CTC Union EcoZenith i550 Pro, Installation And Maintenance Manual

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13 CTC EcoZenith i550 Pro
General Information
upper tank
lower tank
port 1
port 2
2.3 Heat pump
The EcoZenith is designed with two parts in order to ensure the heat pump
operates to maximum possible economy.
The heat pump is connected via two diverting valves to the EcoZenith and
ensures that the heat is directed into the upper and lower tanks, respectively.
For instance, when the heat pump pumps towards the upper tank, the
diverting valves send the flow to the two uppermost connections, so that the
flow enters port 1 and exits through port 2.
The heat pump operates in two different ways, depending on whether it is
the upper tank or the lower tank being charged.
2.3.1 Upper tank
The final hot water heating takes place in the upper tank. This means that,
with a high upper tank temperature, an ample hot water supply is obtained.
The upper tank has a factory-set stop temperature of 55°C, which means
that the heat pump will work to achieve this temperature in the upper tank.
When hot water is being drawn off and the temperature in the upper tank
falls to 5°C below the stop temperature, the heat pump starts up and raises
the temperature towards the set stop temperature.
The stop temperature can be adapted to hot water needs and to the heat
pump model installed.
When there is also a need for heat in the house, the diverting valves will
automatically reverse direction and the heat pump continues to heat the
lower tank as soon as the stop temperature 55°C in the upper tank has
been reached. If the upper tank has not reached the stop temperature 55°C
within the factory-set 20 minutes of charging, the diverting valves reverse the
direction and the heat pump charges the lower tank. This is to prevent loss
of temperature in the heating system.
See also Upper tank Menu in the Detail Description Menus chapter
(Installer/Settings/Upper tank)