Emerson Copeland 4MF-13X Application Manuallines page 31

Legend
A1 ....... CoreSense Protection module
A2 ....... OPS2 Oil pressure switch
A5 ....... Compressor terminal box
F6 ....... Fuse for control circuit
F7 ....... Fuse for control circuit
F8 ....... Fuse for control circuit
F10 ..... Thermal protection switch M21
Figure 33: Wiring diagram – Star/Delta motors (EW...)
4.5.3.3 Oil differential pressure control
The oil pressure switch breaks the control circuit when the pressure difference between the oil pump
outlet and the crankcase is too low. The switch must be properly adjusted and tamper-proof. If the
oil differential pressure drops below the minimum acceptable value the compressor will be stopped
after a 120-second delay. After having solved the problem the control has to be reset manually.
NOTE: Proper oil pressure safety control with an approved switch is a condition of warranty!
The following oil pressure switches can be delivered as accessories:
▪ Electronic oil pressure switch OPS2
▪ Mechanical oil pressure switch ALCO FD-113ZU, applicable only for A1 refrigerants
Electronic oil pressure switch – Alco Controls OPS2
WARNING
Ignition source in a potentially flammable atmosphere! Fire hazard! The
electronic oil pressure switch is not an ignition source during normal operation
in an A2L-refrigerant system but could become one if not installed and
connected properly.
28
K1 .......... Contactor M1
K2 .......... Contactor M1 Y-connection
K3 .......... Contactor M1 Δ-connection
M21 ........ Fan motor / condenser
R2 .......... Crankcase heater
Y21/22 ... Solenoid valve capacity controls
Y3 .......... Solenoid valve unloaded start
AGL_Stream_ST_A2L_A1_4M_6M_EN_Rev00