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Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual

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Summary of Contents for MLSC380A-SB3Z

Page 1: ...DM16 03 01 46en Applicable Model MLSC380A SB3Z MRH380A B3Z MLSC500A SB3Z MRH500A B3Z MLSC600A SB3Z MRH600A B3Z...

Page 2: ...related models The product introduced in this manual is in compliance with GB T18430 1 2007 Report to and register in the local corresponding administrative organization before and after operating the...

Page 3: ...hypoxia and make you feel uncomfortable In this case improve ventilation or blast air by using fan coil to keep the air near the ground in circulation Do not enter the polluted area until the refrige...

Page 4: ...he unit to remove fouling Do not use acidic alkaline chemicals If fire breaks out accidentally you should immediately shut down the main power and use fire extinguisher applicable to oil fire and elec...

Page 5: ...for Foundation Installation and Diagrams of Foundation 15 6 3 Installation Space and Appearance 19 6 4 Requirements for Water System Installation and Recommended Diagram for the Water System 45 6 5 El...

Page 6: ...Exchanger 106 10 3 Procedure for Replacing the Dry FilterElement 108 10 4 Lubricant 108 10 5 Charging and Evacuating Refrigerants 108 10 6 Routine Maintenance Items 109 10 7 Safety Requirements for M...

Page 7: ...ged with the necessary refrigerants and lubricants The air source screw water chiller unit adopts twin screw compressor designed with the most advanced industrial third generation asymmetric technolog...

Page 8: ...2 Smart control Adopts micro computer controller featuring various automatic control functions such as fault diagnosis and energy management and monitoring which ensures efficient running and easy ope...

Page 9: ...e entire system simple Therefore the maintenance is more convenient and operation is more reliable 3 The special high precision zero clearance bearing ensures the long service life of units 4 The SKF...

Page 10: ...fect is noticeable especially at high condensing temperature and low evaporation temperature The unique economizer access port of screw compressor directly takes the gaseous liquid back to the compres...

Page 11: ...the unit s load changes and adjusts the refrigerant volume The capacity adjustment can adopt four step control mode 25 50 75 and 100 or stepless adjustment this function must be noted on the order whi...

Page 12: ...atic Energy adjustment range 25 50 75 100 Refrigerant Name R134a Charge kg 80 96 135 Power supply Three phase five wire system 380V 3P N PE 50Hz Safety protection High pressure Low pressure Low water...

Page 13: ...formance parameters of the basic module are listed You can obtain performance parameters of unit combinations by referencing the listed parameters 3 The design pressure on the chilled water side is 1...

Page 14: ...2280 2280 2280 Height 2370 2370 2370 Unit weight kg 1360 2070 2390 Running weight kg 1380 2090 2410 Notes 1 Nominal cooling capacities are based on the following conditions Chilled water inlet outlet...

Page 15: ...quency Rated frequency 2 Evaporator max working pressure on water side 1 0 MPa Compressor max start count 6 times h Environment quality High corrosive environment and high humidity should be avoided D...

Page 16: ...he foundation diagram in section 7 2 2 4 3 Models with Special Features Certain models with special features can provide specific functions to meet various requirements of customers S N Type Function...

Page 17: ...ller comprises five major components including the compressor finned heat exchanger electronic expansion valve shell and tube heat exchanger and electric control system and some auxiliaries such as th...

Page 18: ...e the units as shown in the following figure Diagram for horizontal movement Units Steel rod Skid 2 To hoist the units pay attention to the following instructions Choose a suitable crane based on the...

Page 19: ...Air Source Screw Water Chiller Unit Installation Operation and Maintenance Manual 14 Indoor units hoisting Outdoor units hoisting...

Page 20: ...ear the buildings Units must be installed on a solid foundation A block of concrete slab is recommended whose load bearing capacity must be sufficient to withstand all the units as well as the weight...

Page 21: ...odel Weight to be supported by spring isolator kg A B C D MRH380A B3Z MHD 650 MHD 650 MHD 650 MHD 650 Notes 1 The spring shock absorber is optional 2 The value in the type of spring shock absorber ind...

Page 22: ...nit Foundation Unit bottom Foundation bolt M14 Control box Model Weight to be supported by spring isolator kg A B C D E F MRH500A B3Z MHD 650 MHD 650 MHD 650 MHD 650 MHD 650 MHD 650 Notes 1 The spring...

