Adapting the unit to the heating installation 10
0020196687_03 flexoTHERM exclusive Installation and maintenance instructions
29
9.6
Heating mode flow temperature control
For economical and fault-free operation of a heat pump, it is
important to regulate the start of the compressor. Using the
energy balance control, it is possible to minimise the num-
ber of heat pump start-ups without having to forgo the con-
venience of a comfortable room environment. As with other
weather-compensated heating controls, the control determ-
ines a target flow temperature by recording the outdoor tem-
perature using a heating curve. The energy balance calcu-
lation is made on the basis of this target flow temperature
and the actual flow temperature
–
the difference per minute
is measured and added up:
1 degree minute [°min] = 1 K temperature difference in the
course of 1 minute
The heat pump starts up at a defined heat deficit (under the
menu item
Configuration
→
Compressor starts at
) and only
switches off again when the supplied heat volume is equal
to the heat deficit. The larger the preset negative numerical
value, the longer the periods for which the compressor oper-
ates or does not operate.
As an additional condition, if there is a deviation of more than
7 K between the actual flow temperature and the target flow
temperature, the compressor is directly switched on and
switched off. The compressor always starts immediately if
a heating demand only just arises from the control (e.g. due
to a time period or switching the gas-fired boiler operation to
heat pump mode).
Time conditions for compressor operation
The following shall always apply for operation:
–
Minimum running time: 3 minutes
–
Minimum rest period: 7 minutes
–
Minimum time from start to start: 20 minutes
9.7
Calling up statistics
Menu
→
Installer level
→
Test menu
→
Statistics
You can use this function to call up the statistics for the heat
pump.
9.8
Checking that the product works correctly
1.
Start up the product in accordance with the relevant
operating instructions.
2.
Navigate to
Menu
→
Installer level
→
Test menu
→
Check programs
.
3.
Check the heating mode.
4.
Check the domestic hot water mode.
5.
Check the cooling mode.
10 Adapting the unit to the heating
installation
10.1
Setting parameters
The installation assistant is launched when the product is
switched on for the first time. When the installation assistant
is complete, you can further adjust the parameters of the in-
stallation assistant, for example, in the
Configuration
menu.
Menu
→
Installer level Configuration
10.2
Setting the high-efficiency pumps
10.2.1 Setting the building circuit pump
Automatic mode
At the factory, the nominal volume flow is automatically
achieved by volume flow regulation. This volume flow
regulation allows for efficient operation of the building circuit
pump because the pump speed is adjusted to the hydraulic
resistance of the system. Vaillant recommends that you
retain this setting.
Manual mode
Menu
→
Installer level
→
Configuration
→
Conf. heat.
build. pump
Menu
→
Installer level
→
Configuration
→
Conf. cool.
build. pump
Menu
→
Installer level
→
Configuration
→
Conf. DHW
build. pump
If you do not want to operate the pump in automatic mode,
you can set it to manual mode in the
Configuration
menu
for different operating modes. The diagrams below show
how setting the pump actuation affects the remaining feed
head at nominal volume flow for a temperature spread of 5 K
on the heating side.
Setting the maximum differential pressure in the
building circuit
Menu
→
Installer level
→
Configuration
→
Max. remaining
feed head
If the differential pressure in the building circuit is not per-
mitted to exceed a maximum value, this limit can be set in
the
Configuration
menu within the range of 0.02 to 0.1 MPa
(200 to 1000 mbar).
