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AGL_HA_ST_Discus_A2L_A1_EN_Rev00 17

4.2.3 Terminal box jumpers positions

Part-winding motors can be connected direct-on-line or part-winding start:

Part-winding motor:

Y-Y

Code A

Direct-on-line start

Y-Y

Part-winding start

First start step 1-2-3

Y-Y

Star / Delta motors can be connected direct-on-line or Star / Delta start:

Star/Delta motor

Y-∆

Code E

Direct-on-line start

∆

Direct-on-line start

Star/Delta start

Y-∆

Figure 18: Jumpers positions

4.3 Terminal box

WARNING

Ignition source in a potentially flammable atmosphere! Fire hazard!

Particular attention must be paid in A2L-refrigerant systems as any work on

the energized terminals in the

compressor terminal box could create an

ignition. Do not touch the energized terminals with a tool or cable when the

compressor is energized.

Compressors operating with flammable refrigerants shall use only the qualified

terminal box supplied with the compressor.

The terminal box is IP54 for all 2D*, 3D* and 8D* semi-hermetic compressor models.

Cable glands have an influence on the protection class of the terminal box. Factory-fitted cable

glands reduce the protection class to IP41. The use of appropriate cable glands is strongly

recommended in order to maintain the IP protection class.

Figure 19: Cable glands

4.4 Electrical protection

Independently from the internal motor protection, fuses must be installed before the compressor. The

selection of fuses has to be made according to VDE 0635, DIN 57635, IEC 269-1 or EN 60-269-1.

Emerson Copeland 2D User Manual

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