Functional description
Installation instructions VRC 470 0020116690_00
35
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8.6.7 Reading the runtime of the solar pump
Menu ¬ Installer level ¬ System configuration
[Solar ----] ¬ Solar pump runtime
Only with a connected VR 68/2
This function allows you to read the measured operating
hours of the solar pump since start-up or since the last
reset.
8.6.8 Resetting the runtime measurement of the
solar pump
Menu ¬ Installer level ¬ System configuration
[Solar ----] ¬ Reset solar runtime
Only with a connected VR 68/2
This function allows you to set the totalled operating
time in hours of the runtime measurement for the solar
pump back to 0.
8.6.9
Activating the solar pump on temperature
difference control
Menu ¬ Installer level ¬ System configuration
[Solar ----] ¬ Pump control
Only with a connected VR 68/2
This function allows you to keep the solar circuit at the
activation value, and thus in operation, for as long as
possible. For this purpose the pump is switched on and
off in periodical bursts depending on the collector tem-
perature and "lower cylinder temperature".
On reaching the on temperature difference, the function
is started with an activation duration of 30 % - i.e. the
pump is switched on for 18 s and then switched off for
42 s.
As the temperature difference increases, the activation
duration is increased (e.g. 45 s on, 15 s off). As the tem-
perature difference decreases, the activation duration is
decreased (e.g. 20 s on, 40 s off). The period length is
always a minute.
i
Does not apply in combination with a VMS
solar station.
8.6.10 Defining the priority for charging the
domestic hot water cylinder
Menu ¬ Installer level ¬ System configuration
[Solar ----] ¬ Lead cylinder
Only with a connected VR 68/2
In systems with more than one solar charged domestic
hot water cylinder, the lead cylinder is charged as a pri-
ority. With this function you can define a lead cylinder.
1 = Cylinder 1 is the cylinder with cylinder sensor SP1
2 = Cylinder 2 is the cylinder with cylinder sensor TD1
This function is only effective if you set "Cylinder 2"
for the multi relay when making the setting
(
¬
Sec-
tion 8.6.12)
.
8.6.11 Setting the flow volume of the solar circuit
Menu ¬ Installer level ¬ System configuration
[Solar ----] ¬ Solar flow volume
Only with a connected VR 68/2
This function allows you to set the flow volume for the
solar circuit. The correct setting of the flow volume is
required so that the solar gain can be determined
correctly.
The setting of the flow rate depends on the setting of
the solar pump. An incorrect setting results in an inaccu-
rate calculation of the solar gain.
8.6.12
Defining the setting for multi relay
Menu ¬ Installer level ¬ System configuration
[Solar ----] ¬ Multi relay
Only with a connected VR 68/2
This function allows you to define if, depending on the
installed hydraulic scheme, a difference control should
be performed or if the second cylinder should be
charged.
8.6.13
Activating the solar pump kick
Menu ¬ Installer level ¬ System configuration
[Solar ----] ¬ Solar pump kick
Only with a connected VR 68/2
This function allows you to activate a pump kick for the
solar pump, in order to speed up the temperature
recording of the collector temperature.
Depending on the design, there is a time delay in some
collectors during calculation of the measured value for
temperature recording. With the solar pump kick func-
tion, you can reduce the time delay.
When the solar pump kick function is activated, the solar
pump is switched on for 15 s (solar pump kick), when the
temperature at the collector sensor has risen by
2 K/hour. This transports the heated solar fluid to the
point of measurement more quickly.
If the temperature difference between the collector and
the cylinder exceeds the preset switch-on difference, the
solar pump runs for an appropriate length of time to
heat up the cylinder (difference control).
8.6.14
Setting the solar circuit protection
Menu ¬ Installer level ¬ System configuration
[Solar ----] ¬ Solar circuit prot.
Only with a connected VR 68/2
