Enabling the function
Initiating the function
Terminating the function
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.
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.
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!
RXB (KNX) application library
General and central functions
FNC Description of functions for FC-10, FC-11, FC-12
28 Feb 2009