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Worcester wiring guideGreenstar gas-fired boilers
Contents
Introduction Page 4
Greenstar Ri Regular Page 5
Greenstar CDi Regular Page 17
Greenstar CDi System Page 29
Greenstar CDi Combi Page 42
Greenstar FS CDi Regular Page 53
Greenstar HF CDi Combi Page 65
Greenstar Si Combi Page 71
Greenstar i Junior Combi Page 82
Greenstar i System Page 93
Notes Page 105
Page 3Worcester wiring guide Greenstar gas-fired boilers
Page 4 Worcester wiring guide Greenstar gas-fired boilers
Introduction
NEW COMPLETE SYSTEM INSTALLATIONSIf a new complete heating system installation is in a new build property or it is
a first time installation in an existing property, then the heating system must
conform to current building regulations Part L1a. All new heating systems in
dwellings must have at least two heating zones. Each of these zones will be
controlled by a thermostat and zone valve. An alternative would be individual
electronically controlled TRVs. If the hot water is provided from a storage
system then the DHW cylinder will require separate time and temperature
control. All radiators must have TRVs fitted in all rooms except bathrooms and
rooms with thermostats. The exception to this are single storey, open plan
dwellings where the living area is more than 70% of the total useable floor
area. Then this type of dwelling can be controlled as one zone.
EXISTING INSTALLATIONS
For boiler replacements on an existing system, it is not necessary to zone the
upstairs and downstairs differently, compliance with the zone requirements
can be achieved by a single room thermostat or programmable room
thermostat. While the system is drained down, TRVs may be fitted to all
rooms except the bathrooms and the room with the thermostat.
Page 5Worcester wiring guide Greenstar gas-fired boilers
Greenstar Ri Regular2 x 2 Port Valves (S-Plan)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
Room T/Stat
L
N
Time Controller
HW
ON
CH
ON
M~L
NE
M~L
NE
CylinderZone Valve
HeatingZone Valve
External Pump
L
EN
reset max
L N LPNPLR
GreenstarRi Regular
Double PoleFused Spur
L
EN
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
External Pump
L
EN
reset max
L N LPNPLR
GreenstarRi Regular
Double PoleFused Spur
L
EN
230V MainsVoltage
CylinderT/Stat
Green/YellowBlueWhiteGreyOrange
EN
Mid PositionValve
L
N
Time Controller
HW
OFF
HW
ON
CH
ON
C
1 2
L N E 4 5 6 7 8 9 10
N
Room T/Stat
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
Page 6 Worcester wiring guide Greenstar gas-fired boilers
Greenstar Ri RegularMid Position Valve (Y-Plan)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
External Pump
L
EN
reset max
L N LPNPLR
GreenstarRi Regular
Double PoleFused Spur
L
EN
230V MainsVoltage
CylinderZone Valve
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
M~L
NE
HeatingZone 1 Valve
M~L
NE
Room T/StatZone 1
M~L
NE
HeatingZone 2 Valve
N
Room T/StatZone 2
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
CH
Zon
e 2
ON
L
N
Time Controller3 Channel
HW ON
CH Zone 1 ON
Page 7Worcester wiring guide Greenstar gas-fired boilers
Greenstar Ri Regular3 x 2 Port Valves (S-Plan Plus)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
External Pump
L
EN
reset max
L N LPNPLR
GreenstarRi Regular
Double PoleFused Spur
L
EN
230V MainsVoltage
Room T/StatZone 1
HeatingZone 1 Valve
L
N
Time Controller
CH
Zon
e 1
ON
CH
Zon
e 2
ON
N
L N E 4 5 6 7 8 9 10
M~L
NE
M~L
NE
HeatingZone 2 Valve
N
Room T/StatZone 2
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
Page 8 Worcester wiring guide Greenstar gas-fired boilers
Greenstar Ri Regular2 x Radiator Heating Zones
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
External Pump
L
EN
reset max
L N LPNPLR
GreenstarRi Regular
Double PoleFused Spur
L
EN
230V MainsVoltage
Room T/StatZone 1
HeatingZone 1 ValveC
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
M~L
NE
M~L
NE
CylinderZone Valve
Underfloor ControlsWiring Centre
ENL
L N E Demand
L
N
Time ControlerTwin Channel
HW
ON
CH
Zon
e 1
ON
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
Page 9Worcester wiring guide Greenstar gas-fired boilers
Greenstar Ri Regular2 x 2 Port Valves & Underfloor Heating
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
External Pump
L
EN
reset max
L N LPNPLR
GreenstarRi Regular
Double PoleFused Spur
L
EN
230V MainsVoltage
Room T/StatRadiators Zone
RadiatorsZone Valve
N
L N E 4 5 6 7 8 9 10
M~L
NE
Underfloor ControlsWiring Centre
ENL
L N E Demand
L
N
Time ControllerSingle Channel
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
Page 10 Worcester wiring guide Greenstar gas-fired boilers
Greenstar Ri RegularZoned Radiator & Underfloor Heating
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
External Pump
L
EN
reset max
L N LPNPLR
GreenstarRi Regular
Double PoleFused Spur
L
EN
230V MainsVoltage
C
1 2
L N E 4 5 6 7 8 9 10
CylinderT/Stat
L
N
Time ControllerSingle Channel
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
Page 11Worcester wiring guide Greenstar gas-fired boilers
Greenstar Ri RegularSingle Hot Water Zone (Vented Cylinder)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
External Pump
L
EN
reset max
L N LPNPLR
GreenstarRi Regular
Double PoleFused Spur
L
EN
230V MainsVoltage
L N E 4 5 6 7 8 9 10
L
N
Time ControllerSingle Channel
N
Room T/Stat
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
Page 12 Worcester wiring guide Greenstar gas-fired boilers
Greenstar Ri RegularSingle Heating Zone
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
reset max
L N LPNPLR
GreenstarRi Regular
Double PoleFused Spur
L
EN
N
NN
N
CH onCH onHW on
HW onN
N
L3
4
L
L
L
L
L
L
S/L
NO
NO
NO
N/U = Not Used
BOILER
2.5A Fuse - RS Components stock no 415-604
Warning! 240V - Isolate electrical supplybefore removing wiring centre cover.
HW PUMP
CH PUMP
PROGRAMMER
FROST T/STAT
ROOM T/STAT
CYLINDERT/STAT
FUSE2.5A
Frost T/Stat(if required)
Room T/Stat
HW Pump
CHPump
CH/HWProgrammer
Cylinder T/Stat
UPP 15-50 PUMP PLAN - WIRING CENTRE CONNECTIONS
(N/U)
(N/U)
(N/U)
1
1
1
2
2
2
(N/U)
N
(N/U)(N/U)
(N/U)
N
N
C
C
Demand
Deman
d
Deman
d
C
P/L
N
L
230V MainsVoltage
Earth terminal for:Controls, Boiler, PumpsElectrical Mains Supply
Page 13Worcester wiring guide Greenstar gas-fired boilers
Greenstar Ri RegularGrundfoss Pump Plan
IMPORTANT NOTEThe pump over-run of the pump plan module, causes the hot water pump to run regardless of thehot water cylinder demand, to dissipate boiler heat. Worcester will only recommend theGrundfoss pump plan system on a vented cylinder.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
MA
INS
BO
ILERPU
MP
SMARTFIT FROSTPROTECTION
ROOM
PORTACCESSORY
S PLAN
A
CHVALVE
(S)CYLINDERSENSOR
SMARTFITROOM UNIT
POLARITYFREE
3 PORTVALVE
(Y)
HWVALVE
(S)
Y PLAN
UNIT
HW VALVE (S)
CH VALVE (S) CYLINDERT/STAT
reset max
L N LPNPLR
GreenstarRi Regular
External Pump
L
EN
Double PoleFused Spur
L
EN
L
N
LSL
PL N
N
L
Smartfit Layout:Example shown S Plan configuration
230V MainsVoltage
Page 14 Worcester wiring guide Greenstar gas-fired boilers
Greenstar Ri RegularSmartfit Control Pack
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
reset max
L N LPNPLR
GreenstarRi Regular
reset max
L N LPNPLR
GreenstarRi Regular
Shunt Pump
Junction Box/Wiring CentreSwitched Live/
DemandN EL
Double PoleFused Spur
L
EN
L
EN
C C
Shunt Pump
L
EN
C
NO
NC
230V ACDouble Pole Relay
Header LimitThermostat
Wiring from Zone/s Controls
Example relay shown is a Double Pole Mains Voltage Relay. This isolates the Boilers electrically in case of a fault condition.
IMPORTANT NOTE:The Relay should be mounted within a suitable electrically safe housing.
C C
NC NCNO NO
CoilLive
CoilNeutral
230V MainsVoltage
Page 15Worcester wiring guide Greenstar gas-fired boilers
Greenstar Ri RegularCascaded boilers with low loss header
NOTEA pump must be wired to each boiler for pump over-run to dissipate heat from within the boiler.The connections are Live of pump to LP and Neutral of pump to NP and the Earth of the pump tothe Earth point of each boiler.
