Install Instructions

48 | Making the electrical connections
Greenstar6 720 806 992 (2013/09)
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.
Fig. 49 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.
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. 50 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. 52.
▶ Connect cable to the black plug according to Fig. 51.
Fig. 51 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. 52 Cable connected (external pump)
▶ Use service function 5.E, to set connection to 01 (DHW recirculation
pump) ( page 62)
-or-
▶ Use service function 5.E to set connection to 02 (external heating
zone pump in an unmixed heating circuit) ( page 62).
-or-
▶ Use service function 5.E to set connection to 03 (external heating
pump) ( page 62).
6 720 641 933-70.2O
B
B
4
2
1
F
A
LS NS
LZ
NZ
9
8
7
1
2
ϑ
6 720 641 933-42.3O
3
2
2
1
The DHW recirculation pump is controlled by the Bosch
FW 200.
1
2
3
4
6 720 641 933-41.2O
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
6 720 641 933-40.1O