Safety of household and similar electrical appliances - Part 17: Particular requirements for motor-compressors
1 Scope
This clause of GB/T 4706.1-2024 is replaced by the following.
This document specifies the safety requirements for household and similar use electric motor compressors.
This document deals with the safety of sealed (hermetic and semi-hermetic type) motor-compressors, their protection and control systems, if any, which are intended for use in equipment for household and similar purposes and which conform with the standards applicable to such equipment. It applies to motor-compressors tested separately, under the most severe conditions that may be expected to occur in normal use, their rated voltage being not more than 250 V for single-phase motor-compressors and 600 V for other motor-compressors.
This standard also covers
——multi-speed motor-compressors, that are motor-compressors, the speed of which can be set to different values;
——variable capacity motor-compressors that are motor-compressors where the capacity of the compressor is controlled at fixed speeds.
Note 101: Examples of equipment which contain motor-compressors are
——tumble dryers (IEC 60335-2-11);
——refrigerating appliances, ice-cream appliances and ice-makers (IEC 60335-2-24);
——electrical heat pumps, air-conditioners and dehumidifiers (IEC 60335-2-40);
——commercial dispensing appliances and vending machines (IEC 60335-2-75);
——commercial refrigerating appliances and ice-makers with an incorporated or remote refrigerant unit or compressor (IEC 60335-2-89);
——electrical equipment for measurement, control, and laboratory use (IEC 61010-2-011 );
——professional ice-cream makers (IEC 60335-2-118);
——refrigerating systems and heat pumps (ISO 5149-2).
This standard does not supersede the requirements of standards relevant to the particular appliance in which the motor-compressor is used. However, if the motor-compressor type used complies with this standard, the tests for the motor-compressor specified in the particular appliance standard may not need to be made in the particular appliance or assembly. If the motor-compressor control system is associated with the particular appliance control system, additional tests could be necessary on the final appliance.
So far as is practical, this standard deals with the common hazards presented by motor-compressors used in appliances which are encountered by all persons in and around the home. However, it does not in general take into account
——the use of appliances by young children or infirm persons without supervision;
——playing with the appliances by young children.
Note 102: Attention is drawn to the fact that
——for motor-compressors intended to be used in appliances in vehicles or on board ships, additional requirements could be necessary;
——in many countries, additional requirements are specified by the national health authorities, the national authorities responsible for the protection of labour and similar authorities.
This standard does not apply to
——motor-compressors designed exclusively for industrial purposes;
——motor-compressors used in appliances intended to be used in locations where special conditions prevail, such as the presence of a corrosive or explosive atmosphere (dust, vapour or gas).
Note 103: If motor-compressors for refrigerant R-744 used in appliances with a transcritical refrigeration system are equipped with pressure relief devices, compliance with the requirements for these devices is checked during the tests on the final appliance .
2 Normative references
This clause of GB/T 4706.1-2024 is applicable, except as follows.
Addition:
ISO 817:2014 Refrigerants - Designation and safety classification
ISO 7010:2019 Graphical symbols - Safety colours and safety signs - Registered safety signs
IEC 60079-1 :2014 Explosive atmospheres - Part 1: Equipment protection by flameproof enclosures "d"
IEC 60079-15:2017 Explosive atmospheres - Part 15: Equipment protection by type of protection ”n”
IEC 60851-4:2016 Winding wires - Test methods - Part 4: Chemical properties
IEC 60851-5:2008 Winding wires - Test methods - Part 5: Electrical properties
3 Terms and definitions
This clause of GB/T 4706.1-2024 is applicable, except as follows.
3.1 Definitions relating to physical characteristics
3.1.101
design pressure
gauge pressure that has been assigned to a transcritical refrigeration system
Note : It is specified for the high pressure side of a refrigeration system.
3.1.102
application category
back pressure relative to the evaporation temperature range over which the motor-compressor operates
Note: For the purpose of this standard, the following classifications of application categories are made relative to the maximum evaporation temperature:
——very low back pressure (VLBP): denotes a maximum evaporation temperature of –25 °C;
——low back pressure (LBP): denotes a maximum evaporation temperature of –15 °C;
——medium back pressure (MBP): denotes a maximum evaporation temperature of 0 °C;
——high back pressure (HBP): denotes a maximum evaporation temperature of +15 °C;
——very high back pressure (VHBP): denotes a maximum evaporation temperature of +30 °C;
——subcritical R-744 back pressure (SC R-744BP): denotes a maximum evaporation temperature of –15 °C;
3.5 Definitions relating to types of appliances
3.5.101
motor-compressor
appliance consisting of the mechanical mechanism of the compressor and the motor, both of which are enclosed in the same sealed housing, with no external shaft seals, and with the motor operating in a refrigerant atmosphere with or without oil
Note 1: The housing may be permanently sealed, such as by welding or brazing (hermetic motor-compressor), or may be sealed by gasketed joints (semi-hermetic motor-compressor). A terminal box, a terminal box cover, and other electrical components or an electronic control system may be included.
Note 2: Hereafter, the term motor-compressor will be used to designate either a hermetic motor-compressor or semi-hermetic motor-compressor.
3.5.102
two-stage motor-compressor
motor-compressor comprising two compressors and one motor in a single housing
3.6 Definitions relating to parts of an appliance
3.6.101
housing
sealed enclosure for the motor-compressor, which contains the compressor mechanism and the motor, and which is subjected to refrigerant pressures
3.6.102
starting relay
electrically operated control device intended for integration or incorporation into a motor-
compressor and used within the motor-compressor circuit to control the starting of single-
phase motor-compressors
3.7 Definitions relating to safety components
3.7.101
thermal motor-protector
automatic control, built-in or fitted on a motor-compressor that is specifically intended to
protect the motor-compressor against over-heating due to running overload and failure to start
Note 1: This control carries motor-compressor current and is sensitive to one or both of the following:
——motor-compressor temperature;
——motor-compressor current.
Note 2: The control is capable of being reset (either manually or automatically) when its temperature falls to the reset value.
3.7.102
motor-compressor protection system
thermal motor protector and associated components, if any, or protective electronic circuit
fully or partly separate or integrated into the motor-compressor control system and which is specifically intended to protect the motor-compressor against over-heating due to running overload or failure to start
Note: The control carries motor-compressor current and is sensitive to one or both of the following:
——motor-compressor temperature;
