Pipework; Temperature Sensors - Würth LATENTO XXL 300 Instrucciones De Montaje

6.3 Pipework

Caution
A thermal mixing valve (Item no. 878 700 021) must be installed to the hot water
outlet of the domestic water heat exchanger so as to prevent scalds. The hot water
heat exchanger should be 60 °C according to DIN EN 806-2 (June 2005).
Keeping heat-losses of the hot water tube as low as can be, we recommend you
to limit the thermal mixing valve to 45 °C–50 °C hot water temperature. Should
thermal disinfection become necessary, you may set the mixing valve to 70 °C.
Caution
Note
Pressurised flushing connections must be installed in front of the thermal mixer for
the flushing and for any descaling of the drinking water heat exchanger that may
be necessary. If water hardness exceeds 20° dH (3,57 mmol), we recommend to
install a water softening device to avoid an efficiency loss due to limescale in the
heat exchangers.

Temperature Sensors

Position the temperature sensors into the sensors glands at the level so indicated
in the installation proposal and connect the sensors to the regulation unit. The sen-
sor glands have been dimensioned such that several sensors can be inserted into
one sensor gland.
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Heed the regulations of the local water distribution company
and relevant DIN standards when connecting. The connections
must be made pressure-tight. The componenttested safety instal-
lations have to be installed according to DIN 4753, Part 1,
para. 6.3-7 (safety valve, reflux valve, pressure reducing valve,
drainage, control and safety device).
The heating installation must be pressure-checked and flushed
due to DIN EN 14336.
The DHW heat exchanger must only be charged with a pres-
sure of max. 15 bar. The heat exchanger would expand if the
water pressure exceeded 15 bar. The LATENTO XXL might get
damaged because of this.
Due to DIN EN 12502, there is a max. chloride concentra-
tion of water of 53 mg/l (warm water) respectively, to be
kept. Otherwise there may be hole-/grid-corrosion in the heat
exchanger.