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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
11.12 Emergency heating (Emergency Heat, 8)
This function is used for emergency heating when the room temperature or return air
temperature drops below the frost protection setpoint. The function is independent of
the effective room operating mode.
It affects the control of all installed heating equipment.
When using a radiator and a heated ceiling the valve opens 100 %.
An electric radiator is switched to the highest stage and remains there until the
temperature rises above the
Protection
heating setpoint again.
When the room temperature rises above the
Protection
setpoint, the controller reverts
to the original room operation mode (see 128).
Normal operation
TR
103
85D
26
SpFr
SpH
Prt
Emergency Heat
The following condition must be fulfilled:
– The building temperature must be below the
Frost
setpoint.
The function can NOT 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
– When the room temperature rises above the
Protection
setpoint.
11.13 Rapid ventilation (Fan only, 9)
This function (formerly Air flush) is only used in
Precomfort
and
Economy
room
operating modes.
The aim is to flush the building with as much outside air as possible to renew the room
air.
To achieve the maximum air change rate, the outside air damper (if available) is
opened fully (FNC10, FNC12).
Temperature control is switched off and the heating and cooling coils are disabled.
Outside air is only introduced if the room temperature is between the
Economy
heating
and
Economy
cooling setpoints.
Enabling the function
Initiating the function
Terminating the function
