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

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INSTALLATION
6 720 804 107 (2012/10) 10
TWO-PORT VALVE (S-PLAN) SYSTEM:
Fig. 21 Two-port valve system
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 DHW 2-port valve end switch
IZ2 Central heating 2-port valve end switch
IZ3 Room thermostat ( I nput Z one;

: Temperature/temperature
sensor)
IZ4 Frost thermostat (

: Temperature/temperature sensor)
MD1 No function
OS1 No function
PZ1 DHW 2-port valve motor
PZ2 Central heating 2-port valve motor
PZ3 Circulating pump ( P ump Z one)
T0 No function
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)
CZ1 2-port valve end switch, switch at valve for DHW ( C ontact
Z one)
CZ2 2-port valve end switch, switch at valve for central heating
(
C ontact Z one)
GWC Greenstar Wiring Centre
HS Boiler ( H eat S ource)
PHS Circulating pump ( P ump H eat S ource)
TC1 Cylinder temperature sensor ( T emperature sensor C ylinder)
TR3 Room thermostat ( T hermostat R oom temperature); optional;
not shown in fig. 21
TF4 Frost thermostat ( T hermostat F rost protection); optional; not
shown in fig. 21
VZ1 2-port valve for DHW ( V alve Z one)
VZ2 2-port valve for central heating ( V alve Z one)
HS
GWC
PHS
TC1
VZ1
CZ1
VZ2
CZ2
6 720 804 107-19.1O
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
M
VZ1
N L
L N
N
M
VZ2
N L
L
M
PHS
N L
L N
CZ1 CZ2 TR3
L S
TF4
L S
I II II
0
1
2
3
4
S
Y off off
40 40
50 50 60 60
70 70
max max