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90 Chapter 7 System Operation And Maintenance

4. Add the sum of the preceding two pressures to find out the saturation temperature corresponding to the saturation
pressure.
The difference between the suction temperature at the sensing bulb and the saturation temperature is the suction
superheat degree. Try to achieve suction superheat between 5k ~ 8k.

Note

The suction superheat degree is critical to the compressor lifespan. If the compressor runs with little or no suction superheat
degree for a long time, slugging may occur to the compressor, damaging the scroll plate of the scroll compressor.

7.6.4 Thermal Expansion Valve

Operation

The auto-regulation of the thermal expansion valve guarantees sufficient refrigerant for the evaporator in order to meet
the needs of the load. The superheat degree is an indicator of the operation state of thermal expansion valve. If the
refrigerant to the evaporator is insufficient, the superheat degree will be high; and if the refrigerant to the evaporator is
too much, the superheat degree will be low. The proper superheat degree is 5k ~ 8k.

Regulation

Follow the following procedures to regulate the superheat degree setting.
1. Unscrew the bonnet at the bottom of the expansion valve.
2. Rotate the rotary switch counter clockwise to reduce the superheat degree.
3. Rotate the rotary switch clockwise to raise the superheat degree.

Note

1. Every time you rotate the rotary switch, do not rotate it for more than one round, and it may take up to 30mins to reach a new
balance.
2. Before delivery, the refrigerant of water-cooled unit has been charged, and the thermal expansion valve position has been
adjusted, so it is recommended not to adjust it on site. If you need to adjust the thermal expansion valve position, please contact
the technical support.

7.6.5 Hot Gas Bypass Valve (For Single Compressor System)

When the heat load in the room is not high, the single compressor system can regulate the indoor temperature by
using the hot gas bypass valve. In this way, the frequent use of the compressor is avoided, and energy saving effect is
realized. The hot gas bypass is shown in Figure 7-5.

进水管路

出水管路

压缩机

板式换
热器

蒸发器

膨胀阀

除湿电磁阀

Dehumidification

solenoid valve

Evaporator

Expansion valve

Hot gas bypass
solenoid valve

BPHE

Compressor

Water flow

regulating valve

Water out pipe

Water in pipe

Figure 7-5 Hot gas bypass solenoid valve

Liebert.PEX2 Series Air Conditioner User Manual

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Содержание Liebert PEX Series

Страница 1: ...User Manual ...

Страница 2: ...lation Illustration 10 2 3 3 Mechanical Parameters 11 2 4 Installing Indoor Unit 19 2 4 1 Equipment Room Requirement 19 2 4 2 Installation Space 19 2 4 3 Requirement Of Maintenance Space 20 2 4 4 Installation Procedures 21 2 5 Installing Outdoor Unit 24 2 6 Piping 24 2 6 1 Piping For Air Cooled Unit 24 2 6 2 Piping For Water Cooled Unit 28 2 7 Lowering Fan And Removing Fixtures Downflow EC Fan Sys...

Страница 3: ...1 Preparation Before Commissioning 44 4 3 2 Commissioning Procedures 44 4 3 3 Inspection After Commissioning 46 Chapter 5 iCOM Controller 47 5 1 LCD 47 5 2 Button And Indicator Panel 47 5 3 Structure Chart Of Control Menu 49 5 4 Startup Interface 49 5 5 Main Interface 49 5 6 USER MENUS 50 5 6 1 PASSWORD 50 5 6 2 SETPOINTS 50 5 6 3 EVENT LOG 50 5 6 4 GRAPHICS 51 5 6 5 SET ALARMS 51 5 6 6 SENSOR DAT...

Страница 4: ... 83 Chapter 7 System Operation And Maintenance 84 7 1 System Diagnosing Test 84 7 1 1 Self diagnosis Function 84 7 1 2 Electric Control Part 84 7 2 Filter 86 7 3 Fan Components 86 7 3 1 FC Fan 86 7 3 2 EC Fan 86 7 4 Infrared Humidifier 86 7 5 Electric Heater 88 7 6 Cooling System 89 7 6 1 Suction Pressure 89 7 6 2 Discharge Pressure 89 7 6 3 Suction Superheat Degree 89 7 6 4 Thermal Expansion Valv...

