function Innovation & Technology AS
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Manual – KNX MultiLight Art.nr 44001
Doc.no. D-TS-ML-K-005-A
6
Thermostat
6.1
Regulator functionality
The thermostat can control both heating- and cooling systems and will automatically
switch between heating and cooling mode. The regulator outputs can be configured
either as ON/OFF control or continuous (0-100%) based on a PI regulator. The KNX
MultiLight has to be configured with a user panel with temperature sensor to have
temperature regulator functionality.
Regulator capability:
Four modes of operation: comfort, standby, night and frost/heat protection
On/off or 0-100% control for heating and cooling system
Combined heating- and cooling regulator with automatic switch-over
Additional heating or cooling stage with on/off control
Automatic transmission of the regulator outputs on change or cyclic every 40.
Minutes.
Room temperature measurement from the user panel
The temperature sensor can be calibrated (+/- 12.6K) in steps of 0.1 K with ETS
parameter
The temperature sensor can be internal calibrated (+/-1.5K) from the user panel
The actual temperature and the set-point temperature can be sent to the bus on
change or cyclically
Set-point values:
The base temperature set-point is defined in parameter (“Base setpoint in ºC”) and
is shown by object “Thermostat – Base setpoint”. This object can also be configured
for write access (selectable to be stored in permanent memory or not)
The working regulator set-point is shown by the object “Thermostat – Actual
setpoint”.
The base setpoint is only settable to whole degrees (eg. 21 or 22 °C)
Parameters for heating and cooling temperature set-points for standby and night
mode
Set-points for the additional heating/cooling stage are derived from the values from
the basic stage with an additional stage offset
Setpoint value shifting (local adju/-3K) by local operation on the user panel
or by object. The step size is 0.5K
The reduced or increased temperatures for standby and night mode are settable in
steps of 0.1K
Frost/heat protection: frost protection set to 10 ºC (not adjustable) and heat
protection set to 35 ºC (not adjustable)
6.2
Operational modes
The KNX MultiLight has 4 operational modes; Comfort, Stand-by, Night and Frost/heat
protection. The active mode is selected based on the three 1.bit objects "Comfort Mode",
"Night Mode" and "Frost/heat protect". The table below shows which mode is active
based on the status of these three objects (X = don’t care).
Table 4 - Regulator modes
Active mode/object
value
Comfort
Mode
Night
Mode
Frost/
heat
Standby
0
0
0
Night Mode
0
1
0
Comfort Mode
1
X
0
Frost/heat protect
X
X
1