GB/T 18837-2026 Multi-split air-conditioning (heat pump) units English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
CCS
National Standard of the People's Republic of China
GB/T 18837-2026
Flat glass container
平板玻璃集装器具
Issue date: 2026-04-30 Implementation date: 2026-10-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Symbols
5 Type and Basic Parameters
6 Technical Requirements
7 Test Methods
8 Inspection Rules
9 Marking, Packaging, Transport and Storage
Annex A (Normative) Test and Calculation of Seasonal Energy Consumption Efficiency for Air Cooled Units
Annex B (Informative) Test Method for Performance Correction Parameters of Long Piping for Units
Annex C (Normative) Test Method for Control Logic Verification (CVP) of Air Cooled Units
Annex D (Informative) Calibration Test Method for Nominal Cooling Capacity of Indoor Units
Annex E (Normative) Test and Calculation of Integrated Part Load Value for Water Cooled Units
Annex F (Normative) Test and Calculation of Heat Recovery Mode Energy Efficiency Ratio for Heat Recovery Units
Figure 1 — Schematic diagram of airflow and external static pressure measurement for multiple ducted indoor units with the same housing and air outlet dimensions
Figure 2 — Schematic diagram of airflow and external static pressure measurement for multiple ducted indoor units with different housing and air outlet dimensions
Figure 3 — Schematic diagram of airflow and external static pressure measurement for multiple direct blow indoor units
Figure 4 — Connection of outdoor unit with indoor units (and hot water module) using a single distributor
Figure 5 — Connection of outdoor unit with indoor units (and hot water module) using multiple distributors (Method 1)
Figure 6 — Connection of outdoor unit with indoor units (and hot water module) using multiple distributors (Method 2)
Figure 7 — Direct connection of outdoor unit with indoor units (and hot water module)
Figure 8 — Noise measurement point positions for a hot water module
Figure 9 — Noise measurement point positions for an expansion valve assembly
Figure A.1 — Relationship between building cooling load, unit cooling capacity and cooling power input (fixed capacity type)
Figure A.2 — Relationship between building cooling load, unit cooling capacity and cooling energy efficiency ratio (variable capacity type)
Figure A.3 — Relationship between building heating load, unit heating capacity and heating power input (fixed capacity type)
Figure A.4 — Relationship between building heating load, unit heating capacity and heating coefficient of performance (variable capacity type)
Figure B.1 — Correction factor diagram for performance parameters as a function of connecting pipe length
Figure C.1 — Control logic verification test procedure
Figure F.1 — Connection of a single heat recovery module with indoor units
Figure F.2 — Connection of a single heat recovery module with multiple indoor units
Figure F.3 — Connection of a single heat recovery module with a single indoor unit
Table 1 — Symbol comparison table
Table 2 — Nominal conditions for air cooled units
Table 3 — Nominal conditions for water cooled units
Table 4 — Other test conditions
Table 5 — Minimum external static pressure limits for ducted indoor units
Table 6 — Unit coefficient of performance limits
Table 7 — Noise limits for indoor units (sound pressure level)
Table 8 — Noise limits for independent hot water modules with built in pump (sound pressure level)
Table 9 — Noise limits for outdoor units (sound pressure level)
Table 10 — Number and type of indoor units connected
Table 11 — Connecting pipe length between outdoor and indoor units
Table 12 — Test condition tolerances (average variation)
Table 13 — Test condition tolerances (maximum variation)
Table 14 — Tolerances for defrosting process readings
Table 15 — Inspection items
Table 16 — Nameplate content
Table A.1 — Test conditions for seasonal energy consumption efficiency of air cooled units
Table A.2 — Outdoor temperatures corresponding to zero building load for units with CCO ≤ 20 000 W
Table A.3 — Occurrence time of temperatures requiring cooling during the cooling season for units with CCO ≤ 20 000 W
Table A.4 — Occurrence time of temperatures requiring heating during the heating season for units with CCO ≤ 20 000 W
Table A.5 — Performance parameters under various test conditions for cooling tests
Table A.6 — Performance parameters under various test conditions for heating tests
Table B.1 — Equivalent length of elbows
Table C.1 — Tolerances for control logic verification test readings
Table C.2 — Control logic verification test conditions
Table D.1 — Calibration test conditions for the cooling capacity of dedicated outdoor air system indoor units
Multi split air conditioning (heat pump) units
1 Scope
This document specifies the terms and definitions, symbols, type and basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transport and storage for multi split air conditioning (heat pump) units (hereinafter referred to as “units”).
This document applies to multi split air conditioning (heat pump) units supplied by AC power and DC power.
