Iv.b) Main Menu - Flowchart; Iv.c) Operation Mode; Iv.c.1) Automatic Operation; Iv.c.2) Collector Defrosting - TECH ST-401N PWM User Manual

IV.b) Main Menu – Flowchart
Due to its multifunctional nature, the controller's menu is divided into the Main Menu and the Service
Menu.
The Main Menu is used to adjust the controller's basic options such as changing the operation modes,
timer settings, date settings, changing the language etc. The layout of parameters in the Main Menu is
shown by the flowchart below.
*Parameter visible if an additional device (i.e. a heater) is connected.

IV.c) Operation Mode

Using this function, the user selects the operation mode.

IV.c.1) Automatic Operation

The pump operates during the Automatic Operation mode if the minimum difference of temperatures
between the collector and the tank is reached (the difference between these temperatures when the
pump is activated is determined by the function "Solar Pump Activation Delta" in: SERVICE MENU >
Pumps > Solar Pump Activation Delta).
The pump will operate until the set temperature is reached (the set temperature is adjusted in:
SERVICE MENU > Accumulation Tank > Set Temperature) or until the difference of temperatures
between the collector and the tank reaches the deactivation delta threshold: SERVICE MENU > Pumps
> Solar Pump Deactivation Delta (in this case, the pump will be activated again when the temperature
on the collector increases above the tank's temperature by the Solar Pump Activation Delta). When the
pump is deactivated after reaching the set temperature, it will be activated again if the temperature
drops below the set value by the amount specified by the Tank's Hysteresis (the hysteresis value is
adjusted in: SERVICE MENU > Accumulation Tank > Tank Hysteresis).

IV.c.2) Collector Defrosting

Using this mode, the user may manually activate the collector's pump in order to melt the snow on the
solar panels. After activation, this mode is active throughout a period of time defined by the user and
then the controller returns to its automatic operation (the defrosting time is set in: SERVICE MENU>
Solar Collector > Defrosting Time). This function may be switched off manually after a shorter operation
time by selecting a different operation mode.
Operation Mode
Timer
Date
Ethernet Module
GSM
Statistics
Backlight
Display Contrast
Language
Information
Factory Settings
Service Menu
Automatic Operation
Collector Defrosting
Holiday Mode
Anti-Legionella*
Manual Operation
Activate
IP Address
Reset Module Password
Advanced Settings
Information
Activate
Information
Gain
Collector Overheat
Power Supply Failures
Tech
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