Is it possible to use an Aqara RTV E1 thermostat in combination with versatile thermostat with a heater switch?

[vrucht]

Hi all,
I am a newby on Home Assistant and starting to learn the hang of it. I am not a coder so i am mostly dependent on info i get from this community. Please bare with me if i ask stupid questions or don’t exaclty know what the anwer is.

I have the following setup:

Home Assistant (latest version) with an Sonoff Zigbee stick over Z2MQTT.
A smart zigbee Thermostat Aqara E1
A central heater with an on/off switch
Use of versatile Thermostat with Window Sensor
A 4 channel zigbee switch (For every room one switch for easy coding) for our central heating
I want the following:

I have two Rooms that i want to heat independently
Every Room has a Aqara E1 thermostat that must be used to set the target temperature on the thermostat itself because the kids don’t have access to HA
Use the Algorithm of versatil thermostat to control my heater and door/window sensors.
If there is no demand for heat in a room, the thermostat must be closed by setting the target temp on the Aqara.
The issue that i am experiencing is, that i can’t make the setup to work in this configuration. The temperature set on the device, must be somehow copied to the verstatile target temperature, so that the versatil thermostat can activate the heater switch.
The other way arround should also work: When setting the target temp on versatile thermostat, the value must be set on the Aqara smart thermostat so the Aqare can close the valve in the radiator if there is no demand for heat. With this mechanism, i can control the heating of the rooms centrally and through automations.

I see that the attribute that i need in Z2mqtt is: “Ïnternal_heating_setpoint”

{
“away_preset_temperature”: “5.0”,
“battery”: 100,
“calibrated”: true,
“child_lock”: “UNLOCK”,
“device_temperature”: 23,
“internal_heating_setpoint”: 29,
“linkquality”: 54,
“local_temperature”: 21.5,
“occupied_heating_setpoint”: 29,
“power_outage_count”: 1,
“preset”: “manual”,
“schedule”: “OFF”,
“schedule_settings”: “mon,sun|0:00,21.0|12:00,17.0|18:00,21.0|23:59,21.0”,
“sensor”: “internal”,
“setup”: false,
“system_mode”: “heat”,
“valve_alarm”: false,
“valve_detection”: “OFF”,
“window_detection”: “OFF”,
“window_open”: false
}

This attribute should somehow be copied to the temperature attribute in versatile thermostat, but that attribute is not available in MQTT, HA and automations. I tried several pieces of code, but this is where my lack of knowledge comes in.
I hope that you all understand what i want, and can help me to get on track.

[jmcollin78]

Hello @vrucht ,

The temperature set on the device, must be somehow copied to the verstatile target temperature, so that the versatil thermostat can activate the heater switch.

This is exactly what does an over_climate VTherm. You don't put the attributes of the VTherm so I can't tell what is wrong but his should work.

When setting the target temp on versatile thermostat, the value must be set on the Aqara smart thermostat

This is also the behaviour of VTherm.

Please post your VTherm attributes so that I will be able to check if something is wrong (Development Tools / states / click on your VTherm / copy-paste the attributes with the code settings (button <> in the edit box).

EDIT: sorry I thinlk I don'y understand clearly you original post. The VTHerm is control the central switch and not the Aqara TRV itself. Is that true ? If yes with this setting nobody is controling the TRV. You should have a VTherm for each Aqara TRV you want to control and another mecanism to pilot the central heating switch. You can for example, have an automation that turn on the central heater when one the VTherm is heating. This can be done by checking the hvac_action of the VTherm (if 'heating', you turn on the central heater switch).

[jmcollin78]

Maybe instead of turn on and off depending of temperature you can turn on and off depending of what VTherm is ordering to the underlying climate.

If vtherm.hvac_action is "heating" then turn on you central switch and vice versa. I think it is more stable and will avoid too much start / stop. But you have to try, i don't have many experience on this.

[vrucht]

vtherm.hvac_action
This parameter isn't changing in any mode
hvac_action: null
Is it possible to fix this or add an extra attribute to the Vtherm that i can use?
Update: Cause the code below is kinda bold

In the mean time i managed to change the compare between the two temperatures that the minimal difference should be 0.5 degrees.

alias: New automation
description: ""
trigger:
  - platform: state
    entity_id: >-
      climate.bram_slimme_thermostaat_aqara,
      sensor.bram_thermo_hygrometer_temperature
condition: []
action:
  - choose:
      - conditions:
          - condition: template
            value_template: >
              {{ (state_attr('climate.bram_slimme_thermostaat_aqara',
              'temperature') | float -
              states('sensor.bram_thermo_hygrometer_temperature') | float) > 0.5
              }}
        sequence:
          - service: switch.turn_on
            target:
              entity_id: switch.planken_lamp
            data: {}
        alias: "Call a service 'Switch: Turn on' on Planken lamp"
      - conditions:
          - condition: template
            value_template: >
              {{ (states('sensor.bram_thermo_hygrometer_temperature') | float -
              state_attr('climate.bram_slimme_thermostaat_aqara', 'temperature')
              | float) > 0.5 or
              (states('sensor.bram_thermo_hygrometer_temperature') | float -
              state_attr('climate.bram_slimme_thermostaat_aqara', 'temperature')
              | float) < -0.5 }}
        sequence:
          - service: switch.turn_off
            target:
              entity_id: switch.planken_lamp
            data: {}
        alias: "Call a service 'Switch: Turn off' on Planken lamp"
mode: single

[jmcollin78]

Is it possible to fix this or add an extra attribute to the Vtherm that i can use?

No. VTHerm don't do anything in over_climate mode. It just send the target temp and the hvac_mode (on/off) to the underlying. Without hvac_action I don't see any other solution on VTherm side. Maybe an automation listening to the state of the underlying as you have in solution 1 but with a delay (stop when underlying stops for 5 min, and start immediatly).

I am very disappointed from Aqara TRV ...

In the first post there was a “system_mode”: “heat”, is that not what you are looking for ? A kind of hvac_action ?

[vrucht]

Ok then climate mode isn't going to work for this situation. Also the open window detection doesn't work.

Then the switch mode is the only way this could work. But for that i need to copy the set temperatures from VTherm to RTV and the other way arround. right?
Could you help me with that? we have all the attribute in this post.

Do you prefere an other RTV? i can still send them back to the store and order an other type. But then i have to know what to look for.

“system_mode”: “heat” is nothing else than "on"meaning, the RTV is somewhere between 1 and 30 degrees. useless

[jmcollin78]

We have a bug on open window detection with some environment. I'm on it this week normally

Do you prefere an other RTV? i can still send them back to the store and order an other type. But then i have to know what to look for.

The best compatible TRV I see are the Shelly TRV which we can control directly the open percent of the valve. Then you can use VTherm in over_valve mode and it is full featured: https://www.shellyfrance.fr/shelly-trv/?utm_source=Google%20Shopping&utm_campaign=google%20feed&utm_medium=cpc&utm_term=54400&gad_source=1&gclid=Cj0KCQiA6vaqBhCbARIsACF9M6k31dqL-wrDF2-uuR_DwepMsAu5Rpij3F0ski9EttMlfy7fPzHm_q8aAshvEALw_wcB

You have this in the README