Quick Setback With Room Sensor - Siemens RVA47.320 User Manual

Benefit
Description
Important
Process
Effect
Note
Siemens Building Technologies
HVAC Products
7.4

Quick setback with room sensor

•
Making use of the building's thermal storage capacity.
Quick setback is dependent on whether or not a room temperature sensor is used. A
differentiation must therefore be made between quick setback with or without room
sensor.
This process has an impact only when a room temperature sensor is used.
Quick setback is started as soon as a change to a lower room temperature setpoint
takes place (e.g. switching times in automatic mode).
Quick setback is terminated as soon as the actual room temperature reaches the level
of the respective room temperature setpoint (TRx = TRw).
°C
20
15
TRw
H
ON
OFF
TRx Actual value of the room temperature
TRw Room temperature setpoint
H Quick setback
During quick setback, the heating circuit pump will be deactivated and there will be no
demand for heat. This means that the room temperature falls quicker since the supply
of heat from the flow or boiler is cut off.
Exception Due to frost protection for the plant, the heating circuit pump can be
activated however in spite of quick setback.
If no room sensor is connected, quick setback will not be accomplished through this
process. For details, refer to section "Quick setback constant", operating line 31
Basic Documentation RVA47.320
Functions with no settings
TRx
t
t
.
OEM
139/166
CE1P2379E
15.07.2002