Application manual
Air quality multisensor and regulator EK-ES2-TP
Release 1.0 - Updated: 14/02/2020
Application Manual
© EKINEX S.p.A. - All rights reserved
Page 7
Foreword
The present document describes the ekinex
®
KNX air quality multisensor and regulator, for the measurement
of temperature, relative humidity (R.H.) TVOC (Total Volatile Organic Compounds) and CO
2
equivalent
concentration, versions EK-ES2-TP….
1
General information
The device described in the present document works as an electronic digital temperature controller for a room
or a zone (consisting e.g. in a group of rooms or a whole floor) of a building and is part of the secundary
regulation for heating and cooling. The room temperature controller was developed according to the KNX
standard for use in systems of control of homes and buildings, and is equipped with 3 integrated sensors:
temperature, relative humidity and air quality. In particular, the air quality measurement is done by means of a
VOC (Volatile Organic Compound) sensor, with TVOC and CO
2
equivalent output signal.
The Multisensor can also work as a controller for these 3 parameters, that are available for a single zone to
be managed. Up to 8 integrated LEDs with lightpipe can be configured, in order to display the operating
thresholds for TVOC and CO2 equivalent, the activation of the humidification/dehumidification functionality and
the cooling/heating working modes.
The device is equipped with an integrated KNX bus communication module and is designed for wall installation
on a flush mounting box. Both the programming button and LED are located in the front of the device below
the rocker, as well as the 3 sensors. The device is powered by the KNX bus line and does not require any
auxiliary power supply.
1.1
Function
The main function of the device is to control the temperature of the air mass of the room by means of the actual
temperature (T
eff
), measured by the device itself or received by the bus, and of the setpoint temperature (T
set
)
set by the user; comparing the two values and a series of parameters set before the commissioning, the
regulation algorithm of the device calculates the control variable value that is converted to a telegram and
transmitted on the bus toward KNX actuators (such as binary outputs, fan-coli controllers, valve drives, etc.)
able to control the operation of heating and cooling terminal units.
Two decision thresholds are available for the temperature, to control the activation/deactivation of the
heating/cooling system. At the same time, two independently configurable thresholds can be managed for the
relative humidity, as well as three thresholds for both the TVOC and the CO
2
equivalent parameters.
As soon as the measured values go below or above the thresholds, it is possible to manage a corresponding
action; e.g., if the CO
2
equivalent concentration is too high, a message over the bus to the actuators can be
sent, in order to activate fans for the air mass circulation in the room. In the same way, if an excessive relative
humidity is detected by the sensors, a message over the bus can be sent, to activate the room dehumidification.
As regards the CO
2
equivalent parameter, a configurable alarm with a threshold is foreseen, with an exceeding
limit that can be set as percentage. If the building is subjected to sustainability certification according to the
LEED protocol (Leadership in Energy and Environmental Design, by the US Green Building Council), the
configuration of such alarm function can be useful to get the EQ Credit (Advanced Strategies for indoor air
quality), with reference to requirement C (carbon dioxide monitoring).
1.2
Main functional features
The main functions carried out by the device are:
Temperature, relative humidity and air quality (TVOC and CO
2
equivalent) measuring through the
integrated sensors, with possibility of sending the read valued on the bus;