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40
BWHAAG000120/BWHAAG000150 - Heating Only Model
9
In C CASE configuration “ external indirect tank with
sensor” add a jumper on the TBOL input of the M4a
AKM11
X17
X14
1
1
X12
X23
X16
X2
X21
X8
X13
X19
X9
X25
X11
X18
X22
1
1
1
1
1
1
1
1
6
1
5
12
10
4
3
5
4
6
5
6
X15
X1
X4
X6
1
3
1
5
1
2
1
6
X3
X7
orange
F.S.(1)
F2=4A T
CN1
X10
A9
SW1
white
black
green
X6
3
1
2
a
b
N
L
S.E.
black
white
ZAG 2
black
X15
white
F Hv
1
2
red (+)
blue (HS)
pink (PWM)
grey (-)
X13
F Lv
1
4
red
red
S.S.
-t°
-t°
R.S.
blue
-t°
F.S.
grey
grey
W.H.L.
white
white
blue
A.P.S.
1
2
brown
black
T.F.
black
T.H.E.
12
1
X9
4
3
2
1
5
red
blue
yellow
white
3W
X12
1
4
2
3
1
4
2
3
green (A1)
red (A2)
red (A2)
green (A1)
orange (K2)
orange (K2)
white (K1)
white (K1)
X10
J1
BE20
black (TA) black (TA)
pink (OT) red (OT) gnd
red (SE) gnd
orange (SE)
6
1
1
2
5
1
red (+)
yellow (B) orange (A) black (-)
white (TBT)
white (TBT)
X11
X14
X25
1
2
black (TA) black (TA)
2
1
3
white (W)
black (C)
red (R) (+24Vac)
CN3A
CN2
BE21
CN1
CN2
1
2
3
4
1
2
2
CN3A
1
3
2
1
3
4
white
black
blue
black
white
CN1
white
black
white
black
black
white
black
white
black
white
M4
120 V auxiliary
L
N
120 V
black
white
white
5
4
2
1
3
6
black
black
white
OPE
OPE
3
4
2
1
black
P
white
pink
4
5
3
1
2
M3
X1
GAS VALVE
black (-)
orange (A)
yellow (B)
red (+)
-
A
B
+
CE4 (underneath bottom panel)
TBT
OT
SE
white (TBT)
white (TBT)
pink (OT)
white
CE8 (underneath bottom panel)
red (SE - OT) gnd
orange (SE)
W
R
C
red (R) (+24Vac)
white (W)
black (C)
CE4
(- A B +)
Bus 485
CE8
TBT
Low Temperature
Thermostat
SE - G
Outdoor Temperature
Sensor
OT - G
Open therm (OTBus)
R
Room thermostat (24V)
W
Room Thermostat -
Heating
C
Room Thermostat -
Common
M4a
T.BOLL.
DHW Aquastat
S.BOLL.
DHW 10kOhm NTC
G
6
1
red (+ 24Vdc)
black (-)
violet (A)
grey (B)
violet (A)
black (-)
red (+ 24Vdc)
grey (B)
X17
SC07
grey
grey
red
red
black (alim.)
blue (sign.)
brown (-)
MOD
P.T.
1
3
1
X19
10
violet
violet
T.BOLL.
S.BOLL.
-t°
M4a
AKM11
Main PCB
SC07
Control Interface
BE20
Board Led: green led (operating or
temporary stop)
red led (boiler in lockout)
BE21
24VAC Thermostat
X1-X25
Connectors
CN1-CN2-CN3A
Connectors
S.W.1
CO2 function button
F.S.(1)
Flame sensor
F2
Fuse 4A T
M3-M4
Terminal strip for electrical connection
high power
M4a
Terminal strip for electrical connection:
T.BOLL
DHW Aquastat
S.BOLL
DHW 10kOhm NTC
CN4
External links connector:
(- A B +) Bus 485
CN8
External links connector:
TBT Low Temperature Thermostat
OT – G Open therm (OTBus)
SE – G Outdoor Temperature Sensor
R Room Thermosat (24V)
W Room Thermosat - Heating
C Room Thermosat - Common
X11
SE
Outdoor Temperature Sensor
OT+
Open therm (OTBus)
TA
Room Thermostat (voltage free contact input)
P
Pump
OPE
Gas valve solenoids
F Hv
Fan power supply 120 V
F Lv
Fan signal control
3W
3 way valve motor
ZAG 2 (US…)
Spark generator
S.E.
Spark electrode
W.H.L.
Water high limit
T.H.E.
Heat exchanger thermostat
T.F.
Thermal fuse
F.S.
Flue sensor
A.P.S.
Air pressure switch
S.S.
Supply sensor (thermistor)
R.S.
Return sensor (thermistor)
P.T.
Low water cutoff
MOD
Modulator gas valve