14
4.7
ELECTRICAL CONNECTIONS
The electrical supply must be as specified in sec-
tion 3/3A. A qualified electrician should connect
the electrical supply to the appliance. If controls -
external to the appliance - are required, a compe-
tent person must undertake the design of any
external electrical circuits, please refer to section
8 for detailed instructions. ANY EXTERNAL CON-
TROL OR WIRING MUST BE SERVED FROM
THE SAME ISOLATOR AS THAT OF THE AP-
PLIANCE. The supply cable from the isolator to
the appliance must be 3-core flexible sized 0.75mm
to BS 6500 or equivalent. Wiring to the appliance
must be rated for operation in contact with sur-
faces up to 90ºC.
4.7.1
CASING REMOVAL
To gain internal access to the appliance you must
first remove the casing, proceed as outlined below:
•••••
locate and remove the 2 transit screws (
C
)
•••••
remove the 2 screws (
B
) located at the Left &
Right of the underside of the casing
•••••
lift the casing upward to disengage it from the top
locating hooks and then remove
•••••
store the casing and screws (
B
) safely until
required. Re-fit in the reverse order
•••••
use on of the discarded transit screws to secure
the cover to the boiler.
Fig. 14
A
B
B
cover
C
Fig. 15
Optional devices
(24V) terminal block
Mains (230V)
terminal block
4.7.2
APPLIANCE TERMINAL BLOCK
The appliance terminal block is located on the rear
of the control fascia. Remove the casing as
described in 4.7.1. Lift the control fascia upward
and lower it. Locate the terminal block covers (see
fig. 15).
NOTE
The appliance comes with a factory fitted link to
allow basic operation of the boiler via the mode
selector switch. If it is anticipated that external
controls will be required please refer to the wiring
diagrams in section 8 for more detailed information.
4.7.3
CONNECTING THE MAINS (230V) INPUT (see
fig. 16)
Locate and remove the screw securing the right
terminal block cover (230V). Pass the cable through
the cable anchorage point.
Connect the supply cable wires (LIVE, and NEU-
TRAL) to their corresponding terminals on the
appliance terminal block. Connect the EARTH
wire to the EARTH block (see fig. 16) ensuring that
it’s left slightly longer that the others, this will
prevent strain on the EARTH wire should the cable
become taut.
Do not remove the link wire unless additional
external controls are to be fitted (see section 8).
The securing screw on the cable anchorage should
now be tightened. This must be done before the
control fascia is re-fitted in the upright position.
The appliance casing, screws and lower cover can
now be re-fitted.
Fig. 16
link wire
ME3
ME6