17
K000104 - BW4+
EN
4.
E L E C T R I C A L C O N N E C T I O N
GAS SAFE
TY
CIRCUIT PCB/ ECU PCB
Exhaust gas
pressure
ELECTRONICS COMPARTMENT (POWER UNIT)
Pressure - 350 mbar
(internal exhaust heat exchanger)
Pressure switch
Cable clamp is placed in
the electronics compart-
ment of the power unit
P
NC
A
C
Cable bushing
(Power Unit)
Pressure switch
Pressure 25 mbar
P
COM
NC
Temperature - 90/120
o
C
Exhaust gas condenser
T
1
2
Safety box on BW4+
COM
B
GND
D
1
2
3
4
1
2
3
4
GND
E L E C T R O N I C S C O M PA R T M E N T I N T H E P O W E R U N I T
■
Detach cable
A
on the pressure switch
1-NC
and
3-COM
in the electronics com-
partment in the Power Unit and mount
1-NC (yellow)
on the
cable clamp (18)
in
3
and
3-COM (red)
on the
cable clamp (18)
in
4
.
■
Mount cable
C
in Terminal
1-NC (blue)
and
3-COM (brown)
on the pressure
switch in the electronics compartment in the Power Unit and mount
1-NC (blue)
on the
cable clamp (18)
in
1
and
3-COM (brown)
on the
cable clamp (18)
in
4
.
■
Mount the
cable clamp (18)
in the electronics compartment. To do this, loosen
the lower Allen screw on the flange of the pressure transmitter using a
3 mm
Allen key
. Place the
cable clamp (18)
over the hole and secure it and the flange
with the Allen screw.
S A F E T Y B O X O N T H E B W 4 +
■
Pull cable
B
through the cable bushing on the Power Unit and mount the cable
on the cable clamp in
1,
2
and
GND
.
■
Check that the safety temperature limiter (STB) is set to a max. of
120 °C
.
