Emerson CR025 User Manual Download

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Appendix 1 Circuit Diagram 55

Liebert.CRV+ Series Air Cooled Precision Air Conditioner User Manual

Appendix 1 Circuit Diagram

Figure 1 CR035 circuit diagram

Summary of Contents for CR025

Page 1: ...sers may contact the nearest Emerson local sales office or service center Copyright 2014 by Emerson Network Power Co Ltd All rights reserved The contents in this document are subject to change without notice Emerson Network Power Co Ltd Address Block B2 Nanshan I Park No 1001 Xueyuan Road Nanshan District Shenzhen 518055 P R China Homepage www emersonnetworkpower com cn E mail overseas support eme...

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Page 3: ... 3 2 System Arrangement 8 3 2 1 General Arrangement 8 3 2 2 System Installation Mode 9 3 2 3 Mechanical Parameters 10 3 3 Installation Procedures 12 3 3 1 Leveling The Cabinet 12 3 3 2 Removing Feet And Fixing Cabinet 12 3 3 3 Cabinet Connection 13 3 4 Piping 14 3 4 1 Removing Filters 14 3 4 2 Connecting Condensed Water Drainage Pipe Of Indoor Unit 15 3 4 3 Connecting Water Inlet Pipe Of Electrode...

Page 4: ...troller 31 6 1 Feature 31 6 2 Appearance 31 6 3 LCD Screen 31 6 4 Control Button 32 6 4 1 Function Descriptions 32 6 4 2 Operation Example 32 6 5 Control Screen 33 6 5 1 ON Screen 33 6 5 2 Normal Screen 33 6 5 3 Password Screen 34 6 6 Menu Structure 34 6 6 1 Main Menu 34 6 6 2 Alarm Menu 35 6 6 3 Temp Hum Set 38 6 6 4 System State 39 6 6 5 System Set 41 6 6 6 Help Menu 43 6 6 7 Display Set 44 Chap...

Page 5: ...uction Pressure 50 7 9 2 Discharge Pressure 50 7 9 3 Electronic Expansion Valve 51 7 9 4 Air Cooled Condensor 51 7 9 5 Compressor 51 7 10 Drainage System Maintenance Guidance 52 Chapter 8 Troubleshooting 53 Appendix 1 Circuit Diagram 55 Appendix 2 Menu Structure Of Micro Processing Controller 57 Appendix 3 Alarm Control Menu Table 59 Appendix 4 Hazardous Substances or Elements Announcement 60 Appe...

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Page 7: ...n controller operation system operation and maintenance and troubleshooting etc The system operation and maintenance trouble shooting and handling are only limited to simple maintenance For the maintenance and troubleshooting works not mentioned in this manual please contact Emerson professional engineer The startup and commissioning is not described in detail in this manual because they will be c...

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Page 9: ...dard configuration and it can reduce noise pollution to environment to greatest extent on the base of satisfying system cooling requirement and improve reliability of operation 1 2 Nomenclature of the CRV Air Cooled AC Unit The nomenclature of the CRV air cooled AC unit is shown in Figure 1 1 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 C R 0 2 5 H A 1 3 8 O S 0 2 E 1 0 0 0 0 ...

Page 10: ...o individual model to ensure that the refrigerant is distributed evenly in each loop improving the efficiency of the heat exchanger to a great extent Electronic expansion valve Adopt an electronic expansion valve It collects temperature and pressure signals at the same time to accurately regulate the refrigerant flow Electrode humidifier Electrode humidifier adopts a simple structure form with lar...

Page 11: ...o restoration function and high low voltage protection function The operation time of components is available through the menus The expert level fault diagnosis system can automatically display the current fault information facilitating the maintenance It can store up to 200 historical event records An RS485 port is configured and Modbus protocol is used Remote Monitoring Software The CRV air cool...

Page 12: ...heat insulation and sealed damp proof layer The damp proof layer of the ceiling and walls must use polyethylene film or damp proof coating 3 The outdoor air that enters the equipment room should be reduced to a minimum better below 5 of the total indoor airflow as it may increase the load of heating cooling humidifying and dehumidification of the system 4 All the doors and windows should be closed...

