Viessmann VITODENS 200 WB2A Installation & Servicing Instructions Manual page 34

4 Installation Procedure
4.10 External Controls
Alternatively connect programmer /room thermostat terminal (96) in accordance with Fig 4/M
after removing link between L and 1 routing wiring through one of the strain relief clamps.
Figure 4/M:
Other Accessories (Room Thermostat and / or Time Clocks)
External controls should be connected to the appliance as follows:
a)
Volt free switching contacts (e.g across clock switch) should be connected between
'L and 1' in place of the jumper as described above.
b)
Mains voltage power for operating any external controls is available from connector 96
(Figure 4/M). If required, remove plug 96, connect the controls cable into the plug and
replace the plug using a strain relief retaining clamp. Note that the line (brown wire)
must be connected to the terminal marked 'L', the blue wire to the terminal marked
'N' and the green / yellow wire to earth.
Room Thermostat With Anticipator Fitted
If a room thermostat with anticipator fitted is to be used, connect the switching contacts across
terminals 'L and 1' and return the neutral anticipator wire to the neutral connection in terminal 96.
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