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Fig. 4-18 Supporting rear-facing hydraulic lines
– Connect the water for filling or refilling the heating system
as per EN 1717 so that contamination of the drinking
water due to return flow is reliably prevented.
● Connect the drain line to the safety overpressure valve and
diaphragm expansion vessel as per EN 12828.
– Check the seat of the drain hose on the pressure relief
valve.
– If necessary, connect and install a separate hose.
● Carefully insulate pipework against heat loss and to avoid
condensation (insulation thickness at least 20 mm).
– Water shortage protection: the controller's pressure and
temperature monitoring function shuts off the Daikin Altherma
M ECH
O reliably if there is a shortage of water. No additional
2
water shortage protection is needed in the construction.
– Damage due to deposits and corrosion: observe the rele-
vant technical rules to avoid corrosion products and deposits.
Minimum requirements regarding the quality of filling and sup-
plementary water:
– Water hardness (calcium and magnesium, calculated as
calcium carbonate): ≤ 3 mmol/l
– Conductivity: ≤ 1500 (ideal: ≤ 100) μS/cm
– Chloride: ≤ 250 mg/l
– Sulphate: ≤ 250 mg/l
– pH-values (heating water): 6.5 - 8.5
Measures for desalination, softening, hardness stabilisation or
other suitable conditioning measures are necessary to adhere to
the required water quality if the filling and top-up water have a
high overall hardness or other properties that deviate from the
minimum requirements.
WARNING!
There is a danger of scalding at hot water tem-
peratures over 60 °C. This is possible when
using solar energy if an external heater is con-
nected, the Legionella protection is activated, or
the target hot water temperature is set to be
greater than 60 °C.
● Install scalding protection (hot water mixing
facility (e.g. VTA32 + Screw set 1").
● Connect the drain hose to the hose connector for the safety
overflow (fig. 3-1 to fig. 3-3, item 23).
– Use transparent drain hose (draining water must be visi-
ble).
– Connect the drain hose to an adequately dimensioned
waste water installation.
– Drain should not be lockable.
Daikin Altherma M ECH
O
2
Solar storage tank with heating controller
008.1446799_00 – 07/2019 – EN
4
x
Set-up and installation
Fig. 4-19 Installation of drain hose at safety overflow
● Connect the discharge fitting on the cover (fig. 3-3, item 30)
to the waste water installation with the enclosed hose section.
● Connecting a diaphragm expansion vessel (see fig. 4-20)
– Connect a suitably dimensioned and preset diaphragm
expansion vessel for the heating system. There must not
be any hydraulic blocking elements between the heat
generator and the safety valve.
– Position the diaphragm expansion vessel in an easily
accessible place (maintenance, parts replacement)
Fig. 4-20 Mounting the diaphragm expansion vessel
Installation and maintenance instructions
21
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