Benchmark 27i System Compact Installation, Commissioning And Servicing Instructions page 33

EXTERNAL 230V PROGRAMMER AND TWO HEAT ZONES WITH UNVENTED CYLINDER (S-PLAN PLUS)
SYSTEM BOILER CONNECTIONS
EMS
PRE WIRED LINK
Fig. 46 External controls with unvented cylinder
All of these points are wired to
L
All of these points are wired to
N
All of these points are wired to
E
Table 25 Connection legend
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.
Greenstar i System Compact ErP - 6 720 813 280 (2015/07)
230V 230V
FR FS LR LR
OUT IN
N L N L N L N L N L
Room T/Stat
Zone 1
N
L N E
L N E
N
L
Programmer
this point
L
this point
N
this point
E
230V Mains Voltage
Double Pole Fused Spur
N
Dual
E
Thermostat
C
Zone 1 Valve
4
5 6 7 8 9 10
M
~
N
E
Cylinder
Zone Valve
N
N
Room T/Stat
Zone 2
SYSTEM WIRING CENTRE
External components are connected to the Wiring centre junction box.
Remove any links from the boiler terminal block.
Wiring Centre/Junction Box
L N E
FR FS LR LR
Fig. 47
INSTALLATION
L
N
E
M
~
L
Heating
L
M
~
E
L
Heating
Zone 2 Valve
6720646609-48.1Wo
SW
230V
MAINS
SUPPLY
E L N
230V 230V
OUT IN
N L N L N L N L N L
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