Potentiometers:
When changing the value on the potentiometers, the controller shows the value
on its display in the corresponding unit. At its basic state, it shows the temperature
measured in the solar thermal collector and water tank.
ŸThe function of the T_OFF potentiometer is to set the delay time for the pump
switch off. This starts from the moment when the temperature is equalized, in
order to achieve that hot water flows through the storage tank heat exchanger
without having it stuck in the pipe. It can be set from 0 to 20 sec.
ŸThe Diff_Temp potentiometer sets the difference between the temperatures of
the solar thermal collector and of the water tank. When this difference reaches
the given value, then the controller switches the pump on. It can be set from 0 to
22 °C.
ŸThe Start_Temp potentiometer sets the starting temperature for controlling the
system. The temperature of the collector has to be higher then the given starting
temperature in order to start the pump, even if the difference between the
temperatures of the collector and of the water tank is high enough. It can be set
from 0 to 40 °C.
The controller has no buttons and menu to avoid changing the settings by non-
technicians/non-professional personnel. However, by removing the front cover,
the technician/professional personnel can adjust the settings with the
potentiometers and jumpers.
It has two inputs. Both are PT1000 probe, one entering the solar systems, the
other one entering the water tank. It has one output to switch the heat pump. The
controller is supplied by the grid from 150V to 240V AC.
Description of the controller
Levtech Service & Prodtuction SRL
Lueta Nr. 319, Romania
+40758576007
www.levtech.ro