Page 13: ... 3N 50Hz 2 3 2 Storage Environment See Table 2 3 for details Table 2 3 Storage environment requirement Item Requirement Storage environment Indoor clean without dust Ambient humidity 95 RH Ambient temperature 33 C 70 C Storage time Total transportation and storage time should not exceed six months Otherwise the performance needs to be re calibrated 2 4 Movement Unpacking And Inspection 2 4 1 Trans...

Page 14: ...ses packing of honeycomb cardboard and winding stretch film Move the product to the place closest to the final installation site before unpacking the unit Follow the procedures below to unpack the unit 1 First remove the top cover and the winding stretch film and then remove the honeycomb cardboard as shown in Figure 2 4 Top cover 1 Remove the top cover 2 First remove the winding stretch film and ...

Page 15: ...ratchet spanner or sleeve to remove the screws Hexagon head bolt GB T 5782 2000_M8 80 Screw GB9074_13 88_M8 20 Figure 2 5 Screws on pallet 2 4 3 Inspection After unpacking the product check against the packing list that the fittings are complete and that the components are intact If any parts are found missing or damaged please report to the carrier immediately If any covert defects are found plea...

Page 16: ... 1 The CRV air cooled AC unit is designed for split floor installation The indoor unit must be installed on the floor of the equipment room or computer room and the outdoor unit can be installed outdoors or on the floor of other rooms 2 Before the installation make sure that the installation environment meets the requirements refer to 2 3 Environmental Requirements and confirm whether the building...

Page 17: ...e The unit installation mode is shown in Figure 3 2 and Figure 3 3 Back bend must be higher than the highest copper pipe of the condenser Heat insulation floor Floor Sealed Raised floor Humidifier water in Condensed water out Indoor unit Liquid line avoid exposure to direct sunlight Trap Slope discharge Max 7 5m Max 30m Outdoor unit Figure 3 2 Condenser installed higher than compressor Heat insula...

Page 18: ...indoor unit are shown in Figure 3 4 and Table 3 1 H W D Figure 3 4 Mechanical parameters of indoor unit unit mm Table 3 1 Mechanical parameters of indoor unit Model Dimensions W D H mm Net weight kg CR025HA1380S02E10000PV000 300 1100 2000 250 CR025RA138SS12E10000PV000 260 CR035HA1380S02E10000PV000 600 1100 2000 315 CR035RA138SS12E10000PV000 335 Base plate pipe outlet locations dimensions The locat...

Page 19: ...3 for their dimensions a b c d e g h A B C D E f F a b c d e A B C D f g E F CR035 unit CR025 unit A Inlet hole of humidifier B Drainage hole of pump C Liquid pipe hole D Discharge pipe hole E Cable entry hole F Cable entry hole Figure 3 6 Locations of top plate pipe outlet Table 3 3 Locations and dimensions of top plate pipe outlet unit mm Model a b c d e f g h CR025 40 80 40 125 100 45 105 CR035...

Page 20: ...gure 3 8 Closkwise Hexagon bolt Fixing nut Counter closewise or clockwise The feet rise or drop Figure 3 8 Leveling the cabinet 4 Screw down the fixing nuts on the feet bolts counter clockwise and the leveling is finished If the machine room has mounting bracket and its width does not exceed 30mm you need to remove the feet and fix the cabinet onto the mounting bracket 3 3 2 Removing Feet And Fixi...

Page 21: ...Refer to 3 3 1 Leveling The Cabinet in this section for the method Procedures for connecting the cabinet 1 Loosen the fixing screw of the cabinet connector on the cabinet frame and rotate the cabinet connector 90 to horizontal position and use M5 countersunk head screws to fix it on the cabinet frame side of the door lock as shown in Figure 3 10 Cabinet connector Cabinet connector Figure 3 10 Rota...

Page 22: ...he refrigerating pipes must be silver brazed The selection layout and fixing of the pipes shall comply with industrial standard Vacuum pumping and refrigerant charging operations are subject to industry standards Pressure drop compressor oil return noise reduction and vibration shall be considered in design and installation 3 4 1 Removing Filters Remove the filters before the pipes of the indoor u...

Page 23: ...p is15kg cm The outside diameter of copper pipe is12 7mm and the inside diameter of soft pipe is 9mm If the unit isn t configured with pump the drainage pipe of water tray enough length is reserved at factory and the inside diameter of the pipe is 16mm should go through the drainage hole of tray as shown in Figure 3 14 and connecting to outer drainage pipe The trap is necessary to drain the conden...

