Ferroli F 24 B Instructions For Installation, Use And Maintenance Manual page 32

Main printed circuit board
Secured by flour plastic tabs the PCB is situated inside the control compartment. The transformer for
low voltage AC is attached to the PCB as is the DC rectifier. Potentiometers control C.H. output and
maximum D.H.W. temperature, both are adjustable by the controls on the facia and because the boiler
features automatic range rating no adjustments need to be made. Electro mechanical relays control
pump operation and put switched live to the ignition PCB (demand relay), they have transparent plastic
covers so that their contacts can be seen moving.
Air pressure switch
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 only uses two terminals, the middle terminal is not used.
Short spares list
KEY NO.
(from fi g 19)
14
16
34
42
43
44
49
81
82
136
27
126
32
DESCRIPTION
Safety Valve C/W Manifold
Fan assembly
Central Heating Flow Temperature Sensor
Domestic Hot Water Flow Temperature Sensor
Air Pressure Switch
Gas Valve - VK4105G
Overheat Safety Thermostat 100°C
Ignition Electrode
Flame Sensing Electrode
Flow Meter C/W Elbow
Main PCB MF03.1
Heat Exchanger
Flue gas safety thermostat
Ferroli F 24 B
PART NO. G.C. NO.
805880 E39-485
800480 E23-851
800320 E23-839
800320 E23-839
800150 E23-840
808000 E23-768
801240 386-815
806258 E26-348
801438 E23-855
805910 E39-465
805900 E39-470
807480 E77-470