First, overhaul and maintenance project classification<\/p>\n\n\n\n

(A) System maintenance:<\/p>\n\n\n\n

1, air conditioner, fan coil maintenance; 2, air conditioning main unit maintenance;<\/p>\n\n\n\n

3, terminal equipment maintenance service;<\/p>\n\n\n\n

4, air conditioning cooling tower maintenance service.<\/p>\n\n\n\n

\n
• Cleaning:<\/li>\n<\/ul>\n\n\n\n

  1, refrigeration unit, cooling tower, hot and cold water system, air conditioning system, circulating water system;<\/p>\n\n\n\n

  2, heat exchange equipment, condenser, evaporator, cooling water system, refrigerant water system in the cold unit;<\/p>\n\n\n\n

  3, fan coil surface cooler, condensate pipeline equipment.<\/p>\n\n\n\n

  \n
  • Maintenance:<\/li>\n<\/ul>\n\n\n\n

    1, air conditioner, fan coil maintenance;<\/p>\n\n\n\n

    2, host system: compressor, vacuum valve, sight mirror, shield pump, real pump, heat transfer tube, condenser, evaporator, automatic control element;<\/p>\n\n\n\n

    3, cooling tower: fan, bearing, water distributor, filter, film material, tower parts, etc Two, maintenance cycle<\/p>\n\n\n\n

    \n
    • Daily\u00a0repair\u00a0and\u00a0maintenance<\/li>\n<\/ul>\n\n\n\n

      time<\/strong><\/strong><\/td>	position<\/strong><\/strong><\/td>	Inspection <\/strong>items<\/strong><\/strong><\/td>	correct <\/strong>value<\/strong><\/strong><\/td><\/tr>
      Before <\/strong>startup<\/strong><\/strong><\/td>	1. Oil <\/strong>heater<\/strong><\/strong><\/td>	Check<\/strong> <\/strong>if<\/strong> <\/strong>the<\/strong> <\/strong>electric<\/strong> <\/strong>heater<\/strong> <\/strong>is<\/strong> <\/strong>powered<\/strong> <\/strong>on<\/strong> <\/strong>when<\/strong> <\/strong>stopping<\/strong><\/strong><\/td>	Turn on the electric <\/strong>heater<\/strong><\/strong><\/td><\/tr>
      2. Oil separator sight <\/strong>glass<\/strong><\/strong><\/td>	Check the oil <\/strong>level<\/strong><\/strong><\/td>	Ensure<\/strong> <\/strong>that<\/strong> <\/strong>the<\/strong> <\/strong>oil<\/strong> <\/strong>level<\/strong> <\/strong>is<\/strong> <\/strong>above<\/strong> <\/strong>1\/3<\/strong> <\/strong>of<\/strong> <\/strong>the<\/strong> <\/strong>sight<\/strong> <\/strong>glass<\/strong><\/strong><\/td><\/tr>
      Manual shut-off valve on the spray <\/strong>pipe<\/strong><\/strong><\/td>	Check if the valve is fully <\/strong>open<\/strong><\/strong><\/td>	Open the <\/strong>valve<\/strong><\/strong><\/td><\/tr>
      4 Power Supply <\/strong>Voltage<\/strong><\/strong><\/td>	Check with a <\/strong>voltmeter<\/strong><\/strong><\/td>	Not exceeding \u00b1 10% of the rated <\/strong>value<\/strong><\/strong><\/td><\/tr>
      5<\/strong> <\/strong>Environmental<\/strong> <\/strong>temperature<\/strong> <\/strong>(outdoor<\/strong> <\/strong>temperature)<\/strong><\/strong><\/td>	Check the <\/strong>thermometer<\/strong><\/strong><\/td>	\u226440<\/strong>\u2103<\/td><\/tr>
      Start <\/strong>up<\/strong><\/strong><\/td>	Mirror covered on one <\/strong>side<\/strong><\/strong><\/td>	Check the rotation of the star <\/strong>wheel<\/strong><\/strong><\/td>	Connect according to EY302947 <\/strong>normally<\/strong><\/strong><\/td><\/tr>
      Electromagnetic valve on spray pipe <\/strong>2<\/strong><\/strong><\/td>	Check if it is turned on at <\/strong>startup<\/strong><\/strong><\/td>	<\/td><\/tr>
      3 Vibration and <\/strong>noise<\/strong><\/strong><\/td>	Feeling and <\/strong>listening<\/strong><\/strong><\/td>	No abnormal vibration or <\/strong>noise<\/strong><\/strong><\/td><\/tr>
      function<\/strong><\/strong><\/td>	1. Oil separator sight <\/strong>glass<\/strong><\/strong><\/td>	Check the oil <\/strong>level<\/strong><\/strong><\/td>	Supplement refrigeration <\/strong>oil*<\/strong><\/strong><\/td><\/tr>
      Mirror with two side <\/strong>covers<\/strong><\/strong><\/td>	Check if there is fuel <\/strong>injection<\/strong><\/strong><\/td>	<\/td><\/tr>
      3 Exhaust <\/strong>pressure<\/strong><\/strong><\/td>	Check the high-pressure gauge <\/strong>(exhaust)<\/strong><\/strong><\/td>	1.1~1.8MPa<\/strong><\/strong><\/td><\/tr>
      4. Inhalation <\/strong>pressure<\/strong><\/strong><\/td>	Check the low pressure gauge <\/strong>(suction)<\/strong><\/strong><\/td>	0.30.6MPa<\/strong><\/strong><\/td><\/tr>
      5 suction pressure <\/strong>difference<\/strong><\/strong><\/td>	Check the low pressure gauge <\/strong>(suction)<\/strong><\/strong><\/td>	\u22640.05MPa<\/strong><\/strong><\/td><\/tr>
      1.<\/strong> <\/strong>Hot<\/strong> <\/strong>water<\/strong> <\/strong>outlet<\/strong> <\/strong>temperature<\/strong> <\/strong>(during<\/strong> <\/strong>heating)<\/strong><\/strong><\/td>	Check the <\/strong>thermometer<\/strong><\/strong><\/td>	30~45<\/strong>\u2103<\/td><\/tr>
      2.<\/strong> <\/strong>Temperature<\/strong> <\/strong>of<\/strong> <\/strong>chilled<\/strong> <\/strong>water<\/strong> <\/strong>outlet<\/strong> <\/strong>(during<\/strong> <\/strong>refrigeration)<\/strong><\/strong><\/td>	Check the <\/strong>thermometer<\/strong><\/strong><\/td>	5~10<\/strong>\u2103<\/td><\/tr>
