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Siemens
RXB (KNX) application library
FNC Description of functions for FC-10, FC-11, FC-12 CM110385en_05
Building Technologies
General and central functions
28 Feb 2009
11.10 Precooling (Precool, 5)
This function is used to cool rooms to the
Comfort
cooling setpoint, in readiness for
normal occupancy. The fan and cooling coil are used here to precool the rooms.
100
TR
10
3
85D
25
0
Y [%]
SpH
Cmf
SpC
Cmf
Fan
Cooling coil
The following condition must be fulfilled:
– The room controller must be in
Economy
or
Precomfort
mode.
The function can be disabled in the room controller by means of the ETS3 tool ,
together with Free cooling, see central functions, page 123.
The function must be enabled via the building automation and control system
(communication object
Application mode
, see page 128).
The function is disabled via the building automation and control system.
11.11 Test mode (Test, 7)
The following override functions are used to commission the controller and for service
purposes, e.g. to test a valve actuator.
The controller must first be switched to HVAC test mode by transmitting the value
7=TEST via
Application mode.
To quit test mode, first transmit 6=OFF, and then 0=AUTO.
In test mode, the valves, air dampers, electric heating coils and fans can be set to
defined values via KNX bus signals.
A soft reset is carried out when the controller exits from Test mode:
– Motorized valve actuators and dampers are synchronized.
– Thermal valves are preheated (see page 86).
– The control algorithm but not the complete application is restarted.
Test mode is possible only with S-mode objects!
Enabling the function
Initiating the function
Terminating the function
Test mode
Aggregates
Soft reset
Limitations
