Manual Siemens RVP201 (page 23 of 46) (English)

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Siemens Heating controllers RVP201 and RVP211 CE1P2464en

Building Technologies 3 Technical design 12.12.2007

3.5.2 Compensating and auxiliary variables

Also refer to "3.3.3 Compensating variables".

The ECO automatic energy saver necessitates an outside sensor. As compensating

and auxiliary variables, it takes into account the development of the outside tempera-

ture and the building's heat storage capacity. The following parameters are considered:

• the building's time constant

• the actual outside temperature (T

)

• the attenuated outside temperature (T

). Compared to the actual outside tempera-

ture, the attenuated outside temperature is significantly dampened.

This ensures that no heating will be provided in the summer by making certain that

the heating will not be switched on during a few cool days

• the composite outside temperature (T

). Since the composite outside temperature

is attenuated, it represents the impact of short-term variations of the outside tem-

perature on the room temperature as they often occur during intermediate seasons

(spring and autumn)

By considering the attenuated outside temperature, the ECO automatic energy saver

takes into account the thermal inertia of the building should temperature variations

occur.

3.5.3 Heating limit

The ECO automatic energy saver requires a heating limit to set an ECO temperature in

the range –10…+8 K. From this setting value and the room temperature setpoint, the

heating limit is calculated.

3.5.4 Mode of operation of ECO function 1

ECO function 1 operates as an automatic summer / winter switch. The heating will be

switched off (mixing valve closes or burner off, heating circuit pump off) when the at-

tenuated outside temperature exceeds the heating limit.

It is switched on again as soon as all three outside temperatures have fallen below the

heating limit by an amount equal to the switching differential.

The heating limit is determined as follows:

Heating limit = w

+ T

ECO

(normal setpoint plus ECO temperature)

A room temperature setpoint w

of +20 °C and an ECO temperature T

ECO

of –5 K give

a heating limit of +15 °C.

3.5.5 Mode of operation of ECO function 2

ECO function 2 operates as an automatic 24-hour limit switch. The heating will be

switched off (mixing valve closes or burner off, heating circuit pump off) when the actual

or the composite outside temperature exceeds the heating limit.

It is switched on again as soon as all three outside temperatures have fallen below the

heating limit by an amount equal to the switching differential.

The heating limit is determined as follows:

Heating limit = w

akt

+ T

ECO

(current setpoint plus ECO temperature)

In contrast to ECO function 1, it is taken into consideration here when a reduced tem-

perature level is maintained.

A room temperature setpoint w

akt

of +18 °C and an ECO temperature T

ECO

of –5 K give

a heating limit of +13 °C.

In the case of protection mode, the ECO function does not use a setpoint, but a fixed

value. Also, the heating limit has a minimum limitation. It cannot be lower than 2 °C.

The heating limit is determined as follows:

5 + T

ECO

(fixed value of 5 °C plus ECO temperature)

Note

Example

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