DeDietrich BL 150, Инструкция по установке, эксплуатации и обслуживанию

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Pressure reducer
If the mains pressure exceeds 80% of the valve or safety unit setpoint
(e.g.: 5.5 bar for a safety unit set at 7 bar), a pressure reducer must
be fitted upstream of the appliance. Install the pressure reducer
downstream the water meter in such a way as to ensure the same
pressure in all of the installation pipes.
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Domestic hot water circulation loop
To guarantee the availability of hot water as soon as the taps are
turned on, a circulation loop between the draw-off points and the
recirculation pipes in the DHW tank can be installed. A non-return
valve must be included in this loop.
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Measures to take to prevent hot water flow reversal
Fit a one-way valve to the domestic cold water circuit.
4.7 Electrical connections
4.7.1. Recommendations
WARNING
Only qualified professionnals may carry out electrical
connections, always with the power off.
4. Installation BL 150...500
17 01/03/2011 - 300019417-001-C