Electrical Connection - Emerson Copeland 4MF-13X User Manual

Screens
CAUTION
Screen blocking! Compressor breakdown! Use screens with at least 0.6 mm openings.
The use of screens finer than 30 x 30 mesh (0.6 mm openings) anywhere in the system should be avoided with these compressors. Field
experience has shown that finer mesh screens used to protect thermal expansion valves, capillary tubes or accumulators can become
temporarily or permanently plugged with normal system debris and block the flow of either oil or refrigerant to the compressor. Such
blockage can result in compressor failure.

Electrical Connection

General Recommendations
The compressor terminal box has a wiring diagram on the inside of its cover. Before connecting the compressor, ensure the supply
voltage, the phases and the frequency match the nameplate data.
Electrical Installation
Three-phase Motors
All compressors can be started direct-on-line.
The necessary position of bridges for direct-on-line start (depending on type of motor and/or mains voltage) is shown in page 16, Wiring
Diagrams.
Star / Delta Motors (Y/Δ) – Code E
With the help of bridges, this motor is interchangeable for star (Y) or delta (Δ) operation. It is suitable for two voltages, eg, 230V in delta,
400V in star connection. If the supply voltage and the nominal voltage of the motor in Δ-connection are identical, the star connection
motor can also be used for starting (remove the bridges!).
Part winding Motors (YY/Y) – Code A
PWS motors contain two separate windings (2/3 + 1/3) which are internally connected in star and operated in parallel. You cannot
change the voltage by changing the electrical connections as the motor is only suitable for one voltage.
The first part winding, i.e., the 2/3 winding on terminals 1-2-3, can be used for part-winding start (remove the bridges!). After a time
delay of 1 ± 0.1 seconds, the second part winding, i.e., the 1/3 winding on terminals 7-8-9, must be brought on line.
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