Page 24: ... Figure 3 16 the pile connector has been connected 1 2 BSP on top of the cabinet if you need to fill water from the bottom unscrew the connector connected with the copper pipe 3 4 GAS of the water inlet soft pipe of humidifier lead the water inlet soft pipe through the rubber plug hole close to the humidifier and connect it to the outer water inlet pipe Screw down the threaded connector on the wat...

Page 25: ...under the raised floor included Note For bottom piping before welding the compressor discharge pipe and liquid pipe follow the requirement labeled on the copper pipe use a cutter to cut off the copper pipe a small quantity of compressor lubricating oil may leak and do not weld the copper cap on the seal directly lest the oil in the copper pipe should be heated and catch fire The exposure time of s...

Page 26: ...r OD of liquid pipe inch Equivalent length m 90 bend 45 bend T type three way 3 8 0 21 0 10 0 76 1 2 0 24 0 12 0 76 5 8 0 27 0 15 0 76 3 4 0 3 0 18 0 76 7 8 0 44 0 24 1 1 1 1 8 0 56 0 3 1 4 Note A trap should be installed for every 7 5m of vertical distance Please consult Emerson for details During the installation of the pipe extension kit to avoid the pipe opening it is recommended to install th...

Page 27: ...le of solenoid valve 5 Put the solenoid valve on the body press tightly so as to coil and body completely fastening as shown in Figure 3 20 Figure 3 20 Fixing the valve coil 3 4 6 Charging Refrigerant And Adding Refrigeration Oil 1 Charging refrigerant The CRV air cooled AC unit has been charged in factory with 2bar nitrogen to keep the pressure Table 3 7 and Table 3 8 give standard charging amoun...

Page 28: ...efilling amount kg Standard refrigerant charging amount of indoor unit refrigerant refilling amount of per meter liquid pipe kg m total length of extended liquid pipe m See Table 3 10 for refrigerant refilling amount of each meter liquid pipe Total length of extended liquid pipe m Total length of liquid pipe m 10m Table 3 10 Refrigerant refilling amount of per meter liquid pipe with different ODs ...

Page 29: ... and crack of the copper pipe vibration absorbing foams are fitted between them Remove these objects and do cleaning before installation and commissioning Removing limiting piece of electrical control box To prevent the electrical control box from moving during transportation a limiting piece of electrical control box is installed before delivery You need to remove the limiting piece before operat...

Page 30: ...n inspection Item Result Sufficient space is kept for maintenance according to the user manual The equipment is placed vertically and mounting fasteners are fastened The pipes between the indoor unit and outdoor unit are completed The ball valves of the indoor unit and outdoor unit are fully opened The wind direction of the wind leading grill has been adjusted if required Drainage pipe is connecte...

Page 31: ...tional electrician regulations 2 See the unit nameplate for the full load current The cable sizes should meet the local wiring rules 3 Mains supply requirement 380 415 V 10 50Hz 3N 4 The power soft cable is Y type connection If the power soft cable is damaged its replacement must be performed by professional maintenance personnel 5 The electrical installation and maintenance work must be performed...

Page 32: ...ounterparts of external power supply respectively Fix the input cables to the cable clamp which is located on the inner side panel of the unit as shown in Figure 4 1 For the cable specification see the unit full load current FLA listed in Table 4 1 The top cable entry hole and bottom cable entry hole are shown in Figure 4 2 顶部进线孔顶部进线孔 Top cable entryhole 底部进线孔顶部进线孔底部进线孔 Bottom cable entryhole F...

Page 33: ...ou should connect one end of the sensor to terminal 51 and the other end to the common terminal 24 Each unit can be connected with any number of sensors in parallel but only has one water under floor alarm SIC card If an SIC card is equipped you should connect A B GND 12 on the SIC card to the counterparts on the terminal block respectively Refer to Appendix 1 Circuit Diagram for details Rack sens...

Page 34: ...erminals of the outdoor unit Their on and off state is the same as that of the compressor 2 They can be connected to the compressor rotation speed control terminals on the control board of the outdoor unit or you can choose not to connect them External common alarm Terminals 75 and 76 can be connected to the external common alarms They output signals to external alarm devices such as an alarm indi...

