Worcester 27i System Compact User Manual

INSTALLATION
Greenstar i System Compact - 6 720 807 726 (2013/05)30
EXTERNAL 230V PROGRAMMER AND TWO HEAT ZONES WITH UNVENTED CYLINDER (S-PLAN PLUS)
Fig. 53 External controls with unvented cylinder
EXISTING INSTALLATIONS
For boiler replacements on an existing system, it is not necessary to zone
the upstairs and downstairs separately, compliance with the zone
requirements can be achieved by a single room thermostat or
programmable room thermostat.
While the system is drained down, a TRV must be fitted to all radiators
except in bathrooms and the room with the thermostat.
SYSTEM WIRING CENTRE
External components are connected to the Wiring centre junction box.
Fig. 54
All of these points are wired to this point
All of these points are wired to this point
All of these points are wired to this point
Table 11 Connection legend
L
E
N
230V Mains Voltage
Double Pole Fused Spur
6720646609-48.1Wo
C
Dual
Thermostat
N
N
M
~
L
N
E
M
~
L
N
E
E
N
L
LNE4
56
78
910
Heating
Zone 1 Valve
Cylinder
Zone Valve
M
~
L
N
E
Heating
Zone 2 Valve
Room T/Stat
Zone 2
Room T/Stat
Zone 1
230V
IN
230V
OUT
FR FS
LR
LR
LN
L
N
LN
LN
LN
SYSTEM BOILER CONNECTIONS
PRE WIRED LINK
CH ON
HW ON
L
N
Programmer
EMS
L
L
N
N
E
E
Remove any links from the boiler terminal block.
230V
MAINS
SUPPLY
NEL
230V
IN
230V
OUT
FR FS
LR
LR
LN
L
N
LN
LN
LN
6720646609-16.1Wo
NE SWL
Wiring Centre/Junction Box

Worcester 27i System Compact Specifications

General

Brand	Worcester
Model	27i System Compact
Category	Boiler
Language	English