HEADER LIMIT THERMOSTATThis cuts the Demand to the boilers in the event of excessive temperature within the Header dueto lack of circulation. Ideally this should be set to 90º C.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
reset max
GreenstarRi Regular
C
1 2
N CylinderT/Stat
Room T/Stat
L
N
Time Controller
HW
ON
CH
ON
HeatingZone Valve
L
EN
External Pump
Double PoleFused Spur
L
EN
L N E 4 5 6 7 8 9 10
Pipe T/StatFrost T/Stat
L N LPNPLR
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
Page 16 Worcester wiring guide Greenstar gas-fired boilers
Greenstar Ri RegularFrost Protection
NOTEA frost thermostat is normally used to protect locations which have no heat source e.g. a garage.It is recommended that a pipe thermostat is also used (wired in series with the frost thermostat)to avoid long periods of heat demand if the air temperature does not satisfy the frost thermostat.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstar CDi Regular
L NSN LS LR
LZ NZ
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
Room T/Stat
L
N
Time Controller
HW
ON
CH
ON
M~L
NE
M~L
NE
CylinderZone Valve
HeatingZone Valve
Double PoleFused Spur
L
EN
L
EN
E
External Pump
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 17Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi Regular2 x 2 Port Valves (S-Plan)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstar CDi Regular
L NSN LS LR
LZ NZ
Double PoleFused Spur
L
EN
L
EN
E
CylinderT/Stat
Green/YellowBlueWhiteGreyOrange
EN
Mid PositionValve
L
N
Time Controller
HW
OFF
HW
ON
CH
ON
C
1 2
N
Room T/Stat
L N E 4 5 6 7 8 9 10
External Pump
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 18 Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi RegularMid Position Valve (Y-plan)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstar CDi Regular
L NSN LS LR
LZ NZ
External Pump
Double PoleFused Spur
L
EN
L
EN
E
CylinderZone Valve
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
M~L
NE
HeatingZone 1 Valve
M~L
NE
Room T/StatZone 1
M~L
NE
HeatingZone 2 Valve
N
Room T/StatZone 2
CH
Zon
e 2
ON
L
N
Time Controller3 Channel
HW ON
CH Zone 1 ON
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 19Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi Regular3 x 2 Port Valves (S-Plan Plus)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Room T/StatZone 1
HeatingZone 1 Valve
L
N
Time Controller
CH
Zon
e 1
ON
CH
Zon
e 2
ON
Greenstar CDi Regular
L NSN LS LR
LZ NZ
Double PoleFused Spur
L
EN
L
EN
E
N
L N E 4 5 6 7 8 9 10
M~L
NE
M~L
NE
HeatingZone 2 Valve
N
Room T/StatZone 2
External Pump
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 20 Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi Regular2 x Radiator Heating Zones
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Room T/StatZone 1
HeatingZone 1 Valve
Greenstar CDi Regular
L NSN LS LR
LZ NZ
Double PoleFused Spur
L
EN
L
EN
E
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
M~L
NE
M~L
NE
CylinderZone Valve
Underfloor ControlsWiring Centre
ENL
L N E Demand
L
N
Time ControllerTwin Channel
HW
ON
CH
Zon
e 1
ON
External Pump
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 21Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi Regular2 x 2 Port Valves & Underfloor Heating
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Room T/statRadiators Zone
RadiatorsZone Valve
Greenstar CDi Regular
L NSN LS LR
LZ NZ
External Pump
Double PoleFused Spur
L
EN
L
EN
E
N
L N E 4 5 6 7 8 9 10
M~L
NE
Underfloor ControlsWiring Centre
ENL
L N E Demand
L
N
Time ControllerSingle Channel
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 22 Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi RegularZoned Radiator & Underfloor Heating
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
External Pump
C
1 2
L N E 4 5 6 7 8 9 10
CylinderT/Stat
Greenstar CDi Regular
L NSN LS LR
LZ NZ
Double PoleFused Spur
L
EN
L
EN
EL
N
Time ControllerSingle Channel
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 23Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi RegularSingle Hot Water Zone (Vented Cylinder)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
External Pump
L N E 4 5 6 7 8 9 10
Greenstar CDi Regular
L NSN LS LR
LZ NZ
Double PoleFused Spur
L
EN
L
EN
EL
N
Time ControllerSingle Channel
N
Room T/Stat
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 24 Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi RegularSingle Heating Zone
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstar CDi Regular
L NSN LS LR
LZ NZ
Double PoleFused Spur
L
EN
N
NN
N
CH onCH onHW on
HW onN
N
L3
4
L
L
L
L
L
L
S/L
NO
NO
NO
N/U = Not Used
BOILER
2.5A Fuse - RS Components stock no 415-604
Warning! 240V - Isolate electrical supplybefore removing wiring centre cover.
HW PUMP
CH PUMP
PROGRAMMER
FROST T/STAT
ROOM T/STAT
CYLINDERT/STAT
FUSE2.5A
Frost T/Stat(if required)
Room T/Stat
HW Pump
CHPump
CH/HWProgrammer
CylinderT/Stat
UPP 15-50 PUMP PLAN - WIRING CENTRE CONNECTIONS
(N/U)
(N/U)
(N/U)
1
1
1
2
2
2
(N/U)
N
(N/U)(N/U)
(N/U)
N
N
C
C
Demand
Deman
d
Deman
d
C
P/L
N
L
230V MainsVoltage
Earth terminal for:Controls, Boiler, PumpsElectrical Mains Supply
Page 25Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi RegularGrundfoss Pump Plan
IMPORTANT NOTEThe pump over-run of the pump plan controls, causes the hot water pump to run regardless of thehot water cylinder demand, to dissipate boiler heat. Worcester would only recommend theGrundfoss pump plan system on a vented cylinder.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstar CDi Regular
L NSN LS LR
LZ NZ
MA
INS
BO
ILERPU
MP
SMARTFIT FROSTPROTECTION
ROOM
PORTACCESSORY
S PLAN
A
CHVALVE
(S)CYLINDERSENSOR
SMARTFITROOM UNIT
POLARITYFREE
3 PORTVALVE
(Y)
HWVALVE
(S)
Y PLAN
UNIT
HW VALVE (S)
CH VALVE (S) CYLINDERT/STAT
External Pump
L
EN
N
N
L
Smartfit Layout:Example shown S Plan configurationDouble Pole
Fused Spur
L
EN
L
N
L
SL
PL
230V MainsVoltage
Page 26 Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi RegularSmartfit Control Pack
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
LZ NZ
Greenstar CDi Regular
Greenstar CDi Regular
L NSN LS LR
LZ NZ
Shunt Pump
Junction Box/Wiring CentreSwitched Live/
DemandN EL
Double PoleFused Spur
L
EN
L
EN
C C
Shunt Pump
L
EN
C
NO
NC
230V ACDouble Pole Relay
Header LimitThermostat
Wiring from Zone/s Controls
Example relay shown is a double pole mains voltage relay. This isolates the boilers electrically in case of a fault condition.
IMPORTANT NOTE:The relay should be mounted within a suitable electrically safe housing.
C C
NC NCNO NO
CoilLive
CoilNeutral
230V MainsVoltage
Page 27Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi RegularCascaded boilers with low loss header
NOTEA pump must be wired to each boiler for pump over-run function to dissipate heat from within theboiler. The connections are pump live to Lz, pump neutral to Nz and pump earth to the Earthpoint of each boiler.
HEADER LIMIT THERMOSTATThis cuts the Demand to the boilers in the event of excessive temperature within the Header dueto lack of circulation. Ideally this should be set to 90ºC.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstar CDi Regular
L NSN LS LR
LZ NZ
Double PoleFused Spur
L
EN
Neutral Feed to Wiring Centre
Earth to Wiring Centre
Live Feed to Wiring Centre
Switch Live from Wiring Centre
FR FS NP LP
Frost T/Stat
L
EN
External Pump
230V MainsVoltage
Page 28 Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi RegularFrost Protection
The boiler has inbuilt frost protection. When the primary temperature drops below 8°C the pump is switchedon. When then temperature rises above 9°C the pump switches off after a 3 minute pump overrun. If theprimary temperature drops below 5°C, a central heating demand is activated until the primary temperaturerises above 12 °C. The demand switches off followed by the pump after a 3 minute overrun.
The boiler has the facility to connect an external frost protection device to protect in “at risk areas” (terminalblock ST6, contacts FS and FR). This is used if the boiler is not located in the area needing protection i.e. boilerin kitchen but pipe work in the garage that needs frost protection.
