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1.2. Technical data
1.2.1. General
The heat pump water heater is composed of a water tank, a refrigerant circuit, a cabi-
net and a display connected to a control board. The main scope of the appliance is to
heat water stored in a tank.
1.2.2. Operation
The unit is programmed to start heating the water inside the tank when its tempera-
ture falls below a predetermined level. The unit stops when the water temperature
reaches a set point that can be regulated by the user. In general, the appliance is
designed to produce enough hot water to cover the need of a household of 4 persons
or more.
There are two ways in which the unit can heat the water:
1) Heat pump operation
In the operation with heat pump, a efrigeration cycle utilizes the operation of a com-
pressor and the extraction of heat from the air to heat the water in the tank. This is
the standard way used to heat the domestic hot water, since it leads to lower electric-
ity consumption, hence also lower running costs.
More information regarding the heat pump operation and the cooling circuit can be
found in paragraph 1.2.3.
2) Electric heater operation
The water is heated using an electric heater. An electric resistance is powered to heat
the water in a safe, fast and flexible way. However, using the electric heater can
become an expensive way to produce hot water. This operation should be used as a
back-up or as integration of the standard operation.
The electric heater is activated in case of:
• Failure of the heat pump operation.
• Too high or too low air temperatures.
• The quantity of hot water produced is not enough.