Page 23: ...ni t bo t to m F ou n d at i o n b ol t M 1 4 C on t r ol bo x F o u n da t io n Model Weight to be supported by spring isolator kg A B C D E F MRH600A B3Z MHD 650 MHD 650 MHD 650 MHD 650 MHD 650 MHD...

Page 24: ...n units In addition the places around units must be kept clean without blocks Otherwise units maintenance could be inconvenient In areas where snows might fall in the winter the following instructions...

Page 25: ...llowing figure Monsoon As a result the cooled air flow will be cooled by another heat exchanger again The refrigerating capacity will reduce and the unit can be faulty Although air cooled screw water...

Page 26: ...door units are as follows 1 The distance between the power control cabinet and the windbreak must be larger than 1 000 mm 2 The distance between the unit and the windbreak on the side of shell and tub...

Page 27: ...Air Source Screw Water Chiller Unit Installation Operation and Maintenance Manual 22 1m 3 5m 1 2m Door Room 1m...

Page 28: ...Air Source Screw Water Chiller Unit Installation Operation and Maintenance Manual 23 2m...

Page 29: ...ipes Blast Vacuum Introduce nitrogen when welding Keep clean in processing the auxiliary pipes Blast Use qualif ied welding rods Strictly follow the welding operation specif ication Strictly follow th...

Page 30: ...o the stretching of pipes 6 3 2 6 Moving and Storing of Pipes 1 Do not break the pipes when they are moved to the construction site 2 Use end caps or adhesive tapes to seal pipe ends before the pipes...

Page 31: ...ction as required Sealing with end caps and adhesive tapes Copper pipe End cap Insert Wrap the joints firmly with adhesive tapes This method is recommended Solder sealing 2 Pay attention to the follow...

Page 32: ...e installation 6 3 2 8 Copper Pipe Processing 1 Pipe Cutting 1 Tool Use a drill pipe cutter instead of a saw or cutting machine to cut the copper pipe 2 Correct operation procedure Turn the drill pipe...

Page 33: ...pipe end 3 Operation method Insert the head of the pipe expander into the pipe After the pipe is expanded view the copper pipe from another angle and maintain the pipe end and left a straight line ma...

Page 34: ...ogen filled hose Connect the nitrogen filled hose to the pipe component to be soldered and seal all other pipe ends except for the soldering end which is used for nitrogen filling 4 Precautions for so...

Page 35: ...en filling 5 Ensure that the nitrogen flow can pass the soldering point 6 If the distance between the place where nitrogen is filled in and the soldering point on the pipe fill in enough nitrogen and...

Page 36: ...n instead of any other gas because Polyter afuoroethyenea or carbon dioxide may cause condensation and oxygen may cause explosion 2 Use a gas tube to connect the outlet of pressure regulator valve and...

Page 37: ...ts in the entire system In this way no system failure due to refrigerant leakage will occur 2 General principle Inspections in different phases pressure maintaining for the entire system and pressure...

Page 38: ...ressure increases drops by 0 1 kgf cm2 when the ambient temperature increases drops by 1 C Compensating formula Actual value Pressure during pressure increasing Temperature during pressure increasing...

Page 39: ...heat exchange during operation 3 Check for system leakage from the opposite direction and keep the negative pressure 2 Selection of vacuum pump 1 The extreme vacuum degree must be 756 mmHg or lower 2...

Page 40: ...source exists Note It is forbidden to remove the pressure gauge during vacuum pressure maintaining process Otherwise external air will be taken in 2 Procedure for special vacuum drying Special vacuum...

Page 41: ...rmed by using warm water or hot air instead of being heated up above fires 6 3 2 14 Thermal Insulation Common thermal insulation is applied to refrigerating devices and pipes To be specific devices an...

Page 42: ...the external diameter of the copper pipe 25 mm indicates the thickness of insulating layer Note Thicker insulating layer should be used in the hot and humid scenario Note Outdoor pipes must be protec...

Page 43: ...e insulating performance will be affected In addition the bandage will age and scatter as the time passes by Bandage is not required in hidden indoor places Otherwise the insulating performance will b...

Page 44: ...f the height of indoor unit and outdoor unit is not greater than 6 m respectively install the recommended connection pipes shown in the following table Refrigerant and lubricant can be recharged prope...

