Beware: heat pump water heater into the "water separation" errors - heat pump water heater, energy saving - HVAC Industry

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Pump Water heater There are also electrical safety issues

Electric shock is the water heater product one of the most serious security incidents, whether it is heat pump water heater or electric water heater, once the shell occurs in the course of flow electrification phenomena in particular, often in an instant can lead to personal injury, therefore, electrical safety is Most of these products should be attention. Some people think, because there is no similar electric water heater heat pump water heater directly into the water heating element, the so-called "separation of water and electricity", so their security is better than electric water heater is in fact an illusion.

By China's formulation of the provisions of relevant laws, product safety is no threatening personal and property safety of unreasonable risk, guaranteed health and personal and property safety of the national standards, industry-standard products, shall comply with the standards. Heat pump water heater design is based on electrical safety standards are GB4706.1-2005 "Household and similar electrical appliances Part 1: General requirements", GB4706.11-2004 "Household and similar electrical appliances water heaters in special requirements ", GB4706.12-2006" Household and similar electrical appliances Particular requirements for storage-type water heater "and GB4706.32-2004" Household and similar electrical appliances heat pumps, air conditioners and Dehumidifiers Special requirements. " These basic requirements specified in the standard content is a minimum requirement, must all be met, and to ensure that the expected life cycle, heat pump water heater of the basic safety and reliable performance, heat pump water heater is safe.

Provided by GB4706.32-2004, household and similar purposes type of heat pump water heater for the protection against electric shock Class and type electric water heater the same as the corresponding requirements. Protective measures against electric shock of such products is formed in the product of reliable ground network can reach all parts with conductive properties have good ground continuity, for example, any of these components of surface and ground-side resistance of the product value must be less than 0.1 ohms.

Leakage accident in case of such products, if the grounding system failure, will result in products that can be touched all conductive parts, including body and water are charged, obviously, the resulting consequences, for the same use of anti-class heat pump water heaters, electric shock protection measures for safety hazards on the way and the damage degree and electric water heater is considerable. Therefore, measures to ensure reliable and efficient ground. Not necessarily more secure than the electric water heater

Electric heating elements in electric water heaters are usually immersed in water, heating element when the shell due to the influence of such factors as corrosion damage occurred, that led to leakage accident, which is electric water heater caused the highest probability of occurrence of human casualties of fault types ; In addition, other fault types, such as failure of electrical insulation components, including electrical connectors off and other faults may lead to leakage accidents.

Compared with electric water heater, using the basic configuration of the heat pump water heater is usually bigger number of electrical components, even though a separate examination of these components insulation failure probability, electric water heater than the probability of leakage in the lower heating element, however, Compressor Motor The insulation also may be due to high temperature aging Refrigerants Mixture of metamorphic and lubricants, and other reasons, invasive solid particles and void Fans Motor, Solenoid valve Coil is also a high probability of occurrence of insulation failure of components. Therefore, the overall heat pump system is not necessarily the insulation failure probability will necessarily lower than the electric water heater.

Heat pump water heater safety standard GB4706.32-2004 section 24.1.2 shall give some components life test requirements: one, since the reset thermal Release of 3000 times; compressor controller 10 million; compressor Relay 10 million; fully closed and semi-hermetic compressor thermal protector automatically inferior to at least 2000. Even so, these are the basic requirement is not fully required, but not all of the requirements in product design and development process, should a similar life to be a reasonable request or reliability considerations.

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