Bosch WORCESTER GREENSTAR WIRING CENTRE, Installation, Commissioning & Servicing Instructions

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INSTALLATION
6 720 804 107 (2012/10) 12
TWO CENTRAL HEATING CIRCUITS WITHOUT ELECTRONIC MIXING VALVES AND ONE DOMESTIC HOT WATER CYLINDER CIRCUIT:
Fig. 23 Two heating circuits and one domestic hot water cylinder circuit
Earth conductor
L Phase (230 V AC)
N Neutral conductor
Switches:
I Code switch I – system type
II Temperature switch II – domestic hot water cylinder
temperature
Terminal identification:
230 V AC Mains voltage
BUS
BUS EMS plus
IZ1 No function
IZ2...3 Room thermostat ( I nput Z one)
IZ4 No function
MD1 No function
OS1 No function
PZ1 Cylinder primary pump
PZ2...3 Circulating pump or ( P ump Z one)
T0 Flow temperature sensor to the low-loss header ( T emperature
sensor); optional
T1 No function
TC1 Cylinder temperature sensor ( T emperature sensor C ylinder)
System component:
230 V AC Mains voltage
BUS
BUS EMS plus (connection between the Greenstar Wiring
Centre and boiler)
GWC Greenstar Wiring Centre
P1 Cylinder primary pump ( P ump DHW)
PZ2...8 Circulating pump in each heating circuit ( P ump Z one);
allocation of heating circuits 2 and 3 or 7 and 8 according to
coding (

chapter 4, page 13)
T0 Flow temperature sensor at low-loss header ( T emperature
sensor); optional
TC1 Cylinder temperature sensor ( T emperature sensor C ylinder)
TZ2...8 Room thermostat ( T hermostat room temperature Z one);
allocation of heating circuits 2 and 3 or 7 and 8 according to
coding (

chapter 4, page 13)
*) The marked system components are connected to the module
with coding 4 (coding

chapter 4, page 13).
1) Each of the thermostats TZ2...8 must be of a “programmable
room thermostat” type and compatible with 230 V AC operation.
Observe the coding of the modules (

chapter 4, page 13).
GWC
TC1
T0
P1
PZ2
PZ7* PZ3
PZ8*
TZ2
TZ7* TZ3
TZ8*
1) 1)
6 720 804 107-21.1O
1 2 1 2 1 2
TC1 T0 BUS BUS
1 2
BUS
1 2 3 1
OS1
2 1 2
MD1
1 2
T1
≤ 24 V
N L N L N IN L IN L IN L IN L
120/230VAC 120/230VAC
IZ1 IZ2 IZ3 IZ4
120/230 V AC
N N 43 N 14 14
PZ2 PZ3 PZ1
120/230 V AC
230 V AC 230 V AC
L N L N
BUS TC1 T0
M
P1
N L
L N
N
M
PZ2
PZ7*
N L
L
M
PZ3
PZ8*
N L
L N
TZ2
TZ7*
L S
TZ3
TZ8*
L S
I II II
0
1
2
3
4
S
Y off off
40 40
50 50 60 60
70 70
max max