1. AHRI 210/240-2017 Performance Rating of Unitary. Air-Conditioning & Air-Source Heat Pump Equipment,2017
2. (General Administration of Quality Supervision, Inspection and Quarantine, China) GB/T 25127.1-2010, Low ambient temperature air source heat pump (water chilling) packages—Part 1,2010
3. GB/T 25127.2-2010, Low ambient temperature air source heat pump (water chilling) packages—Part 2,2010
4. GB/T 17758-2010 Unitary Air Conditioners,2010
5. GB/T 18430.1-2007 Water chilling (heat pump) packages using the vapor compression cycle - Part 1,2007