If external frost thermostat is calling, i.e. temperature within frost thermostat below the set point, but theprimary temperature of the boiler is above 5°C, the pump will run until the temperature within the frostthermostat rises above the set point. If external frost thermostat is calling and the primary temperature isbelow 5°C, a central heating demand is activated until primary temperature is above 12 °C. If the frostthermostat is still calling the pump will run until the temperature within the frost thermostat location risesabove the set point.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
Room T/Stat
L
N
Time Controller
HW
ON
CH
ON
M~L
NE
M~L
NE
CylinderZone Valve
HeatingZone Valve
Greenstar CDi System
L NSN LS LR
Double PoleFused Spur
L
EN
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 29Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi System2 x 2 Port Valves (S-Plan)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
Double PoleFused Spur
L
EN
CylinderT/Stat
Green/YellowBlueWhiteGreyOrange
EN
Mid PositionValve
L
N
Time Controller
HW
OFF
HW
ON
CH
ON
C
1 2
N
Room T/Stat
L N E 4 5 6 7 8 9 10
Greenstar CDi System
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 30 Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi SystemMid Position Valve (Y-Plan)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
Double PoleFused Spur
L
EN
CylinderZone Valve
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
M~L
NE
HeatingZone 1 Valve
M~L
NE
Room T/StatZone 1
M~L
NE
HeatingZone 2 Valve
N
Room T/StatZone 2
Greenstar CDi System
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
CH
Zon
e 2
ON
L
N
Time Controller3 Channel
HW ON
CH Zone 1 ON
Page 31Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi System3 x 2 Port Valves (S-Plan Plus)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Room T/StatZone 1
HeatingZone 1 Valve
L
N
Time Controller
CH
Zon
e 1
ON
CH
Zon
e 2
ON
L NSN LS LR
Double PoleFused Spur
L
EN
N
L N E 4 5 6 7 8 9 10
M~L
NE
M~L
NE
HeatingZone 2 Valve
N
Room T/StatZone 2
Greenstar CDi System
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 32 Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi System2 x Heating Zones
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Room T/StatZone 1
HeatingZone 1 ValveL NSN LS LR
Double PoleFused Spur
L
EN
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
M~L
NE
M~L
NE
CylinderZone Valve
Underfloor ControlsWiring Centre
ENL
L N E Demand
L
N
Time ControllerTwin Channel
HW
ON
CH
Zon
e 1
ON
Greenstar CDi System
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 33Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi System2 x 2 Port Valves & Underfloor Heating
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Room T/StatRadiators Zone
RadiatorsZone ValveL NSN LS LR
Double PoleFused Spur
L
EN
N
L N E 4 5 6 7 8 9 10
M~L
NE
Underfloor ControlsWiring Centre
ENL
L N E Demand
L
N
Time ControllerSingle Channel
Greenstar CDi System
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 34 Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi SystemZoned Radiator & Underfloor
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
C
1 2
L N E 4 5 6 7 8 9 10
CylinderT/Stat
L NSN LS LR
Double PoleFused Spur
L
EN
L
N
Time ControllerSingle Channel
Greenstar CDi System
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 35Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi SystemSingle Hot Water Zone (Vented Cylinder)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L N E 4 5 6 7 8 9 10
L NSN LS LR
Double PoleFused Spur
L
EN
L
N
Time ControllerSingle Channel
N
Room T/StatGreenstar
CDi System
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 36 Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi SystemSingle Heating Zone
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
MA
INS
BO
ILERPU
MP
SMARTFIT FROSTPROTECTION
ROOM
PORTACCESSORY
S PLAN
A
CHVALVE
(S)CYLINDERSENSOR
SMARTFITROOM UNIT
POLARITYFREE
3 PORTVALVE
(Y)
HWVALVE
(S)
Y PLAN
UNIT
HW VALVE (S)
CH VALVE (S) CYLINDERT/STAT
N
N
L
Smartfit Layout:Example shown S Plan configurationDouble Pole
Fused Spur
L
EN
L
N
L
SL
PL
Greenstar CDi System
230V MainsVoltage
Page 37Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi SystemSmartfit Control Pack
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
78
9
LNS NLSLR FSFR NP LP
ST10 ST19NOTE:Leave link
NOTE:Leave link
SAFETY LIMITTHERMOSTAT
CYLINDERTHERMOSTAT
230V MAINSSUPPLY
N E L
ST6
ST8
Gre
en\Y
ello
w
Connector Block
(made safe)
Bro
wn
Bro
wn
Blu
e
IMPORTANT NOTE:UNDER NO CIRCUMSTANCES SHOULD THE FEED TO THE LIMIT STAT BE TAKEN THROUGH THE CONTROL STAT.
NOT REQUIREDUSE CYLINDER SENSOR SUPPLIED
LNS NLSLR
FSFR NP LP
BB421AF
BB421AF
78
9
Pump Control
Code Plug
PumpHarness
FanHarness
S112.5 A 230 V AC
Main Harness
S131.6 A
S120.5 A
DIVERTER VALVEMOTOR PLUG
CYLINDER TEMPERATURESENSOR (SUPPLIED IN DIVERTER KIT)
DUAL THERMOSTAT
Page 38 Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi SystemInternal Diverter Valve, Worcester RF Controls & Unvented Cylinder
There is a unclarity within the Industry that in order to protect an Unvented Hot Water Cylinder from potentiallydangerous high temperatures from the boiler circuit, a 2-port motorised valve must be installed. This is not thecase, although it is the most common interpretation and approach.
FURTHER DETAILSBuilding Regulation Approved Document G3, paragraph 3.6 states '…the non-self-resetting thermal cut outshould be wired to a motorised valve or some other suitable device to shut off the flow to the primary heater…'.The latter part of this sentence can be interpreted to mean as long as we, as responsible Manufacturer's, areconfident our method provides an equal amount of protection to the common approach, we may instructinstallers of our equipment to follow a different approach. A summary is provided below.
l The installer will use the cylinder sensor supplied with the Integral Diverter Valve kit to control the hot water temperature.
l The installer, therefore, will NOT need to use the hot water control thermostat of the cylinder's dual thermostat.
l The installer may have to alter the wiring of the dual thermostat (depending on cylinder and thermostat manufacturer) to only use the high limit thermal cut-out of the dual thermostat.
l The high limit thermal cut out of the dual thermostat MUST be wired to interrupt the permanent live to the Greenstar CDi System Boiler.
l The 2-port valve supplied with the unvented cylinder will NOT be used. If it is already physically installed in the pipe work is should be removed and electrically disconnected from the wiring centre.
Below you will find an electrical diagram for this arrangement.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
78
9
LNS NLSLR FSFR NP LP
ST10 ST19NOTE:Leave link
NOTE:Leave link
SAFETY LIMITTHERMOSTAT
CYLINDERTHERMOSTAT
230V MAINSSUPPLY
N E L
ST6
ST8
Gre
en\Y
ello
w
Connector Block
(made safe)
Bro
wn
Bro
wn
Blu
e
IMPORTANT NOTE:UNDER NO CIRCUMSTANCES SHOULD THE FEED TO THE LIMIT STAT BE TAKEN THROUGH THE CONTROL STAT.
NOT REQUIREDUSE CYLINDER SENSOR SUPPLIED
LNS NLSLR
FSFR NP LP
BB421AF
BB
BB421AF
AF
78
9
Pump Control
Code Plug
PumpHarness
FanHarness
S112.5 A 230 V AC
Main Harness
S131.6 A
S120.5 A
DIVERTER VALVEMOTOR PLUG
FW 100CONTROLLER
OUTSIDESENSOR
CYLINDER TEMPERATURESENSOR (SUPPLIED IN DIVERTER KIT)
DUAL THERMOSTAT
Page 39Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi SystemInternal Diverter Valve, Worcester FX Controls & Unvented Cylinder
There is a unclarity within the Industry that in order to protect an Unvented Hot Water Cylinder from potentiallydangerous high temperatures from the boiler circuit, a 2-port motorised valve must be installed. This is not thecase, although it is the most common interpretation and approach.
FURTHER DETAILSBuilding Regulation Approved Document G3, paragraph 3.6 states '…the non-self-resetting thermal cut outshould be wired to a motorised valve or some other suitable device to shut off the flow to the primary heater…'.The latter part of this sentence can be interpreted to mean as long as we, as responsible Manufacturer's, areconfident our method provides an equal amount of protection to the common approach, we may instructinstallers of our equipment to follow a different approach. A summary is provided below.
l The installer will use the cylinder sensor supplied with the Integral Diverter Valve kit to control the hot water temperature.
l The installer, therefore, will NOT need to use the hot water control thermostat of the cylinder's dual thermostat.
l The installer may have to alter the wiring of the dual thermostat (depending on cylinder and thermostat manufacturer) to only use the high limit thermal cut-out of the dual thermostat.
l The high limit thermal cut out of the dual thermostat MUST be wired to interrupt the permanent live to the Greenstar CDi System Boiler.
l The 2-port valve supplied with the unvented cylinder will NOT be used. If it is already physically installed in the pipe work is should be removed and electrically disconnected from the wiring centre.
Below you will find an electrical diagram for this arrangement.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LRL NSN LS LR
Junction Box/Wiring CentreSwitched Live/
DemandN EL
Double PoleFused Spur
L
EN
C C
C
NO
NC
230V ACDouble Pole Relay
Header LimitThermostat
Wiring from Zone/s Controls
Example relay shown is a Double Pole Mains Voltage Relay. This isolates the Boilers electrically in case of a fault condition.
IMPORTANT NOTE:The Relay should be mounted within a suitable electrically safe housing.
