COMPUTHERM E400RF

Wi-Fi thermostat with a wireless touch button controller

 

The COMPUTHERM E400RF is a wireless Wi-Fi thermostat with touch buttons. It can be used to control the device (e.g. boiler) connected to it either remotely through the internet, or locally through its touch buttons. It can be easily connected to any gas boiler having a two-wire thermostat connection point and to any air conditioning apparatus or electrical apparatus, regardless of whether they have a 24 V or 230 V control circuit.

This product is an ideal choice to everyone as with its favourable price and its state-of-the-art technology it reduces energy costs while maintaining comfort. With the help of this product you will be able to control the heating of your flat, house or holiday home anytime, from anywhere.
It is especially useful if:

  • you are not using your flat or house based on a regular schedule,
  • you are travelling away from you home for an indefinite time during the heating season, 
  • you would like to use you holiday home during the heating season.

The device consists of two units. One is the thermostat (transmitter unit), the other is the receiver unit that controls the boiler. There is a wireless (radio frequency) connection between the two units, so there is no need to build a wire between the thermostat and the boiler.

The simultaneous use of several COMPUTHERM room thermostats and one COMPUTHERM Q4Z zone controller provides the possibility for the thermostats to also control a pump or a zone valve in addition to starting the heater or cooler. This way it is easy to divide a heating / cooling system into zones, thanks to which the heating / cooling of each room can be controlled separately, thus greatly increasing comfort. Furthermore, the zoning of the heating / cooling system will greatly contribute to the reduction of energy costs, as due to this only those rooms will be heated / cooled at any time where it is required.

Technical data:

Technical data of thermostat:

  • Adjustable temperature range: 5 °C to 99 °C (in 0.5 °C increments)
  • Temperature measurement range: 0 °C to 50 °C (in 0.1 °C increments)
  • Temperature measurement accuracy: ±0.5 °C (at 25 °C)
  • Type of thermostat sensor: NTC 3950 10 kΩ 25 °C-on
  • Selectable switching sensitivity: ±0.1 °C to ±1.0 °C (in 0.1 °C increments)
  • Thermometer calibration range: ±5.0 °C (in 0.1 °C increments)
  • Supply voltage: USB-C 5 V DC, 1 A
  • Operating frequency: RF 433 MHz, Wi-Fi (b/g/n) 2.4 GHz
  • Transmission distance of the RF communication: approx. 250 m in open terrain

Technical data of receiver unit:

  • Supply voltage of the receiver unit: 230 V AC; 50 Hz
  • Switchable voltage: max. 24 V DC / 250 V AC
  • Switchable current: 3 A (1 A inductive load)
Computherm - Wi-fi termosztátok -  COMPUTHERM E400RF - Quantrax Kft.
Computherm - Wi-fi termosztátok -  COMPUTHERM E400RF - Quantrax Kft.

Download the most important documents related to the product

FAQ: 
What purpose can the COMPUTHERM E400RF Wi-Fi thermostat be used for?

The COMPUTHERM E400RF Wi-Fi room thermostat has been specifically designed to control heating and cooling systems. The thermostat connects your smart phone or tablet to the device to be controlled remotely.  With the help of E400RF you can set the temperature of your home hour by hour, and you can set and control it via the Internet.

Turning  on  and  off  the  controlled  appliance  allows  you  to  maintain  constant  comfortable temperature without suffering any unnecessary energy losses. This product is especially useful when you do not use your flat or house according to a predefined schedule, you leave your home for an uncertain period of time during the heating season or you intend to use your holiday home during the heating season as well.

The appliance can be easily controlled via the Internet or by using a touch screen interface, and its operating conditions can be inspected continuously. The thermostat is particularly suitable for controlling underfloor heating systems, thanks to the connectable floor temperature sensor. The thermostat has two potential free relays which are switching at the same time therefore two completely independent devices can be controlled, and a heating system can be divided into zones without a separate zone controller.

In addition, the thermostat is also suitable for controlling electrical and electronic devices which can be turned on and off by interrupting and resuming power supply.

How E400RF will reduce the total amount of your bill?

With E400RF you can set your desired temperature for every hour of the day and night. This way the temperature in your home always meets your requirement. It provides comfort without consuming energy unnecessarily. It always consumes as much energy as needed and you can save up to 30 percent of your heating costs. In addition, remote control can also save energy for you because this way you can remotely turn off the device to be controlled when you are away then turn it on later.

What type of appliances can be controlled by COMPUTHERM E400RF?

COMPUTHERM E400RF type switching-mode room thermostat is able to control vast majority of the boilers and air-conditioning equipment available on the Hungarian market. It can be easily connected to any gas boiler having a two-wire thermostat connection point and to any air conditioning apparatus or electrical apparatus, regardless of whether they have a 24 V or 230 V control circuit.

Can E400RF be used for air-conditioning equipment?

The E400RF thermostat can also be used to control an air-conditioner.

For products purchased before December 2020: For controlling a cooling system the controlled cooling device should be connected in a way that differs from the method employed for the heating mode, according to the Instruction Manual.

For products purchased after December 2020: If cooling is controlled, the thermostat must be switched to cooling mode in the application or using the thermostat's touch buttons. In this case, it is not necessary to change the connection.

Can E400RF be used to control a heating system only?

No, the appliance is able to control air-conditioning equipment and any other device which can be operated only by its ON/OFF function.

For products purchased before December 2020: For controlling a cooling system the controlled cooling device should be connected in a way that differs from the method employed for the heating mode, according to the Instruction Manual.

