Siemens AVS75.39 Series User Manual page 74

Weather compensation
with room influence
Example
Pure room compensation
Room temperature
limitation
74 / 239
Siemens
Building Technologies
The deviation of the current room temperature from the setpoint is acquired and
taken into account when controlling the room temperature. This way, consideration
is given to room temperature deviations, ensuring more accurate room temperature
control. The authority of the deviation is set as a percentage value. The better the
reference room conditions (correct room temperature, correct mounting location,
etc.), the higher the value can be set.
Approx. 60% Good reference room
Approx. 20 % Unfavorable reference room
To provide the function, following must be considered:
Room temperature sensor must be connected
"Room influence" must be set to a value between 1 and 99.
There should be no controlled valves in the reference room (mounting location of
the room sensor) (If such valves are installed, they must be set to their fully open
position).
The flow temperature is controlled depending on the room temperature setpoint,
the current room temperature and the progression of room temperature. For
example, a slight increase in room temperature leads to an immediate reduction in
flow temperature.
To provide the function, following must be considered:
Room temperature sensor must be connected
"Room influence" must be set to 100%.
There should be no thermostatic radiator valves in the reference room (mounting
location of room sensor); if such valves are installed, they must be fully opened.
Line no. Operating line
932 Room temp limitation
The room temperature limitation function makes it possible to disable the cooling
circuit pump if the room temperature falls by more than the programmed offset from
the effective room setpoint (with summer compensation, operating line 920).
The heating circuit pump will be activated again as soon as the room temperature
returns to a level below the current room temperature setpoint.
While the "Room temperature limitation" function is active, no cooling request is
sent to the heat source.
The function is deactivated in the following situations:
No room temperature sensor
"Room temp limitation" = ---
"Room influence" (928) = --- (pure weather compensation)
°C
TRx
ON
P
OFF
User manual RVS43.345
The settings in detail
TRx
temperature
TRKw
TRKw
TRKw-SDR Cooling (incl. summer compensation)
SDR
B
t
Actual value of room
Room temperature setpoint
Room's switching differential
Pump
Time
CE1U2354en_021
2013-09-02