Electrical Connection - Bandini SE 20 Manual De Instrucciones

lation of a pressure reducer on the outlet of the water meter and in any case as far as much is possible
form the water heater.A pressure reducer installed close to the appliance (below 10 m) require the instal-
lation of an expansion vessel on the inlet tube of cold water next the appliance.During the heating phase
a slight drip of the safety valve is quite normal due to the increase of pressure into the boiler. Hence is
necessary to connect the drain outlet of the valve ( fig.2) to a drain pipe installed inclined continuously
downward, place without condensation and always open. The safety valve against overpressure should
be operated regularly in order to remove lime scale and verify the correct operation.
Connect the outlet tube of the boiler with red collar to the services by flexible pipe.
1.3 thermo electric (indirect) version
Appliances in the version with fixed coil (thermoelectric) can integrate domestic hot water heating throu-
gh the heating system. They must be connected like a normal heating element – see connection dia-
gram (fig. 6).

1.4 Electrical connection

If the appliance is not equipped with electrical cable is necessary connect it to the main electrical supply
with rigid cable for fix connection. Before connect the appliance verify that the supply tension is right
with the appliance value.
In the electric power supply circuit of the water heater must be fitted with a device assuring the interrup-
tion of all poles in the conditions of overvoltage category III.
The connection must be done according to the wiring diagram:
R = electric heating element
S1, S2 = thermostat contacts
TS = thermostat safety device
TR = contact operated
L-N = power supply line
SP = indicator light
L1, L2 = electric line connection terminal = earth
To install the power supply wire to the boiler remove the plastic cover and insert the wire in the hole on
the plastic cap. The electrical connection is carried out directly to the clamps
( Fig. 4-5 L/N ) of the thermostat.
To disconnect the unit form the main electrical supply use a bipolar switch conform to EN-IEC
standards (contact opening at least 3 mm, better if equipped with fuses). The earth connection is man-
datory and the earth cable (must be yellow-green and longer than that of the phases) is fixed to the
terminal marked by symbol (fig. 7).
After the installation, put the plastic cover back in its place.
2. PUTTING IT INTO SERVICE AND TESTING
Before connecting the electrical supply, ll the appliance with water. To do this open the main tap of the
plumbing system and then open the hot water tap. Expect the discharge of water form hot water tap
and hold for few seconds in order to permit the discharge of the air inside the pipes. Check carefully for
eventually leak. Close the hot water tap and switch on the electrical supply.
3. USER INSTRUCTIONS (by the user)
WARNING. Follow the general warnings and the safety norms listed at the beginning of the text and
keepall the instructions given under all circumstances.
3.1 Advice for user
Avoid positioning any objects and/or appliances that could be damaged by water leaks beneath the
water heater.
Should you not use any water for an extended period of time, you should:
• disconnect the appliance from the electrical supply by switching the external switch "OFF".
• turn off the plumbing circuit taps.
• hot water at above 50°C flowing out of the taps at the point of use could cause serious scalds or even
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