Technical data

135
Function description – Vitocontrol-S, VD2/CT3/CM2
Components from the parts list
Line voltage motherboard
The main Printed Circuit Board
comprises:
Relays and outputs for controlling
pumps, actuators and the burner.
Slot for power supply unit and boiler
control unit.
Low voltage motherboard
The main Printed Circuit Board
comprises:
Connection plug for sensors,
communication connections and
external connections.
Slot for Printed Circuit Board, LON
communication module, programming
unit, boiler coding card and Optolink
Printed Circuit Board.
Power supply unit Printed
Circuit Board
The power supply unit Printed Circuit
Board comprises the low voltage supply
for all electronic equipment.
Safety unit
The safety unit comprises:
Fuses
Power ON/OFF switch
Test button
Supplementary Printed Circuit
Board
When replacing the Printed Circuit
Board:
1. Record the coding and adjustments
made at the control unit.
2. Replace the Printed Circuit Board.
3. Set coding 8A: 176, and coding
address 92 to 92: 160.
Printed Circuit Board
Optolink/override switch
The Printed Circuit Board comprises:
Burner standby display
Fault display
Optolink laptop interface
Override switch
Override switch for flue gas
measurement with briefly raised boiler
water temperature.
The following functions are triggered in
position h:
Burner start (may be delayed through
fuel oil pre-heating, or other
accessory equipment).
Starting all pumps.
Control of the boiler water
temperature by the R adjustable high
limit.
Programming unit
Setting the:
Heating program
Set values
Coding
Displaying:
Temperatures
Operating conditions
Faults
Fuses
F1: 6.3 A (slow), 250 V,
to protect the actuators, pumps, and
all electronics.
F2: 6.3 A (slow), 250 V,
to protect the burner.
5351 340 v1.4