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Three-phase compressors (TF*) with internal motor protection:
Power circuit
Motor terminal connections
Three-phase compressors are connected to
the T1, T2 and T3 connections
Legend
B1 ............. System controller
B3 ............. Discharge gas thermostat
F1, F6...F8 Fuses
F3 ............. HP limiter
F4 ............. LP limiter
Figure 15: Wiring diagrams for three-phase YB*K1E compressors
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.
CAUTION
Mechanical stress or shock! Overheating! Terminal Fusite damage and
leakage! Mechanical stress and shocks to the Fusite must be avoided as they
could damage the glass and/or ceramic. This might result in hermetic failure
or loss of terminal performance. Precautions are required to prevent striking
or bending of pins. Bent or damaged pins may result in loss of hermeticity
and/or terminal performance.
Ensure correct connection of cables to the compressor terminal Fusite to avoid
local overheating of Fusite pins which might lead to refrigerant leaks.
The terminal box is IP54 for all YB*K1E compressors. This terminal box variation cannot be applied
in an ATEX environment.
Cable glands have an influence on the protection class of the terminal box. Emerson strongly
recommends using appropriate cable glands according to EN 50262 in order to reach the rated
protection class. Examples of correct electrical installations are shown in Figure 16 below.
AGL_Ref_ST_YBK1E_EN_Rev03
Control circuit
K1, K2 ..... Contactors
Q1 ........... Main switch
R2 ........... Crankcase heater
S1 ........... Auxiliary switch
RCD ........ Residual current device (A2L systems)
19
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