Attention for screw compressor chiller power distribution.
1, screw chillers reach the customer site, the need to power the power line connected to the unit control cabinet. The inlet of the control cabinet is above the control cabinet. Chiller unit control cabinet power supply line must be higher than the unit 1 meter, and the control cabinet can not be pressed. Connect the power cord to the terminals R, S, T, N, and then tighten the terminals after the first 24 hours (the shortest possible time).
2, in addition to screw chiller itself control the electrical box, the other supporting water pump, water tower fan control cabinet, electric control cabinet in the power part includes: the total power wiring copper, Y-Δ compressor start the electrical device.
3, the domestic standard screw chillers working power is 3N ~, AC380V, 50Hz. The external power supply must meet the electrical characteristics of the unit to ensure the service life of the unit, the power supply voltage deviation is preferably less than 5%, the total power supply by the chiller on the back of the upper part of the electric control cabinet access hole, and power wiring copper or terminal block , Complete the power wiring.
4, all the power supply circuit should be installed in accordance with national electrical norms.
5, connected to the screw chiller control cabinet power cable specifications should be based on the nameplate on the rated current selection. The total power supply must be a certain margin, the proposed value for the unit, pump, water tower parameters of 1.25 to 1.3 times more. The current carrying capacity of the power supply cable (wire) should be slightly larger than the maximum operating current of the chiller and the influence of the working environment should be taken into account. Electronic control box with a connection to the ground and automatic circuit protection measures, user-owned power must be equipped with this measure. High current unit, should be used dual power supply, but the two power supply wire diameter must be equal, and belong to the same brand.