APPLIANCE INFORMATION
6 720 821 670 (2018/06) 13
3.5 Internal wiring diagram
Fig. 2 Electrical diagram
[1] Air pressure switch
[2] Fan (fan wiring: Live = purple wire, Neutral = brown wire
[3] Flue overheat thermostat
[4] Flow temperature sensor (NTC)
[5] Flame sense electrode
[6] Spark electrodes
[7] Overheat thermostat
[8] External pump
[9] PCB
[10] External wiring center/junction box
[11] Earth bar connection
[12] Gas valve
SPARK
TRANSFORMER
DIAGNOSTIC
INTERFACE
CODE
PLUG
MODE
SWITCH
Slow 2 A fuse,
AC 230 V
EMS
BUS
CH TEMPERATURE
CONTROL
ON/OFF
SWITCH
ST9
ST6
ST5
ST2
ST1
F1
230V~
Min
Max
Norm
LN LP NPLR
Earth
11
COMMON
230V MAINS
SUPPLY
SL
L
N
6720644744-27.3Wo
4
10
8
9
1
2
12
3
5
6
7
Colour sequence
Colour sequence
Green
Live
Neutral
Red
Blue
Violet
Orange
Pump Live
Pump Neutral
Switched Live
LN
LP
LRNP
Installer connections
Connection Function
ST1 230V supply to the appliance
• Live input (L)
• Neutral input (N)
ST2 External pump supply connections and Switched live
(Live Return) to the appliance
•Pump Live (LP)
• Pump Neutral (NP)
• Demand input (LR)
Earth • Earth connection, appliance 230V supply
• Earth connection, external pump supply
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