AGL_Stream_ST_A2L_A1_4M_6M_EN_Rev00
17
NOTE: For the correct installation of the electrical fasteners on the terminal plate
connections, a tightening torque of 8.5 to 9.6 Nm for the fixation of the nuts is required.
NOTE: It is recommended to install a residual current device (RCD) in any electrical system
associated with Stream 4M* and 6M* compressors and A2L flammable refrigerants such as
R454C, R455A and R454A. The purpose of the RCD is to detect current leaks to the ground in
case of electrical issues, for example with the terminal connection pins or electrical
accessories.
Figure 17: Residual current device (RCD)
All compressors can be started Direct-On-Line.
The position of bridges required for Direct-On-Line start (depending on type of motor and/or mains
voltage) is shown in
Section 4.2.3
"Terminal box isolators and jumpers position"
.
4.2.1 Part-winding motors (YY/Y)
– Code A
Part-winding motors contain two separate windings (2/3 + 1/3) which are internally connected in star
and operated in parallel. The voltage cannot be adapted by changing the electrical connections as
the motor is only suitable for one voltage.
The first part-winding, ie, the 2/3 winding on terminals 1-2-3, can be used for part-winding start by
removing the bridges. After a time delay of 1 ± 0.1 seconds the second part-winding, ie, the 1/3
winding on terminals 7-8-9, must be brought on line.
4.2.2
Star / Delta motors (Y/∆) – Code E
This motor is interchangeable for star (Y) or delta (∆) operation by means of bridges. It is suitable for
two voltages, eg, 230 V in delta, 400 V in star connection. If the supply voltage and the nominal
voltage of the motor in ∆-connection are identical, the star connection motor can also be used for
starting (remove the bridges!).
4.2.3 Terminal box isolators and jumpers position
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
Y
Star/Delta start
∆
