Global one-stop procurement platform for industrial spare parts.
support01@okmarts.com service@okmarts.com hydraulic@okmarts.com
Display the website inEN
EN
translate to EN
EN
translate to ES
ES
translate to العربية
العربية
All
Omron
Omron
Allen Bradley
Allen Bradley
LS
LS
Siemens
Siemens
Beckhoff
Beckhoff
Delta
Delta
All Brands
All Brands
    • a
    • b
    • c
    • d
    • e
    • f
    • g
    • h
    • i
    • j
    • k
    • l
    • m
    • n
    • o
    • p
    • q
    • r
    • s
    • t
    • u
    • v
    • w
    • x
    • y
    • z
    • 3
    • 7

    Air-conditioning compressor failure judgment and case analysis

    Air-conditioning compressor failure judgment and case analysis The compressor is the energy core of the air conditioning refrigeration (heat) system. In the refrigeration system, it mainly compresses the refrigerant and promotes the continuous circulation of the refrigeration oil. In the air conditioning system, the compressor can be divided into three types: reciprocating, rotary and scroll. Among them, the reciprocating application in the early air-conditioning has been eliminated. At present, the rotary type and the scroll type are mostly used. 1. Analysis and treatment of air conditioner compressor fault judgment method 1. The compressor motor is damaged: First, the wiring of the compressor terminal is incorrect and burns the motor; Second, the system refrigerant leakage; The high-pressure gas of the rotary compressor discharges the compressor and is also responsible for taking away the heat generated by the motor. If the system refrigerant leaks, only a small amount of high-pressure gas will be discharged from the compressor, so that the heat generated by the compressor motor when it is energized will always be collected. Over time, the compressor motor will be burned. When the compressor is locked, the motor factor should be excluded as much as possible, so the insulation resistance of the motor and the windings of the main and auxiliary coils must be measured to determine whether the motor is burned. 2. Compressor capacitance problem: First, the capacitor is damaged (short circuit, open circuit); Second, the capacitor specifications do not match the compressor. Note: This item only applies to single-phase compressors. Because a three-phase induction motor is used in the three-phase compressor, a three-phase alternating current is passed through the stator core to generate a rotating magnetic field, so a capacitor is not required. 3. The frequent thermal protection of the compressor: First, the thermal protector is abnormal; you can refer to the specifications provided by the compressor manufacturer for the performance chart and text description of this item; Second, the wiring of the power cord is unreasonable (the wiring of the compressor terminal is incorrect, or the inverter of the inverter air conditioner is running without phase: that is, check the current between the three phases to see if there is a short circuit or open circuit), low voltage start; Third, the high and low pressure of the system starts before it is balanced; it is generally required to turn on the air conditioner at least 3 minutes after it is turned off; it may also be that the capillary flow of the system is too small, and the high and low pressures cannot be balanced as soon as possible; Fourth, liquid shock caused by liquid return, long-term shutdown start, low ambient temperature start and other reasons. Under the condition of long-term shutdown and low temperature, the refrigerant in the compressor dissolves in the refrigerating machine oil, so that the liquid level (mixed liquid of liquid refrigerant and lubricating oil) rises. When starting, the liquid refrigerant in the closed shell Evaporation from dissolved lubricating oil produces strong foaming. 4. The compressor is copper-plated or rusty, that is, the system has entered water: Refrigeration systems have strict requirements for moisture. Generally, the moisture content in refrigeration systems is less than 0.2ml. If moisture enters the compressor, it will cause the following serious harm to the compressor: First: The mechanical parts of the compressor are copper-plated and rusty. When the copper plating and rust reach a certain level, the matching gap between the mechanical parts of the compressor will be reduced, and in serious cases, the compressor may be blocked. Second, the motor coil paint film, insulation materials, etc. are corroded, resulting in a short circuit of the motor; Third, the deterioration of refrigerant and refrigeration oil; Fourth, the leaf spring is brittle and broken; In general, the intrusion of moisture may be caused by incomplete vacuuming or leakage of refrigerant on the low-pressure side of the system. 5. Abnormal wear of compressor: First, the gap between the internal components of the compressor is small, which is generally a problem of the compressor itself; Second, the problems of frozen oil, such as: poor oil return hole; insufficient oil volume; oil carbonization and deterioration, poor oil return, etc. Refrigerating oil plays a lubricating role inside the compressor, which can effectively prevent the wear of mechanical parts of the pump body, and its oil seal can maintain the pressure difference between high and low pressure, avoid high and low pressure cross-flow, and prevent the cooling capacity from falling. In addition, due to the continuous circulation of refrigeration oil, it can also take away the heat generated between the friction surfaces in time. When the amount of refrigeration oil is insufficient, the mechanical parts inside the compressor will be abnormally damaged due to the lack of timely lubrication, and eventually the compressor will stall. There are several reasons for the poor oil return of the system: First, the length and drop of the indoor and outdoor connecting pipes exceed the specified value; generally, the indoor and outdoor connecting pipes should not exceed 15m, and the maximum drop is 5m. Second, the capillary of the system is clogged or the selection is unreasonable and the liquid separation of the indoor heat exchanger is uneven. As a result, the refrigerant does not fully evaporate and then returns to the compressor. Because it is not completely evaporated, the flow rate is relatively slow. The wall of the heat exchanger tube causes poor liquid return, which also affects the improvement of system capacity and fluctuations. Third, the leakage of the system refrigerant takes away the freezing oil, and the failure to replenish the freezing oil when supplementing fluorine causes poor oil return to the system. 