GB/T 20738-2018Rooftop air conditioning unit (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 20738-2006 "Roof-type air conditioning unit". Compared with GB/T 20738-2006, except for editorial repair The main technical changes changed are as follows.

--- Increased the "cooling integrated partial load performance coefficient", "cooling season energy efficiency ratio", "year-round performance coefficient" and "cooling energy efficiency ratio" Religious requirements (see Chapter 3 and 5.3.17);

--- Added the classification of "air conditioning capacity adjustment characteristics (constant volume, non-constant type)" (see 4.1.3);

--- Revised the model preparation requirements, canceled Appendix A "Modeling method for roof type air conditioning unit" (see 4.2, 2006 version 4.2);

---Modified the normal working conditions and working parameters of the air conditioner (see 4.3, 4.3 of the 2006 edition);

--- Removed the salt spray resistance of the plated parts and the adhesion requirements and test of the paint layer (see 5.1.13, 5.1.14, 6.3 of the 2006 edition). 21.6.3.22);

---Modified the safety requirements of air conditioners and adjusted the normative references (see 5.2, 5.3 of 2006 edition);

--- Increased the noise requirement "the measured value should not be greater than the explicit value of 3dB (A)" (see 5.3.19);

--- Increased the "water side pressure loss" requirements of air conditioners (see 5.3.20);

--- Increased the air conditioning machine performance test power consumption correction requirements, the correction method is quoted from GB/T 18836-2017 (see Table 6);

--- Increased requirements for the use of flammable refrigerants (see Chapter 8).

1 Scope

This standard specifies the terms and definitions, types and bases of roof-mounted air conditioning units (hereinafter referred to as "air conditioners") driven by electric motors. This parameter, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage.

This standard applies to roof-mounted air conditioning units with centralized air supply.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 191 packaging storage and transportation icon

GB 2894-2008 Safety signs and guidelines for their use

GB 4706.32-2012 Safety requirements for heat pumps, air conditioners and dehumidifiers for household and similar electrical appliances

GB/T 6388 transport packaging receipt and delivery mark

GB/T 9237 refrigeration system and heat pump safety and environmental requirements

GB/T 10870-2014 Vapor compression cycle cold water (heat pump) unit performance test method

GB/T 13306 signage

GB/T 14294-2008 modular air conditioning unit

GB/T 17758-2010 unit air conditioner

GB/T 18430.1-2007 Vapor compression cycle cold water (heat pump) units - Part 1. Cold, industrial or commercial Water (heat pump) unit

GB/T 18836-2017 air duct air supply (heat pump) unit

GB 19576 unit air conditioner energy efficiency limit value and energy efficiency grade

GB 25130 unit air conditioner safety requirements

JB/T 4330-1999 Determination of noise in refrigeration and air conditioning equipment

JB/T 7249 refrigeration equipment terminology

3 Terms and definitions

The following terms and definitions defined by JB/T 7249 and GB/T 17758-2010 apply to this document.