10
C) temperature-linked circulation control and time-linked circulation control
The combination of the above functions provides for optimally triggering a circulation pump with an extremly reduced
running time.
Here the circulation pump is only switched on during a given time window and a parallel temperature undershot. It
immediately switches off when a certain temperature is reached.
3.2.8
"antifreezing protection"
(Appendix 10, illustration I)
The heat transfer medium is usually a mixture of water and a special non-toxic anti-freezing compound. Depending on
the mixture relations of the solar liquid with water anti-freezing temperatures of a minimum of –20°C are realized.
In southern European countries and in countries where the solar circuit is empty in cold periods (vacation and
weekend houses, camping facilities) water can also be used as heat transfer medium. In order to achieve a secured
anti-freezing protection the collector can be kept "on temp." through the warm storing water. If the anti-freezing
temp. is below +4°C on the sensor T1 the pump P1 switches on. The switch-off hysteresis is preset by the
manufacturer and the pump switches off when reaching a T1 temp. of +7°C.
Note:
Please only use this function when you are sure that water has been used as heat transfer medium and so
there is the danger of the solar circuit to freeze.
This function enables the operation of a solar system without anti-freezing compound only for particular appli-
cations. Technical equipment for security and measurements against freezing should be installed if necessary.
3.2.9 Manual operation of the switch outputs (
"solar loop pump"
or
"output R2"
)
(Appendix 10, illustrations L and M)
For maintenance and repair works the switch outputs R1 (solar loop pump) and R2 can be used manually. After
selecting output R1 or R2 within the submenu
"MAN.OPERATION"
press OK for 2 sec to achieve another switch status.
This status remains until the submenu manual operation is left by pushing the menu button.
Attention:
Only after leaving the submenu manual operation does the controller switch over to automatic operation and
considers current system parameters and configurated readings.
So it is inevitable to quit this menu after maintenance and repair works.
3.3
Monitoring and control function
Function overview
operating status solar circulation pump
calorimetry
operating hours solar circulation pump
minimum and maximum temperature storage
automatic temp. sensor recognition (PT 1000 or KTY81-210)
temp. sensor control and diagnosis of errors
excess temp. indication in the case of an all-too high temp. difference
3.3.1 Operating status solar circulation pump
OK
Menu
Operating status display for
the switch outputs
The LCD display indicates the operating status of the solar circulation pump by
showing the sign . The symbol is visible in all menus and only refers to the
solar circulation pump. During pump operation the indication symbol changes.
3.3.2
Calorimetry (Appendix 10, illustration J)
The solar energy fed into the service water tank is registered and permanently
summed up by a volume measuring unit with pulse output V1 and the temp.
difference between solar foward and backward movement (sensors T4 and T5). In
addition the user has the possibility to register the heat quantity over any period of
time and to reset this value again by pressing OK for 2 sec.
A temperature-linked density and heat capacity are corrected within the
microprocessor controler´s counter. The cumulated heat quantity is indicated on
the LCD display. Various proportion of mixes of anti-freezing compounds and
water can be configurated via operating menu.
If the thermostat function
"temperature-linked circulation control"
is selected
(paragraph 3.2.7) there is an automatic restriction in measuring the heat quantity
by temp. sensors T1 and T5. This is due to the fact that otherwise the temp. sensor
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