7
Operating principle
All heating and domestic hot water functions offered by SATK30
series HIUs are controlled by a digital temperature regulator.
Automatic controller functions
• Reset diverter/modulating valve to zero
Immediately after the power supply has been switched on, the
position of the modulating valves is reset to zero.
• Pump anti-seizing
When the pump is not in use, it is powered on for a period of
5 seconds every 24 hours.
Diverter/modulating anti-seizing cycle
The anti-seizing cycle for the diverter/modulating valve is run every
24 hours.
• LCD display
Shows programmed set-point temperatures and error codes.
88
• Trimmers for set point settings
They allow the setting of the temperature set-point for the operating
cycles and view the relative value on the display.
• Dip switches
Allow set-up of the various models and enabling of optional
functions
User interface
The user interface, built into the PCB, consists of the following
devices:
• LED indicator
The various functions and faults are signalled by either flashing or
steady illumination of the LEDs.
ON
-
Electric supply 230 V (ac)
DHW -
Domestic cycle
CH
-
Heating cycle
FAULT -
Fault detected
Heating cycle
Electronic regulator
1
2
3
4
5
6
Not used
• RESET key
This allows restoration of normal function after the safety thermostat
has been triggered and activation/deactivation of the floor slab
heating function.