C C
NC NCNO NO
CoilLive
CoilNeutral
Greenstar CDi System
Greenstar CDi System
230V MainsVoltage
Page 40 Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi SystemCascaded boilers with low loss header
HEADER LIMIT THERMOSTATThis cuts the Demand to the boilers in the event of excessive temperature within the Header dueto lack of circulation. Ideally this should be set to 90º C.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstar CDi System
L NSN LS LR
Double PoleFused Spur
L
EN
Neutral Feed to Wiring Centre
Earth to Wiring Centre
Live Feed to Wiring Centre
Switch Live from Wiring Centre
FR FS NP LP
Frost T/Stat
230V MainsVoltage
Page 41Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi SystemFrost Protection
The boiler has inbuilt frost protection. When the primary temperature drops below 8°C the pump is switchedon. When then temperature rises above 9°C the pump switches off after a 3 minute pump overrun. If theprimary temperature drops below 5°C, a central heating demand is activated until the primary temperaturerises above 12 °C. The demand switches off followed by the pump after a 3 minute overrun.
The boiler has the facility to connect an external frost protection device to protect in “at risk areas” (terminalblock ST6, contacts FS and FR). This is used if the boiler is not located in the area needing protection i.e. boilerin kitchen but pipe work in the garage that needs frost protection.
If external frost thermostat is calling, i.e. temperature within frost thermostat below the set point, but theprimary temperature of the boiler is above 5°C, the pump will run until the temperature within the frostthermostat rises above the set point. If external frost thermostat is calling and the primary temperature isbelow 5°C, a central heating demand is activated until primary temperature is above 12 °C. If the frostthermostat is still calling the pump will run until the temperature within the frost thermostat location risesabove the set point.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
Room T/Stat
L
N
Time Controller
HW
ON
CH
ON
M~L
NE
M~L
NE
CylinderZone Valve
HeatingZone Valve
Greenstar CDi Combi
L NSN LS LR
Double PoleFused Spur
L
EN
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 42 Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi Combi2 x 2 Port Valves (S-Plan)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
Double PoleFused Spur
L
EN
CylinderT/Stat
Green/YellowBlueWhiteGreyOrange
EN
Mid PositionValve
L
N
Time Controller
HW
OFF
HW
ON
CH
ON
C
1 2
N
Room T/Stat
L N E 4 5 6 7 8 9 10
Greenstar CDi Combi
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 43Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi CombiMid Position Valve (Y-Plan)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
Double PoleFused Spur
L
EN
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
M~L
NE
HeatingZone 1 Valve
M~L
NE
Room T/StatZone 1
M~L
NE
HeatingZone 2 Valve
N
Room T/StatZone 2
CylinderZone Valve
Greenstar CDi Combi
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
CH
Zon
e 2
ON
L
N
Time Controller3 Channel
HW ON
CH Zone 1 ON
Page 44 Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi combi3 x 2 Port Valves (S-Plan Plus)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Room T/StatZone 1
HeatingZone 1 Valve
L
N
Time Controller
CH
Zon
e 1
ON
CH
Zon
e 2
ON
L NSN LS LR
Double PoleFused Spur
L
EN
N
L N E 4 5 6 7 8 9 10
M~L
NE
M~L
NE
HeatingZone 2 Valve
N
Room T/StatZone 2
Greenstar CDi Combi
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 45Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi combi2 x Heating Zones
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Room T/StatZone 1
HeatingZone 1 ValveL NSN LS LR
Double PoleFused Spur
L
EN
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
M~L
NE
M~L
NE
CylinderZone Valve
Underfloor ControlsWiring Centre
ENL
L N E Demand
L
N
Time ControllerTwin Channel
HW
ON
CH
Zon
e 1
ON
Greenstar CDi Combi
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 46 Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi Combi2 x 2 Port Valves & Underfloor Heating
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Room T/StatRadiators Zone
RadiatorsZone ValveL NSN LS LR
Double PoleFused Spur
L
EN
N
L N E 4 5 6 7 8 9 10
M~L
NE
Underfloor ControlsWiring Centre
ENL
L N E Demand
L
N
Time ControllerSingle Channel
Greenstar CDi Combi
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 47Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi CombiZoned Radiator & Underfloor Heating
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
Double PoleFused Spur
L
EN
Room T/Stat
Time Controller
Series ConnectorNot supplied. Once wired in make connector safe in electrical cover.
Greenstar CDi Combi
230V MainsVoltage
Page 48 Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi Combiseparate Time Controller & Room Thermostat
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
The Link between the Live (L) and Common (C) may already be fitted as
part of the Programmable Thermostat, if not then a link must be fitted.
Double PoleFused Spur
L
EN
Greenstar CDi Combi
ProgrammableThermostat
N L NC NOC
230V MainsVoltage
Page 49Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi CombiProgrammable Thermostat
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
MA
INS
BO
ILERPU
MP
SMARTFIT FROSTPROTECTION
ROOM
PORTACCESSORY
S PLAN
A
CHVALVE
(S)CYLINDERSENSOR
SMARTFITROOM UNIT
POLARITYFREE
3 PORTVALVE
(Y)
HWVALVE
(S)
Y PLAN
UNIT
HW VALVE (S)
CH VALVE (S) CYLINDERT/STAT
N
N
L
Smartfit Layout:Example shown S Plan configurationDouble Pole
Fused Spur
L
EN
L
N
L
SL
PL
Greenstar CDi Combi
230V MainsVoltage
Page 50 Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi CombiSmartfit Control Pack
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LRL NSN LS LR
Junction Box/Wiring CentreSwitched Live/
DemandN EL
Double PoleFused Spur
L
EN
C C
C
NO
NC
230V ACDouble Pole Relay
Header LimitThermostat
Wiring from Zone/s Controls
Example relay shown is a Double Pole Mains Voltage Relay. This isolates the Boilers electrically in case of a fault condition.
IMPORTANT NOTE:The Relay should be mounted within a suitable electrically safe housing.
C C
NC NCNO NO
CoilLive
CoilNeutral
Greenstar CDi Combi
Greenstar CDi Combi
230V MainsVoltage
Page 51Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi CombiCascade boilers with low loss header
NOTEA pump must be wired to each boiler for pump over-run to dissipate heat from within the boiler.The connections are pump live to Lz, pump neutral to Nz and pump earth to the Earth point ofeach boiler.
HEADER LIMIT THERMOSTATThis cuts the Demand to the boilers in the event of excessive temperature within the Header dueto lack of circulation. Ideally this should be set to 90ºC.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstar CDi Combi
L NSN LS LR
Double PoleFused Spur
L
EN
FR FS NP LP
Frost T/Stat
230V MainsVoltage
Page 52 Worcester wiring guide Greenstar gas-fired boilers
Greenstar CDi CombiFrost Protection
The boiler has inbuilt frost protection. When the primary temperature drops below 8°C the pump is switchedon. When then temperature rises above 9°C the pump switches off after a 3 minute pump overrun. If theprimary temperature drops below 5°C, a central heating demand is activated until the primary temperaturerises above 12 °C. The demand switches off followed by the pump after a 3 minute overrun.
The boiler has the facility to connect an external frost protection device to protect in “at risk areas” (terminalblock ST6, contacts FS and FR). This is used if the boiler is not located in the area needing protection i.e. boilerin kitchen but pipe work in the garage that needs frost protection.
