Bosch ZBR 42-3 A NG User Manual

Electrical connection
47
Greenstar – 6721822579 (2021/01)
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. 53 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. 55.
▶Connect cable to the black plug according to Fig. 54.
Fig. 54 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)
▶ Connect black plugs and insert grommet until stop.
Fig. 55 Cable connected (external pump)
▶ Use service function 5.E, to set connection to 01 (DHW recirculation
pump) ( page 59).
-or-
▶ Use service function 5.E to set connection to 02 (external heating
zone pump in an unmixed heating circuit).
-or-
▶ Use service function 5.E to set connection to 03 (external heating
pump).
The DHW recirculation pump is controlled by the Bosch Room Controller.
6 720 641 933-42.3O
3
2
2
1
1
2
3
4
6 720 641 933-41.2O
L
PE N
whit
e
M
ains
120V/60
H
z
L
P
E
N
r
ed
Stor
ag
e
ta
nk
p
ump
L PE N
black
CH
pum
p
for mixed heating
8
73
7 70
1
503
I III III III
6 720 641 933-40.1O

Bosch ZBR 42-3 A NG Specifications

General

Brand	Bosch
Model	ZBR 42-3 A NG
Category	Boiler
Language	English