Quantrax Computherm E Series User manual

Operating instructions
COMPUTHERM E280FC
programmable digital Wi-Fi fan coil
thermostat for 2- and 4-pipe systems
COMPUTHERM E Series

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TABLE OF CONTENTS
1. A general description of the thermostat 5
2. Important warnings and safety recommendations 6
3. Information appearing on the display of the thermostat 9
4. Functions accessible in the phone application 10
5. Location of the thermostat 11
6. Connection and installation of the thermostat 11
6.1. Connection of the device(s) to be controlled 12
6.2. Connection to the electrical network 13
6.3. Mounting the thermostat 13
7. Internet control setup 14
7.1. Installing the application 14
7.2. Connecting the thermostat to a Wi-Fi network 15
7.3. Connecting the thermostat to a user account 17
7.4. Controlling the thermostat by multiple users 17
8. The basic operation of the hermostat 19
9. Basic settings 20
9.1. Renaming the thermostat assigned to the application 20
9.2. Disabling further connections of the thermostat
assigned to the application 20
9.3. Deleting the thermostat assigned to the application 21
9.4. Setting the day and time 21
9.5. Locking operating buttons 22

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10. Operation-related settings 23
10.1. Selecting the temperature sensor (DIF) 26
10.2. Calibration of the temperature sensor (ADJ) 26
10.3. Antifreezing (FRE) 27
10.4. Memorizing settings in the event of a power failure (PON) 27
10.5. Switching between heating, cooling and ventilation modes (FUN) 28
10.6. Fan tempereture based control (FAN) 28
10.7. Programmable fan speed (PFS) 29
10.8 Selecting heating/cooling system type (SYS) 29
10.9. Restoring default setting (FAC) 30
11. Switching between ON and OFF positions 31
11.1. Manual mode 32
11.2. Programmed auto mode 33
11.2.1 Description of the programmed mode 33
11.2.2. Description of the steps of programming 34
11.2.3. Program change until the next switch in the program 37
12. Practical advices 38
13. Technical data 40

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1. A GENERAL DESCRIPTION OF THE
THERMOSTAT
The COMPUTHERM E280FC Wi-Fi fan coil thermostat is a device
that can be operated by a smartphone or tablet via Internet, and
especially recommended for controlling fan coil heating or cooling
systems. It can be easily connected to any 230 V operational fan coil
devices with three fan speed, and valve adjusters opening and closing
the valves.
The device can be easily controlled via both Internet and touch button
interface, and its operating conditions can be checked continuously.
The device also allows automatic control on the basis of temperatures
and times. Several thermostats that are put into operation at di󰀨erent
locations can be registered to the same account and controlled. The
thermostat has three output serves three fan control and two serves
valve adjuster controls. When switched on, one of the fan outputs
display the power grid phase and on the valve outputs 230 V voltage
is displayed.
With this product your apartment, house or holiday home heating /
cooling system can be controlled anytime and from anywhere. This
product is especially useful when you do not use your at or house
according to a predened schedule, you leave your home for an
uncertain period of time during the hating season or you intend to use

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your holiday home during the heating season as well.
The two parallel operating relays incorporated into the device simply
ensure that the thermostat also opens/closes the valve of the heating/
cooling pipeline and controlls the fan coil fan. (gure 3)
2. IMPORTANT WARNINGS AND SAFETY
RECOMMENDATIONS
•Before starting to use the device, please study carefully and
follow strictly the instructions.
• The thermostat was designed for business or household
(not industrial) use, and can be used to control any electric
device while keeping in mind the maximum output load of
the thermostat.
• Before starting to use the thermostat, make sure that the
Wi-Fi network is reliably accessible at the place where you
intend to use the apparatus.
• This device has been designed for indoor use. Do not use it
in a humid, dusty or chemically aggressive environment.
• This device is a thermostat that can be controlled via a
wireless Wi-Fi network. To prevent jamming, keep it away
from such electric equipment which may interfere with
wireless communications.