If external frost thermostat is calling, i.e. temperature within frost thermostat below the set point, but theprimary temperature of the boiler is above 5°C, the pump will run until the temperature within the frostthermostat rises above the set point. If external frost thermostat is calling and the primary temperature isbelow 5°C, a central heating demand is activated until primary temperature is above 12 °C. If the frostthermostat is still calling the pump will run until the temperature within the frost thermostat location risesabove the set point.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
Room T/Stat
L
N
Time Controller
HW
ON
CH
ON
M~L
NE
M~L
NE
CylinderZone Valve
HeatingZone Valve
L NSN LS LR
LZ NZ
Double PoleFused Spur
L
EN
L
EN
External Pump
Greenstar FS CDi Regular
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 53Worcester wiring guide Greenstar gas-fired boilers
Greenstar FS CDi Regular2 x 2 Port Valves (S Plan)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
LZ NZ
Double PoleFused Spur
L
EN
L
EN
CylinderT/Stat
Green/YellowBlueWhiteGreyOrange
EN
Mid PositionValve
L
N
Time Controller
HW
OFF
HW
ON
CH
ON
C
1 2
N
Room T/Stat
L N E 4 5 6 7 8 9 10
External Pump
Greenstar FS CDi Regular L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 54 Worcester wiring guide Greenstar gas-fired boilers
Greenstar FS CDi RegularMid Position Valve (Y Plan)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
LZ NZ
Greenstar FS CDi Regular
External Pump
Double PoleFused Spur
L
EN
L
EN
CylinderZone Valve
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
M~L
NE
HeatingZone 1 Valve
M~L
NE
Room T/StatZone 1
M~L
NE
HeatingZone 2 Valve
N
Room T/StatZone 2
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
CH
Zon
e 2
ON
L
N
Time Controller3 Channel
HW ON
CH Zone 1 ON
Page 55Worcester wiring guide Greenstar gas-fired boilers
Greenstar FS CDi Regular3 x 2 Port Valves (S Plan Plus)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
LZ NZ
Greenstar FS CDi Regular
Room T/StatZone 1
HeatingZone 1 Valve
L
N
Time Controller
CH
Zon
e 1
ON
CH
Zon
e 2
ON
Double PoleFused Spur
L
EN
L
EN
N
L N E 4 5 6 7 8 9 10
M~L
NE
M~L
NE
HeatingZone 2 Valve
N
Room T/StatZone 2
External Pump
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 56 Worcester wiring guide Greenstar gas-fired boilers
Greenstar FS CDi Regular2 x Heating Zones
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
LZ NZ
Greenstar FS CDi Regular
Room T/StatZone 1
HeatingZone 1 Valve
Double PoleFused Spur
L
EN
L
EN
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
M~L
NE
M~L
NE
CylinderZone Valve
Underfloor ControlsWiring Centre
ENL
L N E Demand
L
N
Time ControllerTwin Channel
HW
ON
CH
Zon
e 1
ON
External Pump
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 57Worcester wiring guide Greenstar gas-fired boilers
Greenstar FS CDi Regular2 x 2 Port Valves & Underfloor Heating
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
LZ NZ
Greenstar FS CDi Regular
Room T/StatRadiators Zone
RadiatorsZone Valve
External Pump
Double PoleFused Spur
L
EN
L
EN
N
L N E 4 5 6 7 8 9 10
M~L
NE
Underfloor ControlsWiring Centre
ENL
L N E Demand
L
N
Time ControllerSingle Channel
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 58 Worcester wiring guide Greenstar gas-fired boilers
Greenstar FS CDi RegularZoned Radiator & Underfloor Heating
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
LZ NZ
Greenstar FS CDi Regular
External Pump
C
1 2
L N E 4 5 6 7 8 9 10
CylinderT/Stat
Double PoleFused Spur
L
EN
L
EN
L
N
Time ControllerSingle Channel
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 59Worcester wiring guide Greenstar gas-fired boilers
Greenstar FS CDi RegularSingle Hot Water Zone (Vented Cylinder)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
LZ NZ
Greenstar FS CDi Regular
External Pump
L N E 4 5 6 7 8 9 10Double PoleFused Spur
L
EN
L
EN
L
N
Time ControllerSingle Channel
N
Room T/Stat
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 60 Worcester wiring guide Greenstar gas-fired boilers
Greenstar FS CDi RegularSingle Heating Zone
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
LZ NZ
Greenstar FS CDi Regular
Double PoleFused Spur
L
EN
N
NN
N
CH onCH onHW on
HW onN
N
L3
4
L
L
L
L
L
L
S/L
NO
NO
NO
N/U = Not Used
BOILER
2.5A Fuse - RS Components stock no 415-604
Warning! 240V - Isolate electrical supplybefore removing wiring centre cover.
HW PUMP
CH PUMP
PROGRAMMER
FROST T/STAT
ROOM T/STAT
CYLINDERT/STAT
FUSE2.5A
Frost T/Stat(if required)
Room T/Stat
HW Pump
CHPump
CH/HWProgrammer
Cylinder T/Stat
UPP 15-50 PUMP PLAN - WIRING CENTRE CONNECTIONS
(N/U)
(N/U)
(N/U)
1
1
1
2
2
2
(N/U)
N
(N/U)(N/U)
(N/U)
N
N
C
C
Demand
Deman
d
Deman
d
C
P/L
N
L
230V MainsVoltage
Page 61Worcester wiring guide Greenstar gas-fired boilers
Greenstar FS CDi RegularGrundfoss Pump Plan
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
IMPORTANT NOTEThe pump over-run of the pump plan controls, causes the hot water pump to run regardless of thehot water cylinder demand, to dissipate boiler heat. Worcester would only recommend theGrundfoss pump plan system on a vented cylinder.
L NSN LS LR
LZ NZ
Greenstar FS CDi Regular
MA
INS
BO
ILERPU
MP
SMARTFIT FROSTPROTECTION
ROOM
PORTACCESSORY
S PLAN
A
CHVALVE
(S)CYLINDERSENSOR
SMARTFITROOM UNIT
POLARITYFREE
3 PORTVALVE
(Y)
HWVALVE
(S)
Y PLAN
UNIT
HW VALVE (S)
CH VALVE (S) CYLINDERT/STAT
External Pump
L
EN
N
N
L
Smartfit Layout:Example shown S Plan configurationDouble Pole
Fused Spur
L
EN
L
N
L
SL
PL
230V MainsVoltage
Page 62 Worcester wiring guide Greenstar gas-fired boilers
Greenstar FS CDi RegularSmartfit Control Pack
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
LZ NZ
Greenstar FS CDi Regular
L NSN LS LR
LZ NZ
Greenstar FS CDi Regular
Shunt Pump
Junction Box/Wiring CentreSwitched Live/
DemandN EL
Double PoleFused Spur
L
EN
L
EN
C C
Shunt Pump
L
EN
C
NO
NC
230V ACDouble Pole Relay
Header LimitThermostat
Wiring from Zone/s Controls
Example relay shown is a Double Pole Mains Voltage Relay. This isolates the Boilers electrically in case of a fault condition.
IMPORTANT NOTE:The Relay should be mounted within a suitable electrically safe housing.
C C
NC NCNO NO
CoilLive
CoilNeutral
230V MainsVoltage
Page 63Worcester wiring guide Greenstar gas-fired boilers
Greenstar FS CDi RegularCascaded boilers with low loss header
NOTEA pump must be wired to each boiler for pump over-run to dissipate heat from within the boiler.The connections are pump live to Lz, pump neutral to Nz and pump earth to the Earth point ofeach boiler.
HEADER LIMIT THERMOSTATThis cuts the Demand to the boilers in the event of excessive temperature within the Header dueto lack of circulation. Ideally this should be set to 90ºC.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
L NSN LS LR
Greenstar FS CDi Regular
Double PoleFused Spur
L
EN Neutral Feed to Wiring Centre
Earth to Wiring Centre
Live Feed to Wiring Centre
Switch Live from Wiring Centre
LZ NZ
L
EN
E
External Pump
FR FS NP LP
Frost Stat
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
Page 64 Worcester wiring guide Greenstar gas-fired boilers
Greenstar FS CDi RegularFrost Protection
The boiler has inbuilt frost protection. When the primary temperature drops below 8°C the pump is switchedon. When then temperature rises above 9°C the pump switches off after a 3 minute pump overrun. If theprimary temperature drops below 5°C, a central heating demand is activated until the primary temperaturerises above 12 °C. The demand switches off followed by the pump after a 3 minute overrun.
The boiler has the facility to connect an external frost protection device to protect in “at risk areas” (terminalblock ST6, contacts FS and FR). This is used if the boiler is not located in the area needing protection i.e. boilerin kitchen but pipe work in the garage that needs frost protection.
If external frost thermostat is calling, i.e. temperature within frost thermostat below the set point, but theprimary temperature of the boiler is above 5°C, the pump will run until the temperature within the frostthermostat rises above the set point. If external frost thermostat is calling and the primary temperature isbelow 5°C, a central heating demand is activated until primary temperature is above 12 °C. If the frostthermostat is still calling the pump will run until the temperature within the frost thermostat location risesabove the set point.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstar HF CDi
L NSN LS LR
NC
Safety isolation
230V HW interface‘Installer Module’
Room T/StatZone 1
HeatingZone 1 Valve
N
L N E 4 5 6 7 8 9 10
M~L
NE
M~L
NE
HeatingZone 2 Valve
N
Room T/StatZone 2
N
Double PoleFused Spur
L
EN
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
CH
Zon
e 2
ON
L
N
Time Controller3 Channel
HW ON
CH
Zon
e 1
ON
Page 65Worcester wiring guide Greenstar gas-fired boilers
Greenstar HF CDi combi2 x Heating Zones
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Room T/StatRadiators Zone
RadiatorsZone Valve
N
L N E 4 5 6 7 8 9 10
M~L
NE
Underfloor ControlsWiring Centre
ENL
L N E Demand
Greenstar HF CDi
L NSN LS LR
NC
Safety isolation
230V HW interface‘Installer Module’
N
Double PoleFused Spur
L
EN
L
N
Time Controller
HW Heat Bank ON
CH
Rad
s O
N
L
N
E
= Live
= Neutral
= EarthE
N
L
ENL
230V MainsVoltage
Page 66 Worcester wiring guide Greenstar gas-fired boilers
Greenstar HF CDi combiZoned Radiator & Underfloor Heating
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Room T/Stat
Series ConnectorNot supplied. Once wired in make connector safe in electrical cover.