      3. High and low pressure <\/strong>difference<\/strong><\/strong><\/td>	Check the high-pressure gauge <\/strong>(exhaust)<\/strong><\/strong><\/td>	0.1MPa<\/strong><\/strong><\/td><\/tr>
      Every <\/strong>season<\/strong><\/strong><\/td>	1. Refrigerant injection <\/strong>amount<\/strong><\/strong><\/td>	Check the liquid <\/strong>microscope<\/strong><\/strong><\/td>	Pipeline liquid without <\/strong>bubbles<\/strong><\/strong><\/td><\/tr>
      2. Lubricating oil injection <\/strong>amount<\/strong><\/strong><\/td>	Check the oil level <\/strong>gauge<\/strong><\/strong><\/td>	Within the prescribed <\/strong>scope<\/strong><\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n \n body\u00a0maintenance\u00a0cycle<\/li>\n<\/ul>\n\n\n\n <\/figure>\n\n\n\n Note:\u00a0\u25b3\u00a0Inspection\u00a0or\u00a0cleaning,\u00a0\u25cb\u00a0replacement According to the maintenance \u00a0cycle \u00a0of\u00a0the\u00a0above\u00a0table, when\u00a0it\u00a0is\u00a0necessary\u00a0to\u00a0replace\u00a0the\u00a0air\u00a0conditioning piston ring or\u00a0bearing, it\u00a0should be\u00a0implemented by the technical personnel\u00a0approved by the compressor manufacturer or sent by the compressor manufacturer to assist the service.<\/p>\n\n\n\n Three, maintenance key projects<\/p>\n\n\n\n \n Power\u00a0supply\u00a0and\u00a0control\u00a0part<\/li>\n<\/ul>\n\n\n\n 1,\u00a0the\u00a0working\u00a0power\u00a0supply\u00a0of\u00a0the\u00a0unit\u00a0is\u00a03N~,\u00a0AC380V,\u00a050Hz. Need\u00a0to\u00a0check\u00a0the\u00a0electric\u00a0control\u00a0cabinet in the power supply part and control part of the abnormal and fixed terminals, including the total power wiring copper bar, automatic air circuit breaker (air switch), \u03b4-\u03b4or Y-\u03b4compressor start electrical device, PLC\u00a0touch\u00a0screen,\u00a0target\u00a0flow\u00a0switch,\u00a0freezing,\u00a0cooling\u00a0water\u00a0pump\u00a0linkage\u00a0control\u00a0line\u00a0(control\u00a0contact\u00a0 for passive contact), temperature sensor, freezing, cooling water pump, Cooling tower linkage control line (control contact is passive contact), electronic control instrument and so on nodes.<\/p>\n\n\n\n 2,\u00a0check the\u00a0power supply\u00a0 voltage: the\u00a0maximum\u00a0allowable phase\u00a0voltage \u00a0imbalance\u00a0is\u00a02%, and the phase current \u00a0imbalance\u00a0is\u00a010%. Phase\u00a0voltage imbalance\u00a0is\u00a0greater than\u00a02%, absolutely can not be turned\u00a0on. <\/p>\n\n\n\n For example: the nominal voltage is 3N~, AC380V, 50Hz, measured UAB=376V, UAC=379V, UBC=385V. Get the average voltage = (376+379+385) \/3= 380V: Determine the deviation from the average voltage:<\/p>\n\n\n\n \u25b3UAB=380-376=4V, \u25b3UAC=380-379=1V, \u25b3UBC=385-380=5V, the maximum deviation value is 5V, 5\/380=1.3%, the maximum phase voltage unbalance is 1.3%.<\/p>\n\n\n\n Please inform the user that the damage caused by startup operation when the phase voltage unbalance is greater than 2% is regarded as improper operation and is not covered by the warranty of this product.<\/p>\n\n\n\n \n Operation\u00a0and\u00a0appearance\u00a0of\u00a0the\u00a0system\u00a0(leakage,\u00a0damage)<\/li>\n<\/ul>\n\n\n\n \n Confirm\u00a0that\u00a0the\u00a0system\u00a0is\u00a0not\u00a0leaked.<\/li>\n<\/ol>\n\n\n\n \n Check\u00a0that\u00a0the\u00a0sequence\u00a0of\u00a0actions\u00a0is\u00a0normal.<\/li>\n<\/ul>\n\n\n\n 3, check whether the compressor wiring is correct or loose.<\/p>\n\n\n\n 4. Measure whether the working current of each compressor is normal.<\/p>\n\n\n\n 5, check whether it is correctly installed, and confirm that the flow switch and the control cabinet have been correctly connected.<\/p>\n\n\n\n 6, point chilled water, cooling water pump and cooling tower fan, check the motor phase sequence.<\/p>\n\n\n\n 7. Check whether the coil of the compressor capacitive solenoid valve is locked, and whether the capacitive capillary is damaged.<\/p>\n\n\n\n 8, check the water side of the pressure gauge and thermometer connection is correct, flow switch is normal.<\/p>\n\n\n\n 9, check whether the oil level in the compressor is normal, the normal compressor oil level is generally in the middle of the sight mirror.<\/p>\n\n\n\n 10, all the system (condenser outlet Angle valve, compressor suction, exhaust stop valve, etc.) in the open state.<\/p>\n\n\n\n 11. Check whether the high and low pressure Settings of the pressure relay are normal (high pressure is set to 1.8MPa, low pressure 0.2MPa).<\/p>\n\n\n\n 12, check whether the cooling tower\/expansion tank water supply device is smooth, whether the automatic exhaust valve can automatically exhaust.<\/p>\n\n\n\n 13, confirm whether the unit has abnormal noise. There is no contact, collision or friction between pipes and pipes to protect and clean.