Night Purge (Night Purge, 4), (Fnc10, Fnc12) - Siemens Desigo RXB Technical Manual

Enabling the function
Initiating the function
Terminating the function
Enabling the function
Initiating the function
Terminating the function
130/166
Siemens
Building Technologies
Y [%]
100
0
SpH
Pcf
The following conditions must be fulfilled:
– The room controller must be in Economy mode.
The function can be disabled in the room controller by means of the ETS3 tool.
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.
11.9

Night purge (Night Purge, 4), (FNC10, FNC12)

This function is used to cool rooms to the Comfort cooling setpoint, in readiness for
normal occupancy, using the outside air damper. Here, only the fan is active, not the
cooling coil.
Objective: Save energy by using "free of charge", cold outside air.
Y [%]
100
0
SpH SpC
Cmf Cmf
The following condition must be fulfilled:
– FNC must have an outside air damper.
– The outside air damper must not be disabled
– The room controller must be in Economy mode.
– The outside air temperature must be lower than the room temperature
(Hysteresis = 1K)
The function can be disabled in the room controller by means of the ETS3 tool; 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.
– When the outside air damper is disabled
RXB (KNX) application library
General and central functions
TR
SpC
Pcf
TR
FNC Description of functions for FC-10, FC-11, FC-12
Fan
Heating coil
Ventilator
CM110385en_05
28 Feb 2009