Emerson Copeland Discus Series Application Manuallines page 3

3.2.2 Low-pressure control ............................................................................................ 14
3.2.3 Internal pressure relief valve ................................................................................ 14
3.2.4 Oil pressure switch ............................................................................................... 14
3.2.5 Maximum allowable pressures ............................................................................. 15
3.3 Brazing procedure ............................................................................................................ 15
3.4 Screens ............................................................................................................................ 15
4 Electrical connection ...................................................................................... 16
4.1 General recommendations............................................................................................... 16
4.2 Electrical installation ........................................................................................................ 16
Single-phase motors - Code C ............................................................................ 16
4.2.1
4.2.2 Three-phase motors ............................................................................................. 17
Direct-on-line start motors - Code T .................................................................... 17
4.2.3
Star-delta motor (Y/∆) - Code E .......................................................................... 17
4.2.4
Part-winding motor (YY/Y) - Code A ................................................................... 17
4.2.5
4.3 Wiring diagrams ............................................................................................................... 17
4.4 Protection devices ............................................................................................................ 17
4.5 Motor protection ............................................................................................................... 18
Over-current thermal protection switch for single-phase motors - System A ...... 18
4.5.1
Thermistor protection - System W ....................................................................... 18
4.5.2
4.6 Discharge temperature protection ................................................................................... 19
4.7 Demand Cooling .............................................................................................................. 20
4.8 Oil pressure control .......................................................................................................... 20
4.8.1 Oil pressure switch (OPS2) .................................................................................. 20
4.8.2 SENTRONIC Oil pressure control ........................................................................ 21
Oil pressure switch - ALCO FD 113 ZU (A22 - 057) ........................................... 21
4.8.3
4.8.4 Crankcase heaters ............................................................................................... 22
5 Starting up & operation................................................................................... 23
5.1 Leak test........................................................................................................................... 23
5.2 System evacuation ........................................................................................................... 23
5.3 Preliminary checks - Pre-starting .................................................................................... 23
5.4 Charging procedure ......................................................................................................... 23
5.5 Initial start-up ................................................................................................................... 24
5.6 Minimum run time ............................................................................................................ 24
5.7 Recommended inverter range ......................................................................................... 24
6 Maintenance & repair ...................................................................................... 25
6.1 Exchanging the refrigerant ............................................................................................... 25
6.2 Refrigerant retrofit from HFC to HFO/HFC blends .......................................................... 25
6.3 Shut-off valves ................................................................................................................. 25
6.4 Compressor replacement................................................................................................. 25
6.5 Lubrication and oil removal .............................................................................................. 25
D6.3.4/0715-0716/E