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• The manufacturer will assume no responsibility for any
possible direct or indirect damages or income losses
incurring during the use of the device.
• The device will not work without power supply, but the
thermostat is able to memorize settings. In case of power
failure (outage) it can resume operation without any external
intervention after the power supply is restored, provided that
this option has been chosen among settings (see Chapter
10). If you intend to use the device in an environment where
power outages occur frequently, for safety purposes we
propose you to control proper operation of the thermostat
regularly.
• Before actually starting to control the device connected
to the thermostat, make sure that the device is perfectly
functioning when it is controlled by the thermostat and
it can be operated reliably.
• The software of the thermostat and the telephone application
is constantly upgraded and updated. For proper operation
please check regularly whether there is any accessible
software or telephone application update, and always use
their latest version. Due to constant updates it is possible

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that some functions of the device and the applications
operate and appear in a way other than described in these
instructions for use.

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Figure 1.
3. INFORMATION APPEARING ON THE
DISPLAY OF THE THERMOSTAT

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4. FUNCTIONS ACCESSIBLE IN THE PHONE
APPLICATION
Figure 2.

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5. LOCATION OF THE THERMOSTAT
It is expedient to install the thermostat on the wall of a room
used regularly or for a prolonged stay, so that it is located in
the direction of natural air movement in the room, but do not
expose it to draughts of air or extreme heat e󰀨ects (e.g. solar
radiation, refrigerator or chimney). Its optimal position is at a
height of 0.75 - 1.5 m from the oor level.
The product has been designed so that it can be installed
most easily by sinking it in a 65 mm electric mounting box
built in the wall (Figure 5).
6. CONNECTION AND INSTALLATION OF
THE THERMOSTAT AND PUTTING IT INTO
OPERATION
Attention! Make sure that the COMPUTHERM E280FC
thermostat and the apparatus to be controlled are de-
energized while putting them into operation. The device
should be installed and put into operation by a competent
person! If you do not possess the necessary skills and
qualica tions, please get in touch with an authorized
service.
Caution! The modication of the device poses a risk of
electric shock or breakdown!

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6.1. Connection of the device(s) to be controlled
The fan coil device to be controlled and the valve adjusters must
be connected to the terminal block on the back of the product.
The fan coil device must be connected to the Low, Med and Hi
(low, medium and high fan speed) outputs of the relays in the
thermostat and the valve adjusters to the outputs of Valve1 and
Valve2. When switched o󰀨, no voltage is displayed on these
outputs. When switched on, the mains phase is displayed on
one of the Low, Med or Hi outputs, and 230 V mains voltage
is displayed on the Valve1 and Valve2 outputs. Figure 3
illustrates the connection of the devices to be controlled.
Figure 3.

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6.2. Connection to the electrical network
The product should be connected to the 230 V network through a
two core cable. Power supply should be connected to points Nand
Lof the terminal block located on the rear side of the thermostat.
You do not have to take care of phase correctness during the
connection process (Figure 3). It is not necessary to connect a
ground wire because the product is double insulated.
6.3. Mounting the thermostat
To install the thermostat you should separate the front plate from
the black plate. To do so, slide the front plate of the thermostat
upwards and slide the rear part of the product downwards at
the same time (Figure 4). Following this, place the rear part of
the product into the 65 mm electric wall mount box then secure
it by screws (Figure 5). Finally, slide back the front plate of the
product into the back plate.
Figure 4. Figure 5.

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7. SETTING UP THE INTERNET CONTROL
7.1. Installing the application
The thermostat can be controlled by both a smartphone and a
tablet with the help of free application COMPUTHERM E Series.
Application COMPUTHERM E Series can be downloaded to iOS
and Android operating systems.
The applications are accessible through the following link or
using a QR code:
https://computherm.info/en/wi-_thermostats

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Attention! In addition to English, the application is also available
in Hungarian and Romanian languages, and is automatically
displayed in the language corresponding to the default settings
of the phone (in case of default settings are other than these
three languages, it is displayed in English).
7.2. Connecting the thermostat to a Wi-Fi network
To be able to control the device remotely, you need connected
it to the Internet via a Wi-Fi network. The already congured
COMPUTHERM E280FC can work according to a pre-set
program without the need for a permanent Internet connection.
Attention! The thermostat can only be connected to a 2.4 GHz
Wi-Fi network.
To complete the synchronization, follow these steps:
• On your phone/tablet switch on Wi-Fi connection. Join to
the 2.4 GHz Wi-Fi network to be used for the thermostat.
• Activate the positioning (GPS location) feature on your
phone.
• Start the COMPUTHERM ESeries application.

