Elecrical connection
Greenstar FS/Combi FS – 6 720 810 590 (2020/04)
48
Fig. 44 Low voltage (LV) terminals (pre-wire links not shown)
[1] BUS - BUS connection to programmer
Fig. 45
[1] Terminal at the boiler reads BUS or BB, both indicating
connection of the 2-wired Bosch BUS system.
[2] Bosch Controller.
7.1.3 High voltage junction box
The high voltage installer junction box provides connections for mains
power, one system circulator pump and one DHW Tank Circulator pump.
Fig. 46
7.1.4 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. 48.
▶ Connect cable to the black plug according to Fig. 47.
Fig. 47 Attach plug (external pump)
[1] L (120VAC, 60Hz)
[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. 48 Cable connected (external pump)
Refer to
▶Use Service function 5.E, to set connection to 01 (DHW
recirculation pump).
-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 FW 200.
7.1.5 DHW tank loading pump or 3-way valve with spring return
(only heating boilers KBR..-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. 50.
▶ Connect cable to the red plug according to Fig. 49.
6720810590-57.1Wo (2014/11)
1
2
3
4
56
BUS
TT
Out Sen
DHW Sen
LWCO
6 720 810 590-82.1Wo
BUS
BUS/
BB
1)
2)
6720810590-58.1Wo
1
2
3
4
6 720 641 933-41.2O
6720810590-63.2Wo
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
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