【正文】 iability)The Reciprocating cooling water unit shall be shut down for inspection once a year so as to correctly evaluate the equipment status, making a good preparation for the operation in the next season. Please refer to the following items to be inspected and prepared for details: Measure and record the winding resistance of the motor with the megger。 Inspect oil level of the pressor and supplement the lubricating oil as required。 Inspection and confirmation of the heater in its normal operation。 Replacement of the drying filter。 Tighten the contacts and the wires inside the motor terminal box。 Clean all the connectors and replace them as required。 Inspection of all the relays, operational control units, unloading devices。 Inspect and confirm suction and air exhausting valves of the pressor are in good conditions.A/C system (directfired units)Requirements for overhaul of A/C unitsThe owner is responsible for the regular maintenance of the directfired units.Maintenance Content (Annual)FrequencyServiceTimeOnceInspection of refrigeration poweronMayTwiceInspection after refrigeration shutdown October3 timesInspection of heating poweronNovember4 timesInspection after heating shutdown March ~ April5 timesLiquor sample testDuring unit operationKey inspection items of the directfired units’ regular maintenance are as follow:1）Inspect and test all the devices。2）Analyze and measure the operation。3）Management of absorbent and coolant。4）Management of bustion device and cleaning and dust removing in the bustion room。5）Maintenance of vacuum pump。6）Examination and repair of the pumps。7) Cleaning of thermal transmission pipe inside the absorber and condenser。Be responsible for timely informing the manufacturer to inspect and solve the problem when there is sudden breakdown during the operation of the directfired units.Description of professional maintenance of refrigeration equipment and the concentration A/C main equipment1. Gradeone maintenance (within 4000 hours of operation), under the responsibility of the owner. Remove the rust, paint internal and external surfaces of the main equipment. Fasten the screws and nuts of the main equipment. Repair insulation layer of the main equipment. Install antimice network. Clean the surface of refrigeration system and internal and external electrical control cabinets as well as electrical control system of the main equipment. Test accessories and parts of the electrical control system, resistance and insulation values, sensitivity and precision of the fans and motors. Eliminate abnormal noises, peculiar smells and potential risks of the electrical control system and clean its surfaces and then fasten them. Test the working conditions of various valves, protectors, filters and detectors of the refrigeration system to eliminate the potential risks. Check whether there is an electricity leak and block in the refrigeration system. Test temperature of each part of the refrigeration system including the pressor. In order to eliminate the potential risks, test condensation pressure, evaporation pressure, suction pressure, air exhausting pressure, oil temperature and pressure, condensation temperature, evaporation temperature, frozen water access temperatures and difference in temperature, cooling water access temperatures and difference in temperature. Test the precision and sensitivity of the instruments and apparatuses, and then correct and clean them. Carry out a prehensive adjustment and missioning for the main equipment on its working conditions, add or retrieve the coolant reasonably according to the real situation, making the main equipment in a good working condition. After gradeone maintenance having been done, the equipment has clean appearance and is in a good operational condition.Gradetwo maintenance (more than 4000 hours of operation) (The owner’s liability) Dismantle various valves and filters of the cooling system for test and potential risk elimination. Change the filter or the core of the filter. Clean the oil tank and oil filter of the pressor and replace the cooler. Remove accessories and protectors of the electrical control system for thoroughly clean, rustremoval, dustremoval and deaxidation treatment in order to eliminate potential risks. Dismantle the motor of the fan to clean the shaft and the bearing for test, lubricate the bearing to reduce the potential risks. Restore in place and test the cables and wires to find problems. Test the resistance value, insulation status and work current of the motor of the pressor. Check whether there is an electricity leak and block in the refrigeration system. Test the temperature of each part of the refrigeration system including the pressor. Test condensation pressure, evaporation pressure, suction pressure, air exhausting pressure, oil temperature and pressure, condensation temperature, evaporation temperature, frozen water access temperatures and difference in temperature, cooling water access temperatures and difference in temperature. Coolant shall be retrieved prior to performing maintenance, then test the pressure, check if there is an electricity leak and block in the refrigeration system. Test the vacuum, after that, the coolant shall be conveyed back to the system. Test the precision and sensitivity of the instruments and apparatuses and then correct and clean them. Carry out a prehensive adjustment and missioning for the main equipment on its working conditions, add or retrieve the coolant reasonably according to the real situation, making the main equipment in a good working condition. After gradetwo maintenance having been performed, the potential risks shall be removed and the equipment shall be in a good operational condition.Gradethree maintenance (more than 5000 hours of operation) (The owner’s liability) Clean internal cooler and evaporator