<\/p>\n\n\n\n 14, check the frame and other metal shell such as rust, with coarse sandpaper and cloth to wipe rust spots apply anti-rust paint.<\/p>\n\n\n\n 15, adjust the water flow and check whether the water pressure drop through the evaporator and condenser meets the requirements of the normal operation of the unit. That is, the inlet and outlet pressure of the chilled water and the inlet and outlet pressure of the cooling water of the unit should be guaranteed at least 0.2MPa<\/p>\n\n\n\n \n The\u00a0use\u00a0of\u00a0lubricating\u00a0oil\u00a0specifications\u00a0and\u00a0precautions<\/li>\n<\/ul>\n\n\n\n 1, lubricating oil with lubrication, cooling, sealing, driving hydraulic cylinder and other functions. It has a decisive impact\u00a0on\u00a0the performance\u00a0of\u00a0the\u00a0screw\u00a0compressor, if\u00a0used\u00a0improperly or incorrectly, it\u00a0will lead to\u00a0serious damage\u00a0to\u00a0the\u00a0compressor\u00a0body. Therefore,\u00a0the\u00a0internal\u00a0lubricating\u00a0oil\u00a0system\u00a0is\u00a0the\u00a0key\u00a0to\u00a0the normal operation of the compressor, but the performance of the oil changes with time, and there is a relatively stable\u00a0period of\u00a0time\u00a0when the performance\u00a0will\u00a0be\u00a0sharply\u00a0deteriorated.\u00a0Therefore,\u00a0the\u00a0oil\u00a0should be changed at the right time.<\/p>\n\n\n\n <\/figure>\n\n\n\n 2, when should replace the lubricating oil to ensure the normal operation of the compressor, can be in accordance with the following methods:<\/p>\n\n\n\n \n Time set replacement: generally every 10,000 hours to check or replace the lubricating oil, and after the first operation, the air cooling and dry unit with screw compressor 1000 hours recommended to replace the lubricating oil and clean the oil filter. Because the residue of the system assembly will accumulate to the compressor after the formal operation. Therefore, for air-cooled and dry units with screw compressors 1000 hours (cumulative 2 months) should be replaced once, and then according to the cleanliness\u00a0of\u00a0the system\u00a0to\u00a0replace\u00a0regularly, if\u00a0the cleanliness\u00a0of\u00a0the\u00a0system is\u00a0good,\u00a0you\u00a0can\u00a0replace once every 10,000 hours (or annually).<\/li>\n<\/ul>\n\n\n\n \n If\u00a0the\u00a0exhaust\u00a0temperature\u00a0of\u00a0the\u00a0compressor\u00a0is\u00a0maintained\u00a0at\u00a0high\u00a0temperature\u00a0and\u00a0high\u00a0pressure\u00a0for a long time, the deterioration of the lubricating oil is accelerated. It is necessary to check the chemical characteristics of\u00a0the\u00a0lubricating\u00a0oil\u00a0regularly\u00a0(every\u00a02\u00a0months), and\u00a0replace\u00a0it when it is unqualified.\u00a0If\u00a0it\u00a0can not be checked regularly, it can be performed according to the following suggestion table. <\/li>\n<\/ul>\n\n\n\n The operation period is based on 16 hours of operation per day<\/p>\n\n\n\n running <\/strong>state<\/strong><\/strong><\/td> refrigeratio<\/strong>n<\/strong><\/td> Heating at 45<\/strong> <\/strong>\u2103<\/td> Heating at 50<\/strong> <\/strong>\u2103<\/td> Heating at 55<\/strong> <\/strong>\u2103<\/td> Heating above 55<\/strong> <\/strong>\u2103<\/td><\/tr> Replacement time <\/strong>(hours)<\/strong><\/strong><\/td> 10000<\/strong><\/strong><\/td> 8000<\/strong><\/strong><\/td> 4000<\/strong><\/strong><\/td> 1500<\/strong><\/strong><\/td> 500<\/strong><\/strong><\/td><\/tr> Replacement<\/strong> <\/strong>time<\/strong> <\/strong>(number<\/strong> <\/strong>of<\/strong> <\/strong>operating<\/strong> <\/strong>months)<\/strong><\/strong><\/td>  20<\/strong><\/strong><\/td>  16<\/strong><\/strong><\/td>  8<\/strong><\/strong><\/td>  3<\/strong><\/strong><\/td>  1<\/strong><\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n 3, the acidification of lubricating oil, will directly affect the life of the compressor motor, so it should be regularly checked whether the acidity of lubricating oil is qualified, the general acidity of lubricating oil below PH6 must be replaced. If the acidity can not be checked, the dryer filter element of the system should be replaced regularly, so that the dryness of the system is maintained in a dry state.<\/p>\n\n\n\n 4. The replacement procedure of lubricating oil needs to consult the compressor manufacturer after sale. In particular, the system has a motor burn precedent, after replacing the motor, it should track the lubricating oil condition every month, or replace the lubricating oil regularly (200 hours), until the system is clean, otherwise the residual acidic components in the system will destroy the motor insulation.<\/p>\n\n\n\n User's notice: Each manufacturer's compressor lubricating oil brand is different, please pay attention to the lubricating oil brand and dosage indicated on the original compressor nameplate when replacing the lubricating oil. Special attention: Because different types of lubricating oil contain anti-rust, anti-oxidation, anti-foam, anti-abrasion and other components are different, do not mix different types and different brands of oil, so as to avoid chemical reaction. Sticky deposits can clog the oil system. If the user replaces it privately, it shall be regarded as improper operation and not covered by the warranty of the product.