水冷螺杆冷水机组使用说明书英文版本

1、Installation & Operation manualScrew Type Water Cooled Chiller Nanjing Lidesheng Machinery CO.,LTD.ContentPart 1 Installation and maintenanceIntroduction2Schematic drawing for service clearance3Schematic drawing for hoisting4Setup and maintenance 5Part 2 Controlling and handlingIntroduction 12Pa

2、rt 1 Installation and maintenanceIntroductionMENERGY MSSH serial Water-cooled Screw-type Chiller, which is concisely designed, applies the advanced semi-enclosed dual-screw compressor and the high-effective heat exchange tube with the most updated technologies, and can be controlled through the adva

3、nced microcomputer. This product has advantages of stable system, low oscillation, high reliability and high effectiveness on energy saving. MENERGY original anti-reversal program for the compressor can strengthen the running reliability of the chiller. This product has more than twenty types for be

4、ing extensively applied in many comfortable or technical situations by the customer.Before the chiller is started up, all the related personnel in charge of setup, startup, operation and maintenance should carefully read through this manual so as to know all the precautions onsite.Schematic drawing

5、for service clearance Single-head:Dual-head:Schematic drawing for hoisting Single-head:Dual-head:Setup and maintenanceSetup and maintenance of the chiller should only be carried out by a qualified person who has been trained professionally, and is familiar with local standards and rules and has prac

6、tical operational experience. The trial running of the chiller must be carried out by the professional service supplier to ensure the quality of the chiller.Check before acceptance After the device has arrived, check if all the items listed in the delivery order are complete, and any part damaged du

7、ring transportation should be informed to the forwarding agent with written form for claim. Before setup, check if the local supply voltage, frequency and so on are complying with the chiller. MENERGY will bear no liability for any damage after the device has been accepted.HoistingHeavy-duty ropes o

8、r chains should be used for hoisting through the hoisting holes of the chiller, and the control cabinet and other parts of the chiller should be protected from damage when hoisting (The schematic drawing for hoisting introduced above should be referred to).Environmental requirementThe chiller is sui

9、table to be used in the environment that the surrounding temperature is -15 above and the relative humidity is 95%, and the ground for placement should be horizontal and with enough solidity or reinforcement measures should be taken (The requirements in the schematic drawings of ground base and serv

10、ice clearance for the chiller should be referred to).Water quality requirementAs the composition of local water is complicated, the water quality should be check when some uncommon water (such as industrial waste water, ground water, etc.) is used. If the water quality does not satisfy the requireme

11、nt for the water used in air-conditioning, the water should be treated according to the Specification for Design of Industrial Re-circulating Cooling Water Treatment or other related standards.ProgramUnitThe request of freezing waterThe request of Cooling waterPermit valuePermit valueSuspended solid

12、smg/L1020pH value（25）mg/L6.58.06.58.0Conductivity（25）S/L800800Methyl orange alkalinitymg/L150500Acid consumption（PH=4.8）mg/L100100Wide hardness CaCO3mg/L200200Fe2+mg/L1.01.0CI-mg/L200200SO42-mg/L200200SiO2mg/L5050NH4+mg/L1.01.0S2-mg/LNot allowedNot allowedFree Chlorinemg/L1.01.0Oilmg/L55Water pipesB

13、oth outlet and inlet of the chiller should be equipped with a stop valve, a thermometer and a pressure gauge for routine check and maintenance of the water system; and both outlet and inlet of the water pump should be equipped with a strainer to prevent impurities from going into the pump or the ves

14、sel; before insulating the heat of the water pipe, the sealing of the pipeline should be checked when the water is to go into the chiller; all the pipelines connected with the chiller should be equipped with vibration dampers and flow controllers (such as water flow valves, water pressure difference

15、 switch, etc.) as per the requirement; when a device for contamination draining is to be mounted to the water system of the air-conditioning engineering, it should be avoided from the pipelines of the outlet and inlet of the chiller, or the normal operation of the chiller would be disturbed.Schemati

16、c drawing for the external water pipeline systemPipeline design Installation Notesa) Pipe works must avoid any unnecessary bends and offset(up and down).b) Install gate valve for every joint for service and maintenance.c) Air vent must be installed at the highest position.Open the air vent to realea

17、se the air trapped in the water system.d) Water pump must install at water return linee) At the lowest point of the pipe work,install a gate valve drain out water.f) At the highest point of the pipe work,install a manual or automatic air vent.g) Install strainer before water entering to the water pu

18、mp.h) Flush lot of clean water to remove foreign material before unit start up.i) Pressure gauge and thermometer must be installed at visible and accessible location.Check before starting upWater circuit partCheck all the pipelines of the water system to ensure that the evaporator and the condenser

19、are correctly connected and the water flow direction is correct. Check if the inlet pipe and the outlet pipe of the heat exchanger mentioned above are well connected, and then open all the water valves and start up the corresponded water pump to wash the pipes so as to ensure the water system is cle

