GB/T 23137-2020Heat pump water heater for household and similar application (English PDF)

3.1 Heat pump water heater

Heater pump water heater refers to an equipment that utilizes a motor-driven vapor compression refrigeration cycle to transfer heat from air or water to heated water to produce domestic hot water.

3.2 Air-source heat pump water heater

Air-source heat pump water heater refers to a heat pump water heater using ambient air as the heat source.

3.3 Water-source heat pump water heater

Water-source heat pump water heater refers to a heat pump water heater using water (including water drawn from wells, lakes, seas or rivers, or water circulated in underground coils, and available water for other purposes) as the heat source.

3.4 Instantaneous heat pump water heater

Instantaneous heat pump water heater refers to a heat pump water heater, in which, the initial cold water flows through the heat exchanger inside the heat pump water heater once and reaches the temperature set by the user.

3.5 Circulating heat pump water heater

Circulating heat pump water heater refers to a heat pump water heater, in which, the initial cold water flows through the heat exchanger inside the heat pump water heater for several times and gradually reaches the set temperature.

4.1 Types of Classification

4.1.1 Classification by the mode of heat source.

4.1.2 Classification by the type of power source.

4.2 Optimal Values

4.2.1 The recommended optimal values of the rated capacity of the water storage tank of the heat pump water heater are.

4.2.2 The recommended optimal values of the rated heating water capacity of the heat pump water heater are.

4.3 Model Naming

Example: KFD-BpY70/150A represents a split-type air-source instantaneous variable-frequency heat pump water heater with an auxiliary electrical heat source, a heating water capacity of 70 L/h and a water tank capacity of 150 L, and the manufacturer's customized serial No. is A.

4.4 Basic Parameters

The test conditions of the heat pump water heater are shown in Table 1 and Table 2.

5.1 General Requirements

5.1.2 On the premise that the quality of the inlet water complies with GB 5749, all pipelines and heat exchange equipment on the water-side of the heat source shall have the ability to resist corrosion; during use, the heat pump water heater shall not contaminate the water source used.

5.2 Structural Requirements

5.2.1 The fasteners and other components of the heat pump water heater shall comply with relevant national standards, and its wearing parts shall be easy to replace.

5.2.2 When the water inlet and outlet pipes of the heat pump water heater are directly installed in the sub-water supply system, the water inlet and outlet pipes shall comply with the requirements of relevant national standards.

5.3 Weather Resistance Requirements

After being subject to the test in accordance with 6.14, the heat pump water heater shall comply with the following requirements. […]

5.4 Air-tightness and Pressure-bearing Requirements

5.5 Performance Requirements for the Heat Pump Water Heater under Nominal Conditions

5.5.1 Heat pump heating capacity

When carrying out the test in accordance with the method of 6.3, the measured heating capacity of the heat pump shall not be less than 95% of the nominal value of the heat pump heating capacity.

5.5.2 Heating water capacity

When carrying out the test in accordance with the method of 6.3, the measured heating water capacity shall not be less than 95% of the nominal value of the heating water capacity.

5.5.5 High-temperature heating performance

5.5.8 Requirements for annual average heating performance of heat pump

5.6.1 General requirements

The heat pump water heater shall be able to operate normally under the temperature conditions specified in Table 1 or Table 2.

5.6.2 Maximum operation

When carrying out the test in accordance with the method of 6.5, during the whole test process, each component of the heat pump water heater shall not be damaged, and the heat pump water heater shall be able to operate normally.

5.7 Hot Water Storage Performance

5.7.1 Insulation performance

The insulation performance shall be tested in accordance with the method of 6.10. After 24 h of storage, the drop in temperature of the hot water shall not be greater than the requirements of Table 5.

5.7.2 Performance

5.8 Noise

The noise of the heat pump water heater shall comply with the following requirements. […]

5.9 Requirements for Packaging

After being subject to the test of 6.12, the packaging box, foam and other protective accessories shall not be deformed to affect the protective function. The heat pump water heater in the packaged state shall comply with the relevant stipulations of GB/T 1019. The air-tightness and noise of the refrigeration system shall comply with the stipulations of 5.4.1 and 5.8.

5.10 Requirements for Transportation

After being subject to the test in accordance with the method specified in 6.13, the heat pump water heater shall not be damaged and the fasteners shall not be loose. The refrigerant leakage and noise shall comply with the stipulations of 5.4.1 and 5.8.

6.1 General Conditions of Test

6.1.1 Temperature conditions

The test conditions of the air-source heat pump water heater shall comply with the stipulations of Table 1; the test conditions of the water-source heat pump water heater shall comply with the stipulations of Table 2. Select the corresponding operating conditions for the test.

6.1.2 Power supply conditions

6.1.3 Test instruments and meters

6.1.4 General requirements for test

6.2 Air-tightness and Pressure-bearing Tests of Heat Pump Water Heater

6.2.1 Air-tightness test for refrigeration system

6.2.2 Pressure-bearing test for water system

Apply water pressure to the container and heat exchanger; increase the water pressure to the following specified value at a rate of 0.13 MPa/s and maintain at this value for 5 min. The water pressure is.

6.3 Heat Pump Heating Capacity

6.3.1 General conditions of test

If there is no special requirement, the heat pump heating capacity test shall be carried out under the following conditions.

