Electrical
21
Figure 8-1: Boiler wiring diagram
4B
BL
BL
DR
DR
RD
GR
GR
BR
BR
G/Y
Timer
Colour code:
BR - Brown
BL - Blue
RD - Red
G/Y - Green/Yellow
BLK - Black
OR - Orange
Y - Yellow
GR - Grey
On/Off
Switch
C/W Neon
5B
1A
2A
123
ENL
ENL ENL
NL
456
ENL
789
ENL
10 1112
ENL
OR
13 14 1516 23 2425 26
27 28
171819 20 21 22
Mains CH Pump DHW Pump Burner
Low Press
Switch
Flow
Switch
CH
Timed on
Timer Neutral
Timer Live
DHW
Timed on
Room Stat (from)
Thermistors
Store Flow
Ext Frost Stat (from)
Ext Frost Stat (to)
Boiler isolation
Plug
Printed Circuit Board
CH
Pump
Switched live CH
Switched live DHW
Y
OR
G/Y
BL
RD
Black
Cable
DHW
Pump
Flow
Switch
No No
Pressure
Switch
Store
Thermistor
Flow
Thermistor
Burner
White
Cable
Black shroud
indicates flow
thermistor
Earth connection
boiler top bracket
Limit
Thermostat
Earth post
control panel
chassis
Service
switch
G/Y
G/Y
2
C
8.2 Connecting the Controls -
Heating Only
To control the central heating on / off
periods only (and not the domestic hot
water), it is recommended to use one of
the following options:
• A single channel timer and room
thermostat.
• A Grant programmable room
thermostat (Ref. RSKIT).
Either of these options should be sited
at a suitable and convenient location
within the property.
The switched live from these central
heating controls must be connected to
Terminal L1 on the boiler electrical
isolation plug. Refer to Figure 8-2 or
Figure 8-3 as appropriate for connection
details.
When using the boiler in this way, i.e.
controlling the heating operation of the
boiler only, a link must be fitted between
terminals L2 and L3 in the isolation plug.
This will enable the boiler to operate to
supply hot water on demand at all
times.
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