PROTECT AND COMFORT ALGORITHMS FOR A UNIVERSAL WATTIO THERMOSTAT

PROTECT AND COMFORT ALGORITHMS FOR A UNIVERSAL WATTIO THERMOSTAT

The new Thermic update released last week involved two new temperature-control algorithms, Protect and Comfort.  

They are both more than interesting in terms of the way used to achieve the target temperature. But it is not just about that. Thanks to these new usage modes the Thermic is now more universal than ever before.  

The Thermic amplifies its compatibility to any kind of heating control systems. Under the floor radiant heating, pellets heaters… just a Wifi connection and a smart phone are needed to be able to save in the energy bill and control your heating remotely in a simple and comfy way.

With this post we just want to explain the working way of Protect and Comfort modes in detail, in order to let you make the most of it.

 

PROTECT

The aim of this algorithm is to protect your heater. How? Reducing the amount ON/OFFs of the heater in order to make it more suitable for different heating systems.

Thanks to a DIFFERENTIAL algorithm, a hysteresis cycle can be created with upper and lower limits, so that it is not just about the target temperature, but about a wider temperature range, in order to get a balanced comfort.

As shown in the graphic chart, the heater will turn on when the room temperature goes below the lower limit temperature (19ºC) and it will turn off again when reaching the upper limit temperature (21ºC).

This way, the amount of ON/OFFs of the heater are considerably less than with a conventional temperature control algorithm. So, the Protect mode is especially suitable for individual heaters that require a minimum working time.

The example describes the temperature cycle that follows the Differential (PROTECT) algorithm with one degree upper and one degree lower limit. In this case, the heating turns on when the room temperature is below 19ºC and keeps on until the room temperature reaches the 21ºC. It will be off until the room temperature goes below 19ºC.

So, the target temperature is not the reference temperature, but the lower and the upper limit temperatures.

As shown in the Wattio app, when choosing the Protect mode, the values of the limits must always be higher than zero. They can be set up with a 0,1ºC sensitivity. The upper and lower limits don’t have to be the same, especially if the comfort status is a must over or below the target temperature. So if you don't want to go beyond the target temperature, define the lower limit as 0,1ºC. 

It is important to consider the minimum-ON-time requirements of the heater to define the upper and lower limits. It is recommended to reduce them as much as possible (always better a 0,8ºC than 1ºC to respect the comfot), always respecting the heater’s requirements, to warranty an optimum balance between the home comfort and the heater protection.

Of course, the higher the limits, the lower the ON/OFF switch frequency, as well as the higher the variability of the room temperature.

Below you can see the historic day chart of a Thermic that uses the Protect mode. It is recognizable the real effect in the room temperature and specially the low amount of ON/OFFs if we compare it with the conventional mode.

COMFORT

With the Comfort mode, the room temperature will be really close to the target temperature. So the comfort level achieved with this Proportional algorithm is considerably higher and the temperature will increase in stability.

A Proportional algorithm is the base of the Comfort mode in terms of temperature control and it is defined using three parameters: the temperature range, the temperature reading period and the time Delta that divides the Period.

The Thermic will capture the room temperature in the end of each period and regarding that captured temperature, the algorithm will define how many minutes will be the heater on during the following period, keeping the temperature stable and close to the target temperature.

The following example shows the performance of the Proportional algorithm:

The temperature range will be 2ºC (1ºC upper limit and 1ºC lower limit), the period will be 10 minutes and the Delta will be 1 minute. These are the particular values in the Comfort mode when choosing it on the Wattio app.

Additionally, in this example, the target temperature is 20ºC.

 

                 


The table shows how many minutes is the heater on during the oncoming period, according to the captured temperature. 

The room temperature is captured in the end of each period. According to the captured temperature, the heater will turn on for X minutes during the following period.

In this example, the first temperature reading is below 19,2ºC, so the heater will be on during the entire period that follows. In the second reading, the captured temperature value is 20,5ºC, so on the oncoming period, the heater will be on for 3 minutes and off for the last 7ºC.

So, even though the room temperature is over the target one, the heater can turn on when starting a new period.

 

 

 

In order to preserve the comfort status, it is possible that the frequency of ON/OFFs of the heater increases. So, it is a must to be conscious about the requirements of the heater, especially if it demands a minimum working time.  

El modo Comfort está indicado para todos aquellos sistemas de climatización que no tengan establecido un tiempo mínimo de funcionamiento y lo recomendamos especialmente para sistemas de calefacción central con control de válvulas individual.

The Comfort mode is particularly recommended for non-minimum performance time required heating systems, such as central heating with valve empowered individual control systems.

The following historic chart shows the performance of a Thermic using the Comfort mode. It is recognizable the way that the temperature stabilizes getting closer to the target temperature. Compared to the Protect mode, it is also remarkable the frequency of ON/OFFs of the heater.

The Thermic is now more suitable for different heating systems thanks to these two performance modes. Whatever your heater system is, the Wattio smart thermostat will always an excellent option to control your heating from anywhere and save in the energy bill thanks to a more sustainable and efficient consumption.