Technical data

CTC EcoZenith i550 Pro

General Information

2.3.2 Lower tank

In the lower tank the heat pump operates to provide heat to the heating

system. Heat pump operation is of so-called ﬂoating condensation type.

However, the lower tank never drops below the set lowest temperature.

Floating condensation operation is where the heat pump heats to the

temperature required by the heating system. This temperature varies

depending on the outdoor temperature and which set inclination and

adjustment (the heat curve for the house) has been chosen. If a room sensor

is installed, this will affect the temperature required in the system. During

spring and autumn, when it is not so cold outside, a lower temperature is

needed for the heating system, but during winter a higher temperature is

needed to maintain the desired indoor temperature.

Savings from a heat pump are directly linked to the COP value. COP means

the output divided by the supplied power. COP 4 therefore means, for

instance, that the heat pump delivers 4 kW and uses 1 kW ( )

The lower the temperature the heat pump needs to deliver, the higher the

COP value obtained from the heat pump, as this will involve the compressor

working to better advantage.

Therefore, the heat pump heats only to the lower tank temperature the

heating system requires. This saves compressor life and maximizes operating

economy. The immersion heater, which is factory installed in the lower tank,

is blocked as long as the heat pump is operating.

The immersion heater is only brought into use if the heat pump is blocked for

any reason.

See also Lower tank Menu in the Detail Description Menus chapter

(Installer/Settings/Lower tank) and the DHW chapter.

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