Connecting The Dhw Tank Temperature Sensor (Only Heating Boiler Zbr; Connecting Additional Accessories - Bosch ZBR16-3A Series Installation And Service Instructions Manual

7.2.3 Connecting the DHW tank temperature sensor (only
heating boiler ZBR..-3A)
Wire the DHW tank temperature sensor directly to the appliance
terminals. The sensor is provided with the appliance.
Do not exceed a sensor cable length of 33 feet (10 m).
▶ Punch out plastic insert.
▶ Plug connector into the circuit board.
▶ Insert the cable of the DHW tank temperature sensor.
▶ Secure the cable with the strain relief.
Fig. 45 Electrical connections DHW tank temperature sensor

7.2.4 Connecting additional accessories

▶ For splash-proof (IP) strain relief, cut the grommet to match the
diameter of the cable.
Fig. 46 Cut off grommets
▶ Feed cable through strain relief and connect accordingly.
▶ Secure the cable on the strain relief.
Bosch room controls
Connect only Bosch room controls to the internal BUS of this boiler.
For installation and electrical connection of the FB 100 remote control,
see installation instructions for the remote control.
Greenstar
Connecting temperature guard TB 1 (external manual reset high
limit or low water cut off (LWCO))
This connection allows the installation of external safety switches.
• External manual reset high limit
• Low water cut-off (LWCO)
• Radiant overheat protection
Fig. 47 Electrical wiring TB1
When the temperature guard trips, central heating and DHW modes are
interrupted.
Connecting the supply temperature sensor (e.g. for low-loss header
or system supply pipe)
Do not exceed a sensor cable length of 33 feet (10 m).
6 720 641 933-73.1O
6 720 641 933-91.1o
Fig. 48 Mounting supply temperature sensor right next to boiler supply
[1]
[2]
[3]
[4]
[5]
Making the electrical connections | 47
LS NS
Supply temperature sensor for system supply pipe
( Fig. 48 [2]) must be installed in closest vicinity with
boiler supply Tee.
3
2
1
ϑ
≤ 4"
(102 mm)
System secondary line – supply pipe
Supply temperature sensor for system supply pipe
Boiler primary line – supply pipe 1"
Boiler primary line – return pipe 1"
System secondary line – return pipe
B
B
4
2
1
F
A
TB1
6 720 641 933-44.2O
4
5
6 720 641 933-97.1o
6 720 806 992 (2015/03)