Greenstar HF CDi
L NSN LS LR
NC
Safety isolation
230V HW interface‘Installer Module’
N
Time Controller
HW Heat Bank ON
CH
ON
Double PoleFused Spur
L
EN
230V MainsVoltage
Page 67Worcester wiring guide Greenstar gas-fired boilers
Greenstar HF CDi combiseparate Time Controller & Room Thermostat
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstar HF CDi
L NSN LS LR
NC
Safety isolation
230V HW interface‘Installer Module’
N
HW
Hea
t Ban
k O
N
Double PoleFused Spur
L
EN
ProgrammableThermostat
N L NC NOC
Time ControllerHot Water Heat Bank
The Link between the Live (L) and Common (C) may already be fitted as
part of the Programmable Thermostat, if not then a link must be wired in.
230V MainsVoltage
Page 68 Worcester wiring guide Greenstar gas-fired boilers
Greenstar HF CDi combiProgrammable Thermostat
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstar HF CDi
L NSN LS LR
NC
Safety isolation
230V HW interface‘Installer Module’
C
NO
NC
Header LimitThermostat
Room T/Stat
N
Time Controller
HW Heat Bank ON
CH
ON
Double PoleFused Spur
L
EN
SystemPump
L
EN
E
L N E 4 5 6 7 8 9 10
L
N
E
= Live
= Neutral
= EarthE
N
L
E
230V MainsVoltage
Page 69Worcester wiring guide Greenstar gas-fired boilers
Greenstar HF CDi combiLarge heating circuit with low loss header
If the heating system requires a larger pump to circulate the water, then a header can be used toprevent the boiler and system pump from conflicting with each other.
NOTEThe system pump is wired with the heating demand so it will only activate when the heating iscalled for. Size the system pump according to system design specifications and water content.
HEADER LIMIT THERMOSTATThis cuts the Demand to the boiler in the event of excessive temperature within the header due tolack of circulation. Ideally this should be set to 90ºC.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Double PoleFused Spur
L
EN
Greenstar HF CDi
L NSN LS LR
NC
Safety isolation
230V HW interface‘Installer Module’
N
FR FS NP LP
Frost T/Stat
230V MainsVoltage
Page 70 Worcester wiring guide Greenstar gas-fired boilers
Greenstar HF CDi combiFrost Protection
The boiler has inbuilt frost protection. When the primary temperature drops below 8°C the pump is switchedon. When then temperature rises above 9°C the pump switches off after a 3 minute pump overrun. If theprimary temperature drops below 5°C, a central heating demand is activated until the primary temperaturerises above 12 °C. The demand switches off followed by the pump after a 3 minute overrun.
The boiler has the facility to connect an external frost protection device to protect in “at risk areas” (terminalblock ST6, contacts FS and FR). This is used if the boiler is not located in the area needing protection i.e. boilerin kitchen but pipe work in the garage that needs frost protection.
If external frost thermostat is calling, i.e. temperature within frost thermostat below the set point, but theprimary temperature of the boiler is above 5°C, the pump will run until the temperature within the frostthermostat rises above the set point. If external frost thermostat is calling and the primary temperature isbelow 5°C, a central heating demand is activated until primary temperature is above 12 °C. If the frostthermostat is still calling the pump will run until the temperature within the frost thermostat location risesabove the set point.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
GreenstarSi Combi
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
Room T/Stat
L
N
Time Controller
HW
ON
CH
ON
M~L
NE
M~L
NE
CylinderZone Valve
HeatingZone ValveL NSN LS LR
Double PoleFused Spur
L
EN
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
Page 71Worcester wiring guide Greenstar gas-fired boilers
Greenstar Si Combi2 x 2 Port Valves (S Plan)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
GreenstarSi Combi
L NSN LS LR
Double PoleFused Spur
L
EN
CylinderT/Stat
Green/YellowBlueWhiteGreyOrange
EN
Mid PositionValve
L
N
Time Controller
HW
OFF
HW
ON
CH
ON
C
1 2
N
Room T/Stat
L N E 4 5 6 7 8 9 10
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
Page 72 Worcester wiring guide Greenstar gas-fired boilers
Greenstar Si CombiMid Position Valve (Y Plan)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
GreenstarSi Combi
L NSN LS LR
Double PoleFused Spur
L
EN
CylinderZone Valve
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
M~L
NE
HeatingZone 1 Valve
M~L
NE
Room T/StatZone 1
M~L
NE
HeatingZone 2 Valve
N
Room T/StatZone 2
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
CH
Zon
e 2
ON
L
N
Time Controller3 Channel
HW ON
CH Zone 1 ON
Page 73Worcester wiring guide Greenstar gas-fired boilers
Greenstar Si Combi3 x 2 Port Valves (S Plan Plus)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
GreenstarSi Combi Room T/Stat
Zone 1
HeatingZone 1 Valve
L
N
Time Controller
CH
Zon
e 1
ON
CH
Zon
e 2
ON
L NSN LS LR
Double PoleFused Spur
L
EN
N
L N E 4 5 6 7 8 9 10
M~L
NE
M~L
NE
HeatingZone 2 Valve
N
Room T/StatZone 2
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
Page 74 Worcester wiring guide Greenstar gas-fired boilers
Greenstar Si Combi2 x Heating Zones
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
GreenstarSi Combi
Room T/StatZone 1
HeatingZone 1 ValveL NSN LS LR
Double PoleFused Spur
L
EN
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
M~L
NE
M~L
NE
CylinderZone Valve
Underfloor ControlsWiring Centre
ENL
L N E Demand
L
N
Time ControllerTwin Channel
HW
ON
CH
Zon
e 1
ON
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
Page 75Worcester wiring guide Greenstar gas-fired boilers
Greenstar Si Combi2 x 2 Port Valves & Underfloor Heating
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
GreenstarSi Combi Room T/Stat
Radiators Zone
RadiatorsZone ValveL NSN LS LR
Double PoleFused Spur
L
EN
N
L N E 4 5 6 7 8 9 10
M~L
NE
Underfloor ControlsWiring Centre
ENL
L N E Demand
L
N
Time ControllerSingle Channel
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
CH
ON
Page 76 Worcester wiring guide Greenstar gas-fired boilers
Greenstar Si CombiZoned Radiator & Underfloor Heating
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
GreenstarSi Combi
L NSN LS LR
Double PoleFused Spur
L
EN
Room T/Stat
Time Controller
Series ConnectorNot supplied. Once wired in, make connector safe in electrical cover.
230V MainsVoltage
CH
ON
Page 77Worcester wiring guide Greenstar gas-fired boilers
Greenstar Si Combiseparate Time Controller & Room Thermostat
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
GreenstarSi Combi
L NSN LS LR
Double PoleFused Spur
L
EN
ProgrammableThermostat
N L NC NOC
The Link between the Live (L) and Common (C) may already be fitted as
part of the Programmable Thermostat, if not then a link must be wired in.
230V MainsVoltage
Page 78 Worcester wiring guide Greenstar gas-fired boilers
Greenstar Si CombiProgrammable Thermostat
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
GreenstarSi Combi
L NSN LS LR
MA
INS
BO
ILERPU
MP
SMARTFIT FROSTPROTECTION
ROOM
PORTACCESSORY
S PLAN
A
CHVALVE
(S)CYLINDERSENSOR
SMARTFITROOM UNIT
POLARITYFREE
3 PORTVALVE
(Y)
HWVALVE
(S)
Y PLAN
UNIT
HW VALVE (S)
CH VALVE (S) CYLINDERT/STAT
N
N
L
Smartfit Layout:Example shown S Plan configurationDouble Pole
Fused Spur
L
EN
L
N
L
SL
PL
230V MainsVoltage
Page 79Worcester wiring guide Greenstar gas-fired boilers
Greenstar Si CombiSmartfit Control Pack
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
GreenstarSi Combi
GreenstarSi Combi
L NSN LS LRL NSN LS LR
Junction Box/Wiring CentreSwitched Live/
DemandN EL
Double PoleFused Spur
L
EN
C C
C
NO
NC
230V ACDouble Pole Relay
Header LimitThermostat
Wiring from Zone/s Controls
Example relay shown is a Double Pole Mains Voltage Relay. This isolates the Boilers electrically in case of a fault condition.
IMPORTANT NOTE:The Relay should be mounted within a suitable electrically safe housing.
C C
NC NCNO NO
CoilLive
CoilNeutral
230V MainsVoltage
Page 80 Worcester wiring guide Greenstar gas-fired boilers
Greenstar Si CombiCascaded boilers with low loss header
HEADER LIMIT THERMOSTATThis cuts the Demand to the boilers in the event of excessive temperature within the Headerdue to lack of circulation. Ideally this should be set to 90º C.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
GreenstarSi Combi
L NSN LS LR
Double PoleFused Spur
L
EN
FR FS NP LP
Frost T/Stat
230V MainsVoltage
Page 81Worcester wiring guide Greenstar gas-fired boilers
Greenstar Si CombiFrost Protection
The boiler has inbuilt frost protection. When the primary temperature drops below 8°C the pump is switchedon. When then temperature rises above 9°C the pump switches off after a 3 minute pump overrun. If theprimary temperature drops below 5°C, a central heating demand is activated until the primary temperaturerises above 12 °C. The demand switches off followed by the pump after a 3 minute overrun.
