GB/T 25127.2-2020 Low ambient temperature air source heat pump (water chilling)packages—Part 2:Heat pump (water chilling)packages for household and similar application
2020GB/T 25127.2-2020 Low ambient temperature air source heat pump (water chilling)packages—Part 2:Heat pump (water chilling)packages for household and similar application
2010GB/T 25127.2-2010 Low ambient temperature air source heat pump (water chilling) packages.Part 2:Heat pump (water chilling) packages for household and similar application