Siemens RVD240, Основная документация

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Siemens Building Technologies Basic documentation RVD240 CE1P2384en
HVAC Products 12 Function block Space heating 27.05.2004
12 Function block Space heating
12.1 Operating lines
Line Function, parameter Unit
Factory
setting
Range
61 Heating limit (ECO) K –3 --- / –10...+10
62 Building time constant h 20 0...50
70 Effect of the room temperature (gain factor) 10 0...20
71 Parallel displacement of the heating curve K 0.0 –15.0...+15.0
72 Pump overrun time heating circuit pump min 4 0...40
73 Maximum limitation of room temperature K --- --- / 0.5...4
74 Optimization with / without room temperature sensor 0 0 / 1
75 Maximum heating up time h 0:00 0:00...42:00
76 Maximum early shutdown h 0:00 0:00...6:00
77 Maximum rate of flow temperature increase °C/h --- --- / 1...600
78 Quick setback 1 0 / 1
12.2 Compensating variables
12.2.1 Outside temperature
The RVD240 makes use of 3 types of outside temperatures:
•
The actual outside temperature (T
A
)
•
The composite outside temperature (T
AM
). It is generated by filtering the actual out-
side temperature by the building time constant. The proportion of the actual outside
temperature is 50 %.
The composite outside temperature suppresses unnecessary reactions of the control
system if the outside temperature changes for short periods of time.
In the case of the weather-compensated control (without or with room influence), the
RVD240 uses the composite outside temperature.
The building time constant is a measure of the type of building construction and indi-
cates how quickly the room temperature would change if the outside temperature
suddenly changed. The building time constant is adjustable and applies to both heat-
ing circuits:
Type of building construction Recommended building time constant
Light 10 h
Medium 20 h
Heavy 50 h
•
The attenuated outside temperature (T
AD
). It is generated by filtering twice the actual
outside temperature by the building time constant. This means that, compared with
the actual outside temperature, the attenuated outside temperature is considerably
dampened. This ensures that no heating will take place in the summer when, under
normal circumstances, the heating would be switched on because the outside tem-
perature drops for a few days
If operating line 25 is selected (display of the actual room temperature) and the two
buttons
and are pressed simultaneously for about 3 seconds, the attenuated and
the composite outside temperature will generate the current measured value; the gen-
eration of these two variables will then start anew (outside temperature reset).
Tip