ISO 5151:2017/Amd 1:2020

Overview

ISO 5151:2017/Amd 1:2020 is an important amendment to the international standard ISO 5151, which establishes testing and rating methods for the performance of non-ducted air conditioners and heat pumps. Developed by ISO Technical Committee ISO/TC 86, Subcommittee SC 6, this amendment updates key test procedures to ensure more accurate and consistent measurement of equipment efficiency and capacity. The standard is widely referenced by manufacturers, testing laboratories, and regulatory bodies to maintain quality and performance benchmarks in refrigeration and air conditioning systems.

Key Topics

• Performance Testing Protocols
  The amendment revises data recording requirements during indoor air enthalpy capacity tests, enhancing the precision of performance evaluations. Key parameters such as power input, voltage, current, temperature (dry-bulb and wet-bulb), airflow resistance, and refrigerant charge are clearly defined for recording to ensure consistency across tests.

• Data Accuracy and Variations
  Updated tolerances for steady-state cooling and heating capacity tests specify allowable variations in external static pressure and measurement tolerances when using indoor air enthalpy methods. These limits help maintain test reliability while accommodating practical operational differences.

• Enhanced Measurement Parameters
  The amendment introduces detailed tables that replace previous versions, providing a more robust framework for cataloging test data. This includes factors such as fan speed settings, compressor operation states, outdoor air conditions, and energy input during defrost cycles.

Applications

• Manufacturing Quality Control
  Manufacturers of non-ducted air conditioners and heat pumps use ISO 5151 testing guidelines to validate product performance under standardized conditions. This ensures units meet declared specifications before market release.

• Regulatory Compliance
  The amendment supports national and international regulatory frameworks by providing standardized performance rating methods, facilitating fair market competition and consumer protection.

• Performance Certification
  Testing laboratories rely on the updated amendment for certifying equipment efficiency ratings, enabling consumers and industry stakeholders to make informed decisions based on verified performance data.

• Product Development and R&D
  Engineers and developers utilize the refined testing methods to benchmark new technologies and optimize design parameters for enhanced energy efficiency and environmental compliance.

Related Standards

• ISO 5151:2017 – The base standard describing testing and rating methodologies for non-ducted air conditioners and heat pumps.
• ISO/IEC Directives, Part 1 and Part 2 – Governing the editorial and approval processes for ISO standards, ensuring consistency and transparency in document development.
• IEC Standards on Electrical Testing – Often used in conjunction with ISO 5151 for components’ electrical performance verification in HVAC&R equipment.
• Energy Efficiency Labeling Standards – Related national or regional standards guided by ISO 5151 performance metrics to establish energy labeling schemes.

Keywords: ISO 5151:2017/Amd 1:2020, non-ducted air conditioners, heat pumps, performance testing, rating standards, air enthalpy method, HVAC testing, refrigeration standards, energy efficiency testing, ISO TC 86.