Themo T700DIN is a DIN-mounted device that can be used for a multitude of different heating systems and electricity consumers. This article focuses on giving you an idea of how to use Themo T700DIN for controlling the heating of your water boiler in PriceSwitch mode. To keep things simple, we will refer to the device in this article simply as ''PriceSwitch''.

What is PriceSwitch?

Themo Price Switch is a product that is designed to shift the electricity consumption of your device (eg. boiler) to the cheapest possible hours of the day. You will get the most benefit out of Price Switch with a SPOT electricity contract, but this is not necessary. 

The main idea is simple, and after installing and configuring the device there are only a few decisions for you to make:

1. How many hours a day should my boiler be able to heat per day?
2. How many hours at most can my boiler be without heating?
3. Is there a maximum price for electricity, above which I am not willing to heat at all?

PriceSwitch takes these parameters into account, and creates the most cost efficient heating schedule for the day. In a nutshell the idea is to take the cheapest hours that fit these parameters, and close the relay to the heater during these hours to enable heating.

Because the final decision to heat the boiler comes from the boiler's own thermostat, it is at this time not possible to follow consumption using PriceSwitch.

IMPORTANT! As Themo T700DIN does not take temperature data into account in PriceSwitch mode, it is extremely important that you DO NOT use it for direct underfloor heating. When used incorrectly, the device may lead to overheating and a fire hazard!

Installation

PriceSwitch is installed on a DIN-rail usually located within a circuit breaker box. Because installation requires coming into contact with 230V wires, installation can only be done by an authorized electrician.

If you want to use Themo T700DIN in PriceSwitch mode, make sure not to add an external temperature sensor to it at installation. Otherwise the device will not allow you to choose PriceSwitch mode.

• Read more how to install Themo DIN device

Some answers to the most frequently asked questions can be found at the end of this article.

Configuration

For configuration, please refer to the following instructions:

• How to connect Themo to Wi-Fi using iOS device?
• How to connect Themo to Wi-Fi using an Android device?

These instructions are made for our wall thermostat, but are perfectly valid for configuring PriceSwitch as well. 

If you encounter difficulties during the configuration process, make sure that your cellular data and VPN are turned OFF for the process. More helpful articles can be found in our knowledge base. If you are not able to solve the issue by yourself, please contact our customer support.

Controlling PriceSwitch

Once you've finished configuring, you'll be able to find the device in the main dashboard of the Themo Mobile App. Using PriceSwitch is easy:

Step 1. Select Power ON hours

• Scroll the control knob to select how many hours per day you want PriceSwitch to be ON. 
  

Step 2. Select Consecutive OFF hours

• Navigate to Device > Settings >  Consecutive OFF max
• Select the maximum hours how long your boiler can be without heating
  

Note! To give Themo the most flexibility in delivering savings, we recommend to set this option to 24h.

Step 3. (Optional) Set the Spot Price Limit 

• Navigate to Device > Settings > Spot Price Limit
• Toggle the price limit on 
• Select the price limit where device switches to off (default value is 150 c/kWh)

Note! It is not recommended to add a spot price limit for PriceSwitch in normal use, as this may lead to a more expensive end-result and may prevent to have no heating at all. Without a spot price limit, PriceSwitch will select the cheapest hours of the day for heating anyway.

Operating modes

Themo PriceSwitch has three operating modes that the user can choose from:

1. ON (relay is always ON)
2. OFF (relay is always OFF)
3. PriceSwitch (relay ON/OFF depending on parameters set by the user and real-time electricity prices)
   

Note! ON and OFF modes are only available from software versions 4.1.55 onwards. In case you have an older version, please contact our customer support.

Physical buttons 

Themo T700DIN has three physical buttons. In PriceSwitch mode, only the MODE button in the middle can be used. The two buttons on the left and right are de-activated.

The mode button can be used to complete three different tasks: 

1. Switch between the three operating modes (ON, OFF and PriceSwitch) 
2. Disable Child Lock (Hold button down for 12 seconds) 
3. Factory reset the device (Go into OFF mode, and then hold the button down for 15 seconds until the screen says ''RESET'')
   

Note! You can not enable Child Lock with the physical buttons. This has to be done via the mobile app.

Symbols

 
The different icons you may see on the device screen are explained here.

PRICE SWITCH

The device is in PriceSwitch mode, and is controlling the relay according to the parameters set by the user and hourly electrical prices.

ON

The device is in ALWAYS ON mode, and the relay to the boiler is always closed (=constant heating)

OFF

The device is in ALWAYS OFF mode, and the relay to the boiler is always open (=no heating)

Lock symbol

Child Lock is enabled.

Letter/paper symbol 

The device has received it's smart schedule from the cloud and it using it to heat the boiler.

Lightning symbol

The relay is in closed position (power on)

Wi-Fi symbol

The device has a working Wi-Fi connection.

Technical Specifications

For Technical Specifications, please refer to the attached ''Themo T700DIN Technical Specifications ENG'' document. 

See also: Recommended contactor for Themo T700DIN