Page 35: ...ck item Result The control connections are completed properly All wiring and connector connections are tight The fixing bolts are tight After confirming the preceding points you can start the commissioning operation Do not power on the unit until Emerson authorized technical has checked and confirmed the unit ...

Page 36: ...missioning Mechanical part 1 According to the indicating label on the valve open all valves in the refrigerant loop 2 The cooling pipe system has past the pressure leakage test 3 Ensure that the refrigerant has been correctly charged 4 The total charge quantity has been roughly calculated If the required charge quantity exceeds the standard one the rated amount of refrigerant oil should have been ...

Page 37: ...y in the cooling system usually charge until the pressures inside the refrigerant container equalizes with that in the cooling system Connect the composite pressure gauge to the refrigerant cylinder Note to exhaust the air inside the tube of the gauge Static charging charging before startup connect the high and low pressure composite pressure gauge to the needle valve on the ball valve of liquid p...

Page 38: ...r suction pipes and make sure there is no water condensing on the surface of the compressor and the pipes so as to avoid the risk of slugging the compressor The unit discharging overheating degree is within 25 C 50 C 5 2 3 Checklist For Completed Commissioning After commissioning confirm the items listed in Table 5 1 Table 5 1 Inspection after commissioning Check item Result Check that all output ...

Page 39: ...menu operation 6 The expert level fault diagnose system can automatically display the current fault information to facilitate maintenance personnel in equipment maintenance 7 Store up to 200 historical alarm records 8 Configured with an RS485 port Adopt MODBUS RTU communication protocol 6 2 Appearance The appearance of the micro processing controller is shown in Figure 6 1 Run indicator Alarm indi...

Page 40: ...nge silence the audible alarm Up button Move the cursor up or increase the parameter value For a toggle selection scroll through the options For a multi screen menu scroll up the screen Down button Move the cursor down or decrease the parameter value For a toggle selection scroll through the options For a multi screen menu scroll down the screen 6 4 2 Operation Example Example 1 Inputting password...

Page 41: ...mal screen will be displayed after 10 seconds startup delay as shown in Figure 6 5 In the upper part of the Normal screen it displays the settings and actual values of current air supply temperature first queue humidity second queue and air return temperature the third queue displays air return temperature by default when the compressor mode or fan mode is set to Remote the queue displays remote t...

Page 42: ...l Browse all menu information Set all parameters Level 3 Factory technician For detailed operation on entering the password refer to 6 4 2 Operation Example If entering a wrong password you can only view the menu but cannot change the settings In this case you can press the Esc button to return to the Normal screen and then press the Enter button to enter the Password screen again Note If pressing...

Page 43: ...m Menu on Main Menu screen to enter the screen shown in Figure 6 8 Press the Up or Down button to scroll up or down the menu items Figure 6 8 Alarm Menu Active Alarm The Active Alarm menu is used to monitor the present alarm status of the AC unit and prompt No Alarm or detailed alarm status information The detailed alarm status information includes XX YY alarm type and alarm start time as shown in...

Page 44: ...h pressure abnormal records if more than one high pressure abnormality is activated Up to 50 high pressure abnormal records can be stored They will not be cleared upon system power off Alarm Set Select Alarm Set on the Alarm Menu screen to enter the screen shown in Figure 6 12 Press the Up or Down button to scroll through the menus The Alarm Set settings will not be lost when the power fails Note ...

Page 45: ...o Exh SH Lo Exh Lock HP Abnor HP Alm HP Lock LP Alm LP Lock LP Sen Lock Water Alm Water UF Fan Alm Heat Alarm and Remote Alm are serious fault alarms So they cannot be set to OFF but can only be set to ENA and DISA Sensor Alarm Select Sensor Alarm on the Alarm Set screen to enter the screen shown in Figure 6 15 Press the Up or Down button to scroll through the menus Figure 6 15 Sensor Alarm Menu N...

Page 46: ...ess the Up or Down button to scroll through the menus Figure 6 17 EEV Alarm Menu Note The EEV Alarms are serious fault alarms So they cannot be set to OFF but can only be set to ENA and DISA Alarm Process Select Alarm Process on the Alarm Set screen to enter the screen shown in Figure 6 18 Press the Up or Down button to scroll through the menus Figure 6 18 Alarm Process Menu 6 6 3 Temp Hum Set Sel...

