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5.12
Electrical wiring
Notes on safety for the electrical wiring
The electrical wiring must be carried out with the electrical supply disconnected.
Electrical wiring must be made in accordance with the regulations currently in force in the country of destination
and by qualified personnel. Refer to the wiring diagrams.
The manufacturer declines all responsibility for modifications or connections different from those shown in the wir-
DANGER
ing diagrams.
Check that the electrical supply of the burner corresponds to that shown on the identification label and in this man-
ual.
The burners have been set for intermittent operation. This means it should compulsorily be stopped at least once
every 24 hours to enable the flame control to check its own efficiency at start-up. Normally the boiler's thermostat/
pressure switch ensures that the burner stops. If this is not the case, a time switch (IN) should be fitted in series to
provide for burner shut-down at least once every 24 hours. Refer to the wiring diagrams.
The electrical safety of the device is obtained only when it is correctly connected to an efficient earthing system,
made according to current standards. It is necessary to check this fundamental safety requirement. In the event of
doubt, have the electrical system checked by qualified personnel. Do not use the gas tubes as an earthing system
for electrical devices.
The electrical system must be suitable for the maximum power absorption of the device, as indicated on the label
and in the manual, checking in particular that the section of the cables is suitable for that level of power absorp-
tion.
For the main power supply of the device from the electricity mains:
- do not use adapters, multiple sockets or extensions;
- use a multiple pole switch with at least a 3 mm gap between the contacts (overvoltage category III), as envis-
aged by the present safety standards.
Do not touch the device with wet or damp body parts and/or in bare feet.
Do not pull the electric cables.
Before carrying out any maintenance, cleaning or checking oper-
ations:
Disconnect the electrical supply from the burner
by means of the main system switch.
DANGER
Turn off the fuel interception tap.
DANGER
Avoid condensate, ice and water leaks from form-
ing.
DANGER
If the cover is still present, remove it and proceed with the electri-
cal wiring according to the wiring diagrams.
Use flexible cables in compliance with the EN 60 335-1 standard.
5.12.1 Supply cables and external connections
passage
All the cables to be connected to the burner must be threaded
through cable grommets. The use of the cable grommets can
take various forms; by way of example see Fig. 20.
Key (Fig. 20)
1
Electrical supply - Bore for M32
2
Consents / Safety devices - Bore for M20
3
Minimum gas pressure switch - Bore for M20
4
VPS gas valve leak detection control kit- Bore for M20
5
Gas train - Bore for M20
6
Available - Bore for M20
7
Available - Bore for M16
Cable grommets used in the factory:
A - Fan motor
B - Maximum gas pressure switch
C - Air/gas servomotor
Installation
20073934
After carrying out maintenance, cleaning or
checking operations, reassemble the cover and
all the safety and protection devices of the burner.
21
GB
Fig. 20
20160598
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