49
Installation instructions geoTHERM VWS/VWW 0020051574_01
a
Caution!
Overloading of the heat source!
If too much energy is extracted from the
heat source while drying out a floor (e.g.
in the winter months), the source can be
overloaded and its
regeneration impaired.
When the function is started, the current time of the
start is saved. The day is changed exactly at this time.
After network-off/-on, the floor-drying begins as follows:
Last day before mains off
Start after mains on
1 - 15
16
17 - 23
24 - 28
29
1
16
17
24
29
Table 8.2 Progress of the screed floor drying following mains
off/on
If you do not wish to carry out the drying with the speci-
fied temperatures and/or times, you can specify varia-
ble flow temperature setpoints by means of fixed value
controlling (see following section). When doing this, take
note of the applicable compressor hysteresis (settable
via vrDIALOG, see Chap. 8.10).
Legionella protect
The purpose of the "Legionella protect" function is to
kill off germs in the DHW tank and in the pipes.
Once a week, the domestic hot water cylinder is raised
to a temperature of approx. 70 °C.
The expert technician activates the "Legionella protect"
function in the Code level and there can set a starting
time and a starting day (weekday) on which the heating
is to take place (see Table 8.4, Menu C9).
Remote parameter setting/alerting/diagnostics
It is possible to diagnose and adjust the heat pump
by remote commands via vrDIALOG 810/2 or
vrnetDIALOG 840/2 or 860/2. You will find more de-
tailed information on this in the respective manuals.
8.3.3 Auxiliary functions via vrDIALOG
Using its computer-supported graphics visualisation and
configuration, vrDIALOG 810/2 (eBUS) enables you to
optimise heating appliances and control systems and
thus make use of their energy saving potential. Both of
them enable you to create a visual impression of the
processes in your control system and influence them at
any time. The programmes enable you to record and
graphically prepare system data, to load device configu-
rations and change and save them online and to save in-
formation in the form of reports.
Using vrDIALOG 810/2, you can make all the settings for
the heat pump as well as other settings for optimisation.
See Chap. 8.10.
Acceleration mode
This operating mode simplifies the diagnosis of heat
pump functions by speeding up the energy balancing in
hydraulic plan 1 or 3 by a factor of 60. It is used as a
test function.
See Chap. 8.10.
Fixed value controlling
Using this function you can set, via vrDIALOG, a fixed
flow temperature independently of the weather-control-
led control system. See Chap. 8.10.
8.4
Description of the controller
8.4.1 Possible
system
circuits
The controller can control the following system circuits:
- a heating circuit,
- an indirectly heated hot water storage tank,
- a hot water circulation pump,
- a buffer circuit.
In order to extend the system a buffer circuit can be
used to connect up to six additional mixer circuit mod-
ules VR 60 (accessories) each with two mixer circuits.
The controller on the operating panel of the heat pump
is used to programme the mixer circuits.
For convenient operation, you can connect the VR 90
remote control unit for the first eight heating circuits
(see Chap. 4.13).
8.4.2 Energy
balance
controller
Energy balance control is applicable only to hydraulic
systems without buffer cylinders (e.g. Hydraulic Plans
1 and 3).
For economical and fault-free operation of a heat pump,
it is important to regiment the starting of the compres-
sor. The start-up of the compressor is the point at which
the highest loading occurs. With the help of the energy
balance controller it is possible to minimise starts of the
heat pump without compromising the comfort of a
pleasant room atmosphere.
As with other weather-controlled heating controllers,
the controller determines a supply set target tempera-
ture by capturing the outside temperature by means of
a heating curve. The energy balance calculation is car-
ried out based on this supply set target temperature
and the supply real temperature the difference of which
is measured per minute and added up:
1 degree minute [°min] = 1 K temperature difference in
the course of 1 minute
Controller 8
