Bosch ZBR28-3A - DHW Tank Loading Pump or 3-Way Valve; Zbr; Connecting Mains Power Supply

56 | Making the electrical connections
Copyright (optional information)6 720 643 068 (2011/06)
6.3.3 DHW tank loading pump or 3-way valve with
spring return (only heating boiler ZBR..-3A)
The pump used must have the following connection
values: 120 VAC, max. 2 A.
B Route cable from pump or 3-way valve to appliance.
B Insert cable into the junction box as shown in Fig. 48.
B Connect cable to the red plug according to Fig. 47.
Fig. 47 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)
B Connect red plugs and insert grommet until stop.
Fig. 48 Cable connected (external DHW tank loading pump
or 3-way valve)
B Mount the 3-way valve for space heating operation
when de-energized, and DHW tank loading when
energized.
B Use service function 1.F to set pump mode.
(Æ page 67).
6.3.4 Connecting mains power supply
B Route the power cable (AC 120 V, 60 Hz) from the
emergency shutoff switch to the boiler.
B Insert cable into the junction box as shown in Fig. 50.
B Connect cable to the white plug according to Fig. 49.
Fig. 49 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)
B Connect white plugs and insert grommet until stop.
Fig. 50 Cable connected (mains power supply)
B Mount junction box on the rail.
1
2
3
4
6 720 641 933-37.1O
L PE N
white
Mains
120V/60Hz
L PE N
red
Storage
tank pump
L PE N
black
CH pump
for mixed heating
8 737 701 503
I III III III
6 720 641 933-38.1O
1
2
3
4
6 720 641 933-36.1O
L PE N
white
Mains
120V/60Hz
L PE N
red
Storage
tank pump
L PE N
black
CH pump
for mixed heating
8 737 701 503
I III III III
6 720 641 933-39.1O