6
Typical Gravity DHW
with pumped central heating
DHW = Domestic
Hot Water
W
iring
Typical fully pumped system
with spring return zone valve in heating
Given below are typical wiring diagrams for various types
of systems.
Note: Whilst every attempt has been made to ensure the accuracy of this
information it is recommended that the speci
fi
c information relating to the
ancillary controls is obtained from the manufacturers concerned.
N
L
1
2
3
4
5
6
3 amp fuse
D.H.W.
HTG
ON
OFF
Mains
Supply N
L
Programmer
Terminals
L
N
N
N
Boiler
Pump
Room
Stat
ON
OFF
N
L
1
2
3
4
5
6
3 amp fuse
D.H.W.
HTG
ON
OFF
Mains
Supply N
L
Programmer
Terminals
L
N
N
N
Boiler &
Pump
HTG
valve
Room
Stat
Cyl.
Stat
ON
OFF