Страница 5: ......

Страница 6: ...WEB IS485 iCOM DO 1 EC Plug fan Standard Static Digit20 Sensors S Forward Curved fan Standard Static 0 None Digit9 Power Supply S Smoke Sensor 3 400V 3ph 50Hz N H High Temperature T 380V 3ph 60Hz N Hot and Cold Isle Sensor A Sensor B In addition to Standard Sensor A 460V 3ph 60Hz F Smoke High Temp Digit10 Cooling System Digit21 Packaging C Compliant Scroll Single Circuit R407C P Packaging Standard...

Страница 7: ...em only Free cool system The unit contains the compressor refrigerating system and the free cool system Free cool system can be connected with the special dry cooler Under the conditions of the low outdoor temperature the unit can select whether to run under the compressor refrigerating system or the free cool system flexibly according to the free cool medium condition provided by dry cooler and t...

Страница 8: ...rge airflow long blowing distance belt transmission and convenient maintenance Users can also select the EC fan which features high efficiency energy saving space saving and low noise EC fan unit uses elaborate structure design and the downflow unit uses the in floor design which positions the fan unit below the floor to further improve the efficiency of air supply Electric heater The spiral fin U...

Страница 9: ...own in Figure 1 3 Common screen Large screen Figure 1 3 Panel of iCOM controller 1 4 4 Remote Monitoring Software Through the configured RS485 port or TCP IP port the Liebert PEX air conditioner can communicate with the host computer and receive the control of the host software 1 5 Environmental Requirements 1 5 1 Operating Environment See Table 1 1 for operating environment requirement Table 1 1 ...

Страница 10: ... to protect the equipment The Liebert PEX series air conditioner is heavy see Table 2 1 for the weight It is recommended to use mechanical equipment such as an electric forklift to unload and move the equipment to the place closest to the installation site If an electric forklift is used insert the tines of the forklift below the pallet as shown in Figure 2 1 Align the tines with the center of gra...

Страница 11: ...panel I Then straighten all the hooks that fix side panel II and remove side panel II At last remove top cover III as shown in Figure 2 4 Kg 1790 x 950 x 2020mm 1816 x 976 x 2175mm I I III II II Figure 2 4 Removing side panels and top cover 2 Remove the base pallet The unit is fixed onto the base pallet with M10 70 fixing bolts as shown in Figure 2 5 You can use a 17mm open end spanner ratchet spa...

Страница 12: ... and the outdoor unit can be installed outdoors or on the floor of other rooms The Liebert PEX water cooled series air conditioner is designed for integrated floor installation It should be installed on the floor of the equipment room or computer room 2 Before installation make sure that the installation environment meets the requirements see 1 5 Environmental Requirements and confirm whether the ...

Страница 13: ...istributor Chilled water coil Evaporator Welding port of chilled water in out port Hose port Isolation valve sensor High pressure sensor Refrigerant HP sensor Sight glass Liquid distributor EC FC fan Low pressure sensor High pressure sensor Refrigerant Air cooled condenser Air cooled outdoor Air cooled outdoor BPHE Refrigerant 3 way ball valve 3 way ball valve condenser water or glycol liquid Wate...

Страница 14: ...or Evaporator Chilled water coil Evaporator Liquid distributor EC FC fan Liquid distributor EC FC fan Expansion valve Hot gas bypass valve Sight glass Filter drier Refrigerant Refrigerant Air cooled condenser Air cooled outdoor 3 way ball valve iCOM control Condenser water or glycol liquid Water cooled or glycol cooled Isolation valve Hose port Welding port of chilled water in out port Figure 2 7 ...

Страница 15: ...nt 2 3 2 System Installation Illustration The installation modes of the air cooled series unit are shown in Figure 2 8 and Figure 2 9 Note 1 If the condenser is installed higher than the compressor see Figure 2 8 a back bend should be fitted to the discharge line and liquid line of the condenser so as to prevent the liquid refrigerant from flowing back when the condenser stops 2 The top end of the...

