Filter
Top Products
INSTALLATION
mini HE --- Installation & Servicing
25
29 ELECTRICAL CONNECTIONS
Warning. This appliance MUST be efficiently earthed
A mains supply of 230 V ~ 50 Hz is required.
Mains wiring should be 3 core PVC insulat ed flexible cord
NOT LESS than 0.75 mm
2
(24 x 0.2mm) and to BS. 6500,
Table 16. (0.5mm
2
flex is not acce ptable --- for mechanical,
not electrical reasons.)
Mains 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.
The supply connection is intended to be made via a double
pole s witch having a 3 mm (1/8”) contact separation in both
poles, serving only the boiler and system controls. A 3 pin
UNSWITCHED socket may, alternatively, be used.
The external fuse rating should be 3A.
F or external controls wiring see frame 33.
Note: the switch contacts of any external programmer,
room or frost thermostat must be volt free.
Connecting a switched live feed to external controls
terminal block may be dangerous and will result in
serious damage to the boiler.
30 ELECTRICAL CONNECTIONS
Incoming mains wiring detail
To gain access to the power supply and external controls
terminal blocks:
1 Remove the screws A and the front panel of the case.
A
2 Remove the screws B.
3 Loosen the screws C.
C
B
B
C
4 Remove the side panels or move the lower part of the side
panels and pull the control panel forward.
When completely pulled out, the panel can rotate 45û
downwards to f acilitate the operat ions on the internal parts.
5 Loosen the screws D and remove the service panel.
D
12
LN
3
Mains
Power supply
terminal block
External c ontrols
terminal block
Volt free contacts
Thermostat link
Remove when wiring external
thermostats.
Refer to frame 33
Note: Ensure that the lengths of the current conductors are
shorter than the earth conductor so that if the cable slips in its
anchorage the current carrying conductors become taut
before the earth conductor.
INSTALLATION