<\/p>\n\n\n\n (4) Water quality management of circulating water (chilled water, cooling water)<\/p>\n\n\n\n The\u00a0poor\u00a0water\u00a0quality\u00a0of\u00a0chilled\u00a0water\u00a0and\u00a0cooling\u00a0water\u00a0will\u00a0not\u00a0only\u00a0scale\u00a0in\u00a0the\u00a0heat\u00a0transfer\u00a0pipe,\u00a0affect the heat exchange efficiency,\u00a0reduce the performance of\u00a0the\u00a0unit,\u00a0but\u00a0also corrode the\u00a0heat\u00a0transfer pipe resulting in major failures of the unit. Customers should be in accordance with the requirements of GB50050-1995 \"Industrial circulating cooling water treatment design code\" for water quality treatment. When the\u00a0chilled\u00a0water\u00a0system\u00a0is a\u00a0closed system, soft water\u00a0should be used.\u00a0The\u00a0cooling water (chilled<\/p>\n\n\n\n water of\u00a0the open\u00a0system) should\u00a0be\u00a0sampled and\u00a0analyzed regularly\u00a0during the\u00a0operation\u00a0of\u00a0the\u00a0unit, and the water quality should meet the requirements of Table 3-3. If it does not meet the requirements, water quality treatment should be carried out.<\/p>\n\n\n\n User notice: due to water untreated or improper treatment caused by corrosion, erosion or unit performance decline;<\/p>\n\n\n\n Four, maintenance methods and steps<\/p>\n\n\n\n (1) Oil change and filter dryer (must)<\/p>\n\n\n\n 1. Preparation: Check whether\u00a0the\u00a0compressor\u00a0lubricating oil\u00a0is preheated for more than\u00a08 hours. Before the test run, the oil heater should be energized for at least 8 hours to prevent frothing of frozen oil when starting. If\u00a0the\u00a0ambient\u00a0temperature\u00a0is\u00a0low, the\u00a0oil\u00a0heating\u00a0time\u00a0needs to\u00a0be\u00a0relatively\u00a0longer. When starting at\u00a0low\u00a0temperature, due\u00a0to\u00a0the\u00a0large\u00a0viscosity\u00a0of\u00a0lubricating\u00a0oil, it\u00a0will\u00a0be\u00a0difficult\u00a0to\u00a0start \u00a0and\u00a0the compressor will not be able to load and unload. Generally, the minimum temperature of the lubricating oil needs to reach\u00a023\u2103 or\u00a0more\u00a0before\u00a0it can\u00a0be\u00a0operated,\u00a0started,\u00a0started, recorded\u00a0operating parameters to\u00a0analyze the problems existing before and now. Make good preparations.<\/p>\n\n\n\n Short-circuit\u00a0the\u00a0high-low\u00a0differential\u00a0switch\u00a0(Figure\u00a01).\u00a0(It\u00a0is best\u00a0not\u00a0to\u00a0adjust\u00a0the\u00a0differential\u00a0pressure switch,\u00a0and\u00a0the\u00a0two\u00a0wires\u00a0can\u00a0be\u00a0short-connected\u00a0directly.) Run\u00a0the\u00a0machine\u00a0at\u00a0full\u00a0load\u00a0(100%). Close the corner valve (Figure 2). (Pay special attention to restore differential pressure switch after refrigerant recovery)<\/strong><\/p>\n\n\n\n <\/figure>\n\n\n\n \n Press the emergency switch or turn off the power when the low pressure pressure of the machine is less than 0.1MP. Since there is a check valve at the exhaust port of the compressor (Figure 1), the refrigerant\u00a0will\u00a0not\u00a0return\u00a0to\u00a0the\u00a0press,\u00a0but\u00a0sometimes\u00a0the\u00a0check\u00a0valve\u00a0may\u00a0be\u00a0closed\u00a0loosely,\u00a0so\u00a0it\u00a0isbest to close the stop valve of the press exhaust while pressing the emergency switch (Figure 3).<\/li>\n<\/ul>\n\n\n\n <\/figure>\n\n\n\n 2, when the above work is completed, turn off the main power supply. Carry on the following process<\/p>\n\n\n\n \n Oil,\u00a0frozen\u00a0oil\u00a0in\u00a0the\u00a0system\u00a0under\u00a0the\u00a0pressure\u00a0of\u00a0refrigerant\u00a0gas\u00a0spray\u00a0speed \u00a0quickly pay\u00a0attention to health do not spray<\/li>\n<\/ul>\n\n\n\n Splash to the outside. Drain refrigerant while draining oil, open high pressure gauge stop valve (Figure 4)<\/p>\n\n\n\n \n Clean the oil tank and oil filter (Figure 5) Open the cover of the oil tank and clean the dirty oil tank gauze\u00a0with\u00a0dry\u00a0gauze.\u00a0Then\u00a0pour\u00a0the\u00a0spent\u00a0frozen\u00a0oil\u00a0into\u00a0the\u00a0fine\u00a0gauze.\u00a0Remove\u00a0the two\u00a0magnets in\u00a0the oil\u00a0tank and\u00a0clean them before\u00a0putting them\u00a0back into\u00a0the\u00a0oil\u00a0tank. Use\u00a0a\u00a0big wrench to disassemble\u00a0the\u00a0oil filter and clean it with waste oil.<\/li>\n<\/ul>\n\n\n\n <\/figure>\n\n\n\n Replace\u00a0the\u00a0refrigerant\u00a0filter\u00a0A,\u00a0the\u00a0refrigerant\u00a0filter\u00a0core\u00a0has\u00a03\u00a0in\u00a0the\u00a0replacement\u00a0speed\u00a0should\u00a0be\u00a0fast, to prevent\u00a0too long\u00a0contact\u00a0time\u00a0with the\u00a0air\u00a0adsorption\u00a0of\u00a0too\u00a0much\u00a0water. B,\u00a0the\u00a0filter\u00a0is\u00a0packaged\u00a0in\u00a0cans, pay attention to protection during transportation, once the packaging is damaged, it is scrapped.