Страница 16: ...than 4 C Use heaters if the water source in site cannot meet this requirement The cooling tower should be a closed loop system Closed cooling tower Exhaust water valve Strainer Drain valve Ball Supplementary valve Manometer Expansion water tank Filter Pump P T P T P T Temperature gauge valve Liebert PEX T unit M unit Figure 2 10 Arrangement of cooling water system 2 3 3 Mechanical Parameters Indoo...

Страница 17: ...970 874 2553 874 1970 One bay upflow 853 1970 8 7 4 One bay downflow 1970 853 8 7 4 1704 1704 1970 1970 874 874 Two bay upflow Two bay downflow 2553 2553 1970 1970 874 874 Three bay upflow Three bay downflow 1970 874 2553 2553 1970 874 Before installing the filter Three bay downflow Figure 2 11 Mechanical parameters of the indoor FC fan unit unit mm ...

Страница 18: ...ow Three bay upflow Figure 2 12 Mechanical parameters of the indoor EC fan upflow unit unit mm Note The indoor unit mechanical parameters of EC fan downflow unit are the same as those of FC fan unit except for P3100 and P2070 downflow dual cooling units see Figure 2 13 for its mechanical parameters Liebert PEX2 Series Air Conditioner User Manual ...

Страница 19: ...eight kg Air cooled series Water cooled series Model Dimensions W D H mm Single source cooling system Dual cooling system Single source cooling system Dual cooling system P1020 853 874 1970 320 420 320 420 P1025 853 874 1970 330 430 330 430 P1030 853 874 1970 340 440 340 440 P1035 853 874 1970 350 450 350 450 P2035 1704 874 1970 550 700 550 700 P2040 1704 874 1970 590 740 590 740 P2045 1704 874 19...

Страница 20: ...5 Two bay plenum C B A Figure 2 16 Three bay plenum Table 2 2 Plenum dimensions Type A B C One bay plenum 867 853 400 600 optional Two bay plenum 867 1704 400 600 optional Three bay plenum 867 2553 400 600 optional Note If the height of the plenum selected for air conditioner unit exceeds 600mm consult Emerson for non standard production Outdoor unit mechanical parameters See Liebert PEX Condenser...

Страница 21: ... 5 134 5 126 1133 60 100 130 60 149 255 58 78 8 100 One bay series Two bay series Three bay series CI 128 8 128 8 850 1700 103 5 78 8 136 8 CO C R CI C R CO P D H C R C R CI CO P D H P Power cable entry hole D Drain H Humidifier water in CI Chilled water in CO Chilled water out C R Cooling water in or out Refrigerant in or out Figure 2 17 Base cutout location of upflow models unit mm Liebert PEX2 ...

Страница 22: ...ure Fan aperture Fan aperture Fan aperture Fan aperture One bay series FC fan EC fan Two bay series FC fan EC fan Three bay series Fan aperture Fan aperture Fan aperture Fan aperture Fan aperture D H P Power cable entry hole D Drain H Humidifier water in CI Chilled water in CO Chilled water out C R Cooling water in or out Refrigerant in or out Figure 2 18 Base cutout location of downflow unit mm F...

Страница 23: ...0 430 400 254 509 1650 1650 724 8 794 8 740 5 740 5 35 40 210 400 430 400 498 400 254 509 2498 794 8 40 2498 740 5 740 5 720 128 89 35 724 8 One bay upflow series Two bay upflow series Three bay upflow series 89 Figure 2 19 Top cover fan aperture locations of upflow series unit mm Liebert PEX2 Series Air Conditioner User Manual ...

Страница 24: ...be damp proof 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 and the openings should be as narrow as possible 2 4 2 Installation Space Note The air conditioner can generate condensate w...

Страница 25: ...ater cooled Front 600 600 Left 600 600 Right 600 600 Back 0 0 Note 1 The space is provided for regular maintenance such as replacing strainer adjusting fan cleaning infared humidifier 2 They are the maintenance space when the water cooled unit connects water pipes on side or when the air cooled unit connects the refrigerant pipes on side If the water pipes or refrigerant pipes are laid on the bott...