Page 45: ...the height of indoor unit and outdoor unit is greater than 6 m you are advised to install the vertical part of the vent pipe in the method shown in the following figure The specifications of connectio...

Page 46: ...pipe comprises two pipes Model Connection Pipe of Vent Pipe Length of the Connection Pipe of Vent Pipe m Length of the Connection Pipe of Liquid Pipe m 0 15 15 30 30 50 0 50 MLSC380A A 21 8 in 21 8 in...

Page 47: ...Lubricant Recharge When the connection pipes are installed and the inner part of the pipes are clean and vacuum the vacuum degree is 756 mmHg or lower lubricant can be recharged To recharge lubricant...

Page 48: ...teroutlet Waterinlet Outletcondenser interface Inletcondenser interface Model MLSC_A L W H A B C D E F Inlet condenser interface Outlet condenser interface Frozen water interface 380 3300 1200 1830 23...

Page 49: ...of MRH380A B3Z 500 600 outdoor unit Inletcondenser interface Outletcondenser interface Model MRH_A L W H A B C D Inlet condenser interface Outlet condenser interface 380 3500 2280 2370 1335 1170 250...

Page 50: ...pipelines for easy maintenance A drain pipe must be installed in each low position so that the evaporator and pipeline can drain water thoroughly A deflation valve must be installed on the top positio...

Page 51: ...shing and leakage Water leakage will not cause serious problems to water quality control However if sea water or polluted underground water spills microorganisms may breed in the water heat storage ta...

Page 52: ...sed on the specifications of the pipe For details see the water flow switch manual provided by the manufacturer The water flow switch is connected to the terminal on the control box For details see th...

Page 53: ...for which you must request the manufacturer or authorized dealer to provide related installation and technical services If the wiring does not meet the electrical installation standard the controller...

Page 54: ...R240 4 BVR120 1 500 A MLSC600A SB3Z BVR240 4 BVR120 1 500 A MRH380A B3Z BVR16 4 BVR10 1 100 A MRH500A B3Z BVR25 4 BVR16 1 100 A MRH600A B3Z BVR25 4 BVR16 1 100 A Common Cables BVR Copper core PVC insu...

Page 55: ...se the motor current will be overlarge resulting in overheating of the motor As a result the compressor lifespan becomes short and even the motor may be burnt In addition an overlarge unbalanced volta...

Page 56: ...p Alarm Cooling run output Indication Fan Group 1 Fan Group 2 Fan Group 3 Fan Group 4 Fan Group 5 Fan Group 6 Fan overload Prot Switch X 1 2 3 4 5 6 7 8 9 101112131415161718192021222324252627282930313...

Page 57: ...oup 2 Fan Group 3 Fan Group 4 Fan Group 5 Fan Group 6 Fan overload Prot Switch External wiring diagram for outdoor units of the MRH380A MRH500A and MRH600A series Note The indoor and outdoor units mus...

Page 58: ...the circuit diagram label delivered together with the unit 2 You must use a cable with correct specifications to provide electric power for the unit The unit must be supplied power independently It is...

Page 59: ...rictly according to the National Electrical Code Ground cables can resist electric shocks 2 Install the control box of the main power supply switch at an appropriate position 3 Install a sealing devic...

Page 60: ...combination control The connection of the water pump must comply with the diagram and an intermediate relay must be used If you do not use the combination control function for the water pump ensure t...

Page 61: ...SC500A SB3Z and MLSC600A SB3Z M 3 JTX A L1 L2 L3 L N S1 S2 M1 M2 L1 L2 L3 12 11 14 KR1 L1 L2 L3 PE TA1 TA2 FR KM11 KM13 KM12 4 7B 1X 21 1X 22 L12 Nb 20 2 3 12C 125 127 123 1ST1 1ST2 32 2 4 9B 4 9C 3P...

Page 62: ...1 L11 Na 1L1 N B 1 12 B 1 12 QF1 L1 1P 50Hz 230V 6A QF2 1P 50Hz 220V 4A 0 75mm 3A QF3 53 M 1X 26 1X 25 EH1 KA9 51 KM11 55 NTC KA1 EVD 76 78 80 1X 75 84 86 88 90 1X 77 82 24V 220V L N V V A10 1X 27 1X...

