optional if you wish manual income on a certain valve is reflected and respected by the controller.
Regarding the reading of the temperature of the Danfoss, please check this post regarding multiroom heating and Danfoss valves: https://community.zipato.com/topic/honeywell-evohome-vs-danfosspopp-zwave-on-multiroom-heating. In this case you may need and additional device for temperature measurement.
Hope this helps!
Hi Christopher,
I have done this on my system, but you need the Popp TRV to be able to get the Valves temperature reading. Its the same valve as Danfoss, but Popp has the additional functionality. Using the Popp valves you can do exactly what you are looking for with no other devices.
The issue that potential temperture difference between the valve and the sensor due to them being in different locaitons. You compensate for this by configuring an ofset on your temperature sensor so that the readings are closer to each other which will ease the issue.
However, the Danfoss valve is really designed to be a programable replacement of a standard valve which can be set to different tempertures at different times to suit the client. But the boiler control to remain on a timer or a central thermostat, which you could do using your external temperature sensor.
Hope this helps
Hi Christopher,
I have done this on my system, but you need the Popp TRV to be able to get the Valves temperature reading. Its the same valve as Danfoss, but Popp has the additional functionality. Using the Popp valves you can do exactly what you are looking for with no other devices.
The issue that potential temperture difference between the valve and the sensor due to them being in different locaitons. You compensate for this by configuring an ofset on your temperature sensor so that the readings are closer to each other which will ease the issue.
However, the Danfoss valve is really designed to be a programable replacement of a standard valve which can be set to different tempertures at different times to suit the client. But the boiler control to remain on a timer or a central thermostat, which you could do using your external temperature sensor.
Hope this helps
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