Water Heating - Panasonic WH-SDF03E3E5 Series Design Handbook

2.3.2 Water heating

Note
Attention
Aquarea air / water heat pump – design handbook 07 / 2014
The Aquarea heat pump has a water heating operation integrated within
the control system. Upon demand, the water heating operation is
switched on and heats the hot water tank via a 3-way directional valve.
Since the required temperature for water heating in general lies above
the temperature of the heating operation over the year, the coefficient of
performance (COP) is low in the water heating mode in comparison to
the heating mode. For efficiency reasons, the hot water storage temper-
ature is therefore set below 60 °C. A hot water temperature of 45 to 50 °C
is sufficient for normal applications and is not at all connected with
reduced comfort. However with lower stored temperatures, attention
must be paid to the danger of legionella which especially thrive within
the range 30 to 45 °C.
The Panasonic hot water cyinders are equipped with an electric immersion
heater which can be activated for legionella control, on a periodic timer
basis .
Aquarea heat pumps can be combined easily with solar thermal installa-
tions, which can largely take over water heating in the summer months.
The requirments for the control of legionella propagation in the work-
place are described in HSE guide L8
When using the Panasonic hot water tank, the quality of water must
comply with the potable water directive 98/83/EC. When the chloride
and sulphate content exceeds 250 mg / l, water treatment is required.
For values above 250 mg / l the guarantee expires.
Water regulations must be considered at all times when installing an
Aquarea heat pump.
Heat pump system
Heat utilisation
Water heating
15