Bosch WORCESTER GREENSTAR Manual page 13

3 central heating circuits without electronic mixing valves:
GWC
N L N L N L
M M M
PZ1 PZ2 PZ3
PZ4* PZ5* PZ6*
Fig. 24 3 heating circuits without electronic mixing valves
Earth lead
L Phase (mains voltage)
N Neutral conductor
Switch:
I Code switch I – system type
II Temperature switch II – domestic hot water cylinder
temperature
Terminal identification:
230 V AC Mains voltage
BUS EMS 2 BUS
IZ1...3 Room thermostat
(Input Zone; : temperature/temperature sensor)
IZ4 No function
MD1 No function
OS1 No function
PZ1...3 DHW circulation pump (Pump Zone)
T0 Flow temperature sensor for the low-loss header
(Temperature sensor); optional
T1 No function
TC1 No function
GREENSTAR WIRING CENTRE – 6720880441 (2018/01)
TZ1
TZ4*
PZ1
PZ4*
T0
120/230 V AC
PZ1 PZ2 PZ3
N 14 N 43 N 14
N L L N
N
120/230 V AC
IZ1 IZ2 IZ3 IZ4
120/230VAC 120/230VAC
N L N L N L IN L IN L IN L IN
N L N L
N L S L S L S
1) 1) 1)
230 V AC 230 V AC TZ1 TZ2 TZ3
TZ4* TZ5* TZ6*
1) 1)
TZ2
TZ5*
PZ2
PZ5*
4 50 50 60 60
3
2 40 40 70 70
1 S
Y off off max max
0
I II II
L
24 V
TC1 T0 T1 OS1 MD1 BUS BUS
1 2 1 2 1 2 1 2 3 1 2 1 2 1 2
T0
System components:
230 V AC Mains voltage
BUS EMS 2 BUS
(connection between Greenstar Wiring Centre and boiler)
GWC Greenstar Wiring Centre
PZ1...6 DHW circulation pump in each heating circuit (Pump Zone);
allocation of heating units 1, 2 and 3 or 4, 5 and 6 according
to coding ( chapter 4, page 15)
T0 Flow temperature sensor at the low-loss header
(Temperature sensor); optional
Room thermostat (Thermostat room temperature Zone; :
TZ1...6
temperature/temperature sensor); allocation of heating
circuits 1, 2 and 3 or 4, 5 and 6 according to coding
( chapter 4, page 15)
*) The marked system components are connected to the
module with coding 3 (coding  chapter 4, page 15).
1) Thermostats TZ1 to 6 must be programmable room
thermostats and compatible with 230 V AC operation. Pay
attention to the module codes ( chapter 4, page 15).
1)
TZ3
TZ6*
PZ3
PZ6*
BUS
1 2
BUS
0010016319-001
Installation
13