GB/T 18837-2015Multi-connected air-condition(heat-pump)unit (English PDF)

4.1 Type

4.1.1 Classification by functions. single-cold, heat pump, heat recycling.

4.1.2 Classification by the structural form of indoor unit. floor stand, wall mounted, ceiling hung, embedded, hidden mounted, air pipe type.

4.2 Model The model of unit shall be designated by the manufacturer, however, the model shall reflect the cooling capacity of the unit under the nominal operating conditions.

4.3 Basic parameters

4.3.1 The power of unit is the rated voltage 220V single phase or 380V three phase AC power with the rated frequency of 50Hz.

4.3.4 For indoor unit or outdoor unit which is not connected to air pipe on site, its external static pressure is

0 Pa; for indoor or outdoor unit with air pipe, the external static pressure shall be indicated.

5.1 General requirements

5.1.1 The unit shall comply with this Standard; and it shall be produced according to the drawings and technical documents which are approved according to the stipulated procedure.

5.1.4 The calibration of the nominal cooling capacity of indoor unit shall be carried out in accordance with the test method as stipulated in Annex G.

5.2 Safety requirements The safety requirements of the unit shall comply with GB 25130 and GB 9237.

5.4.4 Requirements on normal operation The unit shall work safely and reliably under various nominal conditions prescribed by the manufacturer, including maximum height difference between indoor and outdoor units, maximum connecting pipe length between indoor and outdoor units, maximum height difference between indoor units, maximum ordonnance rate, minimum ordonnance rate, cooling at the maximum environmental temperature, and heating at the minimum environmental temperature, etc.

5.4 Performance requirements

5.4.1 Cooling system sealing property The leakage amount of freezing medium of each part of cooling system shall not be greater than 14 g/a.

5.4.3 Cooling capacity The actual cooling capacity of the unit shall not be lower than 95% of the nominal cooling capacity.

5.4.8 Maximum operating cooling

5.4.8.1 Each part of the unit shall not be damaged and shall work normally during the maximum cooling operation of the unit; overload protector shall not be tripped off.

5.4.9 Maximum operating heating

5.4.9.1 Each part of the unit shall not be damaged; it shall work normally during the maximum operating heating period; the overload protector shall not be tripped off.

5.4.9.2 When the unit stops after 3 min, re-start the unit for 1 h continuous operation; during which period, the overload protector is allowed to trip-off within the first 5 min of activating operation, however, the tripping-off is not allowed after that; for the unit with overload protector not reset within the first 5 min but reset within 30 min since shutdown, 1 h continuous operation is required.

5.4.17 Water-side pressure-drop The water-side pressure-drop of water-cooled unit through water-cooled heat exchanger under the stipulated operating conditions shall not be greater than 105kPa nor greater than 115% of the indicated value.

6.1 Test instruments and test operating conditions

6.1.1 The instruments used in the cooling capacity, heating capacity tests and seasonal energy efficiency ratio test (SEER) annual performance factor test (APF) shall comply with Annex A of GE/T 17758-2010 and Annex B of GB/T 10870-2014.

6.1.2 The cooling integrated part load value test of water-cooled unit and test instruments shall comply with Annex A of GB/T 17758-2010.

6.1.3 The test operating conditions are described in

4.3.3 where the unit shall be tested at the corresponding condition.

6.3.6 Direct blow-off indoor unit combination shall be used preferably for test or the indoor unit combination with the minimum outdoor static pressure air pipe.

6.4 Test methods

6.4.1 Seal performance test of cooling system For the unit of which the cooling system uses normal freezing medium AND the cooling capacity is less than or equal to 28kW, USE normal freezing-medium leak detector of which the sensitivity is 1X10-

6 Pa·m3/s to conduct the test; for the unit of which the cooling capacity is greater than 28kW, USE normal freezing-medium leak detector of which the sensitivity is 1X10-

5 Pa·m3/s to conduct the test.

6.4.5 Heating capacity test

6.4.5.1 Test shall be carried out according to Annex C under the heating operating conditions as stipulated in 4.3.3.

6.4.5.2 Indoor unit and outdoor unit shall be connected according to the connection method and requirements as shown in Figure 1, 2, 3 or

4.Start all the indoor and outdoor units to assure them at the working state. Measure the heating capacities of all the indoor units which are being operated; the total of heating capacities are the heating capacity of the tested unit.

6.4.11 Minimum operating heating test of indoor unit Indoor unit and outdoor unit shall be connected according to the connection method and requirements as shown in Figure 1, 2, 3 or

4.Start all the indoor and outdoor units to assure them at the working state. Regulate the temperature controller, fan speed, air door, and guide blade of the tested indoor unit to the state that the maximum heating capacity can be easily reached, while not violating the stipulations of manufacturer; continue operating for 4 h after the units operate stably at the minimum operating heating conditions as stipulated in Table 1.

7.2 Sampling inspection

7.2.1 The sample unit shall be selected from the products which have been tested as qualified. The inspection items and test methods are prescribed in Table 7.

7.3 Type inspection

7.3.1 For the new product or approved product with significant improvement, the first product shall receive type inspection. The type inspection items are prescribed in Table 7.

7.3.2 The time for type inspection shall not be less than the time as prescribed in the test methods; if there is fault occurred during operation, solve the fault and then re-start the inspection.

8.1 Labeling

8.1.1 Each unit shall be set with permanent nameplate at the eye-catching place of indoor and outdoor units. The contents on the nameplate shall comply with GB/T 13306.The nameplate shall display the following contents.

8.1.2 For air cooled unit, the main parameters such as middle cooling capacity, middle input power, minimum cooling capacity, minimum input power, middle heating capacity, middle input power, minimum heating capacity, minimum input power, low temperature heating capacity, low temperature input power, and standby power shall be indicated at the corresponding place (such as nameplate or instructions).

8.2 Packaging

8.2.1 The unit shall be cleaned before packaging. Each part shall be sterilized and dried; the rust-prone components shall be coated with anti-rust agent.

8.2.2 The unit shall be covered in a plastic bag or water proof paper, then fixed in the packing box to protect the product from moisture or mechanical damage.

8.3 Transportation and storage

8.3.1 The unit shall be protected from collision, inclination or rain or snow during transportation or storage.