Page 47: ...temperature settings is set through Rem Stpt When the same mode is selected for Comp Mode and Fan Mode the temperature settings are also the same when different modes are selected an extra item of Fan T will appear in the menu the temperature settings plus Fan T is the target temperature of fan operation 6 6 4 System State Move cursor to System State in Main Menu screen to enter system state scree...

Page 48: ...Signal Menu Switch Signal The Switch Signal menu is shown in Figure 6 23 You can view the current input output states of devices through the menu HP Sw OFF Water Lv OFF Water Alm OFF Remote Sw ON Figure 6 23 Switch Signal Menu Run Time The Run Time menu is shown in Figure 6 24 The run time will not be cleared upon power off You can view the running time of the main components through this menu Fig...

Page 49: ...an On Off Record Menu 6 6 5 System Set Select System Set on Main Menu screen to enter the screen shown in Figure 6 27 The parameters of System Set will not be cleared upon power off Figure 6 27 System Set Menu Common Set The Common Set screen is shown in Figure 6 28 Figure 6 28 Common Set Menu Restore factory On the Common Set screen press the Up or Down button to move the cursor to Rst Facty and ...

Page 50: ...e use it with caution Fan Set The Fan Set screen is shown in Figure 6 29 Figure 6 29 Fan Set Menu Note Fan1 State Fan4 State are read only values If 35kW is selected for Type Sel in Common Set menu only Fan1 State and Fan2 State will be displayed Comp Set The Comp Set screen is shown in Figure 6 30 Figure 6 30 Comp Set Menu EEV Set The EEV Set screen is shown in Figure 6 31 Figure 6 31 EEV Set Men...

Page 51: ...Vacucm State NO Lquid Valve OFF Figure 6 32 Manual Mode Menu Note It is recommended not to operate the Manual Mode by the user if necessary please operate it by professional personnel You must quit the manual mode manually Sel ected Option Sel Option for short The Sel Option screen is shown in Figure 6 33 The parameters of remote temperature adjustment will not be cleared upon power off Figure 6 3...

Page 52: ...ill not be changed Figure 6 35 Date Time Menu Password The Password setting will not be lost when the power fails The menu screen is shown in Figure 6 36 Figure 6 36 Password Menu Version Info The Version Info menu is used to view the software version as shown in Figure 6 37 Figure 6 37 Version Info Menu 6 6 7 Display Set Select Display Set on Main Menu screen to enter the Display Set screen as sh...

Page 53: ...clogging or damage Check the filter clogging switch Clean the filter Fan Fan blades are not distorted The bearings are not worn out Compressor Check for leakage Listen to the operation sound observe the operation vibration Air cooled condenser Make sure condenser coil is clear from dirt and debris Clean if required The fan base should be firm The fan vibration absorber is not deteriorated or damag...

Page 54: ...s you to turn on off the components onsite manually so as to check their functionality 7 4 Electric Control Part 7 4 1 Maintenance Of Electric Part Carry out visual inspection and handling over the electrical connection by referring to the following items 1 Conduct electrical insulation on system to find out bad electrical connection and contacts Disconect all fuses and MCBs of the control part du...

Page 55: ...sion to proof read and calibrate the temperature humidity sensor 10 Regulate the setting point and inspect the action of various function components according to the control logic 11 Simulate and inspect the working states of protection units such as high low pressure alarm high low temperature alarm high water level alarm and over temperature protection 12 Check sensors 7 4 3 Water Leak Detector ...

Page 56: ...oard and the alarm point of the EC fan are connected in series when the rotating speed of the EC fan is abnormal the unit will generate an EC fan fault alarm Note Turn off the unit Fan before replacing the filter The speed regulating control board of the outdoor EC fan has a risk of strong electric shock it is strictly prohibited from touching it when the power is on During the unit operating peri...

Page 57: ...se the sediment exists in the water drained from the humidifier the humidifier tray should be cleaned periodically to avoid clogging the tray and the drainage pipe The cleaning cycle varies with the water quality and humidification operation time It is recommended to clean when necessary the humidifier tray once a month The humidifier tray is shown in Figure 7 4 Figure 7 4 Humidifier tray If the w...

Page 58: ...aults regular checking is a major means to prevent most system faults The refrigerant pipes must be supported by properly set brackets and be laid away from the wall floor or anywhere that vibrates Check the refrigerant pipes once every six months to make sure that they are not worn out and the fixing brackets are not loosened Each system has a sight glass to facilitate the observation of refriger...

