Viessmann Vitoligno 300-P Service Instructions For Contractors page 124

Designs
Connection and wiring diagram
PCB A1
F1 Fuse, 6.3 A (slow), 250 V
F3 Fuse, 2.0 A (slow), 250 V
X1 Optolink interface
X7 Strapping plug
X10 PCB interface
X13 Boiler coding card
LON Connecting cable for data
exchange between control units
Low voltage plugs
! Outside temperature sensor/
radio clock receiver
? M1 Flow temperature sensor, heat-
ing circuit 1
?M2 Flow temperature sensor, heat-
ing circuit 2
alternative
& Collector temperature sensor in
conjunction with solar thermal
systems
% Cylinder temperature sensor
%Ê Cylinder temperature sensor in
conjunction with solar thermal
systems
Buffer temperature sensor
)↑
above
Buffer temperature sensor
)↓
below
PCB A2
F2 Fuse, 1.6 A (slow), 250 V
X4 Plug-in strip, supply system (see
page 125)
X24 PCB interface
Low voltage plugs
X2/3 Boiler water temperature
sensor
X17/19 Flame temperature sensor
124
(cont.)
aVD External hook-up (see
page 114)
aVG
KM BUS user
or
KM BUS distributor
230 V~ plugs
sÖ M1 Heating circuit pump, heating
circuit 1
sÖM2 Heating circuit pump, heating
circuit 2
alternative
sF Solar circuit pump in conjunction
with solar thermal systems
sA Circulation pump for cylinder
heating (accessories)
sL Boiler circuit pump
sK DHW circulation pump (on site)
fÖ
Power supply, 50 Hz
fÖA Power connection, internal
gÖ
Central fault message or soft
start, boiler
gS M1 Mixer motor, heating circuit 1
gSM2 Mixer motor, heating circuit 2
aBJ No function
X18/197 Feedback, deslagging drive
X19/196S Terminals 1 and 2: Limit
switch, secondary air
damper drive
X19/196P Terminals 3 and 4: Limit
switch, primary air damper
drive
X21/199 Feedback, cleaning motor