W100 with a T2 for wireless room climate control - radiant system

[Rhody]

I am just starting this endeavor and trying to replace my existing proprietary control system without pulling wires…

I use a hydronic radiant based system for heating and cooling and each room has a thermostat and one or more valves on a manifold, depending on its size. There are 3 different pumps with mixing valves adjusting the temp of the liquid moving through each respective manifold. The pumps and mixing valves are colocated while the manifolds are spread out.

The ideal state is to open/close a given room’s valve actuator(2-wire 24VDC), start/stop the relevant pump(2 wire dry contact) and adjust the mixing valve setting(2-10vdc) so outgoing water is above dew point.

Starting basic, since humidity is not an issue yet. Just trying to configure a W100 and having the setpoints from that engage a T2 to energize the manfiold actuator.

I believe the diagram below is the correct one, for the dry contact of the T2, substituting line power for 24vdc. L1 and LOut are connectedto the 2 wire actuator. Do I have that correct? The actuator is polarity indifferent, probably not the right word choice. There is not a manual switch, although in the future I might add a toggle at the manifold simply to support maintenance.

If I get this working, the pump activation is a rinse and repeat as is the powering of a dehumidifer/humidifer as the project evolves.

The dewpoint mixing vavle control is going to be the beast of it all, but at least it is formulaic automation…

EDIT to add a question:
Forgot to add a question about leveraging a multi-zone valve controller, akin to a Taco ZVC40x-5 or Tekmar 30xV(x being the number of zones), as it will energize the pump for the manifold and also activate air-side things without having to add automation complexity to the system.

Since those will power a thermostat with 24VDC, is there a way to wire the T2 to power steal from the controller? Wiring L and L1 with jumper between N and L2 or something like that?

Thanks in advance for the help.

[gafich10]

Hello, the T2 relay will suit you perfectly. The supply voltage of the T2 relay is exactly 24 volts.
Just keep in mind that W100 is a thermometer. The T2 relay will only be controlled through the automations created for W100 and T2.

[Rhody]

Thanks for the response.

There are setpoints for use in the automations, correct? I did see a few threads where it described the functionality as a little wonky due to lack of variables in automations.

Any thoughts on the wiring for power stealing to/from a multi zone controller?

[gafich10]

@Rhody

There are setpoints for use in the automations, correct? I did see a few threads where it described the functionality as a little wonky due to lack of variables in automations.

You will have to change the temperature in the automation. It is possible to control the temperature by time in one automation, I have it. That is why I emphasized that the W100 is a thermometer.

@Rhody

Any thoughts on the wiring for power stealing to/from a multi zone controller?

Theoretically, you can use 24 volts only to power relay T2. Make dry contacts that will switch your circuit.
ATTENTION, when powered by 24 volts, relay T2 is not switched by contacts S1, S2, COM.

[Rhody]

@gafich10

You will have to change the temperature in the automation. It is possible to control the temperature by time in one automation, I have it. That is why I emphasized that the W100 is a thermometer.

Can I use the button presses, double press +/-, to execute an automation that increases decreases the temperature in the automations?

Could you share the the time based automation you wrote?

Thanks again.

[gafich10]

@Rhody

an I use the button presses, double press +/-, to execute an automation that increases decreases the temperature in the automations?

No ,

@Rhody

Could you share the the time based automation you wrote?

Automation 2.0, lesson 11, creating the simplest automation for heating devices

Lesson10 Automation 2.0, lesson 10, room climate control. Creating a smart heating schedule for radiator thermostats (E1, W500, W600) - #4 by gafich10 Good afternoon, today I want to conduct training on creating automation for controlling the temperature in the room. Introduction. I want to start the lesson by explaining the types of heating systems in houses. Such an explanation is needed to distinguish automation in relation to the types of heating. “A” - a type of heating that works centr…

[nzjrs]

@Rhody

Can I use the button presses, double press +/-, to execute an automation that increases decreases the temperature in the automations?

No, it’s rediculous. I guess you saw my posts on this topic. Now you have discovered the same thing as me.

You should email Aqara support and ask

1. to add any sort of setpoint based state in the W100 to allow it to be used as a standalone thermostat
2. to add support variables in automations

Either of these would allow using the W100 as a standalone thermostat as you (and I) want.

[Rhody]

@nzjrs

No, it’s rediculous. I guess you saw my posts on this topic. Now you have discovered the same thing as me.

You should email Aqara support and ask

1. to add any sort of setpoint based state in the W100 to allow it to be used as a standalone thermostat
2. to add support variables in automations

Either of these would allow using the W100 as a standalone thermostat as you (and I) want.

I’m hoping that I can do something combined with Homey for the variablization that I need and maybe its scripting will allow me to leverage hidden attributes from the W100.

It is a journey, just hoping I like walk