GB 25131-2010 English PDF (GB25131-2010)
GB 25131-2010 English PDF (GB25131-2010)
GB 25131-2010: Safety requirements for water chillers (heat pump) using the vapor compression cycle
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
Safety requirements for water chillers (heat pump)
using the vapor compression cycle
ISSUED ON: SEPTEMBER 26, 2010
IMPLEMENTED ON: JUNE 01, 2011
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of the People's Republic of
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 List of hazards ... 5
4 Safety requirements ... 6
5 Determination for safety requirements ... 13
6 Use information ... 19
Safety requirements for water chillers (heat pump)
using the vapor compression cycle
This Standard specifies safety requirements and determination for water chiller (heat pump) set (hereinafter referred to as ?€?the set?€?).
This Standard is applicable to motor-driven water chiller (heat pump) set using the vapor compression cycle.
Other liquid chiller sets can also refer to this Standard for implementation. 2 Normative references
The provisions in following documents become the provisions of this Standard through reference in this Standard. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Standard, however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB 4208-2008, Degrees of protection provided by enclosure (IP code) (IEC 60529:2001, IDT)
GB 4343.1, Electromagnetic compatibility requirements for household
appliances, electric tools and similar apparatus - Part 1: Emission (GB 4343.1-2009, IEC/ISPR 14-1:2005, IDT)
GB 4706.1-2005, Household and Similar Electrical Appliances - Safety - Part 1: General Requirements (IEC 60335-1:2001, IDT)
GB/T 5013.4, Rubber insulated cables of rated voltages up to and including 450/750V - Part 4: Cords and flexible cables (GB 5013.4-2008, IEC 60245- 4:2004, IDT)
GB/T 5023.3, Polyvinyl chloride insulated cables of rated voltages up to and including 450/750V - Part 3: Non-sheathed cables for fixed wiring (GB
5023.3-2008, IEC 60227-3:1997, IDT)
GB 5226.1-2008, Electrical Safety of Machinery - Electrical Equipment of Machines - Part 1: General Requirements (IEC 60204-1:2005, IDT)
that is held continuously by hand during normal use, its structure shall make operator?€?s hands unable to be in contact with metal parts during normal grasping.
4.3.6 For the parts that may fly out of the joints (couplings) of the exposed rotating shaft and the motor shaft (such as bolts, nuts, washers) or blades of the fan, it shall set a fixed protective device (such as protective cover or barrier). The protective device shall have sufficient strength, stiffness, corrosion resistance, fatigue resistance and high penetration resistance.
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:
- motor overload protection;
- high-pressure and/or low-pressure protection;
- high-temperature and/or low-temperature protection;
- oil pressure difference protection for compressor that uses forced oil supply; - phase sequence protection for the set that has phase sequence
The above protections are set according to the parameter values specified in relevant instruction manual.
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 Electrical equipment
cooling set, air cooling heat pump set, evaporative cooling set, after they are subject to the water spray test, the insulation resistance and withstand voltage shall meet requirements of 4.4.2 and 4.4.3.
4.4.6 Internal wiring
22.214.171.124 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.
126.96.36.199 The surface especially the inner surface of the metal hose or metal hole that the internal goes through the insulated wire, shall be flat, smooth or with insulating bushing. The metal hole shall have insulating retainer.
188.8.131.52 The internal wiring of the set must be firmly fixed and effectively prevent wiring from the contact with moving parts.
184.108.40.206 The yellow/green two-color wire can only be used for the grounding wire and connected to the grounding terminal. It cannot be connected to other terminals.
220.127.116.11 Aluminum wire shall not be used for internal wiring of the set. 18.104.22.168 The insulation of internal wiring of the set shall be able to withstand the possible electrical stress during normal use.
4.4.7 Wiring terminals for power connection and external leads
22.214.171.124 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.
126.96.36.199 For the fixed-installed set, the power cord can be directly connected to the power supply terminal of the power cut-off switch. Or provide a set of power supply terminals that meet the standard requirements. It shall allow the connection of fixed wiring cables that meet the required nominal cross-sectional area and voltage rating.
188.8.131.52 The power cut-off switch of the set shall meet the technical
specifications and safety requirements of the corresponding standard.
184.108.40.206 The wiring terminals for external wires of the set shall meet the relevant requirements of the provisions, so as to make all connections, especially the connection that protects the grounding circuit, strongly connected without the 4.5 Noise and vibration
4.5.1 When the set is designed and manufactured, it shall try to reduce the noise value and the vibration value.
4.5.2 The noise value of the set shall not exceed the specified value of corresponding set standard.
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.
4.7.1 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.
4.8.1 Refrigerant and lubricant charge
220.127.116.11 The refrigerant number shall match the nameplate. The performances of refrigerant and lubricant shall comply with the relevant standards.
