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Electrical connections
B Secure cable in cable grommet by means of cable
grip.
L
N N L
S
Fig. 30
4.2
Wiring to your system
The boiler is fitted with an internal pump and there are
two recommended ways of connecting a system, exter-
nal 230v or internal 24v depending on the choice of
diverter valve(s).
4.2.1
External 230v
Non-supplied parts required: external 230v conven-
tional terminal block or wiring centre, pre-wired to the
230v diverter valve(s) and all other 230v system com-
ponents.
Note:
Honeywell and Siemens Y plan valves require a
capacitor to be wired across the switch wire and neu-
tral of the external wiring centre or across the L
N
terminals on the boiler. The capacitor required is a
S
0.47 microfarad capacitor 275 vac class X2 type. This
can be obtained from an electronics wholesalers such
as Farnell Tel. 0870 1200 202. The Farnell part
number for this capacitor is 869-491.
• See section 4.1 to gain access to the boiler mains
wiring centre
• Remove the connecting link from L
and connect the system to the boiler. Two typical
examples of this are shown in Fig. 31 and Fig. 32.
• Any other components (including frost thermostats)
cannot be connected to the boiler and should
instead be connected to the external terminal block
or wiring centre in accordance with the manufactur-
ers proprietary instructions. No liability is accepted
arising from or by any wiring external to the boiler.
22
and
R
and L
terminals
Fig. 31 A typical example of external 230v connection
S
R
ZONE VALVE
HTG
MOTOR
G/YELLOW
ROOM STAT.
2 1 3
1
2
3
4
TIME
CONTROLLER
N
L
HW HTG
L
N N L L
R
S
S
using 2 zone valves
ZONE VALVE
DHW
BLUE
MOTOR
CYLINDER
STAT.
1
C
5
6
7
8
9
10
6 720 611 443-03.1O
6 720 611 443 GB (05.04)
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