GB/T 21362-2008Heat pump water heater for commercial and industrial and similar application (English PDF)

3.1 Heat pump water heater

A motor-driven device that uses vapor compression refrigeration cycle to

transfer heat from a low-grade heat source (air or water) to heated water for

making hot water.

3.2 Air-source heat pump water heater

A heat pump water heater that uses air as the heat source.

3.3 Water-source heat pump water heater

A heat pump water heater that uses water as a direct heat source or as a heat

transfer medium to transfer heat.

3.4 One-time heating heat pump water heater

A water heater that uses side-feed water to flow through the heat pump water

heater to reach the set termination temperature at one time.

materials shall be non-toxic, non-odor and non-flammable materials, and shall

meet the requirements of GB 8624.

5.1.10 When water inlet and outlet pipes of the water heater's pressure-

resistant water tank are directly installed in the public water supply system, the

water inlet and outlet pipes shall comply with the requirements of the relevant

national water pipe connector standards.

5.1.11 Electrical control equipment

The control equipment of water heaters shall be able to function properly.

Various protection devices shall meet the design requirements and be sensitive

and reliable.

5.1.12 The installation of each component of the water heater shall be firm

and reliable. The compressor shall have anti-vibration measures. There shall

be no abnormal sound when the water heater operates. There shall be no

friction and collision between pipelines and components. The electromagnetic

directional valve of the water heater shall be sensitive and reliable.

5.1.13 The circulating water pump provided for the water heater shall ensure

the normal operation of the water heater with its flow and head. The heat-source

heat exchanger and the hot-water heat exchanger provided for the water heater

shall meet the relevant requirements for hot water.

5.1.14 Salt spray resistance of electroplating parts

After being tested according to the method of 6.4.11, the area of rust on each

rust spot on the metal plating shall not exceed 1mm2; there shall be no more

than 2 rust spots or rust on the area of 100cm2 of the test piece coating; when

it is less than 100cm2, there shall be no rust spot and rust.

5.1.15 Coating adhesion of coating parts

The coating of the coating parts shall be firm. After being tested according to

the method of 6.4.12, the adhesion shall be up to Level 2 or above specified in

GB/T 1720.

5.2 Safety requirements

The safety requirements for water heaters shall comply with the relevant

provisions of JB 8654.

5.3 Performance requirements

5.3.1 Airtightness requirements for the heating system

Each part of the water heater's heat pump system shall be sealed. After being

When tested in accordance with the method of 6.4.6, the heating parts of the

air-source heat pump water heater shall not be damaged. Meanwhile, the high-

pressure, anti-freeze, and overload protectors shall not be opened, and the unit

shall be able to operate normally.

5.3.6 Automatic defrosting

When performing defrosting test on the air-source heat pump water heater in

accordance with the method of 6.4.7, the following requirements shall be met.

— The safety protection elements and devices shall not operate and shall

stop operation;

— The defrosting function is normal; the defrosting is thorough; the melting

water in the defrosting shall be able to be discharged normally;

— In the continuous operation after the initial defrosting is completed, the

total time required for defrosting shall not exceed 20% of the operating

cycle time; for the unit equipped with more than two independent

refrigeration cycles, the sum of the independent cycle defrosting time

shall not exceed 20% of the total running time of each independent cycle.

5.3.7 Requirements for the minimum load condition

The water-source heat pump water heater shall adopt low-temperature

protection on the heat source side. When tested in accordance with the method

of 6.4.8, the following requirements shall be met.

— The protective device is not allowed to open; the water heater cannot be

damaged;

— The low-temperature protection function is normal; when the heat-source

water temperature is equal to or higher than the allowable cryogenic

temperature, the water heater shall be able to function normally.

5.3.8 Off-design performance

The temperature conditions for off-design performance of the water heater are

shown in Table 1 and Table 2.TEST in accordance with the method of 6.4.9.

DRAW a performance graph or chart.

5.3.9 Noise

Water heaters shall make noise measurements in accordance with the

provisions of 6.4.10.The actual measured maximum noise value shall not be

greater than the specified value in Table 5, and shall not be greater than the

unit's indicated value. The tolerance shall be +3dB(A).

6.4.2.2 FILL the pressure-resistant water tank with clean water. ENSURE 1.25

times the design pressure. OBSERVE all parts and connectors, which shall

comply with the provisions of 5.3.2.2.

6.4.3 Electrical control equipment test

The water heater runs continuously under conditions close to the nominal

heating conditions. CHECK the electrical control equipment and protective

devices, which shall comply with the provisions of 5.1.1.1.

6.4.4 Nominal condition performance test of water heater

6.4.4.1 Heating capacity test

Under the nominal conditions specified in Table 1 and Table 2, and the power

conditions specified in 6.1.2, DETERMINE the heating capacity of the water

heater using the method of Annex B. The additional electrical heating shall not

be turned on.

6.4.4.2 Heating consumed power test

While determining the heating capacity according to the method of Annex B,

DETERMINE the total heating consumed power during the operation of the

water heater.

6.4.4.3 Electrical heating test for additional electrical heating heat pump

water heater

When the additional electrical heating heat pump water heater is conducted

with the heat pump heating capacity test according to 6.4.4.1, after the

termination temperature of water reaches the manufacturer specified

temperature, ENERGIZE the auxiliary electric heater, and DETERMINE the

consumed electric power, which shall comply with the provisions of 5.3.3.4.

