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2.3.8
ELECTRICAL SUPPLY AND CONNECTIONS
2.3.8.1
WARNINGS
Suitably qualified and competent personnel should carry out the electrical installation. Before
commencing the installations ensure that all electrical supplies to the boiler are disconnected and that
the gas supply is turned off.
You must always comply with the basic safety and electrical regulations that are in force when carrying
out the electrical installation of the burner. This includes Statutory regulations and National and
International Standards where they apply.
It is vital that all safety requirements are met. In case of any doubt, ask for an accurate inspection of
the electrics by suitably qualified and competent personnel, since the manufacturer cannot be held liable
for damages that may be caused by failure to adequately earth the bunter.
Suitably qualified and competent personnel must also inspect the system to ensure that it is adequate to
take the maximum power used by the boiler as shown on the boiler data plate. In particular ensure that
the apply input cable cross-section is adequate for the power demand of the boiler.
The use of adapters, multiple outlet sockets and/or extension cables to connect the burner to the
electrical mains is NOT permitted.
An omnipolar disconnection system must be incorporated into the fixed wiring that provides a contact
separation of at least 3mm in all poles.
Always provide a magneto-thermal differential switch in the circuit that or be connected to the mains
supply.
Always ensure that equipment is connected to a right dimensioned earthing system, to avoid safety and
EMC problems.
2.3.8.2
CONNECTIONS TO DO
Connections need to be made to:
-
the earth connection from the boiler body to the earth screw on burner mounting plate (with cable
supplied, already fixed to the fixing side bracket).
-
the supply Live, Neutral and Earth (on the 7-way connector with the cable supplied). The supply
cable must be inserted and fixed in the gland provided on the side casing front fixing bracket and
then passed through the bushing on the side casing rear fixing bracket.
-
The flow and return sensors (the sensors are supplied separately, in the boiler block packaging).
The electrical connection has to be made on the 4-way connector; then, the bulbs of the sensors
have to be placed in the provided sockets on the boiler body:
-
the flow sensor, in the front of the boiler just above the burner;
-
the return sensor, in the rear of the boiler on the water distribution pipe.
Possible connections to:
-
the circulating pump of the boiler (on the 7-way connector)
-
a control thermostat (on the 7-way connector).
See the electrical wiring diagrams in the following pages.
2.3.8.3
OPTIONALS
1.
The outside temperature sensor is not delivered with the boiler. Please, order it as an optional
kit (part number xxxxxxxx)
2.
For a DHW installation, to connect the DHW temperature sensor and the three-way valve you
have to order a wiring loom as an optional kit (part number xxxxxxxx). Follow the instructions
contained in the kit.
3.
The Open Therm device is not delivered with the boiler. You can buy it and connect it to the X6
connector on the ENCON electronic box, placed on the burner.
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