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BWHAAG000120/BWHAAG000150 - Heating Only Model
9
In C CASE configuration "boiler + external indirect tank with
sensor" add a jumper on the TBOL input of the M4a
40
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
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