Страница 26: ...e 2 24 for their positions and see Table 2 4 for the thickness 3 Determine the installation position Fix the mounting base onto the mounting position according to the site conditions and user s requirement 4 Fix the air conditioner cabinet onto the mounting base with nuts spring washers flat washers and bolts 694 850 Installation hole of 4 M8 60 sems screw 40 H 758 764 798 893 926 78 100 Rubber cu...

Страница 27: ...Rear side of cabinet Rubber cushion lateral Steel plate 1544 1700 40 764 798 H 1743 1776 758 78 100 Downflow Installation hole of 4 M8 60 sems screw Front side of cabinet Rubber cushion top Rubber cushion bottom Angle steel Base Installation hole of 4 M8 anchor bolt Rear side of cabinet Rubber cushion lateral Steel plate Figure 2 23 Mounting base appearance and dimensions of two bay series unit mm...

Страница 28: ...ber cushion top Rubber cushion bottom Angle steel Base 1544 1680 850 2550 40 H 758 2593 2626 100 78 764 798 Downflow Installation hole of 6 M8 60 sems screw Installation hole of 4 M8 anchor bolt Front side of cabinet Rear side of cabinet Rubber cushion lateral Steel plate Rubber cushion top Rubber cushion bottom Angle steel Base Figure 2 24 Mounting base appearance and dimensions of three bay seri...

Страница 29: ...Standard industry procedures must be followed in selecting laying and fixing the pipes and evacuating the system and charging refrigerant Take pipeline pressure drop oil return to the compressor and minimization of noise and vibration into consideration during design and construction General The recommended pipe sizes are equivalent lengths see Table 2 6 for equivalent lengths of partial component...

Страница 30: ...an of evaporator To the condensed water drain pipe To condensed To far infrared humidifier To condensate drain pipe To condensate pan of evaporator To condensate pan of evaporator Figure 2 25 Connection of drain pipe Note 1 A Φ25 hose clamp is delivered as an accessory to connect the drain pipe 2 When connecting the drain pipe you must make sure that the U bend is installed vertically and the U sh...

Страница 31: ...lly note that the compressor and the corresponding expansion valve of the dual refrigerant system unit should be located at both sides of the unit For example you face the unit front door No 1 system compressor is on the left hand side while the expansion valve that corresponds to No 1 compressor is on the right hand side Similarly No 2 system compressor is on the right hand side while the expansi...

Страница 32: ... 19 28 19 60m 32 19 25 16 25 19 25 19 28 19 28 19 32 19 Note 1 A pipe extension kit is required for Eq Lgth marked with 2 D discharge line L liquid line 3 Consult Emerson if the pipe length exceeds 60m z Connecting water inlet and outlet pipe of the chilled water dual cooling unit The water inlet and outlet pipe of the chilled water is connected to the chilled water unit through welding The inlet ...

Страница 33: ...rge quantity refer to step 5 in 4 2 2 Commissioning Procedures 2 Adding POE refrigerant oil The refilled refrigerant will dilute the POE refrigerant oil in the system and affect the lubricating and cooling effects of the POE refrigerant oil Therefore the POE refrigerant oil should be added See the formula below Amount of refrigerant oil ml to be added refrigerant refilling amount kg 22 6 2 6 2 Pip...

Страница 34: ... outlet pipe of chilled water dual cooling unit Refer to the corresponding content in 2 6 1 Piping For Air Cooled Unit 2 7 Lowering Fan And Removing Fixtures Downflow EC Fan System 2 7 1 Downflow Unit EC Fan Lowering After installation you must lower all fans of the EC downflow unit before commissioning You lower the fan using the supplied hand winch Each EC downflow unit is only equipped with one...

Страница 35: ...2 31 Unit beam Unit beam Winch bracket L shaped lifting component Middle round hole Fan Gaskets II Winch Handle Gaskets IV Sling Washers IV Washers II Figure 2 31 Installing winch bracket 2 Turn the handle and use the hook of the winch to hook the middle round hole see Figure 2 31 of the L shaped lifting component Adjust the handle until the sling is completely tight 3 Cut off the cable tie bindin...

