GB/T 7725-2022 PDF English
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GB/T 7725-2022: PDF in English (GBT 7725-2022) GB/T 7725-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.140.30
CCS Y 61
Replacing GB/T 7725-2004
Room air conditioner
房间空气调节器
(ISO 5151:2017, Non-ducted air conditioners and heat pumps - Testing
and rating for performance, NEQ)
ISSUED ON: OCTOBER 12, 2022
IMPLEMENTED ON: MAY 01, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions, symbols ... 7
4 Product classification ... 24
5 Technical requirements ... 27
6 Tests ... 33
7 Inspection rules ... 51
8 Marks, packaging, transportation and storage ... 56
Annex A (normative) Multi-split room air conditioners ... 60
Annex B (normative) Calculation of seasonal energy consumption efficiency of room
air conditioners ... 66
Annex C (informative) Occurrence time of each temperature calculated based on the
meteorological data of a typical city (taking Nanjing as an example) ... 95
Annex D (normative) Tests and calculation methods for cooling capacity and heating
capacity ... 97
Annex E (informative) Measuring instruments ... 120
Annex F (informative) Air volume measurement ... 123
Annex G (informative) Cooling condensed water measurement ... 130
Annex H (informative) Diagram of heating capacity test procedure in D.4 ... 131
Annex I (normative) Measurement of noise ... 136
Annex J (normative) Standby power test ... 143
Annex K (informative) Grading of some performances ... 144
Annex L (informative) Test method for temperature control fluctuation ... 147
Annex M (informative) Refrigerant enthalpy method ... 149
Annex N (informative) Enthalpy method of outdoor side air ... 152
Annex O (informative) Verification test method for indoor side calorimeters ... 156
Annex P (informative) Verification test method for outdoor side calorimeters ... 158
Annex Q (informative) Verification test method for balance calorimeter ... 160
Bibliography ... 161
Room air conditioner
1 Scope
This document specifies the terms and definitions, product classification, technical
requirements, tests, inspection rules, marks, packaging, transportation and storage for
room air conditioners.
This document applies to household and similar free-supply room air conditioners
(hereinafter referred to as air conditioners) that use air-cooled or water-cooled
condensers, fully enclosed motor-compressors, and whose rated cooling capacity is
below 14000W for the purpose of creating a comfortable indoor environment), as well
as ducted air conditioners whose rated cooling capacity is less than 8kW and external
static pressure is less than 25Pa.
This document does not apply to the following products and systems:
- portable air conditioners;
- individual components that cannot form a complete cooling system;
- air conditioners using absorption cooling cycle;
- other ducted air conditioners.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 191, Packaging and storage marks
GB/T 1766, Paints and varnishes - Rating schemes of degradation of coats (ISO
4628:2003, NEQ)
GB/T 2423.3, Environmental testing - Part 2: Testing method - Test Cab: Damp heat,
steady state (GB/T 2423.3-2016, IEC 60068-2-78:2012, IDT)
GB/T 2423.17, Environmental testing for electric and electronic products - Part 2:
Test method - Test Ka: Salt mist (GB/T 2423.17-2008, IEC 60068-2-11:1981, IDT)
GB/T 2828.1, Sampling procedures for inspection by attributes - Part 1: Sampling
3.1.2 heat pump
A cooling system that heats up the indoor air by converting the flow direction of the
refrigerant in the cooling system, absorbing heat from the low temperature outdoor air
and releasing heat to the room.
NOTE: Air conditioners with heat pump heating capabilities are called heat pump air conditioners.
3.1.3 supplementary electrical heating devices
An electric heating device used with a heat pump for heating.
3.1.4 cooling capacity
The sum of the heat removed from the room per unit time when the air conditioner is
in cooling operation under any given working conditions and conditions.
NOTE: The unit is watts (W). The rated value of cooling capacity includes rated cooling capacity,
rated intermediate cooling capacity, rated maximum cooling capacity and rated minimum cooling
capacity. Among them, the rated intermediate cooling capacity is within the range of 50% of the
rated cooling capacity ± 100W.
