Electrical Connections; External Wiring - FULTON FHE-250 Installation, Operation & Maintenance Manual

2.19

ELECTRICAL CONNECTIONS

A mains supply of 230 V 50 Hz is required (Live, Neutral and Earth). An additional Earth is required to be
connected to the Master Module chassis Earth Bonding point on the front RHS vertical frame strut.
Where more than one module is to be installed, i.e. FHE-500, 750, 1000 each module chassis must
also be bonded together using earth bonding straps.
Wiring external to the boiler MUST be in accordance with the current I.E.E. (BS7671) wiring
Regulations and any local regulations. For Ireland reference should be made to the current ETCI
rules for electrical installations.
Connection should be made in a way that allows complete isolation of the electrical supply- such as
a double pole switch, having a 3 mm (1/8") contact separation in both poles. The means of isolation
must be accessible to the user after installation.
When making mains electrical connections to the modules it is important that the wires are prepared
in such a way that the earth conductor is longer than the current carrying conductors, such that if
the cord anchorage should slip, the current carrying conductors become taut before the earthing
conductor.
Sensor cables must be separated from cables in the 230 V circuit.
2.19.1

ExTERNAL WIRING

External wiring MUST be in accordance with the current I.E.E. (BS7671) Wiring Regulations.
For Ireland reference should be made to the current ETCI rules for electrical installations.
For wiring external controls to the boiler, reference should be made to the systems wiring diagram
supplied by the relevant manufacturer.
Difficulty in wiring should not arise, providing the following directions are observed:
All cables should be secured using cable glands in locations through the boiler panels to suit the
individual arrangements.
Note: Care should be taken when positioning the holes for the wiring to ensure no clashes with any of the internal
structure of the boiler or the on-board electrical panel. All external devices should be wired to each boiler in the
same way.
1. The appliance must be wired with a permanent live supply. External controls should NOT be
wired in series with this mains input. Controlling the mains input in this way will prevent the
pump over-run sequence and may cause damage to the heat exchanger.
2. Connection of Header Pump: A Cascade/System pump may be connected to the
boilers via an external contact or relay with options for single speed pump (volt free
contact - On/Off) or variable speed PWM (Pulse Width Modulation) pump. This pump is
controlled from the boiler and runs whenever any module is active, also providing pump
overrun. This output may also be used to provide pump overrun requirements to a BMS or
control panel where multiple pumps or zones are installed. For details of the terminal
connections to use for the different pump types, refer to the tables in Section 2.19.2 of this
manual.
Note. The circuit protective device, isolation switch and wiring must be sized in accordance with the total load of
both the boiler and module pumps.
!
WARNING
This appliance MUST be earthed.
!
WARNING
FHE-250 MANUAL 09 2014 ISSUE 2
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