2 Normative References
The following documents are essential for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 191 Packaging — Pictorial marking for handling of goods
GB/T 2423.17 Environmental testing — Part 2: Test methods — Test Ka: Salt mist
GB/T 2828.1 Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot by lot inspection
GB/T 4706.32-2024 Safety of household and similar electrical appliances — Part 32: Particular requirements for heat pumps, air conditioners and dehumidifiers
GB/T 6388 Transport packaging — Shipping marks
GB/T 9237 Refrigerating systems and heat pumps — Safety and environmental requirements
GB/T 9286-2021 Paints and varnishes — Cross cut test
GB/T 10870-2014 Performance test method for water chilling (heat pump) packages using the vapor compression cycle
GB/T 13306 Nameplates
GB/T 17758-2023 Unitary air conditioners
GB/T 18430.1-2024 Water chilling (heat pump) packages using the vapor compression cycle — Part 1: Water chilling (heat pump) packages for industrial, commercial and similar applications
GB 25130 Unitary air conditioners — Safety requirements
JB/T 7249 Refrigeration and air conditioning equipment — Terminology
JB/T 11966 Multi split air conditioning (heat pump) unit for heating and hot water supply
JB/T 14064 Photovoltaic driven multi split air conditioning (heat pump) system
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 17758, JB/T 7249 and the following apply.
3.1 multi split air conditioning (heat pump) units
An air conditioning (heat pump) unit consisting of a single refrigeration cycle system in which one or several outdoor units can be connected to several direct expansion indoor terminals of different types or capacities.
3.2 heat recovery multi split air conditioning (heat pump) units
Multi split air conditioning (heat pump) units that have the capability for some indoor units to operate in cooling mode while others operate simultaneously in heating mode.
NOTE: Hereinafter referred to as “heat recovery units”.
3.3 hot water module
A component that produces hot water by heat exchange between refrigerant and water, used to supply heat to one or more areas.
NOTE: The hot water module may be independently installed or integrated into the outdoor unit of a multi split air conditioning (heat pump) unit.
3.4 cooling (heating) capacity of indoor unit; CCI/HCI
Under specified test conditions, the quantity of heat removed from (or supplied to) an indoor space per unit time by a single indoor unit.
NOTE: Expressed in watts (W).
3.5 sensible capacity ratio
Under specified cooling capacity test conditions, the ratio of the sensible cooling capacity of the indoor unit to its cooling capacity.
NOTE: Declared to the nearest 0.01.
3.6 connection ratio
When an outdoor unit is combined with indoor units, the ratio of the sum of the declared nominal cooling capacities of the indoor units to the sum of the declared nominal cooling capacities of the outdoor unit.
When an outdoor unit is combined with hot water modules, the ratio of the sum of the declared nominal radiant heating capacities of the hot water modules to the sum of the declared nominal radiant heating capacities of the outdoor unit.
NOTE: Expressed as a percentage (%).
3.7 integrated part load value; IPLV
A part load efficiency index for water cooled multi split air conditioning (heat pump) units, expressed as a single numerical value, calculated based on the EER at various part loads under the specified IPLV conditions, weighted by the operating time factors at each load.
NOTE 1: Calculated and tested according to Annex C of GB/T 17758-2023, based on the energy efficiency ratio (EER) at each part load of the unit under the IPLV conditions specified in Table 2 of GB/T 17758-2023.
NOTE 2: Expressed in watts per watt (W/W), rounded to two decimal places.
3.8 seasonal energy efficiency ratio; SEER
The ratio of the total heat removed from an indoor space during the cooling season to the total electrical energy consumed by the unit when operating in cooling mode under specified conditions.
NOTE: Expressed in watt hours per watt hour [W·h/(W·h)], rounded to two decimal places.
3.9 heating seasonal performance factor; HSPF
The ratio of the total heat supplied to an indoor space during the heating season to the total electrical energy consumed by the unit when operating in heating mode under specified conditions.
NOTE: Expressed in watt hours per watt hour [W·h/(W·h)], rounded to two decimal places.
3.10 annual performance factor; APF
The ratio of the sum of heat removed from and heat supplied to an indoor space during the cooling and heating seasons to the total electrical energy consumed by the unit over the same period when operating in cooling and heating modes under specified conditions.
NOTE 1: Expressed in watt hours per watt hour [W·h/(W·h)], rounded to two decimal places.
NOTE 2: The annual performance factor for heating using radiant heating is denoted as APFᴴ.
3.11 radiant heating
Heating provided by the unit using a hot water module to produce hot water, which circulates through pipes and provides heat primarily through floor radiation.
3.12 heating capacity by radiant heating; qᴴ
Under specified test conditions, the quantity of heat supplied per unit time to an enclosed space, room or area when the unit is operating in radiant heating mode.
NOTE: Expressed in watts (W).
3.13 power input by radiant heating; Wᴴ
Under specified test conditions, the total power input consumed per unit time when the unit is operating in radiant heating mode.
