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GB 25131-2010: Safety requirements for water chillers (heat pump) using the vapor compression cycle
GB 25131-2010
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.200
J 73
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
China.
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
1 Scope
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
requirements.
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
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.
4.4.6.2 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.
4.4.6.3 The internal wiring of the set must be firmly fixed and effectively prevent
wiring from the contact with moving parts.
4.4.6.4 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.
4.4.6.5 Aluminum wire shall not be used for internal wiring of the set.
4.4.6.6 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
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.
4.4.7.2 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.
4.4.7.3 The power cut-off switch of the set shall meet the technical
specifications and safety requirements of the corresponding standard.
4.4.7.4 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 ...