For products purchased after December 2020: If cooling is controlled, the thermostat must be switched to cooling mode in the application or using the thermostat's touch buttons. In this case, it is not necessary to change the connection.

What type of battery / mains supply is required for the operation of E400RF?

To operate the central unit with touch buttons, a voltage of 5 V DC is required, which can be provided by connecting the mains adapter and cable included in the basic package of the device to a 230 V mains power supply. The receiver unit operates directly from a 230 V mains supply. No battery is required to operate the device.

Where can you buy it?

Search  this  product  at  our  reseller  partners.  The  list  of  our  reseller  partner  is  available  at  the following link: Partners.

Where you can find the Instruction Manual of the appliance?

Installing and operating instructions for the E400RF thermostat are available at the following website: Instruction Manual

From where can you download mobile application of E400RF?

If you use an Android operating system you can download the application from Google Play Store. If you use iOS operating system you can download the application from iTunes Store. The name of the application is COMPUTHERM E Series.

How many E400RF appliances can be controlled from a single telephone?

The number of the appliances is unlimited. Every commissioned E400RF appliance can be added to your phone application and can be controlled from your phone.

Will several E400RF thermostats used in the same flat disturb each other’s operation?

No. Each thermostat is connected to the local Wi-Fi network separately and this solution guarantees reliable and trouble-free operation of the appliances.

Is it absolutely necessary to have a Wi-Fi connection with Internet access for using E400RF?

The appliance is able to operate with full functionality even without having a Wi-Fi connection with Internet access by means of the touch keys of the thermostat, but the thermostat can be controlled remotely only if it is connected to a Wi-Fi connection with Internet access.

How can you connect the appliance?

For   more   detailed   information   please   refer   to   the   Instruction   Manual   of   the   appliance (Instruction Manual).

Where to locate centraling and receiving units of the thermostat?

It is expedient to locate the thermostat in a room where you stay regularly or a long period of time so that the thermostat is oriented in the direction of the natural ventilation of the room but is not exposed to draught or extreme heat (e.g. sunlight, refrigerator, chimney, etc.). Its optimal location is at a height of 0.75-1.5 m from the floor level.

The receiver of the Computherm E400RF thermostat should be installed near the boiler, in a place protected from moisture, dust, chemicals and heat. When selecting the location of the receiver, also take it into account that the propagation of radio waves is caused by large metal objects (eg boilers, buffer tanks, etc.) or metal building structures may be adversely affected. If possible, we recommend to install the receiver at a distance of at least 1-2 m from the boiler and other large metal structures, at a height of 1.5-2 m, to ensure interference-free radio frequency communication. We recommend to check the reliability of the radio frequency connection at the selected location before installing the receiver. Do not install the receiving unit beneath the cover of the boiler or in the immediate vicinity of hot pipes or pumps because this may cause damage to the parts of the appliance and compromise the wireless (RF) connection. We also recommend that the power is preferably supplied to the receiving unit from a socket other than that of the boiler (and from another phase, if it is possible), and line power must not be supplied to the receiving unit from the boiler on any account. To prevent electric shock ask a professional to connect the receiving unit to the boiler.

Can temperature sensors be connected to E400RF appliance?

No, it is not possible to connect an additional temperature sensor to the device.

What should I do when the appliance switches but 230 V mains voltage does not appear at its output?

The appliance has potential free (voltage free) output connection points therefore 230 V voltage normally does not appear at its outputs, it only links the two connected wires or disrupts the connection between them. If you want 230 V voltage to appear at the output of the appliance when it is switched off then you have to connect a mains phase wire to one of the connection points according to the Instruction Manual. Before connection the phase wire must be de-energized and the connection must be carried out by a competent person.

What should I do if I am of the opinion that the thermometer of the thermostat measures inaccurately?

Temperatures measured by the appliance can be calibrated and the modified temperature values appear on the display. Calibration of measured temperatures can be carried out according to Chapter 11.2. of the Instruction Manual.

What should you do if the signal of your Wi-Fi router is weak and thus E400RF is outside the range of the router?

If it is possible, put the router closer to your E400RF appliance. Another option is to place a Wi-Fi signal booster between the router and E400RF to extend the range of the router.

What should you do if can not conncect the thermostat to the Wi-Fi network?

Download and read the document with our suggestions for Wi-Fi network connection.

What should you do if you encounter a problem related to the Wi-Fi network?

If the appliance cannot be controlled via the Internet because the application indicates that the appliance is inaccessible and does not respond to the modifications then the connection between the appliance and the web interface has been interrupted. This situation may be due to several reasons. The problem is most probably caused by the Wi-Fi router being used. It is expedient to restart the routers from time to time by interrupting and restoring power supply. In most of the cases this type of problems is solved by restarting the router. If the appliance is still inaccessible at the front end after a few minutes have elapsed then it is recommended that the appliance is reconnected to the Wi-Fi network according to Chapter 8.2. of the Instruction Manual. If the connection is successful but the appliance is still inaccessible then it is recommended that the router is set to factory default, because it may occur that the device cannot be connected to the Internet because of some settings. While the thermostat is inaccessible via the Internet you can control it manually with the touch keys of the thermostat.

How does this product continue to function after a power outage?

The appliance does not work without power supply but it can memorize the settings. If the power supply  is  disturbed  (power  outage),  it  is  able  to  continue  to  function  without  any  external intervention after the power supply is restored, if this option is chosen among settings (see Chapter 11.4. of the Instruction Manual).

How is default setting of the appliance restored (reset)?

All settings of the thermostat, except for date and time, are set back to the factory default settings according to Chapter 11.6. of the Instruction Manual.