Standard
GB/T 18837-2026 Multi-split air-conditioning (heat pump) units (English Version)
GB/T 18837-2026 Multi-split air-conditioning (heat pump) units English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
CCS
National Standard of the People's Republic of China
GB/T 18837-2026
Flat glass container
平板玻璃集装器具
Issue date: 2026-04-30 Implementation date: 2026-10-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Symbols
5 Type and Basic Parameters
6 Technical Requirements
7 Test Methods
8 Inspection Rules
9 Marking, Packaging, Transport and Storage
Annex A (Normative) Test and Calculation of Seasonal Energy Consumption Efficiency for Air Cooled Units
Annex B (Informative) Test Method for Performance Correction Parameters of Long Piping for Units
Annex C (Normative) Test Method for Control Logic Verification (CVP) of Air Cooled Units
Annex D (Informative) Calibration Test Method for Nominal Cooling Capacity of Indoor Units
Annex E (Normative) Test and Calculation of Integrated Part Load Value for Water Cooled Units
Annex F (Normative) Test and Calculation of Heat Recovery Mode Energy Efficiency Ratio for Heat Recovery Units
Figure 1 — Schematic diagram of airflow and external static pressure measurement for multiple ducted indoor units with the same housing and air outlet dimensions
Figure 2 — Schematic diagram of airflow and external static pressure measurement for multiple ducted indoor units with different housing and air outlet dimensions
Figure 3 — Schematic diagram of airflow and external static pressure measurement for multiple direct blow indoor units
Figure 4 — Connection of outdoor unit with indoor units (and hot water module) using a single distributor
Figure 5 — Connection of outdoor unit with indoor units (and hot water module) using multiple distributors (Method 1)
Figure 6 — Connection of outdoor unit with indoor units (and hot water module) using multiple distributors (Method 2)
Figure 7 — Direct connection of outdoor unit with indoor units (and hot water module)
Figure 8 — Noise measurement point positions for a hot water module
Figure 9 — Noise measurement point positions for an expansion valve assembly
Figure A.1 — Relationship between building cooling load, unit cooling capacity and cooling power input (fixed capacity type)
Figure A.2 — Relationship between building cooling load, unit cooling capacity and cooling energy efficiency ratio (variable capacity type)
Figure A.3 — Relationship between building heating load, unit heating capacity and heating power input (fixed capacity type)
Figure A.4 — Relationship between building heating load, unit heating capacity and heating coefficient of performance (variable capacity type)
Figure B.1 — Correction factor diagram for performance parameters as a function of connecting pipe length
Figure C.1 — Control logic verification test procedure
Figure F.1 — Connection of a single heat recovery module with indoor units
Figure F.2 — Connection of a single heat recovery module with multiple indoor units
Figure F.3 — Connection of a single heat recovery module with a single indoor unit
Table 1 — Symbol comparison table
Table 2 — Nominal conditions for air cooled units
Table 3 — Nominal conditions for water cooled units
Table 4 — Other test conditions
Table 5 — Minimum external static pressure limits for ducted indoor units
Table 6 — Unit coefficient of performance limits
Table 7 — Noise limits for indoor units (sound pressure level)
Table 8 — Noise limits for independent hot water modules with built in pump (sound pressure level)
Table 9 — Noise limits for outdoor units (sound pressure level)
Table 10 — Number and type of indoor units connected
Table 11 — Connecting pipe length between outdoor and indoor units
Table 12 — Test condition tolerances (average variation)
Table 13 — Test condition tolerances (maximum variation)
Table 14 — Tolerances for defrosting process readings
Table 15 — Inspection items
Table 16 — Nameplate content
Table A.1 — Test conditions for seasonal energy consumption efficiency of air cooled units
Table A.2 — Outdoor temperatures corresponding to zero building load for units with CCO ≤ 20 000 W
Table A.3 — Occurrence time of temperatures requiring cooling during the cooling season for units with CCO ≤ 20 000 W
Table A.4 — Occurrence time of temperatures requiring heating during the heating season for units with CCO ≤ 20 000 W
Table A.5 — Performance parameters under various test conditions for cooling tests
Table A.6 — Performance parameters under various test conditions for heating tests
Table B.1 — Equivalent length of elbows
Table C.1 — Tolerances for control logic verification test readings
Table C.2 — Control logic verification test conditions
Table D.1 — Calibration test conditions for the cooling capacity of dedicated outdoor air system indoor units
Multi split air conditioning (heat pump) units
1 Scope
This document specifies the terms and definitions, symbols, type and basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transport and storage for multi split air conditioning (heat pump) units (hereinafter referred to as “units”).
This document applies to multi split air conditioning (heat pump) units supplied by AC power and DC power.