<\/p>\n\n\n\n <\/figure>\n\n\n\n 3, vacuum refueling according to the compressor structure is best from the high pressure side of the refueling. Because the high pressure and low pressure chamber of the compressor are not directly connected, it\u00a0is\u00a0difficult\u00a0to\u00a0return to\u00a0the\u00a0oil\u00a0tank\u00a0from the\u00a0low\u00a0pressure\u00a0refueling. Generally, we use the way of vacuuming\u00a0to\u00a0evacuate the\u00a0oil\u00a0from\u00a0the\u00a0low pressure\u00a0side and\u00a0inhale the\u00a0oil from the high pressure side.<\/p>\n\n\n\n About<\/strong> <\/strong>vacuuming<\/strong>. The purpose is to pump out the moisture and air in the system. When the vacuum pump is sealed or aging is more serious, the vacuum degree can not meet the requirements, then it is useless to evacuate such a vacuum pump for a long time)<\/p>\n\n\n\n About<\/strong> <\/strong>vacuum<\/strong> <\/strong>damage.<\/strong> <\/strong>When evacuated to the negative pressure, open the Angle valve to release a little refrigerant from the condenser, which will destroy the vacuum of the system<\/p>\n\n\n\n Note: Liquid supply solenoid valve, <\/strong>because the solenoid valve is also closed when the machine is closed,\u00a0so\u00a0when the refrigerant oil\u00a0is\u00a0added,\u00a0the\u00a0pressure difference\u00a0switch\u00a0is\u00a0restored. Turn\u00a0on\u00a0the power to preheat and power on the solenoid valve (can be connected to the oil heater)<\/p>\n\n\n\n Fill the blind tube with oil: fill the blind tube with oil after filtering the replaced old refrigerant oil.<\/p>\n\n\n\n 4, preheating: power on preheating at least the oil heating to 23\u2103 or more to run the boot operation.<\/p>\n\n\n\n \n Open\u00a0the\u00a0condenser\u00a0to\u00a0clean,\u00a0clean\u00a0the\u00a0system\u00a0of\u00a0debris,\u00a0welding\u00a0slag,\u00a0dust,\u00a0some\u00a0anti-rust\u00a0coating and so on.<\/li>\n<\/ul>\n\n\n\n General high pressure pressure corresponding to the saturation temperature   condenser outlet water<\/p>\n\n\n\n temperature,\u00a0when\u00a0the\u00a0temperature\u00a0difference\u00a0is\u00a0greater\u00a0than\u00a03--5\u00a0degrees need\u00a0to\u00a0clean\u00a0the condenser. We\u00a0do not\u00a0recommend\u00a0frequent\u00a0chemical cleaning\u00a0of\u00a0the\u00a0condenser\u00a0to\u00a0prevent\u00a0corrosion of\u00a0the\u00a0condenser perforation leakage of fluorine, so it is very important to keep the circulating water clean and softened.<\/p>\n\n\n\n However, when the condenser must be cleaned, a professional water treatment expert should be found for analysis.<\/p>\n\n\n\n \n Unit\u00a0parameter\u00a0setting<\/li>\n<\/ul>\n\n\n\n 1.\u00a0The\u00a0chilled\u00a0water\u00a0temperature\u00a0is\u00a0generally\u00a0set\u00a0at\u00a07\u00a0degrees.\u00a0(Anti-freezing protection is set to\u00a04 degrees, when the\u00a0weather\u00a0is\u00a0cool\u00a0and\u00a0the\u00a0indoor\u00a0load\u00a0is\u00a0too\u00a0low, the\u00a0water\u00a0temperature may\u00a0drop\u00a0too fast\u00a0and\u00a0the machine has no time to stop the anti-freezing protection, then the water temperature can be set to 9 degrees).<\/p>\n\n\n\n 2, summer indoor load is too high when the boot may appear compressor overload failure. (At this time, the refrigerated pump should be turned off to reduce the water flow, and the water valve should be fully opened when the water temperature is below 15 degrees. Prevent high pressure or overload failure due to excessive load and low pressure for a long time).<\/p>\n\n\n\n 3, the cooling water temperature is best not higher than 40 degrees can not be lower than 25 degrees. (When the weather is cool, the cooling water valve can be turned off to keep the cooling water above 25 degrees)<\/p>\n\n\n\n 4. Machine operation data must be recorded. Before starting, should check the power supply voltage phase\u00a0imbalance\u00a0can\u00a0not\u00a0be\u00a0greater\u00a0than\u00a02%.\u00a0When\u00a0the\u00a0pressure\u00a0is\u00a0less\u00a0than\u00a05kg,\u00a0 it\u00a0is\u00a0not allowed to start, and\u00a0then\u00a0the\u00a0machine\u00a0may\u00a0leak fluorine\u00a0to\u00a0prevent the\u00a0system\u00a0water from\u00a0burning the\u00a0compressor when\u00a0it is started.