6.4.4.4 Water-side pressure loss test

The water-side pressure loss shall be determined according to the method for

measuring the pressure loss on the water side of the unit specified in GB/T

18430.1 Measured pressure loss on the service side and heat source side shall

meet the requirements of 5.3.3.5.

6.4.5 Maximum load condition test

6.4.5.1 One-time heating heat pump water heater

At rated frequency, the test voltage is 90% and 110% of the rated voltage,

respectively. OPERATE according to the maximum heating load conditions

specified in Table 1 and Table 2.After reaching stability, RUN continuously for

1h. Then STOP for 3min (the voltage increases by no more than 3% during this

condition.

6.4.8 Minimum load condition test

6.4.8.1 One-time heating heat pump water heater

At rated frequency and rated voltage, the water-source heat pump water heater

is operated under the minimum operating heating conditions specified in Table

6.4.8.2 Circulate heating heat pump water heater

At rated frequency and rated voltage, the water-source heat pump water heater

is operated under low-temperature heating conditions and test water flow

specified in Table 2.SHUT down after the temperature of the water tank on the

service side of the water heater reaches the termination temperature of water

of this condition.

6.4.9 Off-design test

When a certain condition in Table 1 and Table 2 changes, other conditions are

tested according to the flow conditions and temperature conditions under

nominal conditions. DETERMINE the heating capacity and the corresponding

heating consumed power. The test shall include the condition points of

corresponding condition temperatures in Table 1 and Table 2.The test results

are plotted as a graph or table. Each graph or table shall have the values of not

less than 4 measurement points.

6.4.10 Noise test

At rated voltage and rated frequency of the water heater, MEASURE the noise

of the unit under near-nominal conditions, in accordance with the method of

Annex D in JB/T 4330-1999.

6.4.11 Salt spray resistance test for electroplating parts

The electroplating parts of the water heater shall be conducted with the salt

spray test according to GB/T 2423.17, with a test cycle of 24h. Prior to the test,

the surface of the electroplating parts is cleaned for degreasing. After the test,

USE clean water to wash away the salt remaining on the surface. CHECK the

electroplating parts for corrosion. The results shall comply with the provisions

of 5.1.14.

6.4.12 Coating adhesion test for coating parts

The coating parts of the water heater shall be conducted with the adhesion test

according to GB 1720.The adhesion shall comply with the provisions of 5.1.15.

8.1 Marking

8.1.1 Each water heater shall be provided with a permanent nameplate in a

prominent position. The nameplate shall comply with the provisions of GB/T

8.1.2 Other marking requirements. The relevant parts of the water heater shall

be marked with operating status [such as water inlet and outlet, drain outlet,

and refrigerant gas valve, liquid valve, etc., safety signs (such as grounding

devices, warning signs, etc.)].

8.1.3 The water heater packaging containers shall have the following signs.

a) manufacturer's name;

b) product model, name and trademark;

c) net weight, and gross weight;

d) package dimensions;

e) executive standards;

f) other signs (or. the relevant packaging, pictorial marking for handling of

goods, and transport package shipping marks shall comply with the relevant

provisions of GB/T 191 and GB/T 6388, respectively).

8.1.4 The executive standard number of the product shall be marked in the

corresponding places (such as nameplate, product manual, etc.).

8.2 Packaging

8.2.1 The water heater shall be cleaned before packaging. The parts shall be

clean and dry. Rusty parts shall be coated with rust inhibitors. The water heater

shall be covered with a plastic cover or moisture-proof paper, and shall be fixed

in the packaging container. The packaging shall meet the requirements of GB/T

13384.

B.3.1.3 Data to be recorded

a) Heat source side. dry-bulb temperature, and wet-bulb temperature (air-

source water heater); water inlet temperature, and water flow (water-source

water heater);

b) Service side. mass of the heated water, heating time, water heater's power

consumption within the heating time, initial temperature of water,

termination temperature of water, and circulating water flow.

B.3.2 Test requirements

B.3.2.1 The water inlet (outlet) temperature on the service side and heat

source side, and air temperature (humidity) on the heat source side of the unit,

as well as the allowable deviations of all these parameters shall meet the

requirements for test conditions specified in the assessment condition table.

The amount of water in the standard water tank is the heating water flow heated

by the heat pump water heater for 1h.

B.3.2.2 The voltage and frequency of the power supply shall meet the

requirements for test conditions.

B.3.2.3 The test devices need to be calibrated.

B.3.2.4 The pipeline and standard water tank need to be insulated.

B.3.2.5 The absolute value of the difference between the temperature of each

measuring point and the average temperature in the standard water tank shall

not be greater than 0.3°C.

B.3.3 Test device calibration

B.3.3.1 The test devices shall be periodically calibrated to verify the

measurement accuracy of the test devices. The calibration test shall be carried

out at least once every six months. After major changes in test devices, a

calibration test shall also be conducted.

B.3.3.2 The calibration test device is shown in Figure B.3.The calibration

device is connected to the test device instead of the tested heat pump water

heater.

B.3.3.3 In the calibration test, ADJUST the operating conditions on the heat

source side and the service side so as to be consistent with the test assessment

condition table of the water heater, and to be within the range of allowable

deviation.

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