3.1.5 cooling power input
The power consumed by the air conditioner during the cooling capacity test.
NOTE: The unit is watts (W). The rated value of cooling power input includes rated cooling power
input and rated intermediate cooling power input.
3.1.6 heating capacity
When the air conditioner is in heating operation under any given working conditions
and conditions, the sum of the heat sent into the room per unit time.
NOTE 1: The unit is watts (W). The rated value of heating capacity includes rated heating capacity,
rated intermediate heating capacity, rated maximum heating capacity, rated minimum heating
capacity and rated low temperature heating capacity. Among them, the rated intermediate heating
capacity is within the range of 50% of the rated heating capacity ±100W.
NOTE 2: The heating capacity is only the heating capacity of the heat pump, not including the
heating capacity of the supplementary electric heating device.
3.1.7 heating power input
The power consumed by the air conditioner during the heating capacity test.
NOTE: The unit is watts (W). The rated value of heating power input includes rated heating power
input, rated intermediate heating power input and rated low temperature heating power input.
3.1.8 effective power input
The average electric power input into the air conditioner within the specified time,
including:
a) the power input at which the compressor operates;
b) the power input of the electric heating device used only for defrosting;
c) the power input to all control and safety devices;
d) the power input to heat exchange conveyors (fans, pumps, etc.).
NOTE: The unit is watts (W). The power input of the supplementary heating device is not included.
3.1.9 energy efficiency ratio; EER
Under any given working condition and specified conditions, when the air conditioner
is in cooling operation, the ratio of cooling capacity to effective power input.
NOTE: The unit is watts per watt (W/W).
3.1.10 coefficient of performance; COP
Under any given working condition and specified conditions, when the air conditioner
is in heating operation, the ratio of the heating capacity to the effective power input.
NOTE: The unit is watts per watt (W/W).
3.1.11 standard air
Dry air at 20°C and at a standard barometric pressure of 101.325 kPa, having a mass
density of 1.204 kg/m3.
3.1.12 indoor discharge air-flow
The air volume sent by the indoor unit of the air conditioner to the room or air supply
area per unit time when the ventilation and exhaust doors of the air conditioner for the
exchange of indoor and outdoor air are completely closed (if any) and operated under
specified conditions.
NOTE: The unit is cubic meter per second (m3/s) or cubic meter per hour (m3/h).
3.1.13 room-type calorimeter
A test device consisting of two adjacent rooms with a partition wall in between. One
room is used as interior. The other room is used exterior. Each room is air-conditioned.
Its cooling, heating and water volume can be measured and controlled. They are used
to balance the cooling capacity and dehumidification capacity of the air conditioner
NOTE: When running at full load, all indoor units and compressors work, unless the indoor units
and compressors are controlled by the automatic controller of the air conditioner.
3.1.22 multi-split room air conditioner
A device that supplies conditioned air to multiple rooms.
NOTE: It is mainly composed of one outdoor unit connected to more than one indoor unit, which
can realize the combined system of multiple indoor units working at the same time, some indoor
units working at the same time or a single indoor unit working. Hereinafter it is referred to as "multi-
split air conditioner".
3.1.23 standby mode
When the air conditioner is connected to the mains power supply, one or more of the
following user-oriented functions or protection functions are provided, and any product
mode is continuous:
- other modes can be triggered by triggering remote switches (including remote
control), internal sensors, timers;
- information or status display including a clock;
- sensor-based functionality.
NOTE: In this mode, protective devices such as crankcase heaters do not work.
3.1.24 cooling load factor; CLF
During the cooling operation of the air conditioner, when the air conditioner is
intermittently operated by turning on (ON) and off (OFF) the indoor temperature
regulator, within one cycle of intermittent operation consisting of ON time and OFF
time, the ratio of the heat removed from the room to the heat removed from the room
during continuous cooling operation during this cycle time.
