ISO 15042:2017/Amd 1:2020

Overview

ISO 15042:2017/Amd 1:2020 is an important amendment to the internationally recognized standard for multiple split-system air conditioners and air-to-air heat pumps. This amendment specifically addresses testing and rating methodologies for evaluating the performance of these HVAC (Heating, Ventilation, and Air Conditioning) systems. Maintained by ISO Technical Committee ISO/TC 86 and its Subcommittee SC 6, this document ensures consistent and reliable performance metrics that manufacturers and testing laboratories can apply globally.

The 2020 amendment enhances the original 2017 standard by clarifying variations allowed during steady-state cooling and heating capacity tests, especially when using the indoor air enthalpy method. This update supports more precise measurements and uniformity in testing conditions, which are crucial to maintaining product quality and consumer trust.

Key Topics

• Performance Testing Methods: The amendment refines procedures for measuring the cooling and heating capacities of multiple split-system air conditioners and air-to-air heat pumps under standardized test conditions.
• Steady-State Test Variations: Detailed permissible variation limits for external static pressure (ESP) during tests are specified, distinguishing between differences at or below 100 Pa and above 100 Pa.
• Indoor Air Enthalpy Method: Special focus on the indoor air enthalpy method, which is used to calculate thermal performance, with updated guidelines on acceptable variations during testing.
• Static Pressure Measurement: The amendment defines static pressure measurement as an arithmetical mean within the first five minutes of data collection, emphasizing precise data handling.
• Standardization Compliance: Aligns with ISO/IEC Directives for international standard development and maintenance, maintaining consistency with worldwide regulatory frameworks.

Applications

The amendment to ISO 15042:2017 provides practical value for manufacturers, testing laboratories, regulatory agencies, and HVAC system designers by:

• Ensuring Product Quality: Manufacturers can demonstrate compliance with uniform performance benchmarks, supporting product certification and market acceptance in various countries.
• Testing Accuracy: Laboratories benefit from clear guidance on test condition variations, improving precision and repeatability of performance measurements.
• Regulatory Alignment: Helps national and international authorities enforce minimum efficiency standards and safety requirements for multi-split air conditioners and heat pumps.
• Energy Efficiency Programs: Facilitates energy rating schemes and eco-labeling by providing accepted protocols for performance evaluations.
• Consumer Confidence: Standardized rating systems enable end-users to make informed decisions based on verified cooling and heating capacities.

Related Standards

• ISO 5151: Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors - Testing and rating at part load conditions and calculation of seasonal performance.
• ISO 13253: Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors - Testing and rating at full load conditions and calculation of seasonal performance.
• ISO 817: Refrigerants - Designation and safety classification, relevant for refrigerant handling in air-conditioning systems.
• IEC 61892: Electrical installations in mobile and fixed offshore units, applicable for HVAC electrical safety aspects.

This amendment to ISO 15042 supports globally harmonized testing practices for multiple split-system air conditioners and air-to-air heat pumps. Implementing its requirements ensures accuracy in performance ratings, promotes sustainable energy use, and fosters international trade in HVAC equipment. For more details or regulatory application, consult the full ISO publication at www.iso.org.