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5.13
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 wiring diagrams.
The manufacturer 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.
The burner has been type- approved for intermittent opera-
tion.
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
TL a timer switch that turns off the burner at least once every
twenty-four 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
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 III) between the contacts, as indi-
cated by the current safety standards.
Do not touch the device with wet or damp body parts and/or
in bare feet.
5.14
Calibration of the thermal relay pump motor
The thermal relay (Fig. 30) is used to avoid damage to the motor
owing to a strong increase in absorption or the lack of a phase.
For the calibration 2), refer to the table given in electrical layout
(Electrical connections set by installer).
To reset, in the case of an intervention of the thermal relay, press
the button "RESET" 1).
The button "STOP" 3) opens the NC (95-96) contact and stops
the motor.
To test the thermal relay, insert a screwdriver in the window
"TEST/TRIP" 4) and move it in the sense of the arrow (towards
right)
Automatic resetting can be dangerous.
This action is not provided for the burner op-
eration.
WARNING
Installation
Do not pull the electric cables.
Before carrying out any maintenance, cleaning or checking oper-
ations:
disconnect the electricity supply from the burner
by means of the main switch of the system;
DANGER
close the fuel interception tap.
DANGER
If the hood is still present, remove it and proceed with the electri-
cal wiring according to the layouts.
Use flexible cables according to standard EN 60 335-1.
All the cables to be connected to the burner are fed through the
grommets, as shown in Fig. 29.
5.13.1 Entry for power cables and external leads
7
7
S8068
Key to layout (Fig. 29)
1
Electrical supply
2
Available
3
Minimum gas pressure switch
4
Pressure switch for gas leak detection control device VPS
5
Gas train
6
Triggering / Safety devices
7
Available
D8685
27
GB
6
6
6
3
7
7
7
4
D8788
3
T O
I P
A U
/ T R
S T
N
M A
O P
T E
S T
T
S E
N C
R E
9 5
9 6
N O
9 7
9 8
1
2
4
1
5
Fig. 29
Fig. 30
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