Ariston ST 50 ProTech Instructions For Installation, Servicing & Operation page 18

DIRECT SYSTEMS
A mains supply of 240V, 3kW (13 amps) Is required. Heat resistant cable,
round 3 or 4 core 2.5mm^ {to BS6141 table 8) must be used to connect the
electrical supply through the Economy 7 time control switch using either
system 'A' or 'B' as illustrated in Fig. 3.12.
ECONOIY 7
CONTROLLER
SYSTEM A
PtG. 3.12
irPER a£»CHT
JDAYTIME TOP UPl
LOtCR ELOCNT
tHIGHT STQR£>
M.L HOURS
SUPPLY
tlal
SYSTEM B
LOCR ELOCMT
ST9E)
i