Operation Mode; Additional Contacts; Select Sensor; Main Boiler - Tech Controllers EU-i-3 User Manual

2.

OPERATION MODE

Pre-set temperature – the cascade will operate on the basis of the readings from the selected source sensor and
•
the pre-set temperature.
Go to Additional contacts and select the additional contacts working in a cascade. Next, configure the pre-set
temperature and hysteresis and select the source sensor. When the temperature measured by the source sensor
drops (Pre-set temp. - Hysteresis), the first contact will be enabled (according to the selected operation
algorithm). The contact will operate for the pre-set pause time. When the pause time is over, another contact
will be enabled (according to the selected operation algorithm). Operation time works similarly to pause time.
When the heat source temperature has been reached when the operation time is over, the contacts will be
disabled one by one.
Heating need – The algorithm is based on the readings from one temperature sensor.
•
The first contact selected in Additional contacts will be enabled when the temperature measured by the selected
sensor drops below the highest pre-set temperature by the hysteresis of the selected circuits with a valve. It is
also possible to select DHW circuit - the device will be enabled when the temperature drops by the value of DHW
hysteresis. Within the range of pre-set temperature reduced by hysteresis (Pre-set temp. - Hysteresis) and the
pre-set temperature next contacts will not be enabled - the contacts' operation will be maintained without
activating next contacts. When the temperature drops below the pre-set value by hysteresis, the contacts are
activated one by one, according to pause time parameter. When the source sensor exceeds the pre-set
temperature by the value of overheating, the contacts will be disabled one by one, according to operation time
parameter.
If all selected circuits report no heating need, all contacts will be disabled at once, regardless of the operation
time.
Weather-based control - This operation mode depends on the outside temperature.
•
The user defines temperature ranges and a corresponding number of boilers which will be enabled (Fitter's menu
> Cascade > Weather-based control > CH boiler activation temperature 1-4).
3.

ADDITIONAL CONTACTS

All contacts may operate in a cascade. This option enables the user to select particular contacts for a cascade.
4.

SELECT SENSOR

The user may select the sensor which will provide temperature readings for the cascade.
5.

MAIN BOILER

If Main boiler option is selected in a given contact (optional), in every operation mode this contact will be enabled as the
first one and disabled as the last one. Only in Heating need mode, when all selected circuits report no heating need, all
contacts will be disabled at the same time.
6.

RESET MOTOHOURS

It is possible to reset the motohours for all contacts: Fitter's menu > Cascade > Reset motohours.
7.

FACTORY SETTINGS

This function enables the user to restore factory settings of the cascade algorithm.
40