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4.2 Input modules (B and C versions only)
Warning
The input terminals must NEVER be connected to
voltages exceeding 30V with reference to ground.
Description of sockets for external connections
Fig. 8
Pos. Description
3 Input for reference sensor (B and C versions)
4 Input for DLC sensor (B and C versions)
5 Connection for thermostat switch test (B-version)
Note that this connection is for voltage free switches