Bosch Greenstar Series - Page 46

Electrical connection
Greenstar – 6721822579 (2021/01)
46
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).
Supply temperature sensor for system supply pipe(Fig 50, [2]) must be
installed in closest vicinity with boiler supply Tee.
Fig. 50 Mounting supply temperature sensor right next to boiler supply
[1] System secondary line – supply pipe
[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
Fig. 51 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 60).
Connecting Third party room thermostats or zone controls
A voltage free (dry contact) third party room thermostat or heat demand
from a relay panel can be used to send an ON/OFF signal to the
appliance.
Fig. 52 Electrical wiring third party room thermostat or zone control
To communicate a heat demand the third party room thermostat or zone
control must connect pins 2 and 4.
6 720 641 933-97.1o
ϑ
1
2
3
4
5
≤ 4"
(102 mm)
6 720 612 664-25.2O
6 720 641 933-70.2O
B
B
4
2
1
F
A
LS NS
LZ
NZ
9
8
7
1
2
ϑ