Operation Control - Tech Controllers EU-i-2 Plus OT User Manual

8.

OPERATION CONTROL

The algorithm is based on the readings from one temperature sensor. The device connected to the additional contact will
be used to control the operation of a different contact, DHW pump or room regulators. The device connected to the
contact will be enabled when the controlled contact is switched on and the selected sensor fails to reach the pre-set
temperature when the delay time is over. It will be disabled when the controlled contact switches off or when the selected
sensor reaches the pre-set temperature. When the pre-set temperature is reached and the temperature drops again below
the hysteresis, the device will be enabled after the time defined as delay after error is over.
•
Pre-set – the user may define the pre-set temperature value for the selected sensor.
•
Hysteresis - the user may set the temperature value below which the contact will be enabled, taking into account
the pre-set temperature (Pre-set temperature-Hysteresis).
•
Delay – the user may set the delay time after which the contact will be enabled.
•
Delay after error - the user may set the delay time after which the contact will be enabled if the temperature
drops again.
•
Sensor - the user may select the sensor which will be used to control the contact operation.
•
Additional contact - the user may select the device to be controlled - additional contact, DHW pump or room
regulator.
•
Weekly control - the user may define the time and days when the operation control function will be active.
Example:
Part of the heating system is handled by 2 CH boilers and a buffer. The task of the boilers is to heat the water in the buffer.
Boiler is connected to voltage-free contact 2 with operation control function. The other boiler is connected to voltage-
free contact 3 with buffer function. Buffer temperature is read by sensor T4 (CH). Additional contact supporting the boiler
will be used to control the operation of the other boiler. If the controlled device does not get activated and the selected
sensor fails to reach the pre-set temperature within the delay time, the controller will activate the device connected to
the controlling contact.
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