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41
9 .2
Ladder diagram
120V / 60 Hz / 1 ph
L
X1-2 MAINS
X3 MAINS GND
w
P
g
F
HV
X1-4
X1-5
g
w
w
w
w
bk
bk
bk
g
X1-6
X1-1
X15-2
X15-1
X6-3
X6-2
X6-1
FS1
I
OT
SE
X7
X11-6
X11-5
X11-4
X11-3
X11-2
X11-1
o
r
o
r
p
bk
bk
CN1-1
CN1-2
CN1-3
CN1-4
CN3A-1
CN3A-2
CN3A-3
TBT
y
r
bk
o
+
B
A
_
X14-1
X14-3
X14-5
X14-4
bl
r
bl
r
gr
gr
br
X9-1
X9-2
X9-3
X9-4
X9-5
X9-6
RS
SS
APS
FS
MAINS X1-3
MAINS
MAINS
w
X11-5
X11-6
N
bk
w
r
bk
bk
bk
w
g
bk
bk
A K M 1 1
B E 2 1
GV
M3
M4
M4
M3
M8
M8
M8
g
M8
g
M3
NOTE 1
W
R
C
FU
NOTE 2
M8
bk
w
bl
wire line type
factory wiring
field wiring
RS
Return sensor
(thermistor)
SS
Supply sensor
(thermistor)
FS
Flue sensor
APS
Air pressure switch
TF
Thermal fuse
WHL
Water high limit
COMPONENTS LABELS
AKM11
Main board
BE21
24 VAC Thermostat
SC07
Control interface
M3-M4
Mains terminal strip
M8
Multi-clip ground plate
External links connectors
FU
Fuse
r
p
bl
gr
r
bl
y
w
X12-4
X12-3
X12-2
X12-1
3W
FPWM
X13-4
X13-3
X13-2
X13-1
X19-5
X19-4
X19-3
PT
br
bl
bk
X19-2
X19-1
gr
gr
MOD
M
P W M
1
0
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
w
w
X25-1
X25-2
CN2-1
CN2-2
CN2-2
CN2-1
bk
X10-4
o
r
X10-3
X10-2
w
g
X10-1
J1-4
J1-3
J1-2
J1-1
BE20
X17-4
X17-5
X17-3
X17-1
+
B
A
-
v
bk
gr
r
SC07
DISPLAY
BE20
Lighting guide
X19-8
X19-7
X19-6
X19-9
DHWT
FM
r
r
bl
o
v
X19-10
X9-10
X9-9
w
w
bk
bk
t
WHL
THE
TF
CE8|R
CE8|C
CE8|W
CE8|G
CE8|OT
CE8|G
CE8|SE
CE8|TBT
CE8|TBT
CE4|+
CE4|B
CE4|A
CE4|-
Gas valve modulator coil
MOD
2. Fuse 4A T.
1. Remove jumper to connect TBT.
Notes:
3 way stepper valve
3W
Fan PWM signal
FPWM
Flow meter
FM
Domestic hot water temp. sensor
DHWT
Pressure transducer
PT
Bus 485
+ B A -
thermostat
Low temp. limit
TBT
Outdoor temp. sensor
SE
OpenTherm (OTbus)
OT
Flame sensor
FS1
Ignitor
I
High voltage
HV
Fan (blower)
F
Pump
P
Gas valve
GV
Room thermostat heating
W
Common
C
Room thermostat 24 VAC
R
THE
Thermostat Heat Exchanger
CE4-CE8
BWCAAG000120/BWCAAG000150 - Combi Model