56
Components
Components from the parts list
For parts list, see page 105.
Main PCB
The main PCB comprises:
H
Relay for selecting pumps, the
mixer motor and the burner
H
Sockets for sensor connection
H
Sockets for the mains power
supply connection, heating circuit
pumps, mixer motor and burner
H
Fuse F2, 4 A (slow)
Supplementary PCB
All data is processed and outputs
(relay) are selected.
Power supply unit PCB
The power supply unit PCB
comprises the low voltage supply for
all electronic equipment.
Front panel with heating
circuit selector keys
Display and selection of the heating
circuit.
Optolink/emissions test
switch PCB
The PCB comprises:
H
Burner standby display
H
Fault display
H
Optolink laptop interface
H
Emissions test function
Emissions test switch for testing flue
gas with briefly raised boiler water
temperature.
The following functions are triggered
in position
h
:
H
Burner start
(may be delayed through fuel oil
preheating or Vitoair draught
stabiliser)
H
Starting all pumps
H
Mixer remains set to control
function
H
Control of the boiler water
temperature by control
thermostat
R
Fuses
F1: 6.3 A (slow), 250 V,
max. power loss
x
2.5 W,
to protect the total device, burner,
pumps and electronics
F2: 4 A (slow), 250 V,
max. power loss
x
1.6 W,
to protect the pumps and the mixer
motor
5862700GB
