installation manual

Table Of Contents

Making the electrical connections | 43

6 720 806 992 (2013/07)Greenstar

6.2.4 Connecting additional accessories

▶ For splash-proof (IP) strain relief, cut the grommet to match the

diameter of the cable.

Fig. 41 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.

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. 42 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).

Fig. 43 Mounting supply temperature sensor right next to boiler supply

[1] System secondary line – supply pipe 1-1/2"

[2] Supply temperature sensor for system supply pipe

[3] Boiler primary line – supply pipe 1"

[4] Boiler primary line – return pipe 1"

[5] System secondary line – return pipe 1-1/2"

Fig. 44 Electrical wiring of external supply temperature sensor

The service function 7.d connection of an external supply temperature

sensor is automatically set to 01 ( page 57).

6 720 641 933-91.1o

TB1

6 720 641 933-44.1O

LS NS

Supply temperature sensor for system supply pipe

( Fig. 43 [2]) must be installed in closest vicinity with

boiler supply Tee.

6 720 641 933-97.1o

≤ 4"

(102 mm)

6 720 612 664-25.2O