Horstmann C-Stat 11-ZW Installation Instructions Manual page 6

MAINS
SUPPLY
C-Stat ASR Receiver replacing a conventional room thermostat on a fully pumped
system with existing programmer and two spring return valves with auxiliary switches
6
Programmer
N L
ON
N
L
E
CALL
N L
PUMP
&
BOILER
HOT CENTRAL
WATER HEATING
OFF
ON
ASR Receiver
C
CYL
2
STAT
4
SAT CALL SAT
OFF
3