Technical data

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CTC EcoZenith i550 Pro
General Information
2.10 External Buffer Tank
The EcoZenith can be connected to one or more buffer tanks. This is mainly
used when connecting wood and solar energy systems where the volume in
the EcoZenith is not sufficient. Via the accessory “Charging External Storage
Tank”, warm water can be sent both from the lower tank to the buffer tank(s)
and from the buffer tank(s) back to the EcoZenith. In other words, both
charging and recharging of the energy are possible.
See also External Storage Tank Menu in the Detail Description Menus
chapter (Installer/Settings/Ext storage tank) and HP Charging Menu in
the Detail Description Menus chapter (Installer/Settings/Ext storage
tank/HP charging).
2.10.1 Solar Operation Control
When solar energy is activated, the transfer to the buffer tank(s) is performed
in two ways depending on whether heating is needed for the heating system.
When heating is not needed for the heating system, the sun charges the
EcoZenith in order to achieve a high temperature and a large quantity of
hot water. The solar panels charge the EcoZenith until the sensor of the
lower tank reaches the factory-set 80°C before the circulating pump starts
up and transfers hot water from the EcoZenith connection in the lower tank
into the top of the first buffer tank. Charging continues until the sensor in
the lower tank has fallen 3 degrees (transfer starts at 80 degrees and stops
at 77 degrees). The lower tank must be at least 7 degrees warmer than the
buffer tank for charging to be allowed to start. This applies independently of
whether there is a need for heating or not.
When there is a need to heat the house, the transfer will be controlled by
the reference value (setpoint) in the lower tank. When the sun has heated
the lower tank to 7 degrees above the reference value, the transfer starts,
provided that the lower tank is also 7 degrees warmer than the buffer tank.
Efficiency of the solar panels increases when they work towards a low water
temperature, which is the case in spring and autumn, as there is no great
need for heating during either of these seasons. The temperature levels
stated above can be adjusted.