Page 63: ...aintenance Manual 58 L51 Na B 2 12 B 2 12 SB L12 Nb 24V 220V HMI L N V V 24V 0V RS485 FG A9 2 4 4 1D 4 3B KA1 KM13 KM11 KM11 KT1 KM12 KM13 KT1 63 71 65 75 73 KM13 KT1 KM12 KM12 67 69 F 4 2 SL1 1X 31 1...

Page 64: ...6 1E 6 1F L12 Nb 1X 36 1X 35 6 X 3 1X 37 1X 38 14 SP1 16 1X 40 1X 39 SP2 18 1X 41 1X 42 KR1 1X 44 1X 43 KM12 KM11 22 100 1X 48 1X 47 SP3 26 1X 49 1X 50 30 SA1 X 7 X 8 1X 52 1X 51 1X 53 1X 54 X 9 X 10...

Page 65: ...25 6 5A A3 TM2DRA16RT A2 4 12D TM2DOCKN Q1 Q2 Q3 Q4 Q5 Q6 Q7 COM0 Q8 Q9 Q10 Q11 Q12 Q13 Q14 Q15COM1COM1 27 29 31 33 35 37 39 1X 11 1X 14 1X 15 1X 18 1X 19 X 15 X 18 1X 9 1X 12 1X 13 1X 16 1X 17 1X 20...

Page 66: ...B B A B B A B B NC A B B A B B OV NC A B B A B B 1X 55 1X 56 1X 57 40 1X 58 1X 59 1X 60 1X 61 1X 62 1X 63 1X 64 1X 65 1X 66 1X 67 1X 68 1X 69 42 44 46 48 50 52 54 56 58 60 62 64 66 A6 4 12B 2 4 RT1 RT...

Page 67: ...OL ITEM DESCRIPTION 1 TA1 TA2 2 3 1QF QF1 QF2 QF3 QF4 4 5 6 7 8 9 10 11 12 13 14 15 16 18 19 KR1 KM11 KM12 KM13 FR FR1 FR10 M KT1 KM1 KM10 SB EH1 EH2 KA1 KA7 A8 SL1 M 3 SQ1 21 22 23 24 25 26 27 28 29...

Page 68: ...2kW 5 8A U11V11W11 U1 V1 W12PE U21V21W21 FR2 U2 V2 W2 2PE KM3 KM4 FR3 U31V31W31 U3 V3 W3 2PE U41V41W41 FR4 U4 V4 W42PE KM5 KM6 FR5 U51V51W51 U5 V5 W52PE U61V61W61 FR6 U6 V6 W62PE 2QF 2X 15 2X 16 2X 17...

Page 69: ...V2 W2 2PE KM3 KM4 FR3 U31V31W31 U3 V3 W3 2PE U41V41W41 FR4 U4 V4 W42PE KM5 KM6 FR5 U51V51W51 U5 V5 W52PE U61V61W61 FR6 U6 V6 W62PE 2QF 2X 15 2X 16 2X 17 2X 18 2X 19 2X 20 2X 21 2X 22 2X 23 2X 24 2X 25...

Page 70: ...41 FR4 U4 V4 W42PE KM5 KM6 FR5 U51V51W51 U5 V5 W52PE U61V61W61 FR6 U6 V6 W62PE 2QF 2X 15 2X 16 2X 17 2X 18 2X 19 2X 20 2X 21 2X 22 2X 23 2X 24 2X 25 2X 26 2X 27 2X 28 2X 29 2X 30 2X 31 2X 32 2X 1 2X 3...

Page 71: ...whether each wiring is connected correctly Check whether the power supply of the unit is consistent with that shown on the nameplate The maximum allowed unbalance between the output voltage and the ra...

Page 72: ...ly of the compressor Turn on the main power supply again to start the unit 7 2 Commissioning Operations Install a fluorine pressure gauge and a thermometer sensing probe on the unit and start the comp...

Page 73: ...check whether the oil level of the compressor is normal To ensure that the unit can run all the time start all terminal devices to provide sufficient air conditioning load After the commissioning is...

Page 74: ...the specific heating time from the state information on the touchscreen 2 Check whether the water flow meets the unit requirement 3 Check whether all control switches and components in the power distr...

Page 75: ...Unit Installation Operation and Maintenance Manual 70 8 4 Control Interface Structure Welcome Page Homepage AI O Password Modify parameter Mode selection DI O Clock Setting Alarm Setting Status Screen...

