Fujitsu WATERSTAGE WS A050DD6 Series Maintenance Document page 57

Split system single phase type
Quick setback
Line no.
HC1 HC2
760 1060
780 1080
Room temp limitation
The "Room temperature limitation" function enables
the heating circuit pump to be deactivated should the
room temperature
temperature setpoint by more than the adjusted
differential.
The heating circuit pump is activated again as soon
as the room temperature falls to a level below the
current room temperature setpoint.
During the time the "Room temperature limitation"
function is active, no heat request is sent to the
producer.
TRx Actual value of room temperature
TRw Room temperature setpoint
SDR Room switching differential
P Pump
T Time
Maintenance Document 1589-3
Programming line
Room temp limitation
Quick setback
exceed the current
Quick setback
During quick setback, the heating circuit pump is
deactivated and, in the case of mixing circuits, the
room
mixing valve is fully closed.
When using a room sensor, the function keeps the
heating off until the room temperature drops to the
level of the "Reduced" or "Frost protection" setpoint.
If the room temperature falls to the reduced or frost
level, the heating circuit pump is activated and the
mixing valve released.
Quick setback switches the heating off for a certain
period of time, depending on the outside temperature
and the building time constant.
Duration of quick setback when "Comfort" setpoint
minus "Reduced" setpoint = 2 K (e.g. "Comfort"
setpoint = 20 °C and "Reduced" setpoint = 18 °C)
Composite outside
temperature
15°C
10°C
5°C
0°C
-5°C
-10°C
-15°C
-20°C
Building time constant [h]
5
Duration of quick setback [h]
7.7
3.3
2.1
1.6
1.3
1.0
0.9
0.8
57