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5.1 GENErAL
Warning: The boiler must be permanently connected to a 30V~, 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.
Electrical components in this appliance have been tested to meet the requirements
of the BEAB.
Mains input
cable
L
L
N
N
E
E
Diagram 5.2 Wiring terminals and cable connections
Table 5.1 Description of boiler wiring terminals
Terminal
Description
L
Mains (L) supply – 30V ~ 6A rated cable (0.75mm)
N
Mains (N) supply – 30V ~ 6A rated cable (0.75mm)
E
Mains (GND, E) supply – 0V ~ 6A rated cable (0.75mm)
SL-B
Switched Live (L) supply – 30V~ 6A rated cable (0.75mm)
L-P
Supply to pump (L) – 30V~ 3A rated cable (0.75mm)
N-P
Supply to pump (N) – 30V~ 3A rated cable (0.75mm)
E
Supply to pump (GND, E) – 0V ~ 6A rated cable (0.75mm)
Pump output
cable
Cable clamp
SL
SL
L_
L_
N_
N_
Wiring terminals
_B
_B
P
P
P
P
E
E
See table 5.1
ELEcTrIcAL WIrING
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.. 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. – 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.
Table 5.1 Description of boiler wiring terminals
(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., 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. and 5.3
(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.
(e) Electrical Connection Testing
Carry out the preliminary electrical checks below
after wiring and before switching on the supply: -
•The insulation resistance to earth of mains
cables.
•Test the earth continuity and short circuit of
cables.
•Test the polarity of the mains.
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