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Typical wiring diagrams
Example circuit diagrams for some typical installations are shown below. These diagrams are
schematic and should be used as a guide only.
Please ensure that all installations comply with the current IEE regulations.
For reasons of space and clarity not every system has been included and the diagrams have been
simplified (for example some earth connections have been omitted)
Other control components shown in the diagrams i.e. valves, room stats etc are general
representations only. However the wiring detail can be applied to the corresponding models of most
manufacturers, e.g. Horstmann, Honeywell, Danfoss Randall, ACL Drayton etc.
Cylinder and Room Thermostat Key:
C = Common CALL = Call for heat or break on rise SAT = Satisfied on rise N = Neutral
N
L
1
E
MAINS
N
L
1
N
SUPPLY
L
FOR PRECISE TERMINAL
N
L
1
E
CONNECTION INFORMATION
PLEASE REFER TO BOILER
MAINS
N
MANUFACTURER INSTRUCTIONS
SUPPLY
L
E
E
N
L
FOR PRECISE TERMINAL
MAINS
N
CONNECTION INFORMATION
SUPPLY
PLEASE REFER TO BOILER
COMBINATION BOILER TERMINALS
MANUFACTURER INSTRUCTIONS
L
FOR PRECISE TERMINAL
CONNECTION INFORMATION
E
N
L
425 Coronet controlling typical combination boiler
PLEASE REFER TO BOILER
MANUFACTURER INSTRUCTIONS
COMBINATION BOILER TERMINALS
installation via room thermostat.
E
N
L
425 Coronet controlling typical combination boiler
COMBINATION BOILER TERMINALS
installation via room thermostat.
N
L
1
425 Coronet controlling typical combination boiler
E
installation via room thermostat.
MAINS
N
N
L
SUPPLY
L
E
MAINS
N
N
L
SUPPLY
L
E
N
L
MAINS
BOILER
N
SUPPLY
L
N
L
BOILER
425 Diadem/Tiara controlling gravity hot water with
pumped heating via room stat and cylinder stat.
N
L
425 Diadem/Tiara controlling gravity hot water with
BOILER
pumped heating via room stat
425 Diadem/Tiara controlling gravity hot water with
pumped heating via room stat
L
N
1
N
L
1
E
MAINS
N
E
SUPPLY
C
MAINS
N
N
L
1
L
SUPPLY
L
E
MAINS
N
CALL
SUPPLY
CALL
L
CALL
N
L
N
L
PUMP &
PUMP &
BOILER
BOILER
425 Tiara controlling fully pumped system using two
425 Tiara controlling fully pumped system using two
N
L
motorised 2 port valves with auxiliary switches via
PUMP &
motorised 2 port valves with auxiliary switches via
BOILER
room stat and cylinder stat.
room stat and cylinder stat.
425 Tiara controlling fully pumped system using two
motorised 2 port valves with auxiliary switches via
room stat and cylinder stat.
4
2
3
4
5
6
TERMINALS L - 5
SHOULD NOT
N
C
BE LINKED
ROOM
2
3
4
5
6
STAT
TERMINALS L - 5
SHOULD NOT
CALL
SAT
N
C
BE LINKED
2
3
4
5
6
REMOVE
ROOM
TERMINALS L - 5
LINK IF
STAT
SHOULD NOT
FITTED
N
C
BE LINKED
CALL
SAT
ROOM
STAT
REMOVE
LINK IF
FITTED
CALL
SAT
REMOVE
LINK IF
FITTED
2
3
4
5
6
N
C
1
2
3
4
5
6
ROOM
STAT
SAT
CALL
N
C
1
2
3
4
5
6
ROOM
STAT
N
L
MAINS
CALL
SAT
PUMP
N
C
SUPPLY
ROOM
N
L
STAT
PUMP
CALL
SAT
N
L
PUMP
5
6
2
3
4
2
3
4
5
6
N
C
MAINS
2
4
5
6
3
CYL
SUPPLY
C
N
C
ROOM
STAT
STAT
CYL
ROOM
STAT
STAT
MAINS
SAT
CALL
SAT
SUPPLY
C
N
C
SAT
CALL
SAT
CYL
ROOM
STAT
STAT
SAT
CALL
SAT
ZONE
ZONE
VALVE
VALVE
ZONE
ZONE
VALVE
VALVE
ZONE
ZONE
VALVE
VALVE
N
L
1
2
E
MAINS
N
SUPPLY
L
N
L
1
2
3
C
E
MAINS
CYL
N
N
L
1
2
3
STAT
SUPPLY
L
E
CALL
SAT
CALL
MAINS
N
C
N
SUPPLY
CYL
L
N
L
STAT
N
BOILER
PUMP
N
C
CALL
SAT
CALL
CYL
STAT
425 Coronet controlling gravity hot water with
N
L
N
L
BOILER
PUMP
pumped heating via room stat and cylinder stat.
CALL
SAT
CALL
N
L
N
L
425 Coronet controlling gravity hot water with
BOILER
PUMP
pumped heating via room stat and cylinder stat.
N
L
1
2
3
425 Coronet controlling gravity hot water with
E
pumped heating via room stat and cylinder stat.
MAINS
N
N
L
1
2
3
4
SUPPLY
L
E
MAINS
N
C
N
N
L
1
2
3
4
SUPPLY
CYL
L
STAT
E
C
N
N
C
CALL
SAT
CALL
CYL
STAT
L
C
N
C
N
L
N
CALL
SAT
CALL
SAT
CYL
BOILER
PUMP
STAT
N
L
N
L
CALL
SAT
CALL
SAT
BOILER
PUMP
425 Diadem/Tiara controlling gravity hot water with
N
N
L
L
BOILER
PUMP
pumped heating via room stat and cylinder stat.
