Tech
-
25
-
V. Updating Software
NOTE
New software may be uploaded to the controller only by a qualified fitter. After the software is changed,
it is not possible to restore the previous settings.
In order to upload new software, the controller should be disconnected from the power supply. A USB
flash drive with new software should be inserted to the USB port. Then, the controller should be
connected to the power supply while holding the MENU button all the time. The MENU button should
be held until a single sound signal is heard – this means that the new software is being uploaded.
VI. Maintenance
Before and during the heating season, the
ST-402N
controller should be checked for the condition of
its cables. The user should also check if the controller is properly mounted and clean it if dusty or dirty.
Technical Data of ST-402N Controller
Power Supply Voltage
230V/50Hz +/-10%
Temperature Adjustment Range
8°C: 90°C
Power Consumption
max. 4W
Temperature Strength of PT 1000 Sensors
-30°C: 200°C
Measurement Accuracy
1°C
Ambient Temperature
5°C: 50°C
Load at Each Outlet
1A
Fuse Insert
3,15A
VII. Assembly
NOTE:
The device should be installed by a qualified electrician. Make sure that the plug is disconnected from
the power supply at that time.
CAUTION
The cable to the temperature sensor should be led in a shield and should be protected against weather
factors. The cable for connection to the solar controller should be permanent, made under a roof and
well insulated. Metal elements of the sensor and the collector installation should be earthed.
Schematic Diagram of the Collector Installation