The boiler has the facility to connect an external frost protection device to protect in “at risk areas” (terminalblock ST6, contacts FS and FR). This is used if the boiler is not located in the area needing protection i.e. boilerin kitchen but pipe work in the garage that needs frost protection.
If external frost thermostat is calling, i.e. temperature within frost thermostat below the set point, but theprimary temperature of the boiler is above 5°C, the pump will run until the temperature within the frostthermostat rises above the set point. If external frost thermostat is calling and the primary temperature isbelow 5°C, a central heating demand is activated until primary temperature is above 12 °C. If the frostthermostat is still calling the pump will run until the temperature within the frost thermostat location risesabove the set point.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari Jnr Combi
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
Room T/Stat
L
N
Time Controller
HW
ON
CH
ON
M~L
NE
M~L
NE
CylinderZone Valve
HeatingZone ValveL NSN LS LR
Double PoleFused Spur
L
EN
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
Page 82 Worcester wiring guide Greenstar gas-fired boilers
Greenstar i Junior Combi2 x 2 Port Valves (S Plan)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari Jnr Combi
L NSN LS LR
Double PoleFused Spur
L
EN
CylinderT/Stat
Green/YellowBlueWhiteGreyOrange
EN
Mid PositionValve
L
N
Time Controller
HW
OFF
HW
ON
CH
ON
C
1 2
N
Room T/Stat
L N E 4 5 6 7 8 9 10
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
Page 83Worcester wiring guide Greenstar gas-fired boilers
Greenstar i Junior CombiMid Position Valve (Y Plan)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari Jnr Combi
L NSN LS LR
Double PoleFused Spur
L
EN
CylinderZone Valve
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
M~L
NE
HeatingZone 1 Valve
M~L
NE
Room T/StatZone 1
M~L
NE
HeatingZone 2 Valve
N
Room T/StatZone 2
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
CH
Zon
e 2
ON
L
N
Time Controller3 Channel
HW ON
CH Zone 1 ON
Page 84 Worcester wiring guide Greenstar gas-fired boilers
Greenstar i Junior Combi3 x 2 Port Valves (S Plan Plus)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari Jnr Combi Room T/Stat
Zone 1
HeatingZone 1 Valve
L
N
Time Controller
CH
Zon
e 1
ON
CH
Zon
e 2
ON
L NSN LS LR
Double PoleFused Spur
L
EN
N
L N E 4 5 6 7 8 9 10
M~L
NE
M~L
NE
HeatingZone 2 Valve
N
Room T/StatZone 2
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
Page 85Worcester wiring guide Greenstar gas-fired boilers
Greenstar i Junior Combi2 x Heating Zones
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari Jnr Combi
Room T/StatZone 1
HeatingZone 1 ValveL NSN LS LR
Double PoleFused Spur
L
EN
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
M~L
NE
M~L
NE
CylinderZone Valve
Underfloor ControlsWiring Centre
ENL
L N E Demand
L
N
Time ControllerTwin Channel
HW
ON
CH
Zon
e 1
ON
ENL
L
N
E
= Live
= Neurtal
= EarthE
N
L
230V MainsVoltage
Page 86 Worcester wiring guide Greenstar gas-fired boilers
Greenstar i Junior Combi2 x 2 Port Valves & Underfloor Heating
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari Jnr Combi Room T/Stat
Radiators Zone
RadiatorsZone ValveL NSN LS LR
Double PoleFused Spur
L
EN
N
L N E 4 5 6 7 8 9 10
M~L
NE
Underfloor ControlsWiring Centre
ENL
L N E Demand
L
N
Time ControllerSingle Channel
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
CH
ON
Page 87Worcester wiring guide Greenstar gas-fired boilers
Greenstar i Junior CombiZoned Radiator & Underfloor Heating
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari Jnr Combi
L NSN LS LR
Double PoleFused Spur
L
EN
Room T/Stat
Time Controller
Series ConnectorNot supplied. Once wired in, make connector safe in electrical cover.
230V MainsVoltage
CH
ON
Page 88 Worcester wiring guide Greenstar gas-fired boilers
Greenstar i Junior Combiseparate Time Controller & Room Thermostat
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari Jnr Combi
L NSN LS LR
Double PoleFused Spur
L
EN
ProgrammableThermostat
N L NC NOC
The Link between the Live (L) and Common (C) may already be fitted as
part of the Programmable Thermostat, if not then a link must be wired in.
230V MainsVoltage
Page 89Worcester wiring guide Greenstar gas-fired boilers
Greenstar i Junior CombiProgrammable Thermostat
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari Jnr Combi
L NSN LS LR
MA
INS
BO
ILERPU
MP
SMARTFIT FROSTPROTECTION
ROOM
PORTACCESSORY
S PLAN
A
CHVALVE
(S)CYLINDERSENSOR
SMARTFITROOM UNIT
POLARITYFREE
3 PORTVALVE
(Y)
HWVALVE
(S)
Y PLAN
UNIT
HW VALVE (S)
CH VALVE (S) CYLINDERT/STAT
N
N
L
Smartfit Layout:Example shown S Plan configurationDouble Pole
Fused Spur
L
EN
L
N
L
SL
PL
230V MainsVoltage
Page 90 Worcester wiring guide Greenstar gas-fired boilers
Greenstar i Junior combiSmartfit Control Pack
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari Jnr Combi
Greenstari jnr Combi
L NSN LS LRL NSN LS LR
Junction Box/Wiring CentreSwitched Live/
DemandN EL
Double PoleFused Spur
L
EN
C C
C
NO
NC
230V ACDouble Pole Relay
Header LimitThermostat
Wiring from Zone/s Controls
Example relay shown is a Double Pole Mains Voltage Relay. This isolates the Boilers electrically in case of a fault condition.
IMPORTANT NOTE:The Relay should be mounted within a suitable electrically safe housing.
C C
NC NCNO NO
CoilLive
CoilNeutral
230V MainsVoltage
Page 91Worcester wiring guide Greenstar gas-fired boilers
Greenstar i Junior combiCascade boilers with low loss header
HEADER LIMIT THERMOSTATThis cuts the Demand to the boilers in the event of excessive temperature within the Header dueto lack of circulation. Ideally this should be set to 90º C.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari Jnr Combi
L NSN LS LR
Double PoleFused Spur
L
EN
FR FS NP LP
Frost T/Stat
230V MainsVoltage
Page 92 Worcester wiring guide Greenstar gas-fired boilers
Greenstar i Junior combiFrost Protection
The boiler has inbuilt frost protection. When the primary temperature drops below 8°C the pump is switchedon. When then temperature rises above 9°C the pump switches off after a 3 minute pump overrun. If theprimary temperature drops below 5°C, a central heating demand is activated until the primary temperaturerises above 12 °C. The demand switches off followed by the pump after a 3 minute overrun.
The boiler has the facility to connect an external frost protection device to protect in “at risk areas” (terminalblock ST6, contacts FS and FR). This is used if the boiler is not located in the area needing protection i.e. boilerin kitchen but pipe work in the garage that needs frost protection.