Страница 36: ...he fixing bolts and washers II see Figure 2 31 totally 2 pcs to fix the L shaped lifting component and the fan installation top cover 2 Install the fixing bolts and washers IV see Figure 2 31 totally 4 pcs to fix the winch and its bracket onto the unit beams 3 Repeat the step 1 to step 7 of the one bay unit to lower all fans 4 After lowering all fans tidy the fan cables and fix them using a cable ...

Страница 37: ...collapsing due to resonation the upflow unit is especially fastened with bolts left and right symmetrical one at each side as shown in Figure 2 35 You should cut the binding string on the belt and remove the four fixing bolts before the power on operation otherwise the fan could be damaged and even cause personal injury It is necessary to hold the motor firmly while you remove the fixing bolts Cut...

Страница 38: ... result in fire The detailed operation procedures are as follows 1 Cut the cable tie and remove the protection foam fixed under the lamp as shown in Figure 2 36 and Figure 2 37 Cable hole of high water level test switch cable Cable tie Protection foam is at the bottom of metal sheet HWA cables High water level test switch cable switch cable Protection foam is fitted below the reflector switch cabl...

Страница 39: ...stallation fasteners have been fixed The pipes between the indoor unit and outdoor unit have been connected and the ball valves of the indoor unit and outdoor unit have been opened completely The condensate pump if needed has been installed The drain pipe has been connected The water supply pipe for the infrared humidifier has been connected All pipe joints have been made correctly tested The tran...

Страница 40: ...ol cables and ground cables should comply with the local and national 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 400Vac 50Hz 4 The electrical installation must be performed by qualified professional installation personnel 5 Before the wiring use a voltmeter to measure the power supply volt...

Страница 41: ... as shown in Figure 3 1 Figure 3 2 and Figure 3 3 The amplified figure of the power interface is shown in Figure 3 4 Connect terminals L1 L3 N and PE to their counterparts of external power supply Fix the input cables to the cable clamp note that the cable clamp is located on the inner side panel of the unit see Figure 3 5 for its position For the cable specification see the rated full load ampere...

Страница 42: ... unit FLA excludes the current of the outdoor unit 3 2 3 Connecting Control Cables The field connection terminals are located as shown in Figure 3 1 Figure 3 2 and Figure 3 3 The amplified figure is shown in Figure 3 6 The upper part of the terminal block is connected to the unit while the lower part serves as user control signal interfaces External alarm output of the smoke sensor Connecting smok...

Страница 43: ...tem will generate an audible alarm and the LCD of the iCOM controller will display the alarm information The terminals can be defined as follows Terminals 50 and 24 remote alarm Terminals 51 and 24 water under floor sensor in factory Terminals 55 and 24 safe switch for condensate pump optional External common alarm Terminals 75 and 76 can be connected to the external common alarms They are control...

Страница 44: ... 2 Circuit Diagram 3 3 2 Connecting Power Cables Of Outdoor Unit The power cables of the outdoor unit are connected with the miniature circuit breakers MCBs reserved in the indoor unit see Figure 4 1 Figure 4 2 and Figure 4 3 3 4 Installation Inspection After the electrical installation is completed you should confirm it according to Table 3 2 Table 3 2 Installation Inspection Items Results The po...

Страница 45: ...Figure 4 1 Figure 4 2 and Figure 4 3 The numbers in Figure 4 1 Figure 4 3 have the following definitions 1 Compressor MCB 3 Electric heater MCB 5 Condenser MCB 7 Control board MCB 2 Fan MCB 4 Infrared humidifier MCB 6 Compressor crankcase heater MCB 1 2 3 4 5 6 7 Figure 4 1 MCBs location of one bay unit 1 2 3 4 5 6 7 Figure 4 2 MCBs location of two bay unit Note The two bay series with single syst...

Страница 46: ...e equipment room is above 20 C with certain heat load Otherwise pre heat the equipment room with any heating device or by manual running the heaters of the unit in this case go through the following procedures till the third entry of 4 2 2 Commissioning Procedures first and of other equipment in the room Ensure sufficient heat load for the commissioning 10 During low ambient conditions it may be n...

Страница 47: ...anually press the infrared humidifier contactor unless there is water in the humidifier pan 4 Switch on the infrared humidifier MCB and change the humidity setpoint to start the infrared humidifier or start it manually Measure all the operation phase currents of the infrared humidifier In addition inject water manually to check that the charging pipe and drain pipe do not leak and that the drain p...

