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    Home > Active Ingredient News > Drugs Articles > Analysis of 17 common failures of air energy heat pump

    Analysis of 17 common failures of air energy heat pump

    • Last Update: 2019-04-03
    • Source: Internet
    • Author: User
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    Nanjing haizhizhou cooling and heating equipment Co., Ltd analyzes the common faults of air source heat pump as follows: 1 Phase sequence, lack of phase and reverse phase protection Fault analysis: use a multimeter to check whether there is 380V voltage between the three-phase power supply phases of the circuit board If there is, the fault may be reverse phase protection The two adjacent incoming lines of the power supply connected to the unit can be exchanged According to experience, most of the lines are reversed; otherwise, the fault may be phase loss protection Check whether the power supply or the incoming line is reliable 2 Fault analysis of water flow protection: water flow protection fault is common in all engineering installations Regardless of installation, there are two possibilities for water flow protection: the non circulation of water system and the damage of water flow switch itself Water flow failure is often caused by waterway problems Check and clean whether there is any problem with the pipeline filter, check whether the pipeline valve and circulating pump are damaged or open; if they are all normal, it is the fault of the water flow switch itself, which can be short circuited to see whether it is started, if it can be started, it is the problem of the water flow switch 3 Fault analysis of outlet overheat protection: whether the actual temperature of the water tank exceeds the set temperature; whether the position of the water tank sensor is incorrect or the water tank sensor does not contact the blind pipe wall closely The connection of water tank temperature sensor is broken or the resistance value of temperature sensor drifts Check the set temperature and temperature probe Check whether the water temperature value is consistent with the actual value If the temperature is consistent, replace the probe if it is broken If none of this is a problem, you need to look at the motherboard 4 High pressure protection fault analysis: confirm that the high pressure of the system is indeed too high through the pressure gauge, indicating that there is a fault in the water circuit, which may include: the actual flow of the circulating water pump is too small; the valve or filter in the water circuit is blocked; the valve is not fully opened; the water temperature is set too high; the heat exchanger is scaling blocked; there is air in the water system; the water system is short of water If the high pressure of the system does not reach the alarm pressure, check whether the wiring of the pressure switch is reliable and plug the wiring again After shutdown, use a multimeter to check whether the high-pressure switch is on If not, the pressure switch may be broken 5 Low voltage protection fault analysis: this fault is quite common In case of this fault, the first consideration is the lack of fluorine and leakage of fluorine In addition, check whether the defrosting of the unit is poor If the unit fins are frosted seriously, check whether the fan has problems, and the fan failure will easily cause frosting And the evaporator is not cleaned for a long time, which is also prone to low pressure fault It can be tested whether the low-pressure pressure is too low under the shutdown state If it is lower than 0.5MPa, it is important to find out whether the fluorine circuit has leakage point or blockage; if it is higher than 0.5MPa, it is important to check the low-pressure protection switch and expansion valve After shutdown, use a multimeter to check whether the low-pressure switch is on If not, the pressure switch may be broken 6 Fault analysis of over high exhaust temperature protection: when the unit is running, check whether the exhaust temperature value is consistent with the actual temperature, and check whether the exhaust temperature exceeds 120 ℃ The exhaust temperature is not high The exhaust temperature sensor may be damaged, the contact may be poor or the circuit board may be damaged If the exhaust temperature is too high, check whether the high and low pressure are normal, whether the expansion valve is slightly blocked, whether the unit is lack of fluorine, whether the four-way valve is in series, whether the compressor is in series, whether the refrigerant pipeline is blocked 7 Analysis of the failure of the water level switch: the common causes are the reverse connection of the high and low water levels, the poor connection of the low water level device, and the main board failure 8 Communication failure analysis: check whether the shield wire is disconnected in the middle and whether the two ends are in poor contact when they are plugged in If the disconnection contact is poor, the fault point can be determined by re plugging and replacing the control panel, shielding wire and circuit board In addition, if the communication wire is not copper core wire, or the control board is damped, communication failure may occur 9 Fault analysis of temperature sensor: first, check whether the connector of the probe on the main board side is secure and whether the main board has problems If there are no problems, it means that the corresponding temperature sensor is either short circuited or open circuited Check the resistance of the corresponding sensor probe When the temperature is 25 ℃, the normal resistance of the sensor is about 5K Ω (the exhaust temperature sensor is 80 ℃, 50K Ω) If the resistance value is normal and it is not OK after re plugging and confirming, it can be judged as circuit board fault 10 No display fault analysis on the display screen of the control panel: check whether there is no power, and check whether the fuse of the equipment is blown normally If all of these are normal, check whether there is a problem on the main board or the display 11 Fault analysis of low outlet water temperature: Check whether the outlet water temperature value is consistent with the actual temperature, if not, replace the outlet water temperature probe; if it is consistent with the actual temperature, check whether the water tank temperature value is consistent with the actual value (if the water tank temperature control machine works), check and clean the pipeline filter, check whether the pipeline valve is damaged and open, and check whether the circulating pump meets the flow requirements of the unit, yes No normal operation 12 Failure analysis of the main engine not running: first, make sure that the parameters of the unit are set correctly, then check whether the power supply is faulty; check whether the compressor contactor is faulty, and whether the wires are tight In addition, if the compressor operates at high load for a long time, overheating protection will occur 13 Low heating capacity Fault analysis: poor heat dissipation of air heat exchanger, cleaning of air heat exchanger; insufficient water flow, cleaning of filter; insufficient refrigerant injection, leakage detection and injection of quantitative working medium; fan motor failure, severe frosting of evaporator; poor insulation of pipeline, re insulation of pipeline; blocking of unit refrigerant system, detection of blocked components; compressor problem, replacement of compressor 14 Failure analysis of unclean defrosting: the coil probe falls off, check whether the temperature sensing position of the coil probe is accurate and damaged; the defrosting parameter setting is inaccurate, readjust the defrosting parameter; the system is lack of refrigerant 15 Failure analysis of the fan not turning: the fan motor is burnt out, replaced or repaired; the contactor is broken, replace the contactor; the fan capacitance is broken, replace the capacitance; there is no start signal, and the main board fan has no start signal 16 Failure analysis of water pump not starting: judge whether the water pump is stuck It is very difficult to touch the pump by hand or turn the fan blade with a screwdriver to prove that the pump shaft is stuck The treatment method is to turn the pump fan with a slotted screwdriver The water pump shaft needs to be replaced or repaired The main board water pump has no output signal Use the voltage range of the multimeter to directly measure whether the load port of the water pump has output No output proves that the main board has problems Just replace the main board If the water pump relay is burnt out, use the ohm gear of the multimeter to measure the normally open port of the water pump relay When the measured resistance value is infinite, it is proved that the relay is damaged Of course, it can be judged whether it is burnt out by visual inspection Only one relay needs to be replaced to make the water pump operate normally 17 Air switch trip fault analysis: if the air switch fails to close, replace an air switch and ensure that the line is not connected falsely If not, it may be that the compressor is grounded or there is a short circuit on the main board After accurate judgment, replace the compressor or the main board Air switch occasionally trips, which is often caused by the virtual connection of air switch line It is important to check whether the line is firmly connected Of course, if the air is opened in a place with high humidity, it may be damped and trip
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