Page 76: ...ity for any hurt or consequence arising therefrom When choosing a switch in remote control mode you must choose a maintained switch Otherwise the unit is likely to work in only one state 4 Three indic...

Page 77: ...The red indicator is the communication indicator It blinks at a high frequency in normal conditions If it is in other states check whether the communication cable of the controller is correctly and se...

Page 78: ...ypad enter 58806 and click Enter to enter the mode setting page On this page set a control mode and a running mode The system s current control and running modes are displayed in the upper part of the...

Page 79: ...main page or click BACK to return to the previous page that is the home page The main page displays unit information such as the current status control mode and running status After you click BACK th...

Page 80: ...he temperature is recovered the compressor starts automatically 6 FAULT indicates that the unit is encountering a fault After the fault is rectified the status disappears On the main page click to ent...

Page 81: ...ve page are described as follows Cooling Setting Temp LWT indicates the target water temperature Tem Cooling Compressor Start LWT indicates the outlet water temperature at which the unit can start the...

Page 82: ...will not take any responsibility for any consequence arising therefrom Click Screen Setting to enter the touchscreen setting page On this page you can click or to increase or decrease the brightness...

Page 83: ...s complete click It then turns to indicating that the units are in the combination control state Then at the bottom of the screen set the number of units that need combination control You can click to...

Page 84: ...you can perform the following settings 1 Set the starting and shutdown time on Tuesday to 10 00 and 00 00 respectively and click the Invalid button to validate the settings 2 Keep the starting and sh...

Page 85: ...Air Source Screw Water Chiller Unit Installation Operation and Maintenance Manual 80 On this page you can click or to view a maximum of 100 historical alarm messages of the unit...

Page 86: ...t the two switches manually 3 After a PLC module fault is rectified you must power off and then power on the unit to clear the fault On the above page click to enter the page shown in the following fi...

Page 87: ...nstallation Operation and Maintenance Manual 82 Click on the main page to enter the combination mode query page Note The Multi status button is available only when COMBINSTION MODE is set to MULTI UNI...

Page 88: ...Unit Installation Operation and Maintenance Manual 83 On this page you can select a module to view its status or monitor the master unit to view the status of each unit To do so click to enter the pag...

Page 89: ...lation Operation and Maintenance Manual 84 Click PgDn to enter the page shown in the following figure Click on the combination mode query page or on the main page when a single unit is connected to en...

Page 90: ...unit is not reached Unit running status 25 50 75 or 100 Residual electricity of the PLC battery Notes To start the unit ensure that the following conditions are met 1 Restart Delaying must be set to N...

Page 91: ...to enter the page shown in the following figure This page displays the output status of the unit OFF indicates that a point has no output ON indicates that a point has output Click PgDn to enter the p...

Page 92: ...witch is faulty The wiring is loose Manual Anti freeze protection The anti freeze protection switch trips out for 3 seconds Stop the unit The water temperature is lower than 3 C The anti freeze switch...

Page 93: ...aded The thermal overload relay s switch is faulty The wiring is loose Manual Power supply failure The power protection module trips out for 3 seconds Stop the unit The three phase voltage power suppl...

Page 94: ...inlet water temperature sensor The PT100 s resistance is smaller than 20 Stop the unit Manual Open circuit of ambient temperature sensor The PT100 s resistance is greater than 300 Stop the unit Manual...

Page 95: ...Operation and Maintenance Manual 90 8 7 Safety Protection Flowchart 8 7 1 Water Flow Failure Yes Check the water pump and pipes Check whether the water flow switch trips out Water flow failure unit st...

Page 96: ...nstallation Operation and Maintenance Manual 91 8 7 2 Freeze Protection Freeze protection unit stop Check whether the anti freeze protection switch trips out Check the water temperature Contact the af...

Page 97: ...n Operation and Maintenance Manual 92 8 7 3 High Pressure Protection High pressure protection unit stop Check the fan and setting value Contact the after sale technical support End N Yes Check whether...

Page 98: ...and Maintenance Manual 93 8 7 4 Low Pressure Protection Low pressure protection unit stop Check whether the low pressure protection switch trips out Contact the after sale technical support End No Ye...

Page 99: ...Maintenance Manual 94 8 7 5 Compressor Internal Protection Compressor internal protection unit stop Compressor internal protection switch open Check the power supply coil temperature and discharge te...

