7 Wiring diagrams
NGW 300 / LGW 300 / GBW 300
706
Fig. 705 System wiring for the GBW 300 (standard and DC)
1
UP control signal
2
W-Bus diagnosis
Item
Designation
Comment
A1
Heater
GBW 300
A2
Control unit
B1
Temperature limiter
B2
Regulating thermostat
F1
25 A fuse
DIN 72581
F2
5 A fuse
DIN 72581
H1
Lights
Operating indicator
H2
Lights
Flame indicator
K1
Solenoid
High pressure
K2
Solenoid
Low pressure
K3
Solenoid
(1 sec.delayed action)
only for the NGW
M1
Motor
Operating indicator
M2
Motor
Circulating pump
S1
ON/OFF switch
Combustion air fan
S2
ON/OFF switch
Remote-controlled circulating pump
S3
Vacuum switch
U1
Ignition spark generator
U2
Ignition electrode
Item
Designation
Comment
U3
Flame monitor electrode
X1
2-pin plug connection
A2 control unit
X2
4-pin plug connection
A2 control unit
X3
8-pin plug connection
A2 control unit
X4
4-pin plug connection
A2 control unit
X5
4-pin plug connection
A2 control unit
X6
2-pin plug connection
Pressure regulator
X7
2-pin plug connection
Solenoid (delayed-action)
X8
2-pin plug connection
Temperature limiter
X9
2-pin plug connection
Regulating thermostat
X10
1-pin plug connection
Ignition spark generator
X11
1-pin plug connection
Vacum switchr
X12
1-pin plug connection
Combustion air fan
X13
1-pin plug connection
Flame sensor
X14
2-pin plug connection
Circulating pump
X15
4-pin plug connection
Vehicle interface
X16
7-pin plug connection
Vehicle interface
X17
7-pin plug connection
Vehicle interface
Y
Pressure regulator