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Installation
4
4.9
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 carried out by qualified personnel and in compliance with the regulations currently in force in
the country of destination. Refer to the electrical layouts given in Appendix A.
declines all responsibility for modifications or connections different from those shown in the electrical layouts.
Check that the electrical supply of the burner corresponds to that shown on the identification label and in this manual.
See Fig. 8.
Do not invert the neutral with the phase in the electrical supply line. Any inversion would cause a lockout due to firing
failure.
The burners RS 68-120-160/E have been approved for intermittent operation. This means they should compulsorily
be stopped at least once every 24 hours to enable the control box to perform checks of its own start-up efficiency.
Normally the boiler's thermostat/pressure switch ensures the stopping of the burner.
If this is not the case, it is necessary to apply in series with IN a timer switch that turns off the burner at least once
every twenty-four hours. Refer to the electrical layouts given in Appendix A.
The electrical safety of the device is obtained only when it is correctly connected to an efficient earthing system,
DANGER
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 input power of the device,as indicated on the label and in the
manual, checking in particular that the section of the cables is suitable for the input power of the device.
For the main power supply of the device from the electricity mains:
- do not use adapters, multiple sockets or extensions;
- use an omnipolar switch with an opening of at least 3 mm (overvoltage category) between the contacts, as indicated
by the current safety standards.
Do not touch the device with wet or damp body parts and/or in bare feet.
Do not pull the electric cables.
If the hood is still present, remove it
and proceed with the electrical wiring
according to the layouts shown in
Appendix A.
Use flexible cables according to stand-
ard EN 60 335-1.
All the cables to be connected to the
burner are fed through the grommets.
See Fig. 21.
The use of the cable grommets can
take various forms. By way of example
we indicate the following mode:
1 - Three-phase power supply
2 - Single phase power supply
3 - Consents/safety
4 - Minimum gas pressure switch
5 - Gas valves
6 - Available
Cable grommets used in the factory:
A - Fan motor
B - Maximum gas pressure switch
C - Gas servomotor
D - Air servomotor
D7955
Fig. 21
GB
19
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