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5.
ELECTRICAL WIRING
5.1
GENERAL
Warning:
The boiler must be permanently connected to a 230V~, 50Hz supply. This appliance MUST BE
EARTHED.
All external wiring to the boiler must be in accordance with the latest I.E.E. Wiring Regulation, and any local
regulations which may apply
There must be only one common isolator for the boiler and its
control system, and it must provide complete electrical
isolation via a double pole isolator fused at 3A maximum with
a contact separation of at least 3mm in both poles.
The fused spur box should be readily accessible and
preferably adjacent to the appliance and it should be
identified as to its use.
Alternatively the connection can be made through an
unswitched shuttered socket and 3A fused 3-pin plug both to
the current issue of BS 1363 may be used, provided they are
not used in a room containing bath or shower.
Do not interrupt the mains supply to the boiler with a time
switch or a programmer.
In the event of an electrical fault after installation of the
appliance, preliminary electrical checks must be carried out i.e. Earth Continuity, Short Circuit, Polarity, and
Resistance to Earth.
L
SL
_B
E
N
E
L_
P
N_
P
Mains input
cable
Pump output
cable
Cable clamp
Diagram 5.2 Wiring terminals and cable connections
Wiring terminals
See table 5.1
L
SL
_B
E
N
E
L_
P
N_
P
Mains input
cable
Pump output
cable
Diagram 5.2 Wiring terminals and cable connections
Wiring terminals
See table 5.1
Electrical components in this appliance have been tested to meet the requirements of the BEAB.
5.2
EXTERNAL CONTROLS (Mains Voltage: 230V, 50Hz)
(a) The Gledhill boilers are fitted with wiring terminals inside the control panel as shown in diagram 5.1.
The access to these terminals is gained by first removing the front cover by removing the two screws at
the bottom (front) and then opening the hinged control panel by first unscrewing the retaining screw.
(b) Observe all terminal markings and colour codes as shown in diagrams 5.1 – 5.4 and table 5.1. Ensure
that all flexible cords are routed through the strain relief cable glands and clamps located on the bottom
of the boiler and in the control/wiring panel.
(c) Ensure that the separate external mains supply, control and pump cables are fed to the boiler. Connect
both the mains supply and
switched live supply from
the external controls (e.g.
room thermostat,
BoilerMate) into the marked
terminals as shown in
diagrams 5.2, 5.3 and 5.4.
For the conventional
heating systems also
connect the pump supply
into the marked pump
terminals as shown in diagrams 5.2 and 5.3.
Table 5.1 Description of boiler wiring terminals
Terminal Description
L
Mains (L) supply – 230V ~ 6A rated cable (0.75mm
2
)
N
Mains (N) supply – 230V ~ 6A rated cable (0.75mm2)
E
Mains (GND, E) supply – 0V ~ 6A rated cable (0.75mm
2
)
SL-B
Switched Live (L) supply – 230V~ 6A rated cable (0.75mm
2
)
L-P
Supply to pump (L) – 230V~ 3A rated cable (0.75mm
2
)
N-P
Supply to pump (N) – 230V~ 3A rated cable (0.75mm
2
)
E
Supply to pump (GND, E) – 0V ~ 6A rated cable (0.75mm
2
)
(d) The controller in this boiler is phase sensitive. Therefore if mains supply ‘Live’ and ‘Neutral’ are
reversed, the controller will not work and the error message will be displayed.
VER: 02.3 _260505
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