Installation instructions geoTHERM VWS/VWW 0020051574_01
50
The heat pump starts up at a defined heat deficit (se-
lectable on the controller, see Menu C4) and only
switches off again when the supplied heat is equal to
the heat deficit.
The larger the preset negative numerical value is, the
longer the periods for which the compressor is kept run-
ning or at standstill.
8.4.3 Buffer cylinder charging principle
The buffer cylinder is controlled depending on the set-
point flow temperature. The heat pump heats when the
temperature of the buffer cylinder head temperature
sensor VF1 is smaller than the set target temperature. It
heats until the temperature measured by the sensor at
the base of the buffer cylinder, RF1, has reached the set-
point temperature plus 2 K.
When connected to a DHW cylinder charging circuit the
buffer cylinder is also charged when the temperature of
the head temperature sensor VF1 is less than 2 K higher
than the set target temperature (premature reheating):
VF1 < T VL set + 2 K.
8.4.4 Resetting to factory settings
a
Caution!
Inadvertent deletion of specific settings!
When you reset the control system to
the default settings, specific system
settings can be deleted and the system
can shut down. The system does not
suffer damage.
• Press both dials simultaneously for at least
5 seconds in the top-level display of the graphics
display.
After that you can select whether to reset only the
timer programme or all values to the default settings.
8.4.5 Controller
structure
The
top level display
is a
graphics display
. It is the
starting point for all the available displays. This display
reappears automatically if you do not actuate any of the
dials for a long time when setting values.
In the following illustrations you can see all the control-
ler screens in an overview in the form of a flow chart.
You will find descriptions of the individual screens in the
sections that follow them.
Controller operation is subdivided into three levels:
The Operator level is intended for the operator.
The Code level (Menus C1 - C9, D1 - D5, I1 - I5 and
A1 - A9) is reserved for the specialist and is protected
against unintentional adjustments by means of a code
input.
The following parameters can be displayed in the indi-
vidual menus, but the values cannot be changed if no
password is entered, i. e. access to the code level is dis-
abled.
In Menus C1 to C9 you can set parameters for the vari-
ous functions of the heat pump for the heating circuit.
In Menus D1 to D5 you can operate and test the heat
pump in diagnostic mode.
In Menus I1 to I5 you can obtain general information re-
garding the settings for the heat pump.
In Menus A1 to A9 you are guided through the installa-
tion menu during the initial commissioning of the heat
pump.
Furthermore it is possible to display and select special
functions, such as the energy saving function. To do
this, press the dial once, twice, or three times, starting
from the top-level display (see Fig. 8.1).
The third level contains functions for optimising the
system and can only be set by a specialist using
vrDIALOG 810/2 (see Chap. 8.10).
8 Controller