Page 100: ...nstallation Operation and Maintenance Manual 95 8 7 6 Low Oil Level Protection Low oil level protection unit stop Check whether the oil level protection switch trips out Contact the after sale technic...

Page 101: ...ntenance Manual 96 8 7 7 Oil Pressure Difference Protection Oil pressure difference protection unit stop Check whether the oil pressure difference protection switch trips out Check whether the oil fil...

Page 102: ...Check whether the fan s thermal overload protection switch trips out Check the fan s working condition and current Contact the after sale technical support End N Yes Compressor overload protection uni...

Page 103: ...n Operation and Maintenance Manual 98 8 7 10 Power Supply Failure Power supply failure unit stop Check whether the power supply module trips out Check the power supply s voltage and phase sequence Con...

Page 104: ...and Maintenance Manual 99 8 7 11Contactor Feedback Protection Contactor feedback protection unit stop Run the unit and check whether a normally open contact disconnects Check the contactor and contact...

Page 105: ...intenance Manual 100 8 7 12 High Temperature of Discharge Air Too high detection temperature unit stop Check whether the detection temperature exceeds the alarm value Yes Check the temperature of the...

Page 106: ...ischarge Temperature Sensor Temperature sensor open circuit unit stop Check whether the sensor resistance is greater than 300 Check the electrical circuit between the sensor and PLC Contact the after...

Page 107: ...remaining refrigerator oil inside the compressor and that in the system before adding new refrigerator oil and changing the drier filter Qualitative change may happen when some synthetic oil mixes up...

Page 108: ...rants High superheat of the expansion valve Adjust the superheat Too low ambient temperature Check the ambient temperature and close certain fans if necessary Too low suction pressure See F Too low su...

Page 109: ...Measure the insulation resistance value Motor failure Measure the motor insulation resistance against ground and phase to phase insulation resistance J Overload relay action of the motor used by the c...

Page 110: ...ower than 1 5 bar the water chiller unit is in abnormal status High pressure If the exhaust pressure for normal operating is lower than 6 7 bar or higher than 20 5 bar the water chiller unit is in abn...

Page 111: ...Tube Heat Exchanger Operation Procedure Low pressure bar Stop the water chiller unit and the circulating water pump Disconnect the water system of the shell and tube heat exchanger Install one acid pr...

Page 112: ...zer gradually to the sanitary tank until the pH is 7 Keep the water pump running to circulate the water until neutralization is complete Drain the water Operate the circulating water pump to clean the...

Page 113: ...s have entered the refrigerant system and need to be recovered Lubricant is undercharged and the following measures are required Measures Keep the water chiller unit running at full load for one and a...

Page 114: ...op is running at full load See the steps described in the control section When the unit operates at full load ensure that the outlet water temperature of the evaporator ranges from 5 5 C to 6 5 C View...

Page 115: ...ocess inspection Once per 3000 hours Pay attention to noise vibration and oil level In process inspection Once per 6000 hours Confirm the actions of safety and protection devices D Finned heat exchang...

Page 116: ...tector or soapsuds J Electrical control Insulation resistance Once per month The insulation resistance must be over 1 M when tested using a DC 500 V megger Wire contact performance Once per month Ensu...

Page 117: ...opriate measures must be taken to protect the unit and fire extinguishers must be accessible Wear safety glasses to protect skin or eyes from refrigerants Flush the refrigerants on skin immediately wi...

Page 118: ...ature C Outlet Water Temperature C Exhaust Pressure bar Suction Pressure bar Exhaust Temperature C Suction Temperature C 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 3...

Page 119: ...ector Content 6 months 1 year 2 years 3 years 4 years 5 years 6 years 7 years 8 years 9 years 10 years 11 years 12 years 13 years 14 years 15 years Notes 1 Fill in A B or C in the content column A Nor...

Page 120: ...Appendix 3 Maintenance Repair Record S N Failure Description Handling Measures Handling Result Recorder 1 2 3 4 5 6 7 Note Fill in the sheet and keep it carefully...

Page 121: ...ter can generate hard CaSO4 and CaSiO2 easily 6 Water rich in Fe3 Much hard scale Strong The water can generate Fe OH 3 and Fe2O3 precipitates easily 7 Water with foreign odor Much scale Quite strong...

Page 122: ......

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