20、an and check if there is any leakage at the pipes and joints. Discharge the air in the water circuit of the evaporator and the condenser, and the water circuit should be keep clean away from rust. Check the resistance loss at the water side of the evaporator and the condenser against the water volum

21、e. Check if the temperature transducers are correctly connected.Electric circuit partCut off the main isolating switch and then check all the startup circuits and control circuits of the control cabinet to ensure all the switches are in off position. Check the power supply to the chiller and the vol

22、tage fluctuation range should be within ±10% of the rated voltage shown on the nameplate of the compressor, and the unbalance of the phase voltage should be within 2%. Check if there is enough power supply capacity to ensure the startup and full load running of the chiller. Check if all the ele

23、ctric wires and fuses have the matched specification with the running of the chiller, and finish all the interlock control circuits according to the related electric control drawing. Check and ensure all the ancillary equipments and control equipments for air-conditioning are in normal operation and

24、 have enough refrigerating capacity to satisfy the running requirement of the chiller at the first operation.Chiller partMake sure that the engine oil heater of the compressor has been electrified for 24 hours, and examine the oil level through the inspecting mirror of the oil separator, and refill

25、oil if the oil level can not be seen. Fully open the manual stop valve on the sparging pipe and remove the seal bonnet away, and fully open the suction and discharge stop valve and then counterclockwise turn it back for 1/2 circle, and then fully open the liquid supply stop valve and start up the an

26、cillary equipments, the condensed water pump and the refrigerated water pump, and finally check if all the safety control equipments are in original status and if the settings are correct. See <Table 1> below for the related items for checking.Safety equipmentsThe chiller is equipped with safe

27、ty protective devices to ensure safe running, and if one of the safety protective devices is in operation, an error indicator will turn on, and the corresponded function will stop while the other functions will be still normal. It is recommended to stop the chiller for troubleshooting to avoid from

28、more serious accident only if any part becomes abnormal. See <Table 2> for the detailed series of the safety protective devices of the chiller.Table 1: Checking items for safety devicesFrequencyItemMethodControl requirementDaily1. Discharge pressureCheck the indication value of high pressure (

29、discharge)1.11.8Mpa2. Discharge pressure difference between each running compressors Check the indication value of high pressure (discharge)0.1Mpa3. Suction pressureCheck the indication value of low pressure (suction)0.350.6Mpa4. Suction pressure difference between each running compressors Check the

30、 indication value of low pressure (suction)0.05Mpa5. Power supplyCheck with a voltmeterWithin ±10%6. Outlet temperature of the cooling waterCheck the thermometer30407. Outlet temperature of the refrigerated waterCheck the thermometer5108. Vibration and noiseFeeling and listeningNo abnormal vibr

31、ation and noise9. Environmental temperature (room temperature)Check the thermometer40Quarterly1. Injection rate of the secondary refrigerantCheck the flowing of the liquid in the secondary refrigerant pipelineNo air bubble2. Injection rate of the lubricantCheck the oil level gaugeWithin the specific

32、ationTable 2: Safety devicesSafety deviceResultHigh pressure switch (High pressure protection)1. The cooling water is not circulating or the water level is too low.2. The outlet temperature of the cooling water is too high.3. Scale formation occurs to the condenser.4. The system has non-condensing g

33、as in.Freezing point protector (Freeze protection)1. The temperature of the refrigerated water is too low.2. The set temperature is too low.Temperature switch (Exhaust temperature protection)1. The refrigerant amount is too low because of chiller leakage.2. The solenoid valve for cooling pipeline of

34、 the compressor closes because of some fault.3. The outlet stop valve for the condenser closes.Overheat protection for the electromotor (Protection for the motor of the compressor)1. The same to the high pressure switch (High pressure protection).Low pressure switch (Low pressure protection)1. The e

35、xpansion valve closes because of some fault.2. The outlet stop valve for the condenser closed.3. The flow rate of the refrigerated water is insufficient.4. Scale formation occurs to the evaporator.Phase reversal protector1. The connection of power supply is incorrect.Overcurrent relay1. The same to

36、the high pressure switch (High pressure protection).Safety valve1. Overpressure occurs to the system of working medium.Recommended running rangeStandard conditionRunning range (for starting up)Continuous running rangeinlet temperature of cooling water ()301640Outlet temperature of refrigerated water

37、 ()7925 416Recommended maintenance periods1000 hours2500 hours5000 hours20000 hours40000 hoursRotor bearingElectromotorLiquid injection control valveSolenoid valveSuction filterOil filterLiquid pipeline filter drierRefrigerator oilNote: Replace; CheckTroubleshooting for the Screw-type ChillerSymptom

38、Possible reasonRemoval methodThe discharge pressure is too high.1) Air or some non-condensing gas exists in the system;1) Discharge out from the condenser.2) The temperature of the cooling water is too high or the water flow through the condenser is insufficient.2) Adjust the water valve or the gate

