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User, Installations and Maintenance Manual
1.5 HYDRAULIC CONNECTIONS WARNINGS
It is mandatory that the installation complies with part G3 of the Building Regulations. For that the unit is factory
equipped with a T/P safety relief valve (set = 90°C/7bar) and is supplied with a G3 kit composed by expansion
vessel, PRSV device to be installed at the water inlet of the unit and that integrates a check-valve, a water
pressure reducer (default set = 3,5bar), a water safety relief valve (set=6bar).
The outlet connection of both safety relief valves must be connected to a tundish. The discharge pipes from
safety devices (tundish) must be installed to fully comply with Part G3 of the Building Regulations (latest edition).
The minimum inlet water pressure for the correct operation of the appliance is 0.15 MPa (1.5 bar).
Connect a rubber pipe to the condensate drain, taking care not to force too much so as not to break the drain
pipe and refer to “7.6.1 Condensate drain connection" on page 20".
Use only connecting pipes (not supplied), rigid and resistant to electrolysis both at the inlet of cold water and at
the outlet of hot water from the device.
For models that incorporate a heat exchanger (solar coil), the circuit must not exceed 1.0 MPa (10 bar) and its
temperature must not exceed 80°C.
Refer to description and illustrations in the “7.5 Hydraulic connections" on page 17 and “7.7 Integration with
solar thermal system (only for EKHHEU200PCV37 and EKHHEU260PCV37 models)" on page 20.
1.6 ELECTRICAL CONNECTIONS WARNINGS
The appliance shall be installed in accordance with national wiring regulations.
The electrical installation must include an all-pole disconnection with a separation of the contacts on all poles
capable of guaranteeing complete disconnection in the overvoltage category III upstream of the appliance,
complying with local installation rules in force .
The device must be protected by an adequate differential switch (max 30 mA). The type of differential switch
should be selected by assessing the type of electrical devices used by the system as a whole.
Earth connection is mandatory. The manufacturer of the appliance shall not be held liable for any damage
caused by failure to earth the system or due to anomalies in the electric power supply.
It is strictly forbidden to connect the appliance at the AC mains through extensions or by a power strip.
Before taking off the cover, make sure that the power is turned off to prevent injury or electric shock.
Refer to description and illustrations, respectively, in the “7.8 Electrical connections" on page 21 and “7.9
Wiring diagram" on page 23.