If external frost thermostat is calling, i.e. temperature within frost thermostat below the set point, but theprimary temperature of the boiler is above 5°C, the pump will run until the temperature within the frostthermostat rises above the set point. If external frost thermostat is calling and the primary temperature isbelow 5°C, a central heating demand is activated until primary temperature is above 12 °C. If the frostthermostat is still calling the pump will run until the temperature within the frost thermostat location risesabove the set point.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari System
L NSN LS LR C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
Room T/Stat
L
N
Time Controller
HW
ON
CH
ON
M~L
NE
M~L
NE
CylinderZone Valve
HeatingZone Valve
Double PoleFused Spur
L
EN
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
Page 93Worcester wiring guide Greenstar gas-fired boilers
Greenstar i System2 x 2 Port Valves (S Plan)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari System
L NSN LS LR
Double PoleFused Spur
L
EN
CylinderT/Stat
Green/YellowBlueWhiteGreyOrange
EN
Mid PositionValve
L
N
Time Controller
HW
OFF
HW
ON
CH
ON
C
1 2
N
Room T/Stat
L N E 4 5 6 7 8 9 10
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
Page 94 Worcester wiring guide Greenstar gas-fired boilers
Greenstar i SystemMid Position Valve (Y Plan)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari System
L NSN LS LR
Double PoleFused Spur
L
EN
CylinderZone Valve
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
M~L
NE
HeatingZone 1 Valve
M~L
NE
Room T/StatZone 1
M~L
NE
HeatingZone 2 Valve
N
Room T/StatZone 2
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
CH
Zon
e 2
ON
L
N
Time Controller3 Channel
HW ON
CH Zone 1 ON
Page 95Worcester wiring guide Greenstar gas-fired boilers
Greenstar i System3 x 2 Port Valves (S Plan Plus)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari System
L NSN LS LR
Room T/StatZone 1
HeatingZone 1 Valve
L
N
Time Controller
CH
Zon
e 1
ON
CH
Zon
e 2
ON
Double PoleFused Spur
L
EN
N
L N E 4 5 6 7 8 9 10
M~L
NE
M~L
NE
HeatingZone 2 Valve
N
Room T/StatZone 2
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
Page 96 Worcester wiring guide Greenstar gas-fired boilers
Greenstar i System2 x Heating Zones
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari System
L NSN LS LR
Room T/StatZone 1
HeatingZone 1 Valve
Double PoleFused Spur
L
EN
C
1 2
N
L N E 4 5 6 7 8 9 10
CylinderT/Stat
M~L
NE
M~L
NE
CylinderZone Valve
Underfloor ControlsWiring Centre
ENL
L N E Demand
L
N
Time ControllerTwin Channel
HW
ON
CH
Zon
e 1
ON
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
Page 97Worcester wiring guide Greenstar gas-fired boilers
Greenstar i System2 x 2 Port Valves & Underfloor Heating
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari System
L NSN LS LR
Room T/StatRadiators Zone
RadiatorsZone Valve
Double PoleFused Spur
L
EN
N
L N E 4 5 6 7 8 9 10
M~L
NE
Underfloor ControlsWiring Centre
ENL
L N E Demand
L
NE
= Live
= Neurtal= Earth
L
N
Time ControllerSingle Channel
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
CH
ON
Page 98 Worcester wiring guide Greenstar gas-fired boilers
Greenstar i SystemZoned Radiator & Underfloor Heating
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari System
L NSN LS LR
C
1 2
L N E 4 5 6 7 8 9 10
CylinderT/Stat
Double PoleFused Spur
L
EN
L
N
Time ControllerSingle Channel
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
Page 99Worcester wiring guide Greenstar gas-fired boilers
Greenstar i SystemSingle Hot Water Zone (Vented Cylinder)
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari System
L NSN LS LR
L N E 4 5 6 7 8 9 10Double PoleFused Spur
L
EN
L
N
Time ControllerSingle Channel
N
Room T/Stat
ENL
L
N
E
= Live
= Neutral
= EarthE
N
L
230V MainsVoltage
Page 100 Worcester wiring guide Greenstar gas-fired boilers
Greenstar i SystemSingle Heating Zone
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari System
L NSN LS LR
MA
INS
BO
ILERPU
MP
SMARTFIT FROSTPROTECTION
ROOM
PORTACCESSORY
S PLAN
A
CHVALVE
(S)CYLINDERSENSOR
SMARTFITROOM UNIT
POLARITYFREE
3 PORTVALVE
(Y)
HWVALVE
(S)
Y PLAN
UNIT
HW VALVE (S)
CH VALVE (S) CYLINDERT/STAT
N
N
L
Smartfit Layout:Example shown S Plan configurationDouble Pole
Fused Spur
L
EN
L
N
L
SL
PL
230V MainsVoltage
Page 101Worcester wiring guide Greenstar gas-fired boilers
Greenstar i SystemSmartfit Control Pack
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Optional:Third Party Room Thermostat:
Using the Worcester Internal DT20 Timer an External Third Party Room Thermostat must be connected to the boiler on the External Controls section of ST10 (NS, LS & LR).
LNS NLSLR
FSFR NP LP
78
9
LNS NLSLR 78
9
FSFR NP LP
ST10NOTE:
Leave the link if using Worcester Internal Digital RF units.
SAFETY LIMITTHERMOSTAT
DUAL THERMOSTAT
OPTIONAL:THIRD PARTY
ROOM THERMOSTAT
CYLINDERTHERMOSTAT
DIVERTER VALVEMOTOR PLUG
230V MAINSSUPPLY
N E L
ST6
ST8
Gre
en\Y
ello
w
Connector Block
(made safe)
Bro
wn
Bro
wn
Main Harness
Code Plug
PumpHarness
FanHarness
S112.5 A 230 V AC
S131.6 A
Blu
e
N
CALL COM
S120.5 A
Page 102 Worcester wiring guide Greenstar gas-fired boilers
Greenstar i SystemInternal Diverter Valve with Worcester Controls & Unvented Cylinder
There is a unclarity within the Industry that in order to protect an Unvented Hot Water Cylinder from potentiallydangerous high temperatures from the boiler circuit, a 2-port motorised valve must be installed. This is not thecase, although it is the most common interpretation and approach.
FURTHER DETAILSBuilding Regulation Approved Document G3, paragraph 3.6 states '…the non-self-resetting thermal cut outshould be wired to a motorised valve or some other suitable device to shut off the flow to the primary heater…'.The latter part of this sentence can be interpreted to mean as long as we, as responsible Manufacturer's, areconfident our method provides an equal amount of protection to the common approach, we may instructinstallers of our equipment to follow a different approach. A summary is provided below.
l The installer will use the cylinder sensor supplied with the Integral Diverter Valve kit to control the hot water temperature.
l The installer, therefore, will NOT need to use the hot water control thermostat of the cylinder's dual thermostat.
l The installer may have to alter the wiring of the dual thermostat (depending on cylinder and thermostat manufacturer) to only use the high limit thermal cut-out of the dual thermostat.
l The high limit thermal cut out of the dual thermostat MUST be wired to interrupt the permanent live to the Greenstar CDi System Boiler.
l The 2-port valve supplied with the unvented cylinder will NOT be used. If it is already physically installed in the pipe work is should be removed and electrically disconnected from the wiring centre.
Below you will find an electrical diagram for this arrangement.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari System
Greenstari System
L NSN LS LRL NSN LS LR
Junction Box/Wiring CentreSwitched Live/
DemandN EL
Double PoleFused Spur
L
EN
C C
C
NO
NC
230V ACDouble Pole Relay
Header LimitThermostat
Wiring from Zone/s Controls
Example relay shown is a Double Pole Mains Voltage Relay. This isolates the Boilers electrically in case of a fault condition.
IMPORTANT NOTE:The Relay should be mounted within a suitable electrically safe housing.
C C
NC NCNO NO
CoilLive
CoilNeutral
230V MainsVoltage
Page 103Worcester wiring guide Greenstar gas-fired boilers
Greenstar i SystemCascade boilers with low loss header
HEADER LIMIT THERMOSTATThis cuts the Demand to the boilers in the event of excessive temperature within the Header dueto lack of circulation. Ideally this should be set to 90º C.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Greenstari System
L NSN LS LR
Double PoleFused Spur
L
EN
Neutral Feed to Wiring Centre
Earth to Wiring Centre
Live Feed to Wiring Centre
Switch Live from Wiring Centre
FR FS NP LP
Frost T/Stat
230V MainsVoltage
Page 104 Worcester wiring guide Greenstar gas-fired boilers
Greenstar i SystemFrost Protection
The boiler has inbuilt frost protection. When the primary temperature drops below 8°C the pump is switchedon. When then temperature rises above 9°C the pump switches off after a 3 minute pump overrun. If theprimary temperature drops below 5°C, a central heating demand is activated until the primary temperaturerises above 12 °C. The demand switches off followed by the pump after a 3 minute overrun.
The boiler has the facility to connect an external frost protection device to protect in “at risk areas” (terminalblock ST6, contacts FS and FR). This is used if the boiler is not located in the area needing protection i.e. boilerin kitchen but pipe work in the garage that needs frost protection.
If external frost thermostat is calling, i.e. temperature within frost thermostat below the set point, but theprimary temperature of the boiler is above 5°C, the pump will run until the temperature within the frostthermostat rises above the set point. If external frost thermostat is calling and the primary temperature isbelow 5°C, a central heating demand is activated until primary temperature is above 12 °C. If the frostthermostat is still calling the pump will run until the temperature within the frost thermostat location risesabove the set point.
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Page 105Worcester wiring guide Greenstar gas-fired boilers
Page 106Worcester wiring guide Greenstar gas-fired boilers
L = LiveL N = NeutralN E = EarthE
The generic Live, Neutral and Earth feed/s to equipment must return to the respective connection on the wiring centre.These connections are denoted as follows:
Worcester, Bosch Group, Cotswold Way,Warndon, Worcester, WR4 9SW.Tel: 0844 892 9900
Worcester, Bosch Group is a brand name of Bosch Thermotechnology Ltd.
This is leaflet is accurate at the date of printing, buy may be superseded and shouldbe disregarded if specification and/or appearances are changed in the interest ofcontinued improvement. The statutory rights of the consumer are not affected.
6 720 646 965 Issue A (09/11)
SalesTel: 01905 [email protected]
Spare PartsTel: 01905 [email protected]
TrainingTel: 01905 [email protected]
LiteratureTel: 0844 892 [email protected]
or download instantly from our website
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Contact CentreTel: 0844 892 [email protected]
Monday – Friday 7.00am – 8.00pm
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Sunday 9.00am – 12 noon
Technical SupportTel: 0844 892 [email protected]
Monday – Friday 7.00am – 8.00pm
Saturday 8.30am – 4.00pm
Useful Numbers
Calls to the listed 0844 numbers are charged at up to 3 pence per minute from BT landlines.Calls from mobiles and some networks may vary. Calls to and from Bosch Thermotechnology Ltd.may be recorded for training and quality assurance purposes.
www.worcester-bosch.co.uk