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Ⅰ. Overview

Air-conditioning circulating pump is the core power equipment in air-conditioning water circulation systems. The primary function is to provide continuous and stable momentum for the cold/hot water in air-conditioning systems, driving the water circulation between evaporator (or condenser), heat exchanger, and terminal device (such as fan coil and air conditioning unit) as a closed- loop, realize the transfer and exchange of cold and heat, ensure the effective of the air-conditioning system in regulating indoor temperature.

In the cooling condition, the circulating pump push the cold water through indoor end device, absorbing indoor heat and become the warm water, the water return to the air conditioner’s evaporator, where refrigerant absorb the heat, water cold, complete the cooling cycle. For heating condition (e.g., with boilers or heat pumps), the pump circulate the hot water through end equipment to release heat indoor; once cooled, the water flows back to the heat source for reheating, realize the heating cycle.

Picture of on-site electrical cabinet and motor:

Ⅱ. Solution

1．Electrical Wiring

The frequency Inverter and motor are at a certain distance apart; both require the proper grounding. the inverter on site drive a 45KW motor: DI1 (start given terminal), AO1 (frequency output), one group of relays TA1/TC1( feedback operating signal), the other group TA2/TC2 (feedback alarm signal); RST connect to the power supply, UVW to the motor.

2．Frequency inverter Specification

The motor is 45KW, the rated current is 91A, rated speed is 1480rpm. Based on the motor model, the inverter model YD580T4-37G/45P-T is selected , which with a rated current of 91A.

3．Frequency Inverter Commissioning Parameter

4．On-Site Operation Status

The on-site frequency inverter operate at 50HZ with a current of 68A, and the three phases are balanced.

Ⅲ. Features

The air-conditioning circulating pump solution is not merely a simple combination of individual devices, but a comprehensive plan that integrates the air-conditioning system's load characteristic, operating condition, energy-saving requirement, and later operation and maintenance scenario. A high-quality solution must achieve optimized energy consumption, cost control, and intelligent management while ensuring stable system operation.

Ⅳ. Conclusion

In summary, a high-quality air-conditioning circulating pump solution is not a mere stack of equipment, but a systematic offering built around five core dimensions: "energy efficiency, intelligence, stability, adaptability, and environmental friendliness." It not only addresses the pain points of traditional circulating pump—such as "high energy consumption, cumbersome operation and maintenance, and poor adaptability"—but also align with the development trend of modern air-conditioning systems toward "low carbonization, intelligence, and refinement." Through in-depth energy-saving design, it reduces lifecycle energy cost; via intelligent control technology, it eases manual operation and maintenance pressure; by virtue of working condition adaptation and redundancy protection, it ensures uninterrupted system operation; with flexible adaptability, it meets diverse scenario need; and through eco-friendly, low-noise design, it complies with green building standard. Ultimately, it delivers an "efficient, reliable, economical, and environmentally friendly" power system for air-conditioning water circulation to the user.