Three major problems of heat pump water heater and its diagnosis and treatment

Heat pump water heater illness one: set the water temperature or temperature rise slow. However, some engineering units running time more than the design time is still not up to the water temperature, only barely direct use of hot water can not even use the measured temperature of 40 or lower, the system 偱 ring pump kept ring, the temperature did not increase . Diagnosis of a heat pump water heater: air source heat pump hot water unit water temperature is generally set between 50 ℃ ~ 60 ℃, and occasionally higher than 60 ℃ below 65 ℃ also belongs to the allowable range, but operating conditions may affect the life of the unit . The rise in water temperature must get heat from the outside world. When the water tank temperature does not go there will be two possible, on the one hand the heat loss or equal to the influx of heat, when the two are equal, the water temperature unchanged. Loss of heat also includes two possibilities, one is the insulation is not enough quality and the temperature difference between the natural world is too large, heat loss is serious, especially the water tank manhole seal is not strict insulation is not good or hidden insulation part did not do well, the external takeover insulation and the box Discontinuous insulation will increase the heat loss; another loss of heat as hot water out at the same time cold water supplement. This loss of heat often appear in the design of the tank, and some customers require 24 hours of uninterrupted water, such as passenger traffic larger hotels, haircut and other water customers, cold water rushed into the tank, ready to use hot water . In the air source heat pump hot water unit is not a problem, once the weather suddenly cooled, the unit doubled from the calorie in the air to reduce, while customers increased the amount of hot water, then left in the tank of heat is not enough, On the performance of the water temperature rise difficulties, and even cold water phenomenon. On the other hand, it may be that the host refrigerant has poor heat carrying capacity, resulting in less effective heat exchange within a single collar. One of them may be improper refrigerant selection. The air-source heat pump hot water unit is different from the traditional air-conditioning refrigerant, and has unique physical and chemical stability. This is also one of the core heat pump technologies. Part of the heat pump products using the market, the refrigerant does not have this feature, in the case of lower temperatures outside the case of fatigue is not surprising. Another possibility is that the charge of the refrigerant is small or partially leaked and becomes less capable of carrying heat. Formal manufacturers of air-source heat pump hot water unit products constant pressure quantitative plus refrigerant, have been tested by the factory one by one to ensure that the host of the compressor in a variety of conditions have a more stable ability to work. The same batch of units to test the status of a single test, to mark the certificate, date of manufacture, number and so on. In the transport of products, there are cases of not moving according to the label, so that part of the refrigerant leak missing, not work, will result in water temperature reaches the design of the water temperature. Heat pump water heaters prescription one: According to our diagnostic analysis should first check to see if daily water consumption is excessive, 1kg of water per 1kg rise in absorption 1Kcal heat equivalent to 1.163 × 10-3KWh, both 1000Kg water up 1 degree, to be absorbed 1.163KWh Heat. The calculation formula is as follows: water quantity (tons) × temperature difference ℃ × 1.163 / unit power Kw × COP value ≤ design working time (hours), for example: cold water temperature is 15 ℃, outlet water temperature is set at 55 ℃, unit power 2.2KW, In winter, when the ambient temperature is low, the COP value is about 2 (data released by the manufacturer of the product) and the designed water consumption is 1 tonne. The working time of the unit is 11 hours. The maximum working time of design is 20 hours. 2 tons, the working hours of the unit is 22 hours <24 hours maximum allowable working time and 3 tons of water under the same working conditions, auxiliary heating or unit configuration should be considered. If there is no problem with the unit configuration, the water circulation between the stand-alone and the water storage tank can be cut off to start the unit to detect the heat collection capacity of the single machine. If the temperature does not reach the highest temperature on the nameplate, the refrigerant may be a problem. Check the refrigerant pressure, control the factory data sheet, if the pressure is insufficient, the performance of the refrigerant loss. According to the original model refrigerant added to the factory standard quantity can be. Heat pump water heater symptoms 2: Unit working time is too long, more than 24 hours of continuous operation, power consumption greatly exceeded the business to the customer's budget, the cost increases or is expected to use the valley price