17
FERtech 25 OV
Cod. 3540U431 - 11/2009 (Rev. 00)
fig. 16b
Wiring diagram
4 3 2 1
Junction Box
N
L
1 2 3 4 5 6 7 8 9 10
PROGRAMMER
NEUTRAL
LIVE
CH ON
DHW ON
DHW OFF
BLUE
WHITE
GREY
ORANGE
Room Thermostat
Cylinder Thermostat
N
E
L
240 Vac
Honeywell V4073H mid position
3 WAY ZONE VALVE
2
1
C
Terminal 5 - SWITCH LINE
L
6 5
Central
heating
pump
N E L
Pre-Fitted flex
from boiler
Remove
Link
between
terminals 5-6
2.6 Flue system
The unit is “type C” with a
sealed chamber
and forced draught, the air inlet and flue outlet must be
connected to one of the following flue systems. With the aid of the tables and methods of calculation indi-
cated, before commencing installation, it is first necessary to check that the flue system does not exceed
the maximum permissible length. The current standards and local regulations must be observed.
It should be noted that only Fer flue system and accessories should be used on this appliance,
as per BS 5440 2000 and C.E. test certification.
FERtech “Y” Plan
Pipe layout
Auto air vent
Automatic
bypass
(mimimum flow of 6LTR/min.)
OPTIMAX
FERROLI
BOILER
Balancing
valve
A.A.V
A.A.V
*Note: cold feed and expansion
not shown for clarity
(see fig. 15)
fig. 16a