3.1.25 heating load factor; HLF
During the heating operation of the air conditioner, when the air conditioner is
intermittently operated by turning on (ON) and off (OFF) the indoor temperature
regulator, within one cycle of intermittent operation consisting of ON time and OFF
time, the ratio of the heat delivered to the room to the heat delivered to the room in
continuous heating operation during this cycle time.
3.1.26 part load factor; PLF
Under the same temperature and humidity conditions, the ratio of the energy
consumption efficiency of the air conditioner during intermittent operation to the energy
consumption efficiency of continuous operation.
3.1.27 degradation coefficient; CD
The coefficient by which the efficiency of the air conditioner decreases due to
intermittent operation.
3.1.28 seasonal energy efficiency ratio; SEER
During the cooling season, the ratio of the sum of the heat removed from the room to
the sum of the electricity consumed by the air conditioner during cooling operation.
3.1.29 heating seasonal performance factor; HSPF
During the heating season, when the air conditioner is in heating operation, the ratio of
the sum of the heat sent into the room to the sum of the electricity consumed.
3.1.30 annual performance factor; APF
During the cooling season and heating season of the air conditioner, the ratio of the sum
of the cold removed from the indoor air and the heat sent into the room to the sum of
the electricity consumed during the same period.
3.1.31 cooling seasonal total energy; CSTE
During the cooling season, the total amount of electricity consumed by the air
conditioner during cooling operation.
NOTE: The unit is watt-hour (W·h).
3.1.32 heating seasonal total energy; HSTE
During the heating season, the total amount of electricity consumed by the air
conditioner during heating operation.
NOTE: The unit is watt-hour (W·h).
3.1.33 annual power consumption; APC
The sum of the cooling seasonal total energy in the cooling season and the heating
seasonal total energy in the heating season.
NOTE: The unit is watt-hour (W·h).
3.1.34 cooling load
The cooling capacity when the outdoor temperature is 35°C is taken as the cooling
building load. The straight line connecting this point with 23°C (0 load point) is the
cooling load line. The intersection of the vertical line at the overtemperature point and
the cooling load line is called as cooling load.
5.2.2.1 Rated cooling capacity
Test according to 6.3.2. The measured cooling capacity of fixed speed room air
conditioner and variable speed room air conditioner shall not be less than 95% of the
rated cooling capacity.
5.2.2.2 Rated intermediate cooling capacity
Test according to 6.3.2. The measured intermediate cooling capacity of variable speed
air conditioners shall not be less than 95% of the rated intermediate cooling capacity.
5.2.2.3 Rated minimum cooling capacity
Test according to 6.3.2. When the indicated value of the minimum cooling capacity is
less than 1 kW, the measured minimum cooling capacity of the variable speed air
conditioner shall not be greater than 120% of the indicated value. When the indicated
value of the minimum cooling capacity is not less than 1 kW, the measured minimum
cooling capacity of the variable speed air conditioner shall not be greater than 105% of
the indicated value (or not greater than the indicated value + 200W, whichever is larger).
5.2.2.4 Rated maximum cooling capacity
Test according to 6.3.2. The measured maximum cooling capacity of variable speed air
conditioners shall not be less than 95% of the rated maximum cooling capacity.
5.2.3 Cooling power input
5.2.3.1 Rated cooling power input
Test according to 6.3.3. The measured cooling power input of fixed speed and variable
speed air conditioners shall not exceed 110% of the rated cooling power input. For every
300 W cooling capacity of the water-cooled air conditioner, add 10 W as the rated power
input of the cooling system water pump and cooling water tower fan.
5.2.3.2 Rated intermediate cooling power input
Test according to 6.3.3. The measured intermediate cooling power input of variable
speed air conditioners shall not be greater than 110% of the rated intermediate cooling
power input.
5.2.3.3 Rated minimum cooling power input
Test according to 6.3.3. When the indicated value of the minimum cooling power input
is less than 500 W, the measured minimum cooling power input of the variable speed
air conditioner shall not be greater than 120% of the indicated value. When the indicated
value of the minimum cooling power input is not less than 500 W, the actual measured
minimum cooling power input of the variable speed air conditioner shall not be greater
than 110% of the indicated value (or not greater than the indicated value + 100 W,
whichever is larger).
