Bedienungsanleitung Siemens RVP351 (Seite 30 von 108) (Englisch)

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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en

Building Technologies 9 Function block: Space heating 15.03.2011

9 Function block: Space heating

This function block performs the automatic ECO function, the optimization

functions with boost heating and quick setback, plus room influence.

9.1 Operating lines

Line Function, parameter Factory setting (range) Unit

61 NORMAL heating limit (ECO day) 17.0 (--.- / 5...25) °C

62 REDUCED heating limit (ECO night) 5.0 (--.- / –5...25) °C

63 Building time constant 20 (0...50) h

64 Quick setback 1 (0 / 1)

65 Room temperature source A (0…3 / A)

66 Type of optimization 0 (0 / 1)

67 Maximum heating up period 00:00 (00:00...42:00) h

68 Maximum early shutdown 0:00 (0:00...6:00) h

69 Maximum limitation room temperature --.-- (--.- / 0...35) °C

70 Influence of room temperature (gain factor) 4 (0...20)

71 Boost of room temperature setpoint on boost heating 5 (0...20) °C

9.2 Automatic ECO function

The automatic ECO function controls space heating depending on demand. It gives

consideration to the progression of the room temperature depending on the type of

building structure as the outside temperature varies. If the amount of heat stored in

the house or building is sufficient to maintain the room temperature setpoint cur-

rently required, the heating is switched off.

The automatic ECO function ensures that the heating system operates only, or

uses energy only, when indeed required.

9.2.1 Compensating and auxiliary variables

The compensating and auxiliary variables considered by the automatic ECO func-

tion are the progression of the outside temperature and the heat storage capacity

of the building.

The following variables are taken into account:

 The building time constant: This is a measure of the type of building structure

and indicates how quickly the room temperature would vary if the outside tem-

perature suddenly changed. The following guide values can be used for setting

the building time constant: 10 hours for light, 25 hours for medium, and 50 hours

for heavy building structures

 The current outside temperature (T

)

 The composite outside temperature (T

). It is the mean value of …

 the current outside temperature,

 the outside temperature filtered by the building time constant

Compared with the current outside temperature, the composite outside tempera-

ture is attenuated. Hence, it represents the impact of short-time outside tempera-

ture variations on the room temperature as they often occur during intermediate

seasons (spring and autumn).

 The attenuated outside temperature (T

): It is generated by double-filtering the

current outside temperature by the building time constant. This means that – in

comparison with the current outside temperature – the attenuated outside tem-

perature is considerably dampened. This ensures that no heating is provided in

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