24/46
Siemens
Heating controllers RVP201 and RVP211
CE1P2464en
Building Technologies
3 Technical design
2017-07-21
the composite outside temperature (T
AM
). Since the composite outside temperature
is attenuated, it represents the impact of short-term variations of the outside temper-
ature 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
N
+ T
ECO
(normal setpoint plus ECO temperature)
A room temperature setpoint w
N
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)
3.6
Frost protection for the plant and the building
3.6.1 Frost protection for the plant
Frost protection for the plant provides protection against freezing by activating the heat-
ing circuit pump, if controller and heat generating equipment are ready to operate
(mains voltage present).
Frost protection for the plant can be provided with or without an outside sensor. The
switching differential is 1 K (fixed value).
Example
Example