5.2.3.4 Rated maximum cooling power input
Test according to 6.3.3. The measured maximum cooling power input of variable speed
air conditioners shall not be greater than 110% of the rated maximum cooling power
input.
5.2.4 Heating capacity
5.2.4.1 Rated heating capacity
Test according to 6.3.4. The measured heating capacity of fixed speed and variable
speed air conditioners shall not be less than 95% of the rated heating capacity.
5.2.4.2 Rated intermediate heating capacity
Test according to 6.3.4. The measured intermediate heating capacity of variable speed
air conditioners shall not be less than 95% of the rated intermediate heating capacity.
5.2.4.3 Rated low temperature heating capacity
When testing according to the method in 6.3.4 and under low temperature heating
conditions, the measured low temperature heating capacity of fixed speed and variable
speed air conditioners shall not be less than 95% of the rated low temperature heating
capacity.
5.2.4.4 Rated minimum heating capacity
Test according to 6.3.4. When the indicated value of the minimum heating capacity is
less than 1 kW, the actual measured minimum heating capacity of the variable speed air
conditioner shall not be greater than 120% of the indicated value. When the indicated
value of the minimum heating capacity is not less than 1 kW, the actual measured
minimum heating capacity of the variable speed air conditioner shall not be greater than
105% of the indicated value (or not greater than the indicated value + 200W, whichever
is larger).
5.2.4.5 Rated maximum heating capacity
Test according to 6.3.4. The rated maximum heating capacity of variable speed air
conditioners shall not be less than 95% of the indicated value.
5.2.5 Heating power input
5.2.5.1 Rated heating power input
Test according to 6.3.5. The measured heating power input of the fixed speed and
variable speed air conditioners shall not be greater than 110% of the rated heating power
input.
min of starting and running. It is not allowed to operate thereafter. When the motor
overload protector does not reset within the first 5 min of operation, if it is reset
within 30 min after shutdown, it shall run continuously for 1 h.
5.2.8 Minimum operating cooling and freezing
The requirements for testing according to the test method in 6.3.8 are as follows:
a) The parts of the air conditioner shall not be deformed or damaged to affect the
normal operation of the air conditioner.
b) The area of frost condensed on the windward surface of the indoor evaporator
shall not be greater than 50% of the windward area of the evaporator or the air
volume drop shall not exceed 25% of the initial air volume. If the frosting area
on the windward surface of the evaporator is not easy to be seen by visual
inspection or the air volume cannot be measured, the requirements of c) shall be
met.
c) When the compressor cannot be automatically started and stopped during the test,
if the coil temperature is measured, compared with the initial temperature, the
temperature measured at the midpoint of each coil within a period of at least 20
min of operation shall not be lower than 2 K. If the suction pressure is measured,
the corresponding saturated suction temperature shall be converted. During at
least 20 min of operation, the saturated suction temperature shall not be lower
than 2 K, compared with the initial saturated suction temperature.
When the compressor can start and stop automatically during the test, if the coil
temperature is measured, during the test, compared with the initial temperature, the
temperature measured at the midpoint of the coil 10 min after the compressor starts
shall not be lower than 2 K. If the suction pressure is measured, the corresponding
saturated suction temperature shall be converted. During the test period, the saturated
suction temperature 10 min after the start of the compressor shall not be lower than 2
K, compared with the initial saturated suction temperature.
5.2.9 Freeze dripping
Test according to 6.3.9. There shall be no visible ice falling, water dripping or blowing
out at the indoor side of the air conditioner.
5.2.10 Maximum operating heating
The requirements for testing according to the test method of 6.3.10 are as follows:
a) All parts of the air conditioner shall not be deformed or damaged to affect the
normal operation of the air conditioner.
b) During the first hour of continuous operation of the air conditioner, its motor
overload protector shall not trip.
c) When the air conditioner is stopped for 3 min, it will start to run continuously for
1 h. However, the motor overload protector is allowed to trip within the first 5
min of starting and running. It is not allowed to operate thereafter. When the motor
overload protector does not reset within the first 5 min of operation, if it is reset
within 30 min after shutdown, it shall run continuously for 1 h.
