Electrical Connections In The Junction Box (120 Vac); Mounting Rails For Junction Box; Connecting An External Heating Zone Pump Or Dhw Recirculation Pump - Bosch ZBR16-3A Series Installation And Service Instructions Manual

48 | Making the electrical connections
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.
LS NS
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.
6 720 806 992 (2015/03)
7.3

7.3.1 Mounting rails for junction box

▶ Hold the rail against the appliance from below (step 1) and fasten with
▶ Loosen junction box from the rail (step 3).
6 720 612 664-25.2O
Fig. 51 Mounting rails for junction box
7.3.2
Without accessories the appliance offers the connection of one heating
B
zone pump, one circulator of an unmixed heating circuit, or one DHW
B
4
recirculation pump.
2
The pump used must have the following connection values: 120 VAC,
1
max. 2 A.
F
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.
6 720 641 933-70.2O
Fig. 52 Attach plug (external pump)
[1]
[2]
[3]
[4]

Electrical connections in the junction box (120 VAC)

the screws from the outside or inside (step 2).
2
3
Connecting an external heating zone pump or DHW
recirculation pump
L (120 VAC, 60 Hz)
PE (GND, Ground)
N (Neutral)
Black plug (in the junction box upon delivery)
2
1
6 720 641 933-42.3O
1
2
3
4
6 720 641 933-41.2O
Greenstar