Explore our premium grade refrigeration parts, custom brass split service valves, charging tools, and high-performance climate control components.
Ningbo Taojun Refrigeration Equipment Co., Ltd. is strategically situated in Xiangshan, Ningbo, a highly connected coastal manufacturing node in China. Founded in 1988, our rich manufacturing heritage traces back to our predecessor, the prestigious Xiangshan Refrigeration Accessories Factory of Zhejiang University. This core scientific and technical foundation has propelled us to become a recognized global leader in HVAC/R components, specialized electrical time-delay controllers, and refrigeration systems elements.
With over 35 years of engineering experience, our focus has expanded from basic filters and brass check valves to advanced industrial-grade control devices. Our specialized product range includes time delay relays, defrost timer thermostats, intelligent AC control systems, electrolyte motor capacitors, and custom heat dissipation tubes. Our commitment to technology-driven performance earned us the designation of a National High-Tech Enterprise in 2021.
Through rigorous quality policies and global compliance frameworks, we hold active certifications under ISO9001:2015, US UL safety standards, and EU RoHS/REACH environmental directives. Our proprietary brands and OEM modules have established strong commercial partnerships with leading multinational household appliance corporations, including Midea, Gree, Haier, Xinfei, Whirlpool, Electrolux, and Huarui.
A comprehensive review of our technical systems, component designs, and operational quality control infrastructure.
Our core production arrays, high-speed stamping systems, and copper processing stations are imported directly from Germany, ensuring sub-micron manufacturing tolerances.
Supported by 15 senior research engineers. Our development lab works in direct synergy with doctoral faculties from the University of Science and Technology of China and Zhejiang University.
We configure precise timing delays, voltage operational limits, pin configurations, and environment-resistant shell casings to meet exact application blueprints.
We source premium ITO films and ultra-uniform liquid crystal spacers from Japan, high-grade sealing adhesives from Europe, and high-purity copper to guarantee longevity.
Each timing component undergoes 500 hours of continuous high/low temperature tests (75°C to -35°C), high-voltage testing at 100V, thermal shock tests, and helium mass spectrometer leak detection.
Real-time manufacturing execution systems track raw material batches, quality inspection data, and process parameters for 100% component traceability.
How our heavy-duty copper filter driers, timing systems, and electronic components operate within industrial pipelines.
A history of engineering growth and a culture built on quality, transparency, and collaboration.
A global brand requires a solid corporate culture. At Taojun, we build relationships through mutual trust and technical excellence:
A look inside our automated assembly lines, testing chambers, and calibration laboratories.
German-engineered stamping and high-speed CNC copper forming equipment.
Cleanroom assemblies for solid-state controllers, microchips, and relays.
Environmental chambers for extreme thermal fatigue testing.
Our operational systems comply with international quality management standards.
ISO 9001:2015 Quality Certificate
Verified Scope of Registration
UL Safety Standards Compliance
RoHS & REACH Compliance
Verify our GB/T19001-2016 / ISO9001:2015 registration (No. 41325Q00065R0S) directly at the official database of the Certification and Accreditation Administration of China (CNCA) at www.cnca.gov.cn or our partner agency Zhongci International at www.zcgirz.com.
A reliable service framework supporting your procurement process from initial inquiry to long-term deployment.
A technical guide on component architecture, time delay logic, and key factors for system integrators.
Time Delay Relays (TDRs) are critical components in modern electrical engineering, control automation, and HVAC/R (Heating, Ventilation, Air Conditioning, and Refrigeration) configurations. By controlling when circuit contacts open or close, these relays protect expensive motors and compressors from electrical surges, prevent rapid short cycling, and help manage multi-device power-on sequences. In commercial setups, managing these timing parameters is key to extending the life of your equipment.
Without proper delay logic, components like HVAC compressors can suffer from short cycling. This occurs when a system shuts off and restarts too quickly, before system pressures have balanced. The resulting electrical inrush currents create high heat that can degrade motor windings and lead to premature failure. Taojun's timing controllers and defrost timers provide reliable, calibrated delays to ensure safe system operation.
Industrial systems use both mechanical and electronic (solid-state) timing solutions. Mechanical timers use motor-driven gears to open and close contacts. While reliable for standard cycles (like daily refrigerator defrost cycles), mechanical systems are prone to wear over time and have limited timing adjustment ranges.
In contrast, solid-state timing relays use microcontrollers or analog resistor-capacitor (RC) networks to manage timing. They have no moving internal parts, making them highly resistant to vibration, shock, and mechanical wear. This makes them ideal for demanding environments like automotive HVAC systems, transport refrigeration, and heavy industrial equipment.
High-performance timing relays require premium components. Electrical contacts must handle high inrush currents without pitting or welding together, which is why we utilize high-purity silver-alloy contacts. Structural components must resist heat and prevent electric tracking; our outer housings use flame-retardant polymers that meet UL 94 V-0 safety ratings.
Sealing is also critical in refrigeration applications. Moisture or airborne dust can penetrate control units, causing contact oxidation or short circuits. Taojun addresses this by using hermetically sealed enclosures, moisture-resistant protective coatings on PCBs, and automated testing to confirm IP-rated dust and water protection.
Expert answers to common engineering, installation, and procurement questions.
Examine our full lineup of universal AC control systems, defrost timers, aluminum capacitors, and related HVAC connection kits.
Taojun