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Ladder diagram
9 .2
BWCAAG000120/BWCAAG000150 - Combi Model
wire color code
bk
black
w
white
bl
blue
br
brown
r
red
g
green
y
yellow
p
pink
v
violet
o
orange
gr
grey
wire line type
factory wiring
field wiring
COMPONENTS LABELS
AKM11
Main board
BE21
24 VAC Thermostat
SC07
Control interface
M3-M4
Mains terminal strip
M8
Multi-clip ground plate
CE4-CE8
External links connectors
FU
Fuse
BE20
Lighting guide
RS
Return sensor
(thermistor)
SS
Supply sensor
(thermistor)
FS
Flue sensor
APS
Air pressure switch
TF
Thermal fuse
WHL
Water high limit
THE
Thermostat Heat Exchanger
MOD
Gas valve modulator coil
PT
Pressure transducer
DHWT
Domestic hot water temp. sensor
FM
Flow meter
FPWM
Fan PWM signal
3W
3 way stepper valve
R
Room thermostat 24 VAC
C
Common
W
Room thermostat heating
GV
Gas valve
P
Pump
F
Fan (blower)
HV
High voltage
I
Ignitor
FS1
Flame sensor
OT
OpenTherm (OTbus)
SE
Outdoor temp. sensor
TBT
Low temp. limit
thermostat
+ B A -
Bus 485
Notes:
1. Remove jumper to connect TBT.
2. Fuse 4A T.
L
M3
bk
bk
M4
bk
bk
RS
SS
FS
APS
br
WHL
TF
THE
bk
bk
t
MOD
PT
DHWT
FM
P
W
M
1
FPWM
0
3W
M
41
120V / 60 Hz / 1 ph
g
M8
M3
MAINS
CN1-1
CN1-2
CN1-4
CN3A-1
bl
CN1-3
CN3A-2
CN3A-3
CN2-1
CN2-2
FU
MAINS
X1-2
X1-3
X3
bl
X9-1
bl
X1-4
X9-2
r
NOTE 2
X1-5
X9-3
r
X9-4
X1-6
gr
X9-5
X1-1
gr
X9-6
X15-2
w
X15-1
X9-9
w
X9-10
X6-3
gr
X6-2
X19-1
X6-1
gr
X19-2
bk
X7
X19-3
bl
X19-4
br
X19-5
X11-6
X11-5
r
X19-6
X11-4
r
X11-3
X19-7
X11-2
o
X19-8
X11-1
bl
X19-9
v
X25-2
X19-10
X25-1
gr
X14-1
X13-1
bl
X13-2
X14-3
p
X14-4
X13-3
r
X13-4
X14-5
r
X12-1
X17-1
X17-3
bl
X12-2
X17-4
y
X17-5
X12-3
w
X12-4
X10-1
X10-2
X10-3
X10-4
BE20
w
MAINS
w
r
R
CE8|R
bk
C
CE8|C
w
W
CE8|W
bk
X11-5
bk
X11-6
w
MAINS
g
MAINS GND
M8
bk
GV
w
g
M8
bk
g
P
w
M8
bk
g
F
w
M8
bk
w
HV
g
I
FS1
o
bk
CN2-2
bk
CN2-1
r
CE8|G
p
CE8|OT
r
CE8|G
o
CE8|SE
w
CE8|TBT
NOTE 1
w
CE8|TBT
r
CE4|+
y
CE4|B
o
CE4|A
bk
CE4|-
r
+
gr
SC07
B
v
DISPLAY
A
bk
-
g
w
r
o
N
M3
w
M4
OT
SE
TBT
+
B
A
_
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