<\/p>\n\n\n\n Five, common troubleshooting<\/p>\n\n\n\n \n Solenoid\u00a0valve\u00a0failure<\/li>\n<\/ul>\n\n\n\n Fault <\/strong>phenomenon<\/strong><\/strong><\/td> reason<\/strong><\/strong><\/td> Trouble shooting<\/strong><\/td><\/tr> Closing action time exceeds 3 <\/strong>seconds<\/strong><\/strong><\/td> The small hole on the side of the valve plug is <\/strong>blocked<\/strong><\/strong><\/td> Eliminate<\/strong> <\/strong>dirt<\/strong> <\/strong>inside<\/strong> <\/strong>the<\/strong> <\/strong>small<\/strong> <\/strong>hole<\/strong> <\/strong>and<\/strong> <\/strong>install<\/strong> <\/strong>a<\/strong> <\/strong>filter<\/strong> <\/strong>in<\/strong> <\/strong>front of the valve<\/strong><\/strong><\/td><\/tr> The valve does not open after the power is turned <\/strong>on<\/strong><\/td> 1. The power supply voltage is below <\/strong>85%<\/strong><\/strong><\/td> Adjust the power supply voltage within \u00b1 10% <\/strong>range<\/strong><\/strong><\/td><\/tr> Coil burnt out or connector <\/strong>detached<\/strong><\/td> \u00a0If necessary, use a manual device to open the valve for<\/strong>\u00a0<\/strong>maintenance or replace the coil. The newly wound coil <\/strong>must<\/strong>\u00a0<\/strong>be<\/strong>\u00a0<\/strong>soaked<\/strong>\u00a0<\/strong>and<\/strong>\u00a0<\/strong>dried,<\/strong>\u00a0<\/strong>and<\/strong>a<\/strong>\u00a0<\/strong>layer<\/strong>\u00a0<\/strong>of<\/strong>\u00a0<\/strong>quartz<\/strong>\u00a0<\/strong>powder<\/strong>\u00a0<\/strong>and asphalt (weight to weight ratio 3:1) composite <\/strong>adhesive <\/strong>should<\/strong>\u00a0<\/strong>be<\/strong>\u00a0<\/strong>soaked<\/strong>\u00a0<\/strong>between<\/strong>\u00a0<\/strong>the<\/strong>\u00a0<\/strong>coil<\/strong>\u00a0<\/strong>and<\/strong>\u00a0<\/strong>the<\/strong>\u00a0<\/strong>shell<\/strong><\/td><\/tr> The<\/strong>\u00a0<\/strong>gap<\/strong>\u00a0<\/strong>between<\/strong>\u00a0<\/strong>the<\/strong>\u00a0<\/strong>valve<\/strong>\u00a0 <\/strong>plug<\/strong>\u00a0<\/strong>and<\/strong>\u00a0<\/strong>the<\/strong>\u00a0<\/strong>valve<\/strong>\u00a0<\/strong>seat<\/strong>\u00a0<\/strong>is<\/strong>\u00a0<\/strong>not<\/strong>\u00a0 <\/strong>sealed, and there is leakage<\/strong><\/td> The<\/strong>\u00a0<\/strong>small<\/strong>\u00a0<\/strong>pores<\/strong>\u00a0<\/strong>on<\/strong>\u00a0<\/strong>the<\/strong>\u00a0<\/strong>side<\/strong>\u00a0<\/strong>of<\/strong>\u00a0<\/strong>the<\/strong>\u00a0<\/strong>valve<\/strong>\u00a0<\/strong>plug<\/strong>\u00a0<\/strong>are<\/strong>\u00a0<\/strong>blocked,<\/strong>\u00a0<\/strong>making it difficult to transmit medium pressure<\/strong><\/td>  Eliminate dirt from small <\/strong>holes<\/strong><\/strong><\/td><\/tr> The seal on the valve plug is damaged, worn or <\/strong>deformed<\/strong><\/strong><\/td> Replace the sealing <\/strong>ring<\/strong><\/strong><\/td><\/tr>  The pressure difference between the front and rear of<\/strong> <\/strong>the<\/strong> <\/strong>valve<\/strong> <\/strong>is<\/strong> <\/strong>less<\/strong> <\/strong>than<\/strong> <\/strong>10%<\/strong> <\/strong>of<\/strong> <\/strong>the<\/strong> <\/strong>standard<\/strong> <\/strong>pressure<\/strong> <\/strong>value<\/strong><\/strong><\/td> Comply<\/strong>\u00a0<\/strong>with<\/strong>\u00a0<\/strong>the<\/strong>\u00a0<\/strong>regulations<\/strong>\u00a0 <\/strong>on<\/strong>\u00a0<\/strong>the<\/strong>\u00a0<\/strong>front<\/strong>\u00a0<\/strong>and<\/strong>\u00a0<\/strong>rear<\/strong>\u00a0<\/strong>pressure difference in the product manual<\/strong><\/td><\/tr> The<\/strong>\u00a0<\/strong>static<\/strong>\u00a0<\/strong>and<\/strong>\u00a0<\/strong>dynamic<\/strong>\u00a0<\/strong>sealing<\/strong>points<\/strong>\u00a0<\/strong>of<\/strong>\u00a0<\/strong>the<\/strong>\u00a0<\/strong>valve<\/strong>\u00a0<\/strong>body<\/strong>\u00a0<\/strong>are not sealed<\/strong><\/td> The sealing gasket is not placed <\/strong>correctly<\/strong><\/strong><\/td> Place<\/strong> <\/strong>the<\/strong> <\/strong>sealing<\/strong> <\/strong>gasket<\/strong> <\/strong>correctly<\/strong> <\/strong>and<\/strong> <\/strong>tighten<\/strong> <\/strong>it<\/strong> <\/strong>evenly<\/strong> <\/strong>and<\/strong> <\/strong>reliably<\/strong><\/strong><\/td><\/tr> Sealing gasket deformation, wear or <\/strong>decay<\/strong><\/strong><\/td> Replace the <\/strong>seal<\/strong><\/strong><\/td><\/tr> The valve plug does not start after being powered <\/strong>on<\/strong><\/td> There is dirt inside the pressure relief <\/strong>hole<\/strong><\/strong><\/td> Eliminate dirt inside the pressure relief <\/strong>hole<\/strong><\/strong><\/td><\/tr> Inappropriate control medium, i.e. viscosity too <\/strong>low<\/strong><\/td> The<\/strong>\u00a0<\/strong>viscosity<\/strong>\u00a0<\/strong>of<\/strong>\u00a0<\/strong>the<\/strong>\u00a0<\/strong>medium<\/strong>\u00a0<\/strong>is<\/strong>\u00a0<\/strong>low,<\/strong>\u00a0<\/strong>and<\/strong>\u00a0<\/strong>the<\/strong>\u00a0<\/strong>pressure<\/strong>\u00a0<\/strong>relief hole should be appropriately increased<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n \n The\u00a0compressor\u00a0is\u00a0faulty<\/li>\n<\/ul>\n\n\n\n Fault <\/strong>phenomenon<\/strong><\/strong><\/td> reason<\/strong><\/strong><\/td> Troubleshooting<\/strong><\/strong><\/td><\/tr> \u00a0The compressor cannot <\/strong>start<\/strong><\/td> The main switch failed to <\/strong>close<\/strong><\/strong><\/td> Close the <\/strong>switch<\/strong><\/strong><\/td><\/tr> The<\/strong>\u00a0<\/strong>fuse<\/strong>\u00a0<\/strong>is<\/strong>\u00a0<\/strong>blown<\/strong>\u00a0<\/strong>and<\/strong>\u00a0<\/strong>the<\/strong>\u00a0 <\/strong>circuit<\/strong>\u00a0<\/strong>switch<\/strong>\u00a0<\/strong>is<\/strong>\u00a0<\/strong>not<\/strong>\u00a0<\/strong>closed<\/strong><\/td> Check whether the circuit and motor winding are<\/strong>\u00a0<\/strong>short <\/strong>circuited <\/strong>or<\/strong>\u00a0<\/strong>grounded,<\/strong>\u00a0 <\/strong>whether<\/strong>\u00a0<\/strong>there<\/strong>\u00a0<\/strong>is<\/strong>\u00a0<\/strong>overload<\/strong>\u00a0<\/strong>(after troubleshooting), replace the fuse or close the<\/strong>\u00a0<\/strong>switch, and check whether the connection is loose or<\/strong>\u00a0<\/strong>corroded<\/strong><\/td><\/tr> Thermal overload protection <\/strong>disconnected<\/strong><\/td> Overload<\/strong> <\/strong>protection<\/strong> <\/strong>automatically<\/strong> <\/strong>resets,<\/strong> <\/strong>and<\/strong> <\/strong>the<\/strong> <\/strong>fault<\/strong> <\/strong>is<\/strong> <\/strong>eliminated<\/strong> <\/strong>before<\/strong> <\/strong>the<\/strong> <\/strong>thermal<\/strong> <\/strong>overload<\/strong> <\/strong>protection<\/strong> <\/strong>is<\/strong> <\/strong>restored to safety<\/strong><\/strong><\/td><\/tr> Contactor or electromagnetic coil <\/strong>malfunction<\/strong><\/strong><\/td> Repair or <\/strong>replace<\/strong><\/strong><\/td><\/tr> Shutdown due to safety device <\/strong>protection<\/strong><\/td> Determine<\/strong> <\/strong>the<\/strong> <\/strong>type<\/strong> <\/strong>and<\/strong> <\/strong>cause<\/strong> <\/strong>of<\/strong> <\/strong>the<\/strong> <\/strong>shutdown,<\/strong> <\/strong>and<\/strong> <\/strong>troubleshoot the issue before restoring the safety<\/strong> <\/strong>switch<\/strong><\/strong><\/td><\/tr> No heat <\/strong>load<\/strong><\/strong><\/td> Waiting for heat <\/strong>load<\/strong><\/strong><\/td><\/tr>  <\/td> Repair or replace the electromagnetic <\/strong>coil<\/strong><\/strong><\/td><\/tr>  <\/td> Check<\/strong>\u00a0<\/strong>if<\/strong>\u00a0<\/strong>the<\/strong>\u00a0<\/strong>motor<\/strong>\u00a0<\/strong>has<\/strong>\u00a0<\/strong>any<\/strong>\u00a0 <\/strong>open<\/strong>\u00a0<\/strong>circuit,<\/strong>\u00a0<\/strong>short<\/strong>\u00a0<\/strong>circuit<\/strong>\u00a0<\/strong>or burnt out<\/strong><\/td><\/tr>  <\/td> Check<\/strong> <\/strong>all<\/strong> <\/strong>wire<\/strong> <\/strong>connectors<\/strong> <\/strong>and<\/strong> <\/strong>tighten<\/strong> <\/strong>the<\/strong> <\/strong>wire<\/strong> <\/strong>terminal<\/strong> <\/strong>bolts<\/strong><\/strong><\/td><\/tr>  <\/td> Reset the safety <\/strong>switch<\/strong><\/strong><\/td><\/tr> \u00a0The compressor cannot operate but makes <\/strong>noise<\/strong><\/td> Wiring <\/strong>error<\/strong><\/strong><\/td> Check and <\/strong>rewire<\/strong><\/strong><\/td><\/tr> Low <\/strong>Voltage<\/strong><\/strong><\/td> Check the power supply <\/strong>voltage<\/strong><\/strong><\/td><\/tr> Starter <\/strong>failure<\/strong><\/strong><\/td> replace<\/strong><\/strong><\/td><\/tr> Compressor <\/strong>damage<\/strong><\/strong><\/td> replace<\/strong><\/strong><\/td><\/tr> The compressor has abnormal noise and <\/strong>vibration<\/strong><\/strong><\/td> A<\/strong>\u00a0<\/strong>large<\/strong>\u00a0<\/strong>amount<\/strong>\u00a0<\/strong>of<\/strong>\u00a0<\/strong>refrigerant<\/strong>\u00a0 <\/strong>enters<\/strong>\u00a0<\/strong>the<\/strong>\u00a0<\/strong>compressor<\/strong><\/td> Check the setting of the expansion <\/strong>valve<\/strong><\/strong><\/td><\/tr> Compressor <\/strong>damage<\/strong><\/strong><\/td> replace<\/strong><\/strong><\/td><\/tr> The compressor cannot increase or decrease the <\/strong>load<\/strong><\/td> Energy control <\/strong>malfunction<\/strong><\/strong><\/td> replace<\/strong><\/strong><\/td><\/tr> The load shedding device has <\/strong>malfunctioned<\/strong><\/strong><\/td> replace<\/strong><\/strong><\/td><\/tr> Temperature<\/strong>\u00a0<\/strong>controller<\/strong>\u00a0<\/strong>level<\/strong>\u00a0<\/strong>malfunction<\/strong>\u00a0<\/strong>or<\/strong>\u00a0<\/strong>wire<\/strong>\u00a0 <\/strong>disconnection<\/strong><\/td> replace<\/strong><\/strong><\/td><\/tr> Unreasonable level <\/strong>setting<\/strong><\/strong><\/td> RESET<\/strong><\/strong><\/td><\/tr> The<\/strong> <\/strong>interval<\/strong> <\/strong>between<\/strong> <\/strong>increasing<\/strong> <\/strong>and<\/strong> <\/strong>decreasing<\/strong> <\/strong>the<\/strong> <\/strong>load of the compressor is too short<\/strong><\/strong><\/td> Abnormal water temperature <\/strong>controller<\/strong><\/strong><\/td> replace<\/strong><\/strong><\/td><\/tr> Insufficient water <\/strong>flow<\/strong><\/strong><\/td> Adjust water flow <\/strong>rate<\/strong><\/strong><\/td><\/tr> \u00a0Compressor thermal protection switch <\/strong>disconnected<\/strong><\/td> Operating