Fujitsu WSYA050ML3 Design & Technical Manual page 77

• Quick setback
HC1
760
780
– Room temperature limitation:
The room temperature limitation function enables the heating circuit pump to be deactivated
should the room temperature exceed the current room 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 be-
low the current room temperature setpoint. During the time, the room temperature limitation
function is active, no heat request is sent to the producer.
– Quick setback:
During quick setback, the heating circuit pump is deactivated and, in the case of mixing circuits,
the 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 is 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. "Com-
fort" setpoint = 20 °C and "Reduced" setpoint = 18°C)
Composite outside temperature
3-4. Heating circuit 1 and 2 functions
Line
HC2
1060 Room temperature limitation
1080 Quick setback
°C
ON
P
OFF
TRx: Actual value of room temperature
TRw: Room temperature setpoint
SDR: Room switching differential
P: Pump
T: Time
15°C
10°C
5°C
0°C
-5°C
-10°C
-15°C
-20°C
Function
TRx
Building time constant: 5 h
Duration of quick setback (h)
- (03-19) -
TRw + SDR
TRw
T
7.7
3.3
2.1
1.6
1.3
1.0
0.9
0.8
3. Function table