Technical data

17
CTC EcoZenith i550 Pro
General Information
2.5 Additional boiler (pellets, oil, gas,
electricity)
The EcoZenith can control an external additional boiler (pellets, oil, gas,
electricity). The additional boiler is connected to the upper tank. Use the
menu to select whether the external additional boiler should have high or low
priority. If high priority is selected, the external additional boiler is activated
before the immersion heater(s); when low priority is selected, the immersion
heater(s) is/are activated first.
After a certain delay, which is factory set at 120 minutes, the unit with low
priority is also started and helps the heat source with high priority.
If the immersion heater(s) has low priority, the following requirement has to be
met before they are allowed to start: the temperature inside the upper tank
has to fall 4°C below the set point. If the external boiler has the low priority,
the following requirement has to be met before the external boiler is allowed
to start: the temperature inside the upper tank shall fall 3°C below the set
point of the additional heating source and the immersion heater(s); should
reached the desired value (100% of the set value), or to reached 6 kW the
first 2 hours after a power failure.
The charge pump between the external boiler and EcoZenith is controlled by
CTC EcoZenith.
The charge pump will start when the external boiler is needed. If the external
boiler temperature sensor is installed and the external boiler is defined, the
charge pump starts when the external boiler reaches its set temperature
(factory set 30°C).The charge pump will stop when there is no need of
external boiler. A stop delay of the charge pump can be set; making the
charge pump running a while after the external boiler has been stopped.
See also External Boiler Menu in the Detail Description Menus chapter
(Installer/Settings/Ext boiler)