Страница 48: ...Change the humidify setting see 5 7 SERVICE MENUS to 10 lower than the indoor RH The control system should then trigger the call for dehumidification the dehumidification solenoid valve switches on the dehumidification indicator Q3 on the control board turns on Then change the humidity setting higher than the indoor RH If the dehumidification solenoid valve of the FC fan unit switches off and the ...

Страница 49: ...rs 3 Lay the power cables and the control cables away from each other 4 Check that the transportation foam block of the infrared humidifier has been removed and the high water level cables have been connected and its float mechanism operates correctly 5 Check the phase sequence 1 For the FC fan model the phase sequences of all three phase devices have been adjusted consistent before delivery Durin...

Страница 50: ...equirement is needed Then continue with the following procedures Note After commissioning restore the humidity setpoint to the default or original setpoint 6 Make sure that the chilled water source is supplied normally Change the temperature setpoint to start cooling or start cooling manually Measure all the operation phase currents of the compressor in real time Check the condensation subcooling ...

Страница 51: ... value to Tsetting hum Tsetting hum Tambient hum and then enter TEMP SET to adjust the temperature setting value Tsetting temp Tsetting temp Treturn air temp 2 Wait for 30s and the FC requirement will be triggered and the chilled water valve will be open Note After commissioning restore the temperature setpoint to the default or original setpoint 4 3 3 Inspection After Commissioning After commissi...

Страница 52: ... the backlight will be off until the next time any button is pressed 5 2 Button And Indicator Panel Nine buttons and two indicators are located on the button and indicator panel including z Indicators alarm indicator and operation indicator z Buttons ON OFF button enter button ESC button up button down button left button right button alarm silence button and help button The button and indicator pa...

Страница 53: ...the buzzer If the buzzer frequency is not 0 pressing the down button when the system is in the test state will decrease the buzzing frequency Meanwhile the buzzer will sound at the set frequency This function is used to test whether the buzzer is normal Left button 1 Select the left bit during the parameter setting operation 2 Test the LCD contrast Pressing the left button when the system is in th...

Страница 54: ...rt of the function components while the simple interface see Figure 5 4 displays the icons of current operation mode only The switching of two modes can be realized by operating the menu For details refer to 5 6 7 DISPLAY SETUP The upper left corner of the main interface displays the current unit number the upper right corner displays the current system status If there is no button operation for 2...

Страница 55: ... the parameters in the SETPOINTS submenu through the USER MENUS The left row displays the parameter codes the middle row the parameter name the right row the setpoints as shown in Table 5 4 Table 5 4 Descriptions of SETPOINTS parameters Parameters Default Setting range Description U102 TEMP SET 23 C 5 C 40 C Temperature setpoint U103 HUM SET 50 1 80 Humidity setpoint U104 HUM CTRL Rel Pred predict...

Страница 56: ...time range Table 5 5 Time range Time range Time indicated by each pixel Time range Time indicated by each pixel 8min 6s 2d 36min 32min 24s 4d 72min 1hr 45s 8d 144min 12hr 9min 16d 288min 24hr 18min The scaling of the vertical axis can also be set For the RETURN TEMP the scaling range is 3 20 for the RETURN HUMIDITY the scaling range is 10 30 The bigger the scaling range is the bigger the value eac...

Страница 57: ...nge 5 6 6 SENSOR DATA You can monitor the data acquired by the sensors through the SENSOR DATA menu The values are read only no setting or change is allowed The parameters are described in Table 5 7 Table 5 7 Descriptions of SENSOR DATA parameters Parameters Unit Description Parameters Unit Description U301 TEMP A C Temperature of sensor A U313 Hi Temp C Daily high temperature U302 HUM A Relative ...

Страница 58: ... DISPLAY Norm Norm normal Inv Display color U411 DATE m d y m d y d m y y m d Date display format 5 6 8 TOTAL RUN HRS The TOTAL RUN HRS menu records the total run time unit hr of the system components You can also set the run time limits of the system components through this menu If the actual component run time exceeds the set limit alarms will be raised This menu requires password You can reset ...