6. Foreign matter enters the compressor: Impurities carried by the compressor itself and impurities brought by the air conditioner system. Second, the air conditioning system failure case Case 1: The extension tube is not added or the refrigerant is excessive. Description of the problem: 4 sets of 5 hp cabinets newly installed in a factory are not regularly reported failure of high temperature protection of exhaust pipe. The user thinks it is a batch problem of the machine and requires the manufacturer to assist in handling. On-site verification: After arriving at the site, four cabinets were found to be about 8-10 meters long, asking the master if there was a leak detection and additional refrigerant during installation. The answer was that the leak was not found, but no refrigerant was added. Analysis of the reason: when no refrigerant is added to the extended connecting pipe, it is equivalent to the lack of fluorine in the system. The lack of fluorine in the system will lead to insufficient oil return, poor lubrication of the scroll, the center temperature rises, and the exhaust temperature is high. When protecting the value, the machine displays E4 protection. On-site treatment: On-site quantitative addition: 50g × 8 = 400g refrigerant, exhaust temperature returned to 88 degrees, observed for a period of time, there is no exhaust pipe high temperature protection. Case 2: The indoor and outdoor units have a large drop and frequent machine protection. On-site verification: An elementary school installed more than 10 sets of 5 machine cabinets, two of which often exhibited abnormal protection. The door-to-door inspection found that the difference between the inside and outside of the two sets of machines was about 8 meters. There is no oil bend in the connecting pipe. Reason analysis: Since the external machine is 8 meters higher than the internal machine, the lubricating oil must overcome the greater gravity in the circulation to return the oil. The greater the drop between the internal and external machines, the harder it is to return oil, and the lack of oil will cause frequent compressor protection or failure . Treatment method: For machines with a drop of more than 5 meters, the oil return bend must be set at a distance of no more than 5 meters. The oil return bend can be set to "U" or "return" type. Case 3: Improper installation of the pipeline collapses and the indoor unit makes noise. On-site verification: A 3 hp cabinet was installed in the office of a unit, and it has been feedbacking howling for a certain period of time. inspect on the spot: a: Observation after starting, the compressor makes a howling sound 1 minute after starting, the sound changes from small to large, and the sound becomes smaller for about 2 minutes, but the howling sound can still be heard. b: After investigation, it was found that the position of the suction pipe of the indoor unit connection tube was flattened, and howling sounds when the low-pressure pressure at start-up dropped to 6-7 kg. When the low-pressure pressure was balanced at 5.5 kg, the howling sound disappeared. Case 4: User voltage is unstable. On-site verification: The newly installed 3 pylons will be noisy after 3 minutes of operation, and the fault remains after the compressor is replaced. It was found on site that the compressor voltage dropped from 198V to 173V 2 minutes after the compressor was started. At this time, the compressor began to emit a "buzzing" sound and then stopped running. Reason analysis: The user's power supply voltage is too low and the compressor cannot start normally. It is recommended that the user install a regulator to deal with it. Case 5: Leakage of refrigerant. One outlet reported that a restaurant installed a 5-horse cabinet machine, used three years to replace three compressors, and said a few days ago that no refrigeration. On-site verification: On-site inspection, it was found that the compressor does not start, and the resistance of the terminals U, V, W is about 6O ohms, which is normal. Start the compressor forcibly, hear the buzzing sound, judge the compressor to be stuck. Reason analysis: There is a lot of oil on the valve of the outdoor unit. Remove the small take-up nut and find that the small tube bell mouth is cracked. The analysis is that the nut fixing force is too large during the second maintenance to cause the bell mouth to crack and cause system refrigerant leakage. On-site treatment: put the refrigerant, pour out the compressor oil and observe, the oil color is very dark. The compressor oil is nearly black, indicating that the system has been seriously dirty. At the same time, because the storage tank is difficult to clean, the compressor and the storage tank are replaced simultaneously, and the system is flushed with nitrogen and refrigerant. Back to normal. The above-mentioned compressor fault diagnosis and case analysis hope to be helpful for everyone's future maintenance work.

