GEA Bock HG12Р CO2 - Manual (Page 14)

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5.3 Circuit diagramm for direct start 230 V ∆ / 400 V Y
Fig. 17
R1 Cold conductor PTC sensor motor winding
R2 Thermal protection thermostat (PTC sensor)
F1 Load circuit safety switches
F2 Control power circuit fuse
F3 Safety chain (high/low pressure monitoring)
B1 Release switch (thermostat/pressostat)
Q1 Main switch
Compressor terminal box