Secure SRT323 User And Installation Instructions Manual page 18

Fully Pumped Heating System using SRT323 room
stat, cylinder stat and Two (2 Port) Spring Return
Valves with auxiliary switches and a Secure
SHP021 / SHP027 electronic programmer.
E
MAINS
N
SUPPLY
L
This diagram is schematic and should be used for
guidance only.
N L 1 2
CYL
STAT
ZONE
VALVE
L N
PUMP &
BOILER
3 4 5 6
1
SRT323
ROOM
STAT
4
ZONE
VALVE
FROST
STAT IF
FITTED
18