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GB 21454-2021: Minimum allowable values of the energy efficiency and energy efficiency grades for multi-connected air-condition (heat pump) units
GB 21454-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.010
CCS F 01
Replacing GB 21454-2008
Minimum Allowable Values of the Energy Efficiency and
Energy Efficiency Grades for Multi-connected Air-condition
(heat pump) Units
ISSUED ON: OCTOBER 11, 2021
IMPLEMENTED ON: NOVEMBER 1, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Energy Efficiency Grades ... 5
5 Technical Requirements ... 7
6 Test Methods ... 8
7 Implementation of the Standard ... 10
Appendix A (normative) Test and Calculation Method for Heating Seasonal
Performance Factor of Low Ambient Temperature Air Source Multi-connected Heat
Pump (air conditioning) Units ... 11
Minimum Allowable Values of the Energy Efficiency and
Energy Efficiency Grades for Multi-connected Air-condition
(heat pump) Units
1 Scope
This document specifies the energy efficiency grades, minimum allowable values of energy
efficiency and test methods for multi-connected air-condition (heat pump) units and low
ambient temperature air source multi-connected heat pump (air conditioning) units, as well as
requirements for the implementation of the Standard.
This document is applicable to multi-connected air-condition (heat pump) units (hereinafter
referred to as multi-connected units) and low ambient temperature air source multi-connected
heat pump (air conditioning) units (hereinafter referred to as low-temperature multi-connected
units) adopting air-cooled or water-cooled condensers.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 18836-2017 Ducted Air-conditioning (heat pump) Units
GB/T 18837-2015 Multi-connected Air-condition (heat pump) Unit
GB/T 25857-2010 Low Ambient Temperature Air Source Multi-connected Heat Pump (air
conditioning) Unit
3 Terms and Definitions
The terms and definitions defined in GB/T 18837-2015 and GB/T 25857-2010, and the
following terms and definitions are applicable to this document.
3.1 minimum allowable values of energy efficiency for multi-connected air-
condition (heat pump) units
Minimum allowable values of energy efficiency for multi-connected air-condition (heat pump)
units refer to the minimum allowable values of measured actual performance factor (APF),
cooling seasonal energy efficiency ratio (SEER), integrated part load value (cooling) [IPLV(C)]
or cooling energy efficiency ratio (EER) during the cooling and heating operation under the
specified operating conditions. For single-cooling products, only the SEER is assessed.
3.2 minimum allowable values of energy efficiency for low ambient temperature
air source multi-connected heat pump (air conditioning) units
Minimum allowable values of energy efficiency for low ambient temperature air source multi-
connected heat pump (air conditioning) units refer to the minimum allowable values of heating
seasonable performance factor (HSPF) and coefficient of performance (COP) of multi-
connected heat pump (air conditioning) units that adopt a motor-driven compressor and can
generate hot air at an ambient temperature not lower than 25 C during the heating operation
under the specified operating conditions.
3.3 energy efficiency ratio at the minimum-load operating conditions for multi-
connected air-condition (heat pump) units
EERmin
Energy efficiency ratio at the minimum-load operating conditions for multi-connected air-
condition (heat pump) units refer to the ratio of the cooling capacity to the total electric power
consumption of the units when turning on an indoor unit with the minimum cooling capacity
for continuous and stable cooling operation under the specified cooling capacity test conditions.
4 Energy Efficiency Grades
4.1 The energy efficiency of multi-connected units and low-temperature multi-connected units
is classified into three grades, in which, Grade-1 represents the highest energy efficiency.
4.2 The energy efficiency of air-cooled single-cooling multi-connectors is classified in
accordance with the measured SEER of the products. The measured SEER of each energy
efficiency grade shall not be less than the stipulations of Table 1.
temperature multi-connectors outdoor units with a nominal heating capacity of less than or
equal to 18,000 W, the standby power shall not be greater than 15 W (additional functions that
can be turned off during the test shall be turned off).
5.3 Products adopting electric auxiliary heating shall be able to manually turn on and off the
electric auxiliary heating system. Meanwhile, the working status of the electric auxiliary
heating system shall be indicated in an obvious position.
5.4 When the outdoor dry-bulb temperature of the multi-connectors is higher than or equal to 0
C, the electric auxiliary heating shall not be automatically turned on.
5.5 When the outdoor dry-bulb temperature of the low-temperature multi-connectors is higher
than or equal to  20 C, the electric auxiliary heating shall not be automatically turned on. For
the low-temperature multi-connectors whose electric auxiliary heating is selected by the user,
a port is reserved for the controller, and the start and stop of the auxiliary electric heating system
is controlled by the units, the method of turning on and off the auxiliary electric heating shall
be explained in the instruction manual (or operation manual).
5.6 The tolerances shall satisfy the following stipulations:
a) The stated value of energy efficiency of the product shall not be less than the specified
value of the index corresponding to its rated energy efficiency grade, and shall be
within the value range corresponding to its rated energy efficiency grade.
b) The measured values of the SEER and EERmin of single-cooling multi-connectors, the
APF and EERmin of heat-pump multi-connectors, the IPLV(C) and EER of water-
cooled multi-connectors, the HSPF, COP12C and COP20C of low-temperature multi-
connectors shall not be less than 95% of the stated values. The measured values and
the stated values are in integral multiples of 0.01.
c) The stated nominal cooling capacity and the measured value of the multi-connectors
shall be within the range of the nominal cooling capacity corresponding to its rated
energy efficiency grade. The stated nominal heating capacity and the measured value
of the low-temperature multi-connectors shall be within the range of the nominal
heating capacity corresponding to its rated energy efficiency grade.
d) The measured cooling seasonal total energy CSTE (single-cooling) and the calculated
annual power consumption APC (heat-pump) of the multi-connectors shall be less
than or equal to 110% of the stated values; the measured heating seasonable total
energy HSTE of the low-temperature multi-connectors shall be less than or equal to
110% of the stated value.
6 Test Methods
6.1 Test Method for Energy Efficiency
6.1.1 The indoor unit combination stipulated by the producer and for the purpose of testing shall
be included in the ...