39、 valve for control; check the water tower and also the filter in the pipeline.3) The copper pipes in the condenser are covered with scale, calc, and corrosion, etc.3) Clean the copper pipes.4) Pump fault4) Check the cooling water pump.5) The refrigerant is excessively filled, and the copper pipes of

40、 the condenser immerge in the refrigerant liquid.5) Remove the excessive refrigerant.6) The gas inlet valve of the condenser has not been fully opened.6) Fully open the valve.7) The suction pressure is higher than the normal value.7) Refer to "The suction pressure is too high".The discharg

41、e pressure is too low.1) The water through the condenser is too much, or the temperature of the water is too low.1) Adjust the water valve or the gate valve for control; check the water tower.2) Oil bubbles appear because the liquid refrigerant has flowed into the compressor through the evaporator.2

42、) Check and adjust the expansion valve to ensure that the temperature sensor is tightly fixed on the suction pipe and well insulated from heat; the inlet temperature of the cooling water should be higher than the limited temperature.3) The outlet valve for the liquid of the condenser has leakage.3)

43、Check the running current of the chiller, and replace the outlet valve if necessary.4) The suction pressure is lower than the normal value.4) Refer to "The suction pressure is too low".5) The refrigerant is insufficient and some gaseous refrigerant has been admitted into the liquid pipelin

44、e.5) Fill into sufficient refrigerant.The suction pressure is too high.1) The discharge pressure is too high.1) Refer to "The discharge pressure is too high".2) The refrigerant is excessively filled.2) Discharge the excessive refrigerant.3) Liquid refrigerant has flowed into the compressor

45、 through the evaporator. 3) Check and adjust the expansion valve to ensure that the temperature sensor is tightly fixed on the suction pipe and well insulated from heat; the inlet temperature of the cold water should be higher than the limited temperature.4) The heat insulation of the cold water pip

46、e is bad.4) Check the heat insulation of the pipeline.The suction pressure is too low.1) The outlet valve for the refrigerant liquid of the condenser has not been fully opened.1) Fully open the valve.2) The liquid pipe or the suction pipe is blocked.2) Check the filter for the refrigerant.3) The exp

47、ansion valve has some fault or has been incorrectly adjusted3) Correctly adjust the degree of superheat, and check if the temperature sensor has any leakage.4) The refrigerant in the system is insufficient.4) Check if there is any leakage of the refrigerant.5) Excessive lubricant is circulating in t

48、he system.5) Check the lubricant amount.6) The inlet temperature of the cold water is lower than the standard value.6) Adjust the temperature set value.7) The cold amount through the evaporator is insufficient.7) Check the pressure loss of the cold water pipeline.8) The discharge pressure is too low

49、.8) Adjust the water gate valve.The compressor stops because of the break-off of high pressure1) The cooling water is insufficient.1) Check the water gate valve.2) The condenser is blocked; the water inlet gate valve is closed.2) Check the copper pipes of the condenser and also the gate valve.3) The

50、 set value for high pressure protection is incorrect.3) Check the set value.The compressor stops because of overload of the motor.1) The voltage is too high or too low.1) Check if the voltage complies with the rated value, and balance the phase if necessary.2) The discharge pressure is too high.2) C

51、heck the discharge pressure, find out the reason and clear it.3) The temperature of the back water is too high.3) Find out the reason and clear it.4) The overload element has some fault.4) Check the compressor current, and compare it with the full load current in the data sheet.5) The motor or the c

52、onnection has a short circuit.5) Check the impedance between the wiring seat of the motor and the ground wire.The compressor stops because of the break-off of the temperature sensor in the motor1) The voltage is too high or too low.1) Check if the voltage complies with the rated value, and balance t

53、he phase if necessary.2) The discharge pressure is too high.2) Check the discharge pressure, find out the reason and clear it.3) The temperature of the back water is too high.3) Find out the reason and clear it.4) The temperature sensor for the motor winding has some fault.4) Check the element conta

54、ct point on the wiring seat of the temperature sensor for the compressor under the refrigerated condition (The compressor has been stopped for more than 10 minutes).5) The refrigerant in the system is insufficient.5) Check if refrigerant leakage exists.The compressor stops because of the break off o

55、f the low pressure protective switch.1) The filter in the liquid pipe for the refrigerant is blocked.1) Check and repair the filter screen or replace the filter.2) The expansion valve has some fault.2) Check the expansion valve.3) The refrigerant filled is insufficient.3) Refill the refrigerant.4) T

56、he liquid outlet valve of the condenser has not been fully opened.5) Fully open the valve.The compressor has noise.Some liquid refrigerant has been admitted into the compressor through the evaporator.Throttle the refrigerant liquid until there is not liquid refrigerant discharged from the evaporator, and then check the expansion valve and the overheating.The compressor can not be put into operation.1) The overload protector is broken off, or the fuse for the control circuit is blown out.1) Restart the chiller after having checked t