Application manual
KNX room temperature controller EK-EQ2-TP
Release 3.00 - Updating: 27/06/2017
Application Manual
© SBS S.p.A. - All rights reserved
Page 50
Object name
Conditions
Dim.
Flags
DPT
Comm.
Obj.
No.
Economy setpoint (heating)
2 Byte
CRWTU-
[9.001] temperature (°C)
61
Building protection setpoint
(heating)
2 Byte
CRWTU-
[9.001] temperature (°C)
63
Heating out command
Control type = 2
points hysteresis or
PWM
1 Bit
CR-T--
[1.001] switch
65
Heating and cooling out
command
Control type =
continuous
1 Bit
CR-T--
[1.001] switch
65
Heating and cooling out
command
Control type =
continuous
1 Byte
CR-T--
[5.001] percentage (0..100%)
65
Auxiliary heating output
command
Auxiliary heating =
enabled
1 Bit
CR-T--
[1.001] switch
67
Auxiliary heating disable
Auxiliary heating =
enabled,
Disabled from bus =
yes
1 Bit
C-W---
[1.003] enable
69
About the floor temperature limitation function
The floor heating system (warm water version) provides plastic pipes embedded in the concrete layer or
placed directly under the final coating of the floor (light or "dry" system) filled by heated water. The water
releases heat to the final coating that heats the room by radiation. The standard EN 1264 Floor heating (Part
3: Systems and components - Dimensioning) prescribes a maximum allowed temperature (T
Smax
) for the
surface of the floor that is physiologically correct defined as:
T
Smax
≤ 29°C for zones of normal occupancy;
T
Smax
≤ 35°C for peripheral zones of the rooms.
National standards may also limit these temperatures at lower values. Peripheral zones are strips generally
located along the external walls with a maximum width of 1 m.
The floor heating system (electrically powered version) involves the laying under the floor coating of an
electric cable powered by the mains voltage (230 V) or low voltage (for example 12 or 45 V), possibly
already prepared in the form of rolls with constant distance between sections of cable. The powered cable
releases heat to the overlying coating that heats the room by radiation. The regulation is based on
measurement of the temperature of the air mass, but generally requires the monitoring and limiting of the
surface temperature by using a NTC-type sensor which is in contact with the floor surface.
The surface temperature limitation may be realized for several purposes:
physiological compatibility (correct temperature at the height of the legs);
when the system is used as auxiliary stage for heating. In this case, the heat losses to the exterior
of the building are handled by the main heating stage, while the auxiliary stage only works to keep
the floor temperature at a comfortable level (for example in bathrooms of residential buildings,
sports centers , spas and thermal baths, etc.);
protection against damages of the final coating due to an accidental overheating. Note that the
warm water radiant panels are usually already equipped with a safety thermostat (with intervention