7
Apart from this the controller allows for registrating the calorimetry fed into the service water storage basin by an
additional volume flow dispenser and the temperatures in the solar forward and backward movement. The volume
flow dispenser is a traditional water meter with pulse output point. It is important that the volume flow dispenser
resists the higher temperatures within the solar circuit. This is the reason why you should not use cold water but warm
or hot water meters sold by authorized dealers.
3.2 Regulation
function
Function overview
"ON" and "OFF function" of the temp. difference regulation
(menu
"On-temperature difference"
= ON-Tdiff; menu
"Off-temperature difference"
= OFF-TDiff)
menu
"speed control"
of the solar circulation pump
"storage tank temperature limitation"
(menu
"storage temp. limitation"
)
"collector temperature limitation"
(menu
"collector temp. limitation"
)
Thermostat functions
(due to software lock only one function to be selected)
y
menu
"storage tank cooling"
y
temperature
and time-linked
"heating system"
(menu
"heating system"
)
y
temperature
and time-linked "circulation control"
(menu
"temp.-linked circulat. contr."
, menu
"time-linked
circulat. contr."
)
menu
"antifreezing protection"
"Manual operation"
of the switch outputs (menu
"MAN.OPERATION"
)
3.2.1
"On-temperature difference"
and
"Off-temperature difference"
function of the temperature
difference regulation (Appendix 10, illustration A)
The solar circulation pump P1 is switched on by a temp. difference function. As soon
as the collector temp T1 is a certain temperature difference (to be adjusted within
the menu parameter "On-temperature difference"
higher than the sensor`s "storage
tank bottom" T2 temp. the circulation pump will be switched on.
In order to avoid a permanent ON and OFF of the solar circulation pump it only
switches off automatically after falling below an adjusted temperature difference (to
be configurated within the menu parameter "Off-temperature difference").
Example:
The parameter value of the switch-on temperature difference is 8 Celvin, the
parameter value of the switch-off temp. is 4 Celvin. On the point of measurement at
the bottom of the storage tank (T2) 20°C are registered, i. e. in this case the solar
circulation pump will be switched on at a collector temp. of 28°C and will be
switched off at a collector temp of 24°C.
IMPORTANT:
The preset values of the switch-on (8 Celvin) and switch-off (4 Celvin) temperature difference have been proven
standard configuration for years. Changing these values is thus only necessary in exceptionate situations, e. g. long
pipeline distances. Switch-on and switch-off temperature differences are interlocked. Both values can be adjusted to a
maximum of 2 Celvin against each other so that misconfiguration are avoided.
3.2.2
"speed control"
of the solar circulation pump (Appendix 10, Illustration B)
The controller has an electronic relay for the regulation of a circulation pump´s speed (P1) within the solar circuit. By
regulation this speed the temperature difference between collector and storage tank is to be kept on a constant level.
When using solar circulation pumps with changeable cycle speed stages the highest stage (in most cases stage 3)
should be adjusted. This adjustment is done directly by moving the pump speed switch. The speed regulation
automatically adjusts the necessary performance.
The regulating performance of the speed control corresponds to a "PI" controller (proportional integral controller). The
"P" part serves for a fast stabilisation of the regulation process and "I" part serves for a fast achievement of the preset
set point. This controller is – due to its precise adjustment – extraordinarily rugged and it is not necessary for the user
to conduct any detailed configuration.
Nevertheless, you have the possibility to switch off the speed control within the menu functions “speed control”. Then
the controller works just as a traditional temp. difference controller and takes care that the circulation pump delivers a
constant volume flow (if the switch-on conditions are fulfilled).
Содержание Suntana
Страница 25: ...700676...
