Panasonic Aquarea B1 Planning And Installation Manual page 15

Product Description
CAUTION
Danger of illnesses due to growth of Legionella in water
Legionella can grow in hot water tanks, and can cause infectious diseases in humans.
► Respect European and national requirements for avoiding Legionella multiplication
(example in Germany: DVGW Worksheet W551). For domestic hot water tanks with
more than 400 litres volume as well as in buildings with more than two residential
units, there may be higher requirements than for one- and two-family houses.
CAUTION
Danger of damage to water tank due to inadequate water quality
If the contents of chloride and sulphate contents exceed 250 mg/l, water pretreatment is re-
quired. The warranty is invalidated at values above 250 mg/l.
► When using the Panasonic hot water tank, make sure that the water quality conforms
to drinking water directives 98/83/EC.
4.4.3 Cooling
The cooling mode is switched on manually through the operating panel or the wired remote
controller or automatically through defined temperature threshold values. Switching to heating
mode is also done manually at the end of the cooling period or automatically using the defined
temperature threshold.
Room cooling is possible through surface heaters such as floor and wall heaters, cooling
ceilings or particularly using fan coils. Individual heating circuits that are not suitable for cooling
mode can be disabled by control through a 2-way valve. For all transfer systems, in the cooling
mode at high humidity, the temperature on the surface could fall below the dew point, which can
cause condensation of water. This should be prevented especially in surface heaters, due to
which the water inflow temperature measured through the dew point sensor rises due to return
mixing, or the cooling mode may need to be switched off. Fan coils can be operated with much
lower water inflow temperatures, compared to the use of surface heaters for cooling mode, and
therefore have greater cooling capacities. However, fan coils for cooling mode must always be
fitted with a condensation drain and have tubes with diffusion-proof heat insulation.
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Aquarea air-to-water heat pumps - Planning and installation manual - 01/2018
CAUTION
Danger of damage to building or risk of slipping in the floor area
In the cooling mode, a drop below dew point can cause condensation of moisture from the air
on the surface of the heat transfer systems. This can damage the building or pose the risk of
slipping in the floor area.
► Prevent the temperature from dropping below the dew point by suitable placement of
dew point sensors.
► Alternatively, the condensate that forms can be safely diverted.
► In addition, insulate the pipelines concerned to prevent diffusion.
4.5 Model types
4.5.1 Split system and compact system
Difference between split system (left) and compact system (right)
1 2
4
3
1 Refrigerant circuit
2 Heating circuit (water)
3 Outdoor unit
Split system
The split system consists of an outdoor unit installed in the open air and an indoor unit, the
hydro-module or combination hydro-module, which is usually housed in the boiler room or in
another frost-free room. In this model, the two devices are linked through coolant pipes, so there
is no danger of freezing. The heat pump is operated through the operating panel on the indoor
unit.
The combination hydro-module is a space-saving combination of the hydro-module and a
high-quality stainless steel hot water tank. It can be installed quickly and smoothly, because
the internal pipes of the device unit are already laid and the pipe connections are placed on the
underside of the device.
Compact system
The compact system consists of only one device that is set up outdoors. No coolant pipes are
needed for the installation; only the heating system needs to be connected to it. Compact sys-
tems are easier to install, but need more space. Moreover, the heating water needs to be guided
out from the building envelope and can freeze in the event of power failure or if the electricity
supply is cut off by the network operator.
Aquarea air-to-water heat pumps - Planning and installation manual - 01/2018
Product Description
2
5
4 Hydro-module or combination hydro-module
5 Compact device
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