    Recent related posts

    Air-conditioning compressor failure judgment and case analysis

    06/14/2020

    Air-conditioning compressor failure judgment and case analysis

    The compressor is the energy core of the air conditioning refrigeration (heat) system. In the refrigeration system, it mainly compresses the refrigerant and promotes the continuous circulation of the refrigeration oil. In the air conditioning system, the 器2䀀ￜ皥䖒皦즠Ʋ奌ི㲈Ʋ䌁皦ᮔDž༬皧奖ིЀ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ￿￿뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥巠皱㙲皦抐皱巠皱੨皦柘皱ￜ皥ب巠皱㙲皦忈皱੨皦柘皱즠Ʋǜ勁皦즠ƲبǜV /펔B䌁皦

    After the Mitsubishi air conditioner is turned on, the indoor compressor does not rotate and cannot be cooled

    06/14/2020

    After the Mitsubishi air conditioner is turned on, the indoor compressor does not rotate and cannot be cooled

    Fault phenomenon: After a Mitsubishi SRC285cENF air conditioner is turned on, the indoor fan operates normally, and the indoor compressor does not rotate and cannot be cooled.

    Analysis of the causes of air compressor operation failure

    06/14/2020

    Analysis of the causes of air compressor operation failure

    The main medium conveyed by the air compressor is air, which provides compressed air to the ventilator, which is the basic condition for keeping the ventilator working normally. The main part of the air compressor is generally composed of driving steam tu器2䀀ￜ皥䖒皦즠Ʋ奌ི㲈Ʋ䌁皦ᮔDž༬皧奖ིЀ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ￿￿뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥巠皱㙲皦抐皱巠皱੨皦柘皱ￜ皥ب巠皱㙲皦忈皱੨皦柘皱즠Ʋǜ勁皦즠ƲبǜV /펔B䌁皦 ᮔDž'鱤džၜ먢䇨珵呈ᠾ뤂ᐱ⿇⬿먲僧ᐱ㥲ᐲ�僬㣢ᐲᠾ랖僧׼識�僬㣢ᐲ臆S㥲ᐲᬄğ識理艏S杴 識杴 㥲ᐲ

    Is there any difference between refrigeration compressor, air compressor and air pump

    06/14/2020

    Is there any difference between refrigeration compressor, air compressor and air pump

    Air compressor ≠ refrigeration compressor. Refrigeration compressor: It is a driven fluid machinery that raises the bottom pressure vapor to high pressure vapor. There are many types, such as nitrogen making equipment, refrigerant machine, air compress器2䀀ￜ皥䖒皦즠Ʋ焬क़㲈Ʋ䌁皦ᮔDž༬皧然क़Ѐ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁

    Two methods of evacuating the refrigeration system

    06/14/2020

    Two methods of evacuating the refrigeration system

    Vacuuming is an indispensable important process before charging refrigerant in the production or maintenance of refrigeration equipment. That is, the process of removing the non-condensable gas and moisture in the system pipeline by connecting the vacuum 器2䀀ￜ皥䖒皦즠Ʋ奌ི㲈Ʋ䌁皦ᮔDž༬皧奖ིЀ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ￿￿뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘

    What to do if the screw chiller compressor is damaged

    06/14/2020

    What to do if the screw chiller compressor is damaged

    The compressor is the core component of the chiller. Damage to the compressor is a serious fault that needs to be dealt with in time, otherwise the chiller will not work. Today, the editor will introduce the knowledge and process of handling damaged screw器2䀀

    Will the compressor car refrigerator affect the car

    06/14/2020

    Will the compressor car refrigerator affect the car

    The weather has recently become hot. Many friends came to me and asked me how to get an Indell compressor car refrigerator on the car? Will it affect the car battery? I thought it would be the same. When the demand for car refrigerators is getting hotter,器2䀀ￜ皥䖒皦즠Ʋ奌ི

    Is it necessary to replace the refrigerator compressor? How much does it cost to replace the refrigerator compressor?

