26
FUNCTIONAL DIAGRAM
Fig. 41
NOTE: L-N-E connection is advisable
AKL
Main PCB with vis medium integrated
P1
Selector switch and heating potentiometer
P2
DHW potentiometer
P3
Unused
P4
Unused
JP1
Unused
JP2
Unused
JP3
Unused
JP4
Unused
JP5
Unused
JP6
Unused
JP7
Unused
JP8
Closed -
Unused
LED
Led 1 (green) working status or temporary stop
Led 2 (yellow)
DHW pre-heat
and CO
2
function ON
Led 3 (red) boiler lock out
CN1-CN15
Connectors - CN5 Room thermostat (24 Vdc)
S.W
.
CO
2
function button
F.S. (1)
Flame sensor
F1
Fuse
3.15A
T
F
External fuse 3.15A
F
M3
Terminal strip for electrical connection high power
P
Pump
OPE
Gas valve solenoids
F Hv
Fan power supply 230 V
F Lv
Fan signal control
D.H.W
.F
.S
Domestic hot water flow switch
D.H.W
.T
Domestic hot water temperature
WPS
W
ater pressure switch
S.E.
Spark electrode
TSC2
Ignition transformer
3W
3 way motor
F.O.H.T
Flow over heat thermostat
FS
Flue sensor
FT
Flow thermistor (NTC)
RS
Return thermistor (NTC)
brown
CN3
blue
F Hv
1
2
7
1
CN9
W.P.S.
2
3
1
D.H.W.T.
D.H.W.F.S.
white
white
red
red
violet
violet
3W
2
N
1
D.H.W.
3
Heat
black
brown
blue
3
1
CN4
AKL
JP1
JP2
JP3
JP4
JP5
JP6
JP7
JP8
P4
P3
P2
P1
CN13
CN14
F1
3.15A T
CN12
CN5
CN6
CN1
1
1
6
1
2
1
3
CN2
CN3
CN4
L1
L2
L3
1
12
CN11
1
4
CN10
1
7
CN9
FA1
FA2
1
5
CN7
1
3
CN8
F.S. (1)
CN15
SW1
6
1
CN2
brown
blue
2
1
3
5
4
GAS VALVE
1
2
4
3
OPE
OPE
pink
blue
P
brown
N
L
Fuse 3.15A F
230 V
M3
F
blue
blue
brown
brown
brown
blue
brown blue
1
2
3
AMP
1
2
3
AMP
black
red
blue
brown
4 4
Connector
clock
TSC2
blue
Spark electrode
brown
yellow/green
N
F
CN1
3
1
2
red (+)
blue (HS)
pink (PWM)
grey (−)
CN10
F Lv
1
4
1
12
CN11
white
white
F.T.
−t°
−t°
R.S.
red
red
−t°
F.S.
grey
grey
black
F.O.HT.
blue
blue
white