5.2.11 Minimum operating heating
When the test is carried out according to 6.3.11, the safety device shall not trip off
during the 1h test run of the air conditioner.
5.2.12 Condensation and condensed water removal capacity
The requirements for testing according to 6.3.12 are as follows:
a) The condensation on the outer surface of the air conditioner shell shall not drip.
The indoor air supply shall not contain water droplets.
b) When the air conditioner adopts the method of condensed water splashing the
condenser, the condensed water shall not drip or blow out from the air conditioner.
5.2.13 Automatic defrosting
The requirements for testing according to 6.3.13 are as follows:
a) In the defrosting cycle, the duration that the air supply temperature on the indoor
side is lower than 18°C is not more than 1 min.
b) After the air conditioner is defrosted, the frost layer of the outdoor heat exchanger
shall be completely melted.
5.2.14 Noise
The requirements for testing according to 6.3.14 are as follows:
a) When the air conditioner is tested for noise in a semi-anechoic room, the noise
test value shall not be greater than the upper limit of the indicated value (indicated
value + upper deviation). The upper deviation of the manufacturer's indicated
value for air conditioner noise is +3dB(A).
b) There shall be no abnormal noise and vibration when the air conditioner is in use.
5.2.15 Seasonal energy consumption efficiency
Air-cooled air conditioners are tested according to methods in 6.3.2~6.3.5. Calculation
of seasonal energy consumption efficiency is according to Annex B. The calculated
value shall not be less than 95% of the declared value of seasonal energy consumption
efficiency of the air conditioner.
conditions, then use the temperature controller to set the outlet air temperature to the
lowest or highest temperature allowed by the air conditioner. Test under this state.
6.2.4 During the cooling capacity and heating capacity tests, the ventilation door and
exhaust door (if any), fan speed, and guide grille for exchanging indoor and outdoor air
of the air conditioner shall be set within the normal use adjustment control range
according to the manufacturer's regulations. If not specified by the manufacturer, the
ventilation door and exhaust door (if any) for exchanging indoor and outdoor air of the
air conditioner are completely closed. Fan speed, guide grills are adjusted to the position
of maximum cooling capacity or maximum heating capacity without violating the
manufacturer's regulations.
6.2.5 No changes shall be made to the air conditioner except for the connection of
devices and instruments required for the test in the prescribed manner.
6.2.6 The air conditioner fan speed and air resistance shall not be changed during the
test. The test results shall adopt the values corrected according to the standard
atmospheric pressure.
6.2.7 When using the indoor air-enthalpy test method to carry out the cooling capacity
and heating capacity tests, see the measurement method for air volume in Annex F. The
test shall be carried out under the condition that the external static pressure is 0Pa.
NOTE: Additional guidelines for air flow measurement can be found in ISO 3966 and GB/T 2624.1.
6.2.8 The installation of air conditioners shall meet the following requirements.
a) Follow the installation procedure and accessories specified by the manufacturer
for installation. If the unit has multiple installation methods, all tests shall be
carried out under the most unfavorable installation method. Requirements such
as the installation distance from the air conditioner to the wall and the size of the
protrusion through the wall shall follow the relevant recommendations of the
manufacturer.
b) For ducted air conditioners with a rated cooling capacity of less than 8kW and an
outlet static pressure of less than 25Pa, it shall be tested under the condition of
free air supply.
c) If necessary, after evacuating the refrigerant circuit of the air conditioner, charge
the refrigerant according to the refrigerant type and charge amount specified by
the manufacturer.
d) The length of the connecting pipe between the indoor unit and the outdoor unit of
the split-type air conditioner during the test shall not be less than 5 m. Or
according to the manufacturer's regulations, take the larger value. The length of
the connecting pipe is the actual length, not the equivalent length. Elbows,
pipeline branches, connection boxes or other filters used in connection operations
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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