Bosch ZBR16-3A Series - Electrical Connections in the Junction Box (120 VAC); Mounting Rails for Junction Box; Connecting an External Heating Zone Pump or DHW Recirculation Pump

48 | Making the electrical connections
Greenstar6 720 806 992 (2015/03)
Fig. 49 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 63).
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. 50 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.
7.3 Electrical connections in the junction box (120 VAC)
7.3.1 Mounting rails for junction box
▶ Hold the rail against the appliance from below (step 1) and fasten with
the screws from the outside or inside (step 2).
▶ Loosen junction box from the rail (step 3).
Fig. 51 Mounting rails for junction box
7.3.2 Connecting an external heating zone pump or DHW
recirculation pump
Without accessories the appliance offers the connection of one heating
zone pump, one circulator of an unmixed heating circuit, or one DHW
recirculation pump.
The pump used must have the following connection values: 120 VAC,
max. 2 A.
▶ Route cable from pump to appliance.
▶ Insert cable into the junction box as shown in Fig. 53.
▶ Connect cable to the black plug according to Fig. 52.
Fig. 52 Attach plug (external pump)
[1] L (120 VAC, 60 Hz)
[2] PE (GND, Ground)
[3] N (Neutral)
[4] Black plug (in the junction box upon delivery)
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
6 720 641 933-42.3O
3
2
2
1
1
2
3
4
6 720 641 933-41.2O