Ferroli OPTIMAX 25 S Instructions For Use, Installation And Maintenance page 14

OPTIMAX "Y" Plan
Remove
connection
between
terminals 4-5
PROGRAMMER
NEUTRAL
LIVE
CH ON
DHW ON
DHW OFF
3 WAY ZONE VALVE
BLUE
WHITE
GREY
ORANGE
14
OPTIMAX
FERROLI
BOILER
Automatic
bypass
(mimimum flow of 6l/min.)
Junction Box
5 4 3 2 1
L N L
Terminal 4 - SWITCH LINE
Pipe layout
Auto air vent
Wiring diagram
Honeywell V4073H mid position
The heating system must have an automatic
bypass capable of
passing 6 litres/minute
1 2 3 4 5 6 7 8 9 10
Optimax 25 S
fi g. 7a
N
E
L
240 Vac
fused at 3 amps
Room Thermostat
2
C
1
Cylinder Thermostat
fi g. 7b