6.3.2 Test method for heat pump heating capacity

6.4 Heat Pump Heating Power Input

While testing the heating capacity of the heat pump, determine the heat pump heating power input. For the circulating heat pump water heaters and the static heat pump water heaters, the heat pump heating power input is the ratio of electricity consumption to heating time.

6.5 Maximum Operation

6.5.1 Instantaneous heat pump water heaters

At the rated frequency, respectively adjust the test voltage to 90% and 110% of the rated voltage.

Under the maximum operating conditions specified in Table 1 or Table 2, start the operation of the heat pump water heater. After reaching a stability, continuously operate for 30 min, then, stop for 3 min (during this period, the voltage rise shall not exceed 3%); start to operate for 30 min.

6.6 Automatic Defrosting

6.7 Minimum Operation

6.7.1 Minimum operation test for instantaneous heat pump water heaters

Under the minimum operating conditions specified in Table 1 or Table 2, make the heat pump water heater operate, until the operating conditions are stable, then, operate for 4 h.

6.7.3 Minimum operation test for static heat pump water heaters

Connect the water tank (water tank of the maximum capacity) in standard configuration of the heat pump water heater; under the minimum operating conditions specified in Table 1 or Table 2, start the operation, until the heat pump water heater reaches the maximum set temperature, then, stop.

6.8 Low-temperature Operation with Hot Water

6.10 Hot Water Storage Performance

6.11 Noise Test

6.11.1 Measurement site

The measurement site shall be a full or semi-anechoic chamber on the reflection plane. The difference between the noise of the heat pump water heater under test and the background noise shall be above 10 dB(A).

6.11.2 Measuring instruments

The test instruments shall use a sound level meter of Type I or above specified in GB/T 3785.1-2010, and other test instruments with comparable accuracy.

6.11.3 Installation conditions

The heat pump water heater shall be installed in accordance with the relevant technical conditions, and both the outdoor unit and the water tank shall be placed on a 5 mm thick rubber pad (with a shore hardness of 45).

7.1 Category of Inspection

The inspection of the heat pump water heaters is generally classified into exit-factory inspection, sampling inspection and type inspection.

7.2 Exit-factory Inspection

7.2.1 All heat pump water heaters submitted for delivery shall be subject to exit-factory inspection in accordance with the corresponding product inspection management regulations.

The test items, test requirements and test methods of the exit-factory inspection are shown in the stipulations of Table 11. Each unit shall pass the inspection of the production line before exiting the factory, and be accompanied by quality inspection certificate, installation instructions, warranty sheet, packing list and other documents and accessories.

7.2.2 After the exit-factory inspection, all qualified products can be delivered as qualified products (genuine products); disqualified products found through inspection are not allowed to be mixed into qualified batches, and shall be properly reworked to restore to a qualified state, then, they can be delivered as qualified products; products that still cannot be restored to a qualified state after rework must not be treated as qualified products.

7.3 Sampling Inspection

The sampling inspection items, test requirements and test methods are shown in Table 11. The sampling shall be carried out in accordance with GB/T 2828.1. The sampling inspection items, batch size, sampling scheme, inspection level and acceptable quality level of the batch-by-batch inspection may be determined by the quality inspection department of the manufacturer. After passing the sampling inspection, all qualified products can be delivered to the ordering party as qualified products.

7.4 Type Inspection

7.4.1 Under one of the following circumstances, the heat pump water heaters shall be subject to the type inspection.

7.4.2 The type inspection items include all the test items specified in the items listed in Table 11.

7.4.3 The sampling for type inspection shall be carried out in accordance with GB/T 2829-2002, and a one-time sampling scheme with discrimination level I shall be adopted. See Table 12 for the sample size and rejection quality level.

7.4.4 The safety items of the type inspection are all fatal flaws, and the determination of the safety items must be 100% qualification. If there is one disqualified item, then, the cycle of products shall be determined as disqualified.

7.4.5 The samples of the type inspection shall be randomly taken from qualified finished products, and the samples of the type inspection shall not be delivered to the ordering party as qualified products.

8.1 Marking

8.1.1 Each heat pump water heater shall have a durable nameplate fixed on an obvious place.

The nameplate shall clearly mark the following items, and shall also mark the relevant contents required by GB 4706.32 and GB/T 5296.2.

8.1.2 The heat pump water heaters shall be provided with signs indicating the working conditions, such as. control switches and knobs, and other signs indicating the rotation direction; be attached with circuit diagrams at appropriate locations.

8.1.3 On the water storage tank of the split-type heat pump water heaters, there shall be a durable nameplate fixed on an obvious place. The nameplate shall clearly indicate the following items.

8.1.4 The heat pump water heaters shall have a registered trademark.

8.1.5 Packaging signs and packaging boxes shall be clearly marked with.

8.2 Packaging

8.2.1 Before packaging, the heat pump water heaters shall be cleaned and dried.

8.2.2 The packaging of the heat pump water heaters shall comply with the requirements of 5.10.

8.3 Transportation and Storage

8.3.1 During the transportation and storage, the heat pump water heaters shall be protected from severe vibration, collision, dumping, rain and snow, and chemical corrosion.

8.3.2 The environmental conditions for the product storage shall comply with the relevant stipulations of GB/T 4798.1. The products shall be stored in a dry and ventilated warehouse with no corrosive and harmful gases around.

8.3.3 After the package is opened, if the product still needs to be stored, it shall be re-packaged. […]