concession plan meaningless, customers on the air source heat pump hot water unit Trust greatly reduced, and even proposed cost compensation. Unit over-long working hours caused by the overload of power distribution components and water ring 增 ring increased, will inevitably lead to a series of chain system problems. Heat pump water heater diagnosis II: air source heat pump hot water unit engineering unit shutdown control by the controller, the unit working time is too long because there is no set system shutdown parameters, such as temperature parameters. The temperature sensor near the water supply port, the detection temperature below a certain range of set value when the unit opens; higher than the set temperature of a certain value, the unit stopped. Exclude the refrigerant with poor heat capacity and setting the temperature is too high and other reasons, then there may be temperature sensor failure or sensing circuit short circuit, circuit breaker led to shutdown. Because the air source heat pump hot water unit production of hot water is a loop heating process, belong to the thermal storage hot water equipment, consider the temperature is low, the heat in the air to reduce the unit to obtain a single 偱 ring less heat, the unit COP value Decline will make the working time of the unit lengthened. In order to avoid the unit matching "small cart pulled cart", to ensure that the unit within 24 hours to obtain sufficient heat, the rated amount of water heating, taking into account the summer unit COP value increases, the system Take hot water capacity, the normal design work time is generally 10 to 15 hours, but from the reality of view, a serious problem of the proportion of units have unreasonable situation in the face. Take the unit with input power of 4kW as an example, when used in Guangdong, proper water distribution should be 3 tons of water. Even when the winter air temperature is extremely low, the COP average is calculated as 2 and the unit works for 17.5 hours 60 ℃ hot water requirements, the actual configuration of some projects with water more than 5 tons, it is no wonder the unit can not be down for a long time. Voltage over and under may also be shut down failure fault, but this situation is less, because under normal circumstances, the unit has the factory before the factory set high and low voltage compressor to protect against voltage over, owe and start running damaged compression machine. A long time non-stop crew there may be a compressor is bad, intermittent operation of the fan unit caused by the illusion of non-stop, this situation is rare, the general heat pump set as the fan bearing compressor power, will not run alone . Heat pump water heater prescription two: First check whether the voltage meets the unit operating requirements, voltage no problem, to see whether the normal operation of the compressor to exclude fan idling caused the illusion of unit operation. Determine the matching of water consumption and unit is appropriate to exclude due to continuous into the cold water temperature and temperature drop caused by increased workload of the unit, check the control system for any fault line sensor, to be excluded. Heat pump water heater illness three: Unit crashes, unable to start. When the temperature drops below 0 ℃, the whole system will enter the shutdown state, even if the temperature rises, still can not start running, or outside machine fan rotation, the compressor stops working. Heat pump water heater diagnosis three: stop the unit is mainly due to the control system, one by one to check the settings of the protection parameters, such as water temperature control circuit, the system can not be collected in the signal will not start, because the unit is turned on by the heat exchanger temperature And set tank temperature and set the temperature of the three parameters jointly controlled when the collected tank temperature is lower than the set temperature when a certain time when the unit starts to start the collector part of the water temperature is higher than the temperature of the tank when a certain value of the ring start, When the collector temperature can not collect data, the unit self-protection does not start. In addition the voltage is too low too high, the refrigerant leak, the compressor low pressure protection or compressor has broken, etc. can cause the unit can not boot. Cold water pressure is not enough, the water tank fill water, the unit will not protect the start. Heat pump water heater prescription three: first check the compressor for damage, with a universal meter to measure the compressor resistance, confirm the compressor without failure, the focus of inspection of the control system, control unit factory manual or engineering system design acceptance report, according to the analysis of the inspection circuit, Waterway, temperature setting parameters and measured data, identify non-compliance and correct accordingly. Solenoid valve control Sheung Shui, check the sensitivity of the water level sensor and the size of the water pressure to determine the problem is not the water level data.

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