Temperature Sensors (Thermistors); Limit Thermostats; Ignition Pcb; Main Printer Circuit Board - Ferroli F30 Installation, Servicing And User Instructions Manual

8.04 Temperature sensors (thermistors)

Identical, but individual, negative temperature co-effi cient (NTC) thermistors are fi tted in the C.H. and D.H.W. outlets
from the heat exchanger. As the water temperature increases the resistance in the thermistor decreases. This causes
the PCB to reduce the voltage to the modureg, in turn reducing the burner pressure. The wiring for each thermistor
is colour coded red for C.H. and blue for D.H.W. The sensors are fi tted in wet pockets.
8.0 imit thermostats
Two surface mounted auto reset bi-metal thermostats are located on the heat exchanger secured b spring
clips. Heat sink compound is used.
8.0 nition
ocated to the right hand side of the electrical control compartment accessed b lowering the facia then
removing the rear cover.
8.0 ain printe ir uit oar
ecured b three screws, the PCB is situated inside the control compartment. The transformer for low voltage
AC is attached to the PCB as is the DC rectifi er. Potentiometers control C.H. output and maximum D.H.W.
temperature, both are ad ustable b the controls on the facia and because the boiler features automatic
range rating no ad ustments need to be made.
put switched live to the ignition PCB (demand rela ), the
contacts can be seen moving.
8.08 Air pressure swit h
Operating at 230 V AC and situated next to the fan. Different coloured tubes connect the switch to the fan. It is a
make on pressure switch and onl uses two terminals, the middle terminal is not used.
8.09 Short spares list
.
( rom )
14
16
34
39
42
43
44
49
50
81
82
136
27
S T
afet Valve
Fan
Central Heating Flow Temperature ensor
Cold water fl ow limiter
Domestic Hot Water Flow Temperature ensor
Air Pressure witch
Hone well Gas Valve
Overheat afet Thermostat 100°C
High imit Thermostat 88°C
Ignition lectrode °/N fi xing Bracket
Flame ensing lectrode
Flow Meter
Main PCB MF03
Heat xchanger
lectro mechanical rela s control pump operation and
have transparent plastic covers so that their
800130
800480
800320
800150
800266
801270
800160
806460
801438
803430
802180
A T . . .
386-816
23-851
800320 23-839
23-839
23-840
23-768
386-815
386-577
23-855
03-340
23-919
.
37