BOH
T
BOH OFF
T
BOH ON
BOH Booster request backup heater
HP
Heat pump
t
Time
T
BOH OFF
OFF-Temperature of the booster
request (T
U
+ [7-00])
T
BOH ON
ON-Temperature of the booster
request (T
BOH OFF
– 2°C)
T
HP MAX
Maximum water temperature of the
heat pump at the temperature sensor
in the hot water storage tank (55°C)
T
HP OFF
OFF Temperature of heat pump
(T
HP MAX
– [6-01])
T
HP ON
ON Temperature of heat pump
(T
HP OFF
– [6-00])
T
U
Target temperature for hot water (as
set on main control unit (HPR1))
Fig. 4-6
View of the control system for water heating with the parameter "Step length for
hot water"
4
x
Parameter settings
40
FA ROTEX HPSU compact 308 - 02/2012
– [7-01] hysteresis value of booster request: the temperature difference used to determine the ON temperature of the booster
request (T
BOH ON
).
T
BOH ON
= T
BOH OFF
– [7-01].
The minimum value for the ON temperature of the booster request (T
BOH ON
) lies 2 °C (fixed) under the ON tem-
perature of the heat pump T
HP OFF
).
Control on the basis of 2 target values:
Can only be used for systems with different set value probes (for example second room thermostat), required for different set
values. These parameter settings allow for the use of 2 target values. However there is no display which indicates which of the
two target values is currently active.
– [7-02] Status of the control on the basis of 2 target values: determines whether the controller is activated (1) or deactivated
(0) based on 2 set values.
– [7-03] Second target value for heating: determines the second set temperature for heating operation. This set value should
be combined with the heat output source that needs the highest temperature set value during heating operation (see following
example of the ROTEX HP convector).
– [7-04] Second target value for cooling: determines the second set temperature for cooling operation. This set value should
be combined with the heat output source that needs the lowest temperature set value during cooling operation (see following
example of the ROTEX HP convector).
Application example for control with 2 set values, ROTEX HPSU compact with ROTEX HP convector
Request by
Room thermostat or
HPSU compact controller (35 °C / 18 °C)
X
Ŧ
X
Ŧ
ROTEX HP convector (45 °C / 7 °C)
Ŧ
X
X
Ŧ
Resulting flow temperatures
35 °C / 18 °C
45 °C / 7 °C
45 °C / 7 °C
Ŧ
Tab. 4 -2 Configuration example of an HPSU compact, HPR1 controller: Parameter [7-02]=1, Parameter [7-03]=45 °C, Parameter
[7-04]=7 °C Set value for room thermostat/HPSU compact for floor heating: heating = 35 °C / cooling = 18 °C