Страница 59: ... time and the second one is used to set the minute of time U607 STOP 2 0hr U607 STOP 2 0m Sleep mode end time 2 The first parameter is used to set the hour of time and the second one is used to set the minute of time U609 TIME MOD Auto Auto Yes No Timing mode setting Range Auto during the system sleep time if high low temperature occurs the system will resume operation and mask the alarm for 15min...

Страница 60: ...perature setpoint S111 HEAT DB 0K 0K 20K Heaters deadband setting range S113 HUM SET 50 1 80 Humidity setpoint S114 HUM CTRL Pred Comp Rel Pred Humidity control type S115 HUM PB 10 1 20 Humidity proportional band S116 HUM INT 5min Humidity integration time S117 HUM DB 0 1 50 Humidity deadband setting range S118 LO LIM 1 k Dehum Heat low limit 1 S119 LO LIM 2 1 7K 5 5K 1 1K Dehum Heat low limit 2 S...

Страница 61: ...on occurs on Monday of every week M MON M SUN rotate once a month The rotation occurs on Monday Sunday of the first week of the month For example M MON means rotation occurs on Monday of the first week of every month S504 ROT HOUR hr Used to set the hour of the detailed time while rotation S505 ROT MIN min Used to set the minute of the detailed time while rotation S506 ROT BY 1 1 8 The unit number...

Страница 62: ...rs Parameters Default Description S024 STARTS Number of compressor 1 starts since the last maintenance S025 RUN HRS hr Compressor 1 run hours since the last maintenance S026 AVG RUN min Average compressor 1 run time calculated through the number of starts and run hours S027 BEST 12 Starts per day best S028 WORST 240 Starts per day worst S029 HP AL 0 Number of high pressure alarms occurred to compr...

Страница 63: ...lculated through the number of starts and run hours S060 BEST 24 Starts per day best S061 WORST 240 Starts per day worst S062 ALARMS 0 Number of high pressure alarms since the last maintenance S063 BONUS 0MM Bonus amount Actual bonus calculated through the number of starts and average run time This value determines the time for the next maintenance WELLNESS HEAT3 Table 5 20 Descriptions of WELLNES...

Страница 64: ...ly start and shut down the fan respectively S315 COMP1 Off On Off Diagnosis switch of compressor 1 The On setting of this parameter can start compressor 1 only when the fan has been started S315 C1 MODE Run Run Evac Charg Compressor 1 operation mode selection S316 C1 CAP Off On Off Refrigeration capacity output of digital scroll compressor 1 S317 C1 CYCLE 0 S318 LLSV 1 Off On Off Diagnostic of liq...

Страница 65: ...ituation OK means normal ACT means the filter is clogged S349 CUSTOM1 OK OK ACT S350 CUSTOM2 OK OK ACT S351 CUSTOM3 Ok OK ACT S352 CUSTOM4 OK OK ACT States of customized alarms 1 4 OK means normality ACT means that the alarm is active and that abnormality occurs S353 HEAT SAF OK OK ACT Status heaters safety S354 FLOW AT S355 FLOW ACT S356 HP1 OK OK ACT State of high pressure switch 1 OK means norm...

Страница 66: ...ypes Description SMOKE Smoke alarm RH HU Rht Hum lockout RJTVS HTRJ TVSS WATER Water leakage alarm COMP Compressor lockout Fire Fire Alarm C PMP Cooling pump alarm Call Call for service 2 Set 2nd Setpoint FLOW Insufficient water alarm Temp High temperature alarm NoP No Power G PMP Standby pump alarm Air Air loss alarm LSI LSI STBY Standby unit alarm FC L FC lockout Cnd 1 Condensor 1 Fail C In1 Cus...

Страница 67: ...urs exceeded S292 CN2 Condensor 2 Fail S263 SMO Smoke detected S293 EFF EC Fan fail S264 WUF Water under floor S294 HST High supply air temperature S265 CPH Conderser pump high water S295 LST Low supply air temperature 5 7 7 CALIBRATION The CALIBRATION menu can calibrate sensors by setting offsets The parameters are listed in Table 5 26 The parameters are in pairs the former is the calibrated valu...

