26
FUNCTIONAL DIAGRAM
CN1-CN15
Connec
tors -
(CN4 Unused – 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
T
ermina
l strip for electrical connection high power
P
Pump
OPE
Gas valve solenoids
F Hv
Fan power supply 230 V
F Lv
Fan signal control
WPS
W
ater pressure switch
S.E.
Spark electrode
TSC2
Ignition
transformer
F
.O.H.T
Flow over heat thermostat
F
.S.
Flue sensor
FT
Flow thermistor (NTC)
RS
Return thermistor (NTC)
AKL
Main PCB
P1
Selector switch and heating potentiometer
P2
Unused
P3
Unused
P4
Unused
JP1
Unused
JP2
Unused
JP3
Unused
JP4
Unused
JP5
S
electio
n operating
only heating
JP6
Unused
JP7
Unused
JP8
Closed
-
Unused
LED
Led 1 (green) working status or temporary stop
Led 2 (yellow) CO
2
function ON
Led 3 (red) boiler lock out
brown
CN3
blue
F Hv
1
2
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
7
1
CN9
W.P.S.
white
white
1
3
2
TSC2
blue
Spark
electrode
S.E.
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
AKL
JP1
JP2
JP3
JP4
JP5
JP6
JP7
JP8
P4
P3
P2
P1
CN13
CN14
F1
3.15A T
CN12
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
CN1
CN2
NO
NC
C
black
black
BE11
orange
CN5
Fig. 43