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44
Diagram 13.1
ACC Electronic igniter
AO Time clock power supply
C Pump
CO Time clock contact
EA Ignition electrode
ER Flame sense electrode
F1 Fuse (2 A)
MOD Modulator
MF Priority pressure switch
MPV Flue pressure switch
MV Fan motor
PSA Low water pressure switch
(“N.O.” contact closed = in pressure)
SR NTC sensor, heating
SS NTC sensor, DHW
TA Voltage-free Contact for generic
Room Thermostat or Cronothermostat
(safety extra low voltage SELV)
TC Condensate trap overfl ow sensor
TF Flue overheat thermostat
TS Overheat thermostat
VG Gas valve (coils)
Colours
abbreviations:
BK Black
BN Brown
BU Blue
GN Green
GNYE Green-Yellow
GY Grey
OG Orange
RD Red
VT Violet
WH White
YE Yellow
Electric diagram
13 Fault Finding
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