32
FUNCTIONAL DIAGRAM
Fig. 46
AKL Main PCB
DWC Digital display
P1 Selector switch and heating potentiometer
P2 DHW potentiometer
P3 Potentiometer to select temperature regulation curve
P4 Unused
JP1 Enabling front setting knob (Range rated)
JP2 Unused
JP3 Setting (see “Setting and adjusting” paragraph)
JP4 Unused
JP5 Unused
JP6 Unused
JP7 Unused
JP8 Closed - Unused
CN1-CN15 Connectors
S.W. CO2 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
M2 Terminal strip for room thermostat (24 Vdc)
P Pump
OPE Gas valve solenoids
F Hv Fan power supply 230 V
F Lv Fan signal control
D.H.W.T Domestic hot water temperature
WPS Water 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
L2L3
1
12
CN11
1
4
CN10
1
7
CN9
FA1
FA2
1
5
CN7
1
3
CN8
F.S. (1)
CN15
SW1
blue
blue
blue
black
DWC
3
1
3
white
red
black
CN8
M2
Room thermostat
(24 Vdc)
CN1
red
black
white
1
23
4
5
CN1
blue
blue
blue
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
brown
blue
2
1
3
5
4
GAS VALVE
12 43
OPEOPE
pink
blue
P
brown
N
L
Fuse 3.15A F
M3
F
blue
blue
brown
brown
brown
blue
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