Ferroli OPTIMAX HE 18 OV Instructions For Use, Installation And Maintenance page 16

Central heating Demand
The heat demand can be controlled by the room thermostat (terminal 5-6) or by a switch line 230 V
(terminal 5).
Standard Systems
For a general pipe layout and wiring diagram on the "S" and "Y" plan systems please see fig.
15a, 15b, and 16a, 16b.
OPTIMAX "S" Plan
Pipe layout
Remove
Link
between
terminals 5-6
PROGRAMMER
DHW ON
NEUTRAL
16
OPTIMAX
FERROLI
BOILER
*Note: cold feed and expansion
not shown for clarity
(see fig. 12)
Junction Box
6 5 4 3 2 1
L N E L
Terminal 5 - SWITCH LINE
CH ON
LIVE
BROWN BLUE
CH
zone
valve
DHW
zone
valve
Cod. 3540M162 - 02/2008 (Rev. 00)
OPTIMAX HE 18 OV
A.A.V
A.A.V
Auto air vent
DHW
zone
valve
Balancing
valve
C.H.
Zone Valve
Automatic
bypass
(mimimum flow of 6l/min.)
Wiring diagram
Central
heating
pump
1 2 3 4 5 6 7 8 9 10
Fig. 15a
N
E
L
230 Vac
fused at
3 amps
Room Thermostat
Cylinder Thermostat
Fig. 15b