425 Diadem/Tiara controlling gravity hot water with
pumped heating via room stat and cylinder stat.
425 Diadem/Tiara controlling gravity hot water with
pumped heating via room stat and cylinder stat.
L
N
1
2
3
N
L
1
2
3
4
E
MAINS
N
E
N
SUPPLY
N
N
L
1
2
N
4
C
L
3
C
CYL
L
E
C
STAT
CYL
N
STAT
N
C
CALL
CALL
SAT
L
C
CALL
SAT
CYL
STAT
CALL
ZONE
CALL
SAT
VALVE
ZONE
VALVE
N
L
ZONE
N
L
VALVE
PUMP &
PUMP &
BOILER
BOILER
Fully pumped system using roomstat and two (2 port)
425 Tiara controlling fully pumped system using room
N
L
spring return zone valve with auxiliary switches.
PUMP &
stat and two (2 port) spring return zone valve with
BOILER
auxiliary switches
425 Tiara controlling fully pumped system using room
stat and two (2 port) spring return zone valve with
auxiliary switches
3
4
5
6
E
MAINS
N
SUPPLY
L
4
5
6
N
N
C
E
MAINS
ROOM
N
4
5
6
N
STAT
SUPPLY
L
E
SAT
C
MAINS
N
SUPPLY
ROOM
L
L
STAT
C
SAT
ROOM
STAT
425 Coronet controlling fully pumped system via room
N
PUMP &
stat,cylinder stat and using a 2 port spring return valve
SAT
BOILER
with auxiliary switch on heating circuit.
N
425 Coronet controlling fully pumped system via room
PUMP &
BOILER
stat,cylinder stat and using a 2 port spring return valve
4
5
6
with auxiliary switch on heating circuit.
425 Coronet controlling fully pumped system via room
E
stat,cylinder stat and using a 2 port spring return valve
MAINS
N
with auxiliary switch on heating circuit.
5
6
N
SUPPLY
L
E
MAINS
N
C
5
6
N
SUPPLY
ROOM
L
BR
E
STAT
MAINS
BL
N
SUPPLY
SAT
ROOM
BR
L
STAT
GR
BL
L
W
ROOM
BR
STAT
GR
BL
0
ZONE VALVE
W
GR
425 Diadem/Tiara controlling gravity hot water with
ZONE VALVE
0
pumped heating using a 2 port spring return valve with
425 Diadem/Tiara controlling gravity hot water with
changeover auxiliary switch on the hot water circuit.
ZONE VALVE
pumped heating using a 2 port spring return valve with
changeover auxiliary switch on the hot water circuit.
425 Diadem/Tiara controlling gravity hot water with
5
6
pumped heating using a 2 port spring return valve with
4
changeover auxiliary switch on the hot water circuit.
5
6
N
L
E
MAINS
N
C
E
SUPPLY
MAINS
N
ROOM
5
6
N
L
L
SUPPLY
STAT
C
ROOM
L
E
STAT
SAT
FROST
CALL
C
MAINS
STAT
SAT
N
FROST
IF
SUPPLY
STAT
FITTED
ROOM
IF
CALL
L
FITTED
STAT
CALL
W
C
CALL
SAT
FROST
W
BL
STAT
IF
BL
ZONE
FITTED
VALVE
CALL
ZONE
CALL
VALVE
W
0
0
BL
GR
GR
ZONE
VALVE
MID POSITION
MID POSITION
VALVE
0
VALVE
GR
425 Tiara controlling fully pumped system using a mid
425 Tiara controlling fully pumped system using a mid
MID POSITION
position valve via room stat and cylinder stat.
position valve via room stat and cylinder stat.
VALVE
425 Tiara controlling fully pumped system using a mid
position valve via room stat and cylinder stat.
N
L
1
2
3
4
5
6
N
C
ROOM
L
1
2
3
4
5
6
STAT
C
CALL
SAT
CYL
STAT
N
C
L
1
2
3
4
5
6
ZONE
VALVE
ROOM
CALL
SAT
STAT
C
N
C
CALL
SAT
CYL
STAT
N
L
ROOM
STAT
ZONE
PUMP &
C
VALVE
BOILER
CALL
SAT
CALL
SAT
CYL
STAT
ZONE
L
VALVE
CALL
SAT
L
N
L
1
2
3
4
5
6
C
N
C
L
1
2
3
4
5
6
C
L
1
2
3
N
4
C
5
6
CALL
SAT
CALL
SAT
CYL
ROOM
STAT
STAT
C
N
C
CALL
SAT
CALL
SAT
W
CYL
ROOM
STAT
STAT
0
CALL
SAT
CALL
SAT
CYL
ROOM
STAT
STAT
N
L
N
L
PUMP
BOILER
N
L
N
L
BOILER
PUMP
N
L
N
L
PUMP
BOILER
L
5
6
N
1
2
3
4
1
2
3
4
5
6
N
C
ROOM
1
2
N
4
C
5
6
3
C
STAT
C
ROOM
CYL
C
STAT
SAT
STAT
FROST
CALL
C
CYL
STAT
SAT
STAT
N
C
FROST
IF
CALL
STAT
FITTED
CALL
SAT
ROOM
IF
CALL
C
FITTED
STAT
SAT
C
CALL
CYL
SAT
STAT
FROST
CALL
STAT
IF
FITTED
SAT
CALL
N
L
N
L
PUMP &
PUMP &
BOILER
BOILER
N
L
PUMP &
BOILER
5
5
5
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