18.104.22.168 Users are not allowed to change the type of refrigerant at will. When the refrigerant needs to be replaced, it shall be carried out in accordance with the instructions in the instruction manual. And set a new nameplate to prove the replacement of refrigerant.
22.214.171.124 When charging refrigerant and lubricant into the set, it shall carefully weigh and reach the specified amount.
4.8.2 Discharge of refrigerant vapor
126.96.36.199 The set shall avoid refrigerant leakage.
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.
5.3.7 For safety protective device
a) Motor overload protection: Check the product certificate of the overload protector shall be consistent with the nameplate. Simulate the action. The set shall be shut down;
b) High-pressure and/or low-pressure protection: If a high-pressure safety valve is used, check that the product certificate of conformity shall match the nameplate. If a fusible plug is used, check its re-inspection report and see if the infusible portion of the fusible plug is printed with a temperature mark in ?€???C?€?. If a high-pressure controller or high-pressure switch is used, make it simulate the action and the set shall be shut down;
c) High-temperature and/or low-temperature protection: Check the
temperature controller's product certificate shall match the nameplate. Make it simulate the action. The set shall be shut down;
d) The set with oil pressure difference protection: Check the product
certificate of the differential pressure controller shall match the nameplate. Make it simulate the action. The set shall be shut down;
e) The set with phase sequence protection: Check the product certificate of phase sequence protector shall match the nameplate.
5.3.8 When the set contacts the power supply, drive the manipulator of the emergency stop device, and the set power supply shall be cut off immediately. The set shall not be restarted when the manipulator is reset. And just when the boot is allowed, press the start button to start.
5.3.9 Check whether the set has accurate and reliable signal display when it starts and is operating.
exempted from this test.
5.4.4 Winding temperature rise test
The set can perform cooling or heat pump heating test, under a suitable cooling medium temperature, according to relevant provisions while using electrical resistance method to measure the temperature of winding of motor. The limit value of its winding temperature rise shall comply with the provisions in Table 2.
5.4.5 Moisture proof test
Under normal conditions, according to relevant provisions of Clause 14 in GB 4208-2008, perform water spraying insulation test to outdoor side of the set. Then perform insulation resistance test according to 5.4.2 and withstand voltage test according to 5.4.3, which shall comply with the provisions of 4.4.2 and 4.4.3, respectively.
After water spraying insulation test, visually inspect the inside of the enclosure. Water that enters the enclosure shall not reduce creepage and electrical clearance to below the minimum specified in 4.4.9.
5.4.6 Internal wiring
188.8.131.52 Determine whether the provisions on internal wiring slot and wiring are accepted through visual inspection.
184.108.40.206 Determine whether the provisions on metal hose or metal hole that the internal part passes through insulated wire are accepted through visual inspection.
220.127.116.11 Determine whether the provisions of 18.104.22.168 are accepted through visual inspection.
22.214.171.124 Determine whether the provisions on use and connection of
yellow/green two-color wire are accepted through visual inspection.
126.96.36.199 Determine whether the provisions of 188.8.131.52 are accepted through visual inspection.
184.108.40.206 The insulation performance of internal wiring shall comply with the cord insulation specified in GB/T 5023.3 or GB/T 5013.4 or the insulation of the following electrical strength test:
Apply 2000V voltage between the wire and the metal foil wrapped on the
outside of the insulation. Last 15min. It shall not penetrate.
NOTE: This test is only applicable to wiring that is subjected to grid voltage. 5.8 Refrigerant and lubricant
5.8.1 For the charging of refrigerant and lubricant, check the certificate of refrigerant and lubricant and weigh to determine if it meets the requirements. If the refrigerant is replaced, check if the set is equipped with a new nameplate. 5.8.2 For discharge of refrigerant vapor, in addition to qualified air tightness test in accordance with the provisions of 220.127.116.11, it shall check whether the ventilation area of the equipment room meets the requirements, according to the provisions of 6.1.3 in GB 9237-2001.
5.9 Test operation and maintenance
5.9.1 Test operation
18.104.22.168 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.
22.214.171.124 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).
Maintenance and repair of the set are in accordance with relevant provisions of 7.1.3 and 7.1.4 in GB 9237-2001.
6 Use information
Use information of the set consists of text, chart, mark, signal or symbol. It is a part of the set supply.
Use information provided by the set manufacturer shall meet requirements of 6.1 in GB/T 15706.2-2007.
The set?€?s use information is configured on the set itself (such as signals, warning devices, signs, nameplates, etc.) and accompanying files (especially in the instruction manual).
6.1 Signal and warning device
Visual signals (such as flashlights) and audible signals (such as alarms) are used for dangerous situations.