GB 25131-2010Safety requirements for water chillers (heat pump) using the vapor compression cycle (English PDF)

4.3 Structure and safety protective device

4.3.1 For outdoor air chiller set, its shell moisture-protection requirements are classified according to GB 4208, at least be IPX4.

4.3.2 When the outdoor unit of the set is exposed to rain or snow frost, it shall not cause danger to electrical parts.

4.3.3 The set shall not have rough or sharp edges and exposed tips that can pose a hazard to user during normal use or maintenance period.

4.3.7 When overcurrent, overload or other parameters (such as pressure, temperature, etc.) exceed the specified range, it shall set safety protective devise such as overcurrent, overload protector or various controllers. The set shall at least set.

4.3.8 For the set that the cooling capability is greater than 150kW, it shall install an emergency stop device. The emergency stop device shall be set in a position that is obvious and easy to distinguish and operate. When the manipulator of the emergency stop device is reset, the set can only be started automatically when automatic start is allowed.

4.3.9 When the set is started and operating as normal, it shall have accurate and reliable signal display.

4.3.10 When the set has failures such as overload or high-pressure, low- pressure as well as high-temperature, low-temperature exceeding the limit values, it shall be able to alarm or stop.

4.3.11 The control system of the set shall be set with water flow interrupting interlock protection. When a current interruption fault occurs, it shall be able to alarm and stop.

4.4.1 Protection against electric shock

4.4.2 Insulation resistance The insulation resistance between the electrified part of the set and the non- electrified part that might be grounded, when the rated voltage single-phase AC is 220V, three-phase AC is 380V, shall not be less than 2M. When the rated voltage three-phase AC is 3000V, 6000V, it shall not be less than 5M. When the rated voltage three-phase AC is 10000V, it shall not be less than 10M.

4.4.3 Withstand voltage After the insulation resistance test, when the test voltage specified in

5.4.3 is applied between the electrified part and the non-electrified part of the set, there shall be no breakdown and flashover.

4.4.6 Internal wiring

4.4.6.1 The internal wiring of the set shall be smooth, without sharp edges. The wiring shall be protected from the contact with burrs, heat exchanger fins, so as to avoid the damage to wiring insulation.

4.4.7 Wiring terminals for power connection and external leads

4.4.7.1 The set of which rated voltage is under 600V uses single power supply mode. If other power supplies are required for some parts (such as electronic circuit) of electrical equipment, these power supplies shall be taken from components (such as transformer) that are part of the set's electrical equipment. For the set of which its compressor uses a high-voltage generator that its rated voltage is above 3000V, it shall need different high-, low- voltage introducing power supply. The connection shall comply with relevant provisions.

4.4.7.9 The set shall be connected to an external protective grounding system or external protective conductor, according to the distribution system and related installation standards. The terminal of this connection shall be placed in the vicinity of the relevant phase line terminal of each incoming power supply. This terminal shall be sized to be connected to an external copper protective conductor of the cross-sectional area specified in Table 3.

4.6 Pressure vessel

4.6.1 The design, manufacture, mark and test of pressure vessel are in accordance with JB/T 4750.

4.6.2 The pressure vessel that can store liquid refrigerant and can be isolated from other components of the refrigeration system shall use safety relief device for overpressure protection. The pressure relief device is in accordance with the relevant provisions of

5.3.2 in GB 9237-2001.

4.7 Material

4.7.1 The steel materials, non-ferrous metals, alloys and non-metal materials used in the set shall be in accordance with the relevant provisions of

5.2 in GB 9237-12000.

4.7.2 The insulation materials used shall be flame retardant, non-toxic, odorless. The binder shall be non-toxic. The pasting or fixing shall be firm.

4.8 Refrigerant and lubricant Refrigerant classification is in accordance with the provisions of

4.3 in GB 9237- 2001.

4.8.2 Discharge of refrigerant vapor

4.8.2.1 The set shall avoid refrigerant leakage.

4.8.2.2 The refrigerant extracted from the set can only be injected into the qualified liquid storage bottle. Except that the refrigerant is discharged due to allowable small leakage, non-condensable gas emission, oil drain or other accidents, refrigerant shall not be discharged into the atmosphere or sewers, rivers, lakes, etc.

4.8.2.3 The engine room shall be well ventilated to prevent accidental leakage of refrigerant and suffocation or explosion hazard.

4.9.2 Maintenance

4.9.2.1 Eat set shall be managed and repaired according to its size and type. Operators shall receive adequate training.

4.9.2.2 When adding or replacing refrigerants, pay full attention to the contents of the cylinder so as to avoid accidental explosion or other accidents caused by unqualified substances.

5.3 Structure and safety protective device

5.3.1 Respectively perform tests according to Clause 12 or Clause 14 requirements in GB 4208-2008 and corresponding provisions.

5.3.2 For the provisions of 4.3.2, check according to the requirements of

5.4.5 and corresponding provisions.

5.3.3 For the provisions of 4.3.3, perform visual inspection to determine whether it is accepted.

5.3.4 For the provisions of 4.3.4, perform visual inspection and manual test to determine whether it is accepted.

5.3.5 For the provisions of 4.3.5, perform visual inspection and manual test to determine whether it is accepted.

5.3.6 Check that the protective shield or cover of the coupling and fan impeller (plate) shall be fixed (must use tools with fasteners to install and remove). Firmly install.

5.4.6 Internal wiring

5.4.6.1 Determine whether the provisions on internal wiring slot and wiring are accepted through visual inspection.

5.4.6.2 Determine whether the provisions on metal hose or metal hole that the internal part passes through insulated wire are accepted through visual inspection.

5.4.6.3 Determine whether the provisions of

4.4.6.3 are accepted through visual inspection.

5.4.6.4 Determine whether the provisions on use and connection of yellow/green two-color wire are accepted through visual inspection.

5.4.6.5 Determine whether the provisions of

4.4.6.5 are accepted through visual inspection.

5.9.1 Test operation

5.9.1.1 Perform air tightness test, vacuum test and hydraulic test on the water side of the set according to the test methods specified in relevant standard provisions. The test results shall comply with the provisions of relevant standards.

5.9.1.2 When performing air tightness test of the set, it shall carefully check the color mark on the outside of the cylinder. And inspect outside in accordance with relevant provisions. Use it when it is confirmed not oxygen, any combustible gas or combustible gas mixture (except inflating directly with an air compressor).

5.9.2 Maintenance Maintenance and repair of the set are in accordance with relevant provisions of

7.1.4 in GB 9237-2001.

6.3 Installation and instruction manual

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