8
5.0 INSTALLATION - ELECTRICAL REQUIREMENTS
WARNING:
5.1 This appliance must be earthed.
5.2 The installation, supply cable and circuit protection must conform to
the latest BS7671 ‘Requirements for electrical installations’ (IEE Wiring
Regulations).
5.3 The appliance must only be connected to a 230/240 V ac supply. A double
pole isolating switch, with a contact separation of at least 3mm in both
poles, must be incorporated in the electrical supply. The supply should be
fused 13Amp.
5.4 If the unit is to be unused for significant periods of time running costs can
be reduced by switching the unit off. It is recommended that this is done
automatically by incorporating a suitable timeswitch in the supply to the
unit.
NOTE:A timeswitch must be capable of switching 13 Amps resistive load.
ELEMENT 'A'
LL N
S
PRIMARY
CUTOUT 'A'
SOLENOID
VALVE
LOWER
SENSOR
EARTH
UPPER
SENSOR
EARTH
UPPER LEVEL SENSOR
LOWER LEVEL SENSOR
SCALE
CONDITIONING
FIELD WINDING
'AT TEMP' LED ANODE
'AT TEMP' LED CATHODE
'POWER ON' LED ANODE
'POWER ON' LED CATHODE
WIRING SCHEMATIC
H
N
W
L1
L2
L3
J5
1
2
STEAM THERMISTOR
WATER THERMISTOR
6
5
7
8
9
10
J7
ELECTRONIC CONTROL
TERMINAL BLOCK
1
1
Figure 2: Wiring Diagram (2.5kW)
