Fer FERtech 25 OV - Page 16

FERtech 25 OV
16
Cod. 3540U431 - 11/2009 (Rev. 00)
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.
Wiring diagram
4321
Junction Box
NEL
Terminal 5 - SWITCH LINE
12345678910
PROGRAMMER
DHW ON
CH ON
NEUTRAL
LIVE
CH
zone
valve
DHW
zone
valve
Room Thermostat
Cylinder Thermostat
N
E
L
230 Vac
BROWN BLUE
GREY ORANGE
L
6
5
Central
heating
pump
N
E
L
Pre-Fitted flex
from boiler
Fig. 15b
Remove
Link
between
terminals 5-6
OPTIMAX
FERROLI
BOILER
Balancing
valve
C.H.
Zone Valve
Automatic
bypass
(mimimum flow of 6l/min.)
A.A.V
A.A.V
DHW
zone
valve
*Note: cold feed and expansion
not shown for clarity
(see fig. 12)
Auto air vent
Fig. 15a
FERtech “S” Plan
Pipe layout