Room Temperature Limitation; Mixing Valve Control - Siemens RVS41.813 User Manual

Room temperature limitation

Mixing valve control

Mixing valve cooling offset
Actuator:type
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slight increase of the room temperature causes an immediate drop of the flow
temperature.
To activate the function, following must be considered:
•
A room sensor must be connected
•
"Room influence" must be set to 100%
•
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)
Line no. Operating line
932 Room temperature limitation
The "Room temperature limitation" function makes it possible to deactivate the cooling
circuit pump if the room temperature falls by more than the preset difference below the
effective room temperature setpoint (with summer compensation, 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.
During the time the "Room temperature limitation" function is active, no cooling request
is sent to the 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
Line no. Operating line
938 Mixing valve decrease
939 Actuator:type
2-position ¦ 3-position
940 Switching differential
2-pos
941 Actuator running time
945 Mixing valve in heating mode
Control ¦ Open
The refrigeration request from the mixing valve circuit to the source is reduced by the
preset value. The purpose of this reduction is to enable the mixing valve controller to
compensate for the variation in temperature caused by the source (2-position control).
2-position
The controller drives the actuator with only one relay output. When the output delivers a
signal, the valve opens. When there is no signal, the valve closes automatically.
3-position
User manual RVS61.843, RVS41.813
6 The settings in detail
TRx Actual room temperature
TRKw Room temperature setpoint cooling
TRKw
compensation)
TRKw-SDR
SDR Room's switching differential
P Pump
t Time
(incl. summer
CE1U2355en_02
28. September 2009