Secure SRT323 User And Installation Instructions Manual page 17

Fully Pumped Heating System using SRT323 room
stat, cylinder stat and Three Port Mid Position
Valve with a Secure SHP021/SHP027 electronic
programmer.
MAINS
SUPPLY
MRG POSITION VALVE
This diagram is schematic and should be used for
guidance only.
N
E
N
L
W
BL
0
GR
L 1 2 3
1 CYL
STAT
4
L N
PUMP &
BOILER
4 5 6
1
SRT323
ROOM
STAT
4
FROST
STAT IF
FITTED
17