Tech Controllers EU-800 PID User Manual page 19

6.1.1.6 WEATHER-BASED CONTROL
VALVE 1,2
For the function of weather control to be active, the external sensor mustn't be exposed to sunlight or influenced by weather
conditions. After it has been installed and connected, weather-based control function needs to be activated in the controller
menu.
This setting is not available in the cooling mode or in the return protection mode.
6.1.1.6.1 Heating curve
Heating curve – a curve according to which the pre-set controller
temperature is determined, on the basis of outside temperature. In order
for the valve to operate properly, the user defines the pre-set
temperature value (downstream of the valve) for respective values of
outside temperatures -20°C, -10°C, 0°C and 10°C.
6.1.1.7 VALVE PUMP
VALVE 1,2
6.1.1.7.1 Valve pump
This option enables the user to select the pump operation mode:
• Always ON – the pump operates all the time, regardless of temperatures.
• Always OFF – the pump is switched off permanently and the regulator controls only the valve operation.
• ON above threshold – the pump is activated above the switch-on temperature. If the pump is to be activated above the
threshold, the user should also define the threshold pump switch-on temperature. The controller uses the readings from CH
temperature sensor.
6.1.1.7.2 Pump activation
This option concerns the pump activated above threshold. The valve pump will be activated when the CH boiler sensor reaches
the pump switch-on temperature.
6.1.1.8 RETURN PROTECTION
This function allows setting up CH boiler protection against too cool water returning from the main circulation, which could
cause low-temperature boiler corrosion. The return protection involves closing the valve when the temperature is too low, until
the short circulation of the boiler reaches the appropriate temperature.
ON/OFF
WEATHER-
BASED
CONTROL
Heating curve
Valve pump
VALVE
PUMP
Valve activation
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