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Typical control of Heating when provided by
Combination type Boiler
1
ROOM
'STAT
COM
Typical Heating & Hot Water control system using 3 port
mid-position valve
1
ROOM
'STAT
WHITE
OR
BLUE
BROWN
MID-POSITION VALVE
2
3
CALL
N
INPUT OUTPUT
2
3
LINK
CYL.
COM
'STAT
SAT
N
RED OR
GREY
ORANGE
5
6
COMBI BOILER
N
L
TERMINALS
5
CALL
L
N
103E5
TERMINALS
L
MAINS
N
SUPPLY
FUSED
3 AMP
6
103E5
TERMINALS
L
MAINS
N
SUPPLY
FUSED
3 AMP
BOILER &
PUMP
TERMINALS
9
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