43
Water connections
Sizes 9.1~14.1
Fig. 35
6.4.4 Protection of Domestic Hot Water storage tank
When the storage tank is full, the house may not be inhabited immediately or the unit may be left o for long
periods.
In such cases it is always advisable to empty the tank to avoid water stagnation or, at suciently low
temperatures, freezing.
Do not supply the storage tank heaters with electricity if the storage tank is not full. Refer to the specific
storage tank instructions for all other details when using the manufacturer's accessories.
6.5 Pipe insulation
All the water circuit pipes must be insulated to prevent condensate from forming during cooling mode
operation, reduction of the delivery capacity and freezing of the pipes outside during winter.
The insulation material must be selected according to the requirements in the table below and be at least
class B1 fire resistant and comply with current regulations.
Pipe length (m) Minimum insulation thickness (mm)
<20 19
20 ~ 30 32
50 ~ 40 40
40 ~ 50 50
W
CAUTION
To prevent outdoor pipes from freezing, the insulation thickness must be > 13mm and have a thermal
conductivity of λ=0.039 W/mK. If the outdoor temperature is likely to be > 30°C and relative humidity > 80%,
a thickness of > 20mm should be used to prevent condensate on the outer surface of the insulation.
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