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7
Electric system
7.1
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.
DANGER
The manufacturer declines all responsibility for modifications or connections different from those shown in the
wiring diagrams.
Check that the electrical supply of the burner corresponds to that shown on the identification label and in this
manual.
The burners have been set for intermittent operation (FS1).
The RFGO safety device features two built-in flame amplifiers which allow using it for applications with UV sensor
only, FR sensor only or with both sensors (UV+FR).
The FR amplifier circuit is subject to constant auto-control, which allows to use it for applications requiring a
burner operating cycle longer than 24 hours.
When it is used as a UV control, the system is considered as non-permanent, requiring one burner recycle every
24 hours.
Normally, burner stopping is guaranteed by the boiler's thermostat/pressure switch.
If this is not the case, a time switch must be applied to L-N in series, to stop the burner 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
absorption.
For the main power supply of the device from the electricity mains:
- do not use adapters, multiple sockets or extensions;
- make provisions for an omnipolar switch with a gap between the contacts of at least 3 mm (over-voltage
category III), as required by current safety regulations.
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
operations:
Disconnect the electrical supply from the burner
by means of the system main switch.
DANGER
Close the fuel shut-off valve.
DANGER
Avoid condensate, ice and water leaks from
forming.
DANGER
The RL 38-50/M models leave the factory for 380-460 V power
supplies. If the power supply is 208-230 V, change the motor
connection (from star to delta) and the calibration of the thermal
relay.
The electrical connections are performed by the installer
Use flexible cables according to EN 60 335-1 Regulations:
•
if in PVC sheath, use at least H05 VV-F
•
if in rubber sheath, use at least H05 RR-F.
20167399
Electric system
22
GB
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