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D.7. TEMPERATURE SENSOR IN THERMAL STORE
Description
The lower temperature sensor in the thermal store is used for
speed control of the boiler circulation pump. The controller adjusts
the speed of the boiler circulation pump to the boiler output with
the aim to keep optimal temperature distribution in the thermal
store and at the same time to avoid boiler overheating.
To be ordered separately, code 9109.
Intended for variants
2 (mandatory accessory)
Function
The controller controls the speed of the boiler pump depending on
the difference between the temperature at the boiler flow and at
the lower sensor in the thermal store to keep the set temperature
difference.
Installation
Into the lower part of the thermal store.
Settings in controller
The S1 sensor of the temperature in the lower part of the thermal
store shall be set in menu 5.11.6.
Connecting terminal
S1
El. wiring
Permissible conductor cross section – 0,5 - 1,5 mm
2
!Max. permitted cable length for the Pt 1000 room temperature
sensor is 10 m!
Wiring diagram
!
If you decide not to install the sensor, the system will work but the
temperature distribution in the thermal store and the boiler pump control
will not be as optimal as with the sensor installed. The temperature
difference between the upper thermal store sensor and boiler sensor will
be used for control. In such a case, the upper thermal store sensor must
not be placed in a supply pipe to the thermal store but it is advisable to
place it into the upper part of the thermal store, however a bit lower. If an
electric heating element for space heating is installed, the sensor shall
be placed above it. It is recommended to set a lower DT value in param.
5.6.1.
