Chilled Ceiling (Clc01); Select Actuator Types For Chilled Ceiling - Siemens Desigo RXB Technical Manual

Technical manual
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Actuator type
HandyTool
Thermal valve actuators
Notes
Siemens
Building Technologies
8.2

Chilled ceiling (CLC01)

The chilled ceiling application has a continuous cooling sequence. The room controllers
operate with a PI algorithm optimized for thermal or motorized valve actuators. (For
simplicity, the diagram below only shows the P-control action.)
The control sequence comes into operation at the effective setpoints for cooling (see
page 67).
Y [%]
100
YC
0
SpC
8.2.1

Select actuator types for chilled ceiling

See section 8.1.1 , page 79 on selecting actuator types for radiators.
The following information differs from the radiator applications:
Parameter
Short name
*051
Actuat c'surf valve
Settings
STE71
1
SSA81
STA71
3
SSB81
STP71
4
SQS81
STA72E
5
SSC81
STP72E
6
SSP81
• If thermal actuators are selected, Y3 / Y4 are always controlled in parallel to ensure
that several actuators can be connected at the same time.
• Exact parallel operation of several thermal valve actuators is not guaranteed. If
several radiators are controlled by the same controller, motorized actuators are the
preferred device.
If nevertheless thermal actuators are controlled in parallel, "3rd Party Thermic" must
be parameterized regardless of make.
• Thermal actuators work at higher temperatures. To ensure a fast reaction, the
actuators are slightly preheated continuously (5% – 1 sec ON / 19 sec OFF). Then
thus also receive pulses from the controller when closed.
RXB (KNX) Applications library
Control sequences
C
Y
Output signal
TR
Room temperature
SpC
Effective cooling setpoint
C
Cooling sequence
YC
Cooling valve
TR [°C]
10
Motoric bus
rd
11
El'mech 3
rd
12
Thermal 3
rd
13
Motoric 3
party devices
14
CLC and RAD description of functions for CC-02 CM110384en_03
Basic setting
STA71
250
party devices
252
party devices
253
254
28 Feb 2009
87/140

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