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Room temperature controller | Room temperature controller - General
configured heating/cooling operating mode immediately after the initialisation
phase. In case of parameterisation "Operating mode before reset" the operat-
ing mode which was selected before the reset will be activated.
Setpoint temperatures can be specified for each operating mode in the ETS as
part of configuration. It is possible to configure the setpoints for the "Comfort",
"Standby" and "Night" modes directly (absolute setpoint presetting) or relat-
ively (derivation from basic setpoint). With absolute setpoint presetting there is
no basic setpoint and also no deadband in the mixed operating mode "Heating
and cooling" (if necessary also with additional level). Consequently, the room
temperature controller cannot control the switchover of the operating mode
automatically, which is why, in this configuration, the setting for the parameter
"Heating/cooling switchover" is fixed in the ETS to "via object".
10.2.3 Type of control
Introduction
To facilitate convenient temperature control in living or business spaces a specific
control algorithm which controls the installed heating or cooling systems is required.
Taking account of the preset temperature setpoints and the actual room temperature,
the controller thus determines command values which trigger the heating or the cool-
ing system. The control system (control circuit) consists of a room temperature con-
troller, a valve drive or an actuator with switching output signals (e.g. heating actuator
when ETD electrothermal drives are used), the actual heating or cooling element
(e.g. radiator or cooling ceiling) and of the room. This results in a controlled system
(see figure 26).
Image 26: Controlled system of single-room temperature control
(20)
Setpoint temperature specification
(21)
Room temperature controller
(22)
Control algorithm
(23)
Command value
(24)
Valve control (valve drive, ETD, heating actuator, ...)
(25)
Heat / cold exchanger (radiator, cooling ceiling, FanCoil, ...)
(26)
Fault variable (sunlight penetration, outdoor temperature, illumination sys-
tems, ...)
(27)
Room
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
Page 124 of 257
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