Page 59: ...cessing polluted parts The Liebert CRV system uses the DC brushless scroll compressor with high efficiency and high reliability The engineering construction must be performed by following correct procedures strictly It is rare for the motor of the compressor to get burned due to invalid insulation In the few cases when the motor does get burned the cause is usually mechanical or due to poor lubric...

Page 60: ...roper usage of the product thus is not covered by the warranty When the compressor is entirely burned you need to replace the filter drier together with the compressor In addition check the expansion valve If the valve is faulty replace it too Before the replacement you must clean the system If you are unsure about the cleaning method please consult with Emerson service personnel 7 10 Drainage Sys...

Page 61: ...failure phase loss and low voltage 2 Check that the analog output is within the required range of 0 10Vdc 3 Check if the motor is clogged due to large current 4 Check if the motor is too hot 5 Hall failure If the previous three problems occur the motor can restore normal operation after the faults are cleared If the motor is too hot you need to cut off the fan power after the motor is cooled you c...

Page 62: ...ystem does not start Check the condensing fan for air cooled system Too much refrigerant has been charged Check whether the subcooling degree is too high Low exhaust pressure Refrigerant leaked Locate the leakage point repair it and add refrigerant Fan speed controller of outdoor unit is faulty while the output voltage remains 100 regardless of the change of condensing pressure If the fan speed co...

Page 63: ...Appendix 1 Circuit Diagram 55 Liebert CRV Series Air Cooled Precision Air Conditioner User Manual Appendix 1 Circuit Diagram Figure 1 CR035 circuit diagram ...

Page 64: ...Remote sensor10 2 4 6 1 5 Heat breaker QF2 3 A1 A2 2 1 4 3 6 5 22 21 Heat contactor KM2 N N ST1 C ST1 NC Heat alarm N A1 B1 12V GND J1 1 J1 2 ST2 C ST2 NC Optional 94 95 EEV 153 SO4FI High pressure alarm 70 71 Connection bars N A1 B1 12 00 Terminal block GNDGND 12V12V B1 B1 24V24V 0V A1 A1 00 12 N N N N A1 B1 G1010V 51 24 37 38 70 71 75 76 A2 B2 12VGND 94 95 TB1 TB2 TB3 GND12V High pressure sensor...

Page 65: ...pendix 2 Menu Structure Of Micro Processing Controller 57 Liebert CRV Series Air Cooled Precision Air Conditioner User Manual Appendix 2 Menu Structure Of Micro Processing Controller Remote Alm Help Menu ...

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Page 67: ...Exh Temp Water UF Fan Power Module Fail Lo Exh SH Water Alm Com Fail of EEV Hi Ret Temp Filt Alm No Rfg Sel Lo Sup Temp Filt Maint Loss Rfg Hi Sup Temp Air Lost Suc Temp Sensor Alarm Hi Ret Hum Lp Sen Lock LP Pressure Sensor Fail Lo Ret Hum Remote Alm Com Fail of CP Driv HP Lock Ret Temp Sensor Alarm Driv Fail LP Lock Ret Hum Sensor Alarm Hi HS Temp Hi Exh Lock Air Temp Sensor Alarm Comp OC Lo Exh...

Page 68: ...ually eliminate the harzardous substances in the products through unremitting efforts in research However limited by the current technical level the following parts still contain harzardous substances due to the lack of reliable substitute or mature solution 1 The reason that the above parts contain plumbum copper alloy high temperature solders in the products and diode glass part of resistor exem...

Page 69: ...ion Air cooled condenser if used ___ 1 Check the fins cleanness ___ 2 The fan base should be firm ___ 3 The fan vibration absorber is not deteriorated or damaged ___ 4 The SPD board should be effective in the storming seasons the SPD board should be check once a week ___ 5 The refrigerant pipes are properly supported Refrigeration cycling system ___ 1 Check the suction pressure ___ 2 Check the dis...

Page 70: ...easons the SPD board should be check once a week ___ 5 Check the voltage regulating function of the rotation speed controller ___ 6 The temperature switch is set at the required position ___ 7 The refrigerant pipes are properly supported ___ 8 Check and fasten the circuit connections Refrigeration cycling system ___ 1 Check the suction pressure and suction superheat degree ___ 2 Check the discharg...

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