2 Normative References
The following documents are essential for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 191 Packaging — Pictorial marking for handling of goods
GB/T 2423.17 Environmental testing — Part 2: Test methods — Test Ka: Salt mist
GB/T 2828.1 Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot by lot inspection
GB/T 4706.32-2024 Safety of household and similar electrical appliances — Part 32: Particular requirements for heat pumps, air conditioners and dehumidifiers
GB/T 6388 Transport packaging — Shipping marks
GB/T 9237 Refrigerating systems and heat pumps — Safety and environmental requirements
GB/T 9286-2021 Paints and varnishes — Cross cut test
GB/T 10870-2014 Performance test method for water chilling (heat pump) packages using the vapor compression cycle
GB/T 13306 Nameplates
GB/T 17758-2023 Unitary air conditioners
GB/T 18430.1-2024 Water chilling (heat pump) packages using the vapor compression cycle — Part 1: Water chilling (heat pump) packages for industrial, commercial and similar applications
GB 25130 Unitary air conditioners — Safety requirements
JB/T 7249 Refrigeration and air conditioning equipment — Terminology
JB/T 11966 Multi split air conditioning (heat pump) unit for heating and hot water supply
JB/T 14064 Photovoltaic driven multi split air conditioning (heat pump) system
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 17758, JB/T 7249 and the following apply.
3.1 multi split air conditioning (heat pump) units
An air conditioning (heat pump) unit consisting of a single refrigeration cycle system in which one or several outdoor units can be connected to several direct expansion indoor terminals of different types or capacities.
3.2 heat recovery multi split air conditioning (heat pump) units
Multi split air conditioning (heat pump) units that have the capability for some indoor units to operate in cooling mode while others operate simultaneously in heating mode.
NOTE: Hereinafter referred to as “heat recovery units”.
3.3 hot water module
A component that produces hot water by heat exchange between refrigerant and water, used to supply heat to one or more areas.
NOTE: The hot water module may be independently installed or integrated into the outdoor unit of a multi split air conditioning (heat pump) unit.
3.4 cooling (heating) capacity of indoor unit; CCI/HCI
Under specified test conditions, the quantity of heat removed from (or supplied to) an indoor space per unit time by a single indoor unit.
NOTE: Expressed in watts (W).
3.5 sensible capacity ratio
Under specified cooling capacity test conditions, the ratio of the sensible cooling capacity of the indoor unit to its cooling capacity.
NOTE: Declared to the nearest 0.01.
3.6 connection ratio
When an outdoor unit is combined with indoor units, the ratio of the sum of the declared nominal cooling capacities of the indoor units to the sum of the declared nominal cooling capacities of the outdoor unit.
When an outdoor unit is combined with hot water modules, the ratio of the sum of the declared nominal radiant heating capacities of the hot water modules to the sum of the declared nominal radiant heating capacities of the outdoor unit.
NOTE: Expressed as a percentage (%).
3.7 integrated part load value; IPLV
A part load efficiency index for water cooled multi split air conditioning (heat pump) units, expressed as a single numerical value, calculated based on the EER at various part loads under the specified IPLV conditions, weighted by the operating time factors at each load.
NOTE 1: Calculated and tested according to Annex C of GB/T 17758-2023, based on the energy efficiency ratio (EER) at each part load of the unit under the IPLV conditions specified in Table 2 of GB/T 17758-2023.
NOTE 2: Expressed in watts per watt (W/W), rounded to two decimal places.
3.8 seasonal energy efficiency ratio; SEER
The ratio of the total heat removed from an indoor space during the cooling season to the total electrical energy consumed by the unit when operating in cooling mode under specified conditions.
NOTE: Expressed in watt hours per watt hour [W·h/(W·h)], rounded to two decimal places.
3.9 heating seasonal performance factor; HSPF
The ratio of the total heat supplied to an indoor space during the heating season to the total electrical energy consumed by the unit when operating in heating mode under specified conditions.
NOTE: Expressed in watt hours per watt hour [W·h/(W·h)], rounded to two decimal places.
3.10 annual performance factor; APF
The ratio of the sum of heat removed from and heat supplied to an indoor space during the cooling and heating seasons to the total electrical energy consumed by the unit over the same period when operating in cooling and heating modes under specified conditions.
NOTE 1: Expressed in watt hours per watt hour [W·h/(W·h)], rounded to two decimal places.
NOTE 2: The annual performance factor for heating using radiant heating is denoted as APFᴴ.
3.11 radiant heating
Heating provided by the unit using a hot water module to produce hot water, which circulates through pipes and provides heat primarily through floor radiation.
3.12 heating capacity by radiant heating; qᴴ
Under specified test conditions, the quantity of heat supplied per unit time to an enclosed space, room or area when the unit is operating in radiant heating mode.
NOTE: Expressed in watts (W).
3.13 power input by radiant heating; Wᴴ
Under specified test conditions, the total power input consumed per unit time when the unit is operating in radiant heating mode.
