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Benefit
Description
Setting
Effect
228/348
Siemens Building Technologies
HVAC Products
4.208.2
With room temperature sensor
Optimum start control acts only when room influence is active.
The switch-on time for the heating (change to nominal level) is selected such that, at
the beginning of the occupancy time according to the heating program, the room tem-
perature reached will be the room temperature setpoint - 0.25 K.
The correct switch-on time is determined by adapting gradient "g". This gradient indi-
cates the necessary time to increase the room temperature during fast heating up by 1
K. This adaption always takes place during the first occupancy period per day.
The forward shift is calculated as follows:
t
= g * (TRw
- TRx – 0.25K)
E
Nenn
TRw
Nominal room temperature setpoint
Nenn
TRx
Actual value of the room temperature
g)
Gradient of optimum start control
4.209 Maximum forward shift of optimum stop
control
• Limitation of optimum stop control
The forward shift of optimum stop control can be limited to a maximum.
Setting range
00:00...06:00
The adjusted value will automatically be displayed on this operating line.
00:00
Optimum stop control is switched off.
00:10 - Maximum forward shift of optimum stop control
06:00
Optimum stop control acts only when a room sensor is used and when room influence
is active.
The maximum forward shift can be set with parameter "Maximum forward shift with op-
timum stop control" (range is 0...6 h). This parameter can also be used to switch opti-
mum stop control off (setting = 0).
During occupancy hours, the heating is maintained at the nominal level. Towards the
end of the occupancy time, the control switches to the reduced level.
Optimization calculates the changeover time such that, at the end of occupancy time,
the room temperature will be 0.5 °C below the nominal setpoint (early shut-down).
Adaption takes place only with the first occupancy period per day. The switch-off point
is adapted in steps of 10 minutes. If the 0.25 K are not reached, the switch-off point is
shifted forward by 10 minutes (earlier shutdown). In the other case, the switch-off point
is shifted backward by 10 minutes (later shutdown).
Basic Documentation RVP540 / RVP550
Description of the heating engineer settings
Unit
Factory setting
hh:mm
00:00
CE1P2488en
18.10.2002
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