UL 207 Components and Accessories Containing Cooling, Non-Electrical.

The requirements described in the “UL 207 Refrigerant-containing components and accessories, non-electric” standard, developed by Underwriters Laboratories (UL), cover non-electric refrigerant-containing components and accessories that are filled with refrigerants defined for use in refrigeration systems, air conditioning equipment, or both, and designed for field installation in accordance with the “ANSI/ASHRAE 15 Safety standard for refrigeration systems and identification and safety classification of refrigerants” standard. The requirements also apply to components and accessories designed by manufacturers for use in factory-assembled systems or units. In this case, the component or accessory is also evaluated under the requirements applicable to the relevant system or unit.

These requirements do not apply to:

• Electric valves and electric refrigeration controllers, hermetic refrigerant motor-compressors, and the like, considered separately, as individual requirements or as part of them.
• Electrical components of assemblies that include components or accessories containing refrigerant.
• Pressure vessels that fall under Part VIII of the ASME Code for Boilers and Pressure Vessels and bear the ASME code symbol “U”.

UL 207 is a safety standard developed for components and accessories containing refrigerants, and it focuses particularly on flexible cables and appliance hose valves.

This standard contains comprehensive requirements for the construction, performance, and testing of valves used in refrigeration and air conditioning systems. Its aim is to reduce the risks associated with mechanical failure, leakage, and incorrect material selection. Because these valves are often exposed to varying pressures, temperatures, and refrigerant types, standardized assessment is essential for safe and reliable operation. The UL 207 standard covers a range of aspects, including design specifications, pressure ratings, durability testing, resistance to vibration and corrosion, and proper sealing against leaks. In short,

• It discusses the design and performance of valves for cooling systems.
• It emphasizes resistance to leakage, pressure changes, and corrosion.
• This applies to products serving residential, commercial, and industrial environments.

Manufacturers designing valves for use with refrigerants in heating, ventilation, air conditioning, and refrigeration equipment must demonstrate compliance with the UL 207 standard. These requirements apply to both component parts and complete valve assemblies. This standard specifies the necessary tests for durability under repeated operating conditions, prolonged exposure to refrigerants, and the ability to maintain seal integrity under specified operating conditions. UL 207 compliance is generally a prerequisite for market access in North America and serves as a benchmark for product evaluation in other regions.

Critical test requirements of the UL 207 standard include mechanical durability checks, hydrostatic and pneumatic pressure tests, durability cycling, refrigerant exposure verification, and corrosion resistance assessment. These tests are performed according to defined protocols to ensure reliable and safe valve performance in various scenarios.

In short, the UL 207 standard,

• By establishing clear protocols for the design and testing of flexible cable and hose valves used in refrigerant-containing systems, it protects end-users and system integrity.
• It necessitates rigorous design and testing processes.
• It improves the safety and performance of cooling system components.
• It helps manufacturers meet regulatory standards.
• It ensures long-term reliability even under demanding working conditions.

The UL 207 standard is a key safety benchmark used in the refrigeration and HVAC industry. This standard specifies safety requirements for mechanical refrigeration components that contain refrigerant but are not primarily electrically operated. It plays a vital role in ensuring the safety, durability, and reliability of refrigeration systems used in commercial, industrial, and residential applications.

The primary goal of the UL 207 standard is to reduce the hazards associated with refrigerant leaks, pressure failures, material degradation, and improper assembly of refrigeration system components. This standard applies to components designed for:

• Cooling systems
• Air conditioning equipment
• Heat pump systems
• Factory-assembled HVAC units
• Cooling accessories installed on site.

This standard is closely aligned with the ASHRAE 15 standard, which regulates the safety of mechanical refrigeration.

The UL 207 standard applies specifically to components and accessories containing non-electrical heat sinks. For example,

• Cooling line sets
• Mechanical valves
• Fittings and connectors
• Filters and filter dryers
• Receivers and accumulators
• Hoses and pipe fittings
• Pressure-sensitive accessories
• Mechanical regulators

This standard evaluates whether these components can safely withstand operating pressures, environmental stresses, vibration, corrosion, and prolonged coolant exposure.

This standard excludes several categories covered by other standards. For example,

• Electric valves
• Cooling controllers
• Hermetic motor compressors
• Electrical components
• ASME coded pressure vessels with the symbol "U"

The UL 207 standard includes comprehensive testing and construction requirements. Some of the most important evaluation areas are:

• Pressure testing: Components must withstand pressures significantly above normal operating conditions to verify structural integrity and leak resistance.
• Fatigue and durability testing: Repeated pressure cycling simulates years of real-world operation to ensure components do not crack or fail over time.
• Corrosion resistance: Materials are tested against moisture, coolants, oils, and environmental contaminants that can impair performance.
• Material compatibility: This standard verifies that gaskets, elastomers, plastics, and metals remain stable when exposed to approved refrigerants.

In conclusion, the UL 207 standard is a fundamental safety standard for non-electric refrigerant-containing components used in refrigeration and HVAC systems. By establishing rigorous testing and construction requirements, this standard helps manufacturers produce safer and more reliable components, while giving contractors, regulators, and end-users greater confidence in system performance.

As cooling technologies continue to evolve, the UL 207 standard remains a fundamental framework for ensuring that critical HVAC components meet modern safety expectations and industry demands.

For many years, our organization, with its competent and experienced team, has been understanding the needs of its clients, providing the advanced testing services they require, and assisting them in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services compliant with the UL 207 standard.