    06/14/2020

    Is it necessary to replace the refrigerator compressor? How much does it cost to replace the refrigerator compressor?

    The refrigerator is a good helper in everyone's life, the main function is to keep food fresh, and then the freezing area can also enlarge the ice cream and ice cream that you like to eat in summer. But when the refrigerator compressor is broken, it is ve器2䀀ￜ皥䖒皦즠Ʋ焬क़㲈Ʋ䌁皦ᮔDž༬皧然क़Ѐ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ￿￿뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥巠皱㙲皦抐皱

    How to choose the matching type of cold storage

    06/14/2020

    How to choose the matching type of cold storage

    A, high temperature cold storage (± 5 ℃): suitable for the preservation of fruits and vegetables; B. Medium temperature cold storage (-10 ℃ ~ -5 ℃): suitable for food refrigeration after freezing; C, low temperature cold storage (-20 ℃ ~ -10 ℃): sui器2䀀ￜ皥䖒皦즠Ʋ奌ི㲈Ʋ䌁皦ᮔDž༬皧奖ིЀ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ￿￿뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥巠皱㙲皦抐皱巠皱੨皦柘皱ￜ皥ب巠皱㙲皦忈皱੨皦柘

    Design and selection of compressor unit for mobile cold storage

    06/14/2020

    Design and selection of compressor unit for mobile cold storage

    1. Regardless of the brand selection of the compressor unit, it is determined according to the evaporation temperature of the active cold storage and the effective working volume of the cold storage. In addition, the condensation temperature of the frozen器2䀀ￜ皥䖒皦즠Ʋ焬क़㲈Ʋ䌁皦ᮔDž༬皧然क़Ѐ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ￿￿뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ

    Customers frequently viewed

    New In stock for sale, IWAYA DENKI Water Pump 25CJT0752

    IWAYA DENKI Water Pump 25CJT0752
    US$2307.69
    New In stock for sale, Panasonic Servo Motor MHMF022L1V2M

    Panasonic Servo Motor MHMF022L1V2M
    US$653.85
    New In stock for sale, Honeywell Solenoid Valve VE4025B1045

    Honeywell Solenoid Valve VE4025B1045
    US$334.62
    New In stock for sale, ROTEN Mechanical Seal 8E5K-22-X

    ROTEN Mechanical Seal 8E5K-22-X
    US$384.62
    New In stock for sale, TOKYO KEIKI TOKIMEC Solenoid Valve DG4V-3-0B-M-P2-B-7-56

    TOKYO KEIKI TOKIMEC Solenoid Valve DG4V-3-0B-M-P2-B-7-56
    US$341.54
    New In stock for sale, Copeland Compressor ZB76KC-TFS-230

    Copeland Compressor ZB76KC-TFS-230
    Contact Us
    New In stock for sale, Allen Bradley PLC 5069-L340ERMS2

    Allen Bradley PLC 5069-L340ERMS2
    Contact Us
    New In stock for sale, ZHONGDA Electric Motor 6IK180GU-S3F

    ZHONGDA Electric Motor 6IK180GU-S3F
    US$107.69
    New In stock for sale, IFM Sensor IT5055

    IFM Sensor IT5055
    Contact Us
    New In stock for sale, Teco TAIAN VFD Frequency Converter A510-5001-H-UE

    Teco TAIAN VFD Frequency Converter A510-5001-H-UE
    Contact Us
    New In stock for sale, E+H Flowmeter 50P15-EA0B1AA0CBAA

    E+H Flowmeter 50P15-EA0B1AA0CBAA
    US$1923.08
    New In stock for sale, Bock Compressor AZ

    Bock Compressor AZ
    US$3306.15
    New In stock for sale, HENGSTLER Encoder RI76TD/10000AD.1A40TF

    HENGSTLER Encoder RI76TD/10000AD.1A40TF
    Contact Us
    New In stock for sale, Ebmpapst Fan A3G315-AA76-01

    Ebmpapst Fan A3G315-AA76-01
    Contact Us

    • Welcome to O&Kmarts

      Is there anything we can help?

      Email us
    © eCommerce. 2017-2025. All Rights Reserved
    Press and drag the mouse to start taking a screenshot