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Principle of operation

EU-427i (ST-427i) regulator is intended to control the operation of three pumps. The controller's task is to switch the pumps on (temporarily if the temperature exceeds the threshold value of activation) and off when the boiler cools down (e.g. as a result of burnout). If a selected pump is not a CH pump, apart from activation temperature, the user adjusts the set temperature up to which the pump will operate. There is a possibility to set any priorities of the pumps' operation.

Functions performed by the controller:

control of three pumps on the basis of the measurement of temperatures or on a time basis
anti-stop function
anti-freeze function
the possibility of setting any priorities of pumps
the possibility of connecting room regulator

Equipment of controller:

LCD display
three temperature sensors
knob of the pulse generator
casing made of high quality materials resistant to high and low temperatures

Specifications	Unit
Power supply	V	230V/50Hz +/-10%
Maximum power consumption of the controller	W	4
Ambient temperature	°C	5÷50
Maximum output load of the pump	A	1
CH temperature range	°C	30÷75
CH temperature range	°C	20÷75
Floor temperature range	°C	30÷75
Hysteresis	°C	1÷30
Accuracy of measurement	°C	1
Thermal resistance of the sensor	°C	-25÷90
Fuse-link	A	3,15

Sample schemes of connections:

* Schematic diagram, schematic design does not replace the heating system.
In the diagram shown the heating elements do not shut off and security for the performance of its professional installation.

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