conditions exceed the design <\/strong>range<\/strong><\/strong><\/td> Improve<\/strong> <\/strong>conditions<\/strong> <\/strong>to<\/strong> <\/strong>keep<\/strong> <\/strong>operating<\/strong> <\/strong>conditions<\/strong> <\/strong>within acceptable limits<\/strong><\/strong><\/td><\/tr> The exhaust valve is not fully <\/strong>open<\/strong><\/strong><\/td> Open the <\/strong>valve<\/strong><\/strong><\/td><\/tr> motor <\/strong>fault<\/strong><\/strong><\/td> Replace the <\/strong>compressor<\/strong><\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n \n The\u00a0motor\u00a0overload\u00a0relay\u00a0is\u00a0disconnected<\/li>\n<\/ul>\n\n\n\n Reason<\/strong><\/td> Troubleshooting<\/strong><\/strong><\/td><\/tr> Voltage too low under high load <\/strong>conditions<\/strong><\/strong><\/td> Check if the voltage drop of the power supply is too <\/strong>large<\/strong><\/strong><\/td><\/tr> Motor winding <\/strong>damage<\/strong><\/strong><\/td> Replace the <\/strong>compressor<\/strong><\/strong><\/td><\/tr> Loose power <\/strong>cord<\/strong><\/strong><\/td> Check all connections and tighten them <\/strong>tightly<\/strong><\/strong><\/td><\/tr> The condensation temperature is too <\/strong>high<\/strong><\/strong><\/td> Refer to the method for handling high exhaust <\/strong>pressure<\/strong><\/strong><\/td><\/tr> Voltage imbalance caused by power line <\/strong>failure<\/strong><\/strong><\/td> Check<\/strong>\u00a0<\/strong>the<\/strong>\u00a0<\/strong>power<\/strong>\u00a0<\/strong>supply<\/strong>\u00a0<\/strong>voltage,<\/strong>\u00a0<\/strong>notify<\/strong>\u00a0<\/strong>the<\/strong>\u00a0 <\/strong>power<\/strong>\u00a0<\/strong>supply<\/strong>\u00a0<\/strong>bureau,<\/strong>\u00a0<\/strong>and<\/strong>\u00a0<\/strong>do<\/strong>\u00a0<\/strong>not<\/strong>\u00a0<\/strong>start<\/strong>\u00a0<\/strong>the<\/strong>\u00a0<\/strong>compressor<\/strong>\u00a0<\/strong>until<\/strong>\u00a0<\/strong>the<\/strong>\u00a0<\/strong>fault is resolved<\/strong><\/td><\/tr> Overload relay broken, high ambient <\/strong>temperature<\/strong><\/strong><\/td> Improve ventilation to increase heat <\/strong>dissipation<\/strong><\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n \n The\u00a0unit\u00a0is\u00a0faulty<\/li>\n<\/ul>\n\n\n\n Fault <\/strong>phenomenon<\/strong><\/strong><\/td> reason<\/strong><\/strong><\/td> Troubleshooting<\/strong><\/strong><\/td><\/tr>      Exhaust pressure too <\/strong>high<\/strong><\/strong><\/td>  There are non condensable gases in the <\/strong>system<\/strong><\/strong><\/td> Discharge non condensable <\/strong>gases<\/strong><\/td><\/tr>  Excessive refrigerant <\/strong>charge<\/strong><\/strong><\/td> Extract excess <\/strong>refrigerant<\/strong><\/td><\/tr>  The exhaust shut-off valve is not <\/strong>open<\/strong><\/strong><\/td> Open the exhaust shut-off <\/strong>valve<\/strong><\/td><\/tr>  The outlet temperature of the condenser is too <\/strong>high<\/strong><\/strong><\/td> Check if the installation of the unit is appropriate and if the fins are <\/strong>scaled<\/strong><\/td><\/tr>        Exhaust pressure too <\/strong>low<\/strong><\/strong><\/td> Improper adjustment of condensation <\/strong>temperature<\/strong><\/td> Check the control and operation process of the <\/strong>condenser<\/strong><\/td><\/tr> The suction shut-off valve is not fully <\/strong>open<\/strong><\/td> Open the suction shut-off <\/strong>valve<\/strong><\/td><\/tr> Insufficient <\/strong>refrigerant<\/strong><\/td>  Leak detection, repair and refrigerant <\/strong>filling<\/strong><\/strong><\/td><\/tr> Low suction <\/strong>pressure<\/strong><\/td> Refer to the correct steps for handling low suction pressure <\/strong>below<\/strong><\/td><\/tr>  <\/td>  Refer to the following methods for handling compressor overload <\/strong>failure<\/strong><\/strong><\/td><\/tr>       Abnormal fuel <\/strong>supply<\/strong><\/strong><\/td> Oil filter inlet <\/strong>blockage<\/strong><\/td>  clean<\/strong><\/strong><\/td><\/tr> Liquid refrigerant enters the oil <\/strong>fraction<\/strong><\/td>  Check<\/strong> <\/strong>the<\/strong> <\/strong>electric<\/strong> <\/strong>heater,<\/strong> <\/strong>adjust<\/strong> <\/strong>the<\/strong> <\/strong>expansion<\/strong> <\/strong>valve<\/strong> <\/strong>to<\/strong> <\/strong>increase<\/strong> <\/strong>superheat,<\/strong> <\/strong>check the liquid supply solenoid valve, and adjust the water flow rate<\/strong><\/strong><\/td><\/tr> The oil pressure gauge is <\/strong>inaccurate<\/strong><\/td>  Repair or replace, close the valve and only open it when there is a <\/strong>reading<\/strong><\/strong><\/td><\/tr> Low oil <\/strong>level<\/strong><\/strong><\/td> come <\/strong>on<\/strong><\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n END!<\/p>","protected":false},"excerpt":{"rendered":" First, overhaul and maintenance pro 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