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• Give all the requested permissions to the application in
order to work properly.
• Turn o󰀨 the device by tapping button on the thermostat.
• Touch and hold the button for approx. for 10 seconds until
the symbol on the display ashes quickly.
• Now touch the “Congure” icon in the right bottom corner in
the application.
• On the page that appears, the name of the Wi-Fi network
you want to use is displayed (if not, make sure your phone
is connected to that Wi-Fi network, the application has all
the necessary permissions and the GPS location is turned
on). If you want to connect your thermostat to another
Wi-Fi network, you can connect your phone to another Wi-Fi
network by touching the “Arrows” icon. Enter the network
password then tap the “Connect” icon.
• If your phone is connected to a 5 GHz Wi-Fi network, the
application will notify you in a pop-up window and displays
the available 2.4 GHz networks. Select the network you
want to connect your thermostat to, and tap the “Connect”
icon again.
• The connection has been established successfully between
the thermostat and the Wi-Fi network when on the display

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of the thermostat the symbol starts to illuminate
continuously.
7.3. Connecting the thermostat to the application
• You can search for COMPUTHERM E series thermostats
connected to the Wi-Fi network concerned by tapping the
“Search” icon in the left bottom corner (i.e. this requires that
the thermostat is connected to the same Wi-Fi network used
for the phone).
• On the appearing page “Search List” you can choose the
thermostat you wish to assign to the installed application.
Touching the name of the thermostat concerned, it is
assigned to the application and from now on the thermostat
can be controlled from anywhere. Following this, on the
start screen of the application all assigned thermostats
appear, together with currently measured (PV) and set (SV)
temperatures.
7.4. Controlling the thermostat by multiple users
When several users wish to control the same thermostat, after
the thermostat has been put into operation the following steps
should be carried out to add further users:

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• Connect your smartphone/tablet to the Wi-Fi network to
which the COMPUTHERM E280FC thermostat has been
connected.
• On the apparatus you want to use for controlling download
then start application COMPUTHERM E Series.
• Tapping the “Search” icon in the left bottom corner,
the phone/table will search COMPUTHERM E Series
thermostats connected to the Wi-Fi network concerned.
• On the appearing page “Search List” you can choose the
thermostat you wish to assign to the installed application.
Touching the name of the thermostat concerned, it will be
assigned to the application, and from now on the thermostat
can be controlled from anywhere. Following this, on the
start screen of the application all assigned thermostats
appear, together with currently measured (PV) and set (SV)
temperatures.
Attention! If you want to avoid that other users can add your
COMPUTHERM E280FC thermostat to their phone applications,
you can disable this operation as described in Sub-chapter 9.2.

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8. BASIC OPERATION OF THE THERMOSTAT
When switched on, the thermostat controls the connected
device(s) fan coil and valve adjuster) based on the measured
and currently set (manually or programmed) temperature, the
switching sensitivity of the thermostat (factory default ± 0.2 °C).
This means that if the thermostat is set to heating mode and 22
°C, at a switching sensitivity of ±0.2 °C, the thermostat’s output
relays will close at temperatures below 21.8 °C and opened at
temperatures above 22.2 °C.
Attention! The operation of the outputs largely depends on the
operating modes that can be changed in the thermostat settings.
For proper operation, read chapter 10 carefully. When the outputs
are switched on, the 230 V mains voltage is displayed!
The switched-on state of the fan output is indicated by one of
the icons on the display, the switched-on state of the
valve outputs is indicated by the and icons on the
display.
Attention! Keep in mind that in case of a power outage any
setting of the thermostat will be stored on an external server
therefore updating of data on the server takes a few seconds.
Accordingly, when you modify some setting of the thermostat
(operation-related setting, programming, set temperature, etc.)

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and the power supply of the device is interrupted within a few
seconds, the modied settings will not necessarily be saved.
9. BASIC SETTINGS
After the application has been started, COMPUTHERM E series
thermostats assigned to the application concerned appear on
page “My Thermostat’s”.
9.1. Renaming the thermostat assigned to the application
To modify the default name of the thermostat tap and hold the
thermostat concerned within the application until a pop-up
window with the name of “Edit thermostat” appears. Here you
can modify the name of the thermostat within the application by
tapping the “Modify current thermostat” icon.
9.2. Disabling further connections of the thermostat
assigned to the application
If you want to prevent other users from assigning the thermostat
to their phone applications then tap and hold the thermostat
concerned within the application until a pop-up window with the
name of “Edit Thermostat” appears.