Bosch ZBR 42-3 A NG User Manual

Electrical connection
Greenstar – 6721822579 (2021/01)
48
7.3.3 DHW tank loading pump or 3-way valve with spring return
(only ZBR...-3A)
The pump used must have the following connection values: 120 VAC,
max. 2 A.
▶ Route cable from pump or 3-way valve to appliance.
▶ Insert cable into the junction box as shown in Fig. 57.
▶ Connect cable to the red plug according to Fig. 56.
Fig. 56 Attach plug (external DHW tank loading pump or 3-way valve)
[1] L (120 VAC, 60 Hz)
[2] PE (GND, Ground)
[3] N (Neutral)
[4] Red plug (in the junction box upon delivery)
▶ Connect red plugs and insert grommet until stop.
Fig. 57 Cable connected (external DHW tank loading pump or 3-way
valve)
▶ Mount the 3-way valve for space heating operation when de-
energized, and DHW tank loading when energized.
▶ Use service function 1.F to set pump mode ( page 57).
7.3.4 Connecting mains power supply
▶ Route the power cable (AC 120 V, 60 Hz) from the emergency
shutoff switch to the boiler.
▶ Insert cable into the junction box as shown in Fig. 59.
▶ Connect cable to the white plug according to Fig. 58.
Fig. 58 Attach plug (mains power supply)
[1] L (120 VAC, 60 Hz)
[2] PE (GND, Ground)
[3] N (Neutral)
[4] White plug (in the junction box upon delivery)
▶ Connect white plugs and insert grommet until stop.
Fig. 59 Cable connected (mains power supply)
▶ Mount junction box on the rail.
1
2
3
4
6 720 641 933-37.2O
L
PE N
whit
e
Mains
120V/60
Hz
L PE N
r
e
d
Storage
tank pu
mp
L PE
N
b
lack
CH pump
for
mixed
heating
8
7
37 7
0
1
50
3
I
III
I
II III
6 720 641 933-38.1O
1
2
3
4
6 720 641 933-36.2O
L
PE
N
w
hi
t
e
Mains
120V/60
H
z
L PE N
r
e
d
Storage
tank pu
mp
L PE
N
b
lack
CH pump
for
mixed
heating
8
7
37 70
1
50
3
I
III
I
II III
6 720 641 933-38.1O

Bosch ZBR 42-3 A NG Specifications

General

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