Electrical Connections; Recommendations - De Dietrich KALIKO Essentiel ETWH180E Installations- Und Wartungsanleitung

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6 Installation
6.4

Electrical connections

208
The outlet pipe in the safety valve or unit must not be blocked.
To avoid restricting the flow of water in the event of overpressure:
The discharge pipe from the safety unit must have a continuous and suf­
ficient gradient, and its cross section must be at least equal to the cross
section of the opening of the safety unit outlet (to prevent the flow of wa­
ter being hindered if the pressure is too high).
The cross section of the discharge pipe from the safety unit must be at
least equal to the cross section of the opening on the safety unit outlet
Isolation valves
Hydraulically isolate the primary and domestic circuits with stop valves to
facilitate maintenance on the water heater.
The valves make it possible to carry out maintenance on the tank and its
components without draining the entire installation.
These valves are also used to isolate the water heater when conducting a
pressurised check on the tightness of the installation if the test pressure is
greater than the admissible operating pressure for the water heater.
Caution
If the mains pipes are made of copper, fit a sleeve made of steel,
cast iron or any other insulating material between the tank's hot
water outlet and the pipes to prevent corrosion to the connection.
Connecting the domestic cold water
Make the connection to the cold water supply according to the hydraulic
installation diagram.
Install a water drain in the boiler room and a funnel-siphon for the safety
unit.
The components used for the connection to the domestic cold water
supply must comply with the prevailing standards and regulations in the
country concerned.
Pressure reducer
If the supply pressure exceeds 80% of the safety valve or unit calibration
(e.g.: 0.55 MPa/5.5 bar for a safety unit calibrated to 0.7 MPa/7 bar), a
pressure reducer must be located upstream of the appliance.
Install the pressure reducer downstream of the water meter in such a way
as to ensure the same pressure in all of the system's pipes.
6.4.1

Recommendations

Caution
Only qualified professionals may carry out electrical connections,
always with the power off.
Caution
Do not connect the power supply directly to the Peak rate/Off-
peak rate contact.
The connection is made on the terminal block.
Caution
To ensure the conformity of electrical installation, the appliance
must be powered by a circuit comprising an omnipolar switch with
an opening gap distance of more than 3 mm. The circuit must be
protected by fuses or circuit breakers calibrated according to the
output of the domestic hot water tank.
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