11.1 MAINS SUPPLY.
230 V ~, 50 Hz, 180 watts.
External Fuse: 3A. Internal Fuses: 2A SLOW (F1), and 1A
FAST(F2).
Spare fuses are supplied with the appliance and are fixed
adjacent to the pressure gauge.
11.2 It must be possible to completely isolate the appliance.
11.3 The following connection alternatives must be used:
A 3 amp fused three-pin plug and unswitched shuttered socket
outlet (both complying with the requirements of BS 1363) or a
double pole isolator with a contact separation of 3mm in all
poles and supplying the appliance and controls only.
11.4 The appliance must be earthed.
11.5 Mains Cable. 0.75mm
2
(24 x 0.20mm) to BS 6500 Table 16.
The mains cable must be connected into the terminal
X1,
marked
L (Brown or Red lead), N (Blue or Black lead) and the
earth stud and be held securely in the cable clamp. For access
undo the three bottom screws and remove the facia access cover.
See Fig. 11. The earth lead must be slack when the others are taut.
11.6 The wiring between the appliance and the electrical supply
shall comply with current IEE Wiring Regulations and any local
regulations which apply.
11.7 If a room thermostat and/or external programmer is to be
fitted refer to Figs 12 and 13. The devices must be suitable for
use with mains voltage.
11.8 A facia mounted mechanical programmer is available as an
optional extra. Instructions are supplied with the programmer kit.
11.9 A time switch or programmer can be fitted externally to the
appliance.
11.10 The boiler provides automatic frost protection, the use of
a frost thermostat is not recommended. However if an external
frost thermostat is considered necessary then it must be used in
conjunction with a programmer.
Important: To provide external frost protection the appliance
must have the Central Heating Temperature Control Knob set to
supply heating (the appliance may then be left with the central
heating turned off at the programmer).
Connection must be made at
X2 terminals RI and CL. refer to Fig.
28. For advice on external frost thermostats contact Worcester
Heat Systems Technical Helpline
11.11 SAFETY CHECK.
After installation or in the event of an electrical fault the
electrical system shall be checked for short circuits, fuse failure,
incorrect polarity of connections, earth continuity and resistance
to earth.
11. Electrical
10
Fig. 9. Wiring diagram.
Overheat
thermostat
DHW sensor
CH
sensor
Gas
valve
Pump
Main
Reg
Flow turbine
Air
pressure
switch
Spark transformer
Mains in
2 Blue
2 Red
2 Yellow
2 Orange
Blue
Blue
Brown
Link
Link
X1
X2
X3
X6
X5
X4
Flame sense
electrode
Spark
electrode
Brown
White
Green
COM
NC
NO
Yellow
Blue
Fan
Brown
Brown
Brown
Black
Green
White
1 2
3
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