Designations of component connections

Designations of component connections

The component connections are marked with numbers. These markings (a 1- or 2-digit number) are standardised and can be found near the connections. 0 Suction connection1 Energy feed2 Energy outlet (not into the atmosphere, see 3)3 Atmospheric connection4 Control connection (input on component)5 free6 free7 Antifreeze connection8 Lubricating oil connection9 Cooling water connection A 2-digit number must be provided when several connections of the same kind exist.They may be chosen freely by the manufacturer; the connection designations below are exceptions to this: 71 Antifreeze feed72 Antifreeze drain81 Lubricating oil feed82 Lubricating oil drain91 Coolant feed92 Coolant drain