Danfoss SET3M Installation & User's Instructions page 10

Typical fully pumped system with 3-port mid-
position valve
Mains
Supply
Cylinder
Stat
N
Other Danfoss Randall products suitable for use with above circuit:-
AT cylinder thermostat;
RMT room thermostat;
HS3 3-port mid-position valve with spring return actuator
10
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Terminals
N
L
3 amp fuse
Boiler
and
Pump
D.H.W
on-com-off / on-com-off
N L 1 2 3 4
3-port
N
mid-position
valve
HTG
5 6
Room Stat