Страница 68: ...MP C 0 0K Calibrated value of temperature sensor C S631 CAL C C Calculated value of temperature sensor C S632 HUM C 0 0 Calibrated value of humidity sensor C S633 CAL C Calculated value of humidity sensor C 5 7 8 NETWORK SETUP The NETWORK SETUP menu is used to set the parameters when the system is in a network subject to the monitoring of a host See Table 5 27 for parameter descriptions Table 5 27...

Страница 69: ...et the parameters according to the equipment specific demands See Table 5 28 for detailed descriptions Table 5 28 Descriptions of OPTIONS SETUP parameters Parameters Default Setting range Description S402 COMP SEQ Auto Auto 1 compressor 1 being the primary one 2 compressor 2 being the primary one Compressor sequence Range Auto 1 compressor 1 being the primary one 2 compressor 2 being the primary o...

Страница 70: ...SSWORD LEVEL FACTORV SETUP 3 SET PASSWORDS 2 2 ACCESS ADVANCED MENUS Figure 5 10 ADVANCED MENUS 5 8 1 PASSWORD LEVEL It is operated by Emerson service personnel 5 8 2 FACTORY SETUP The FACTORY SETUP menu is displayed in nine pages The parameters are described in Table 5 29 Table 5 38 Unit code related settings Table 5 29 Descriptions of unit code related settings Parameters 1 9 Default Setting ran...

Страница 71: ...huts down DISAB shut down humidifier dehumidifier and heater only keep the cooling unit running A104 AIR LOSS SHUTD SHUTD DISAB The action to take after the loss of airflow Range SHUTD fan shuts down DISAB shut down humidifier dehumidifier and heater only keep the cooling unit running A105 COMP 0 0 2 Number of compressors A106 COMP DLY s Compressor delay time A107 COMP ON min 0 5min Compressor min...

Страница 72: ...min 3min Cooling water flush duration A137 COOL TYP SINGL Singl FC DC Three cooling type A138 STOP FC C Stop FC at setpoint or value A139 FC F DUR 0min 1min 3min Freecooling flush duration A140 FC F K11 Yes Yes No Freecooling flush starts R5 A141 COMP FC No Yes No Compressor plus FC simultaneously A142 HW F DUR 3min 0 3min Hot water flush duration A143 HG HEAT No Comp 1 Comp 2 No Hot gas heating e...

Страница 73: ...ball vavle 2 C2010 CW2 0 10V SCR Silicon controlled rectifier C2175 CW2 1 75 CONF Configurable C2210 CW2 2 10V ALBD1 AlarmBoard 1 Analog action related settings Table 5 37 Descriptions of analog action related settings Parameters 8 9 Default Setting range Description A168 AO1 STA 0 0 100 Analog output 1 start percentage A168 AO1 STA 0V 0V 10V Analog output 1 start voltage A169 AO1 END 100 0 100 An...

Страница 74: ...h the ADVANCED MENUS screen see Figure 5 11 you can view the current status of the cooled valve MBV menu is displayed in six pages and the description of the menus is listed in Table 5 39 ADVANCED MENUS MBV SETTINGS SET MBV ACCESS settings of the motorized ball valve to change level to open requested menu ESC to unselect to navigate Figure 5 11 ADVANCED MENUS screen Table 5 39 MBV settings Paramet...

Страница 75: ...General Alarm General Alarm COMP 1 HIGH PRESSURE Compressor 1 high pressure COMP 1 LOW PRESSURE Compressor 1 low pressure HIGH CW TEMP Chilled water high temperature LOSS OF CW FLOW Loss of chilled water EL HEAT HIGH TEMP Electric heater high temperature MAIN FAN OVERLOAD Main fan overload LOSS OF AIRFLOW Loss of air flow CLOGGED FILTERS Clogged filters CUSTOMER INPUT n n 1 4 Customer input n n 1 ...

Страница 76: ...ong damper position Dummy 074 Dummy alarm 074 HP 1 SENSOR FAIL High pressuresensor 1 fails HP 2 SENSOR FAIL High pressure sensor 2 fails COMP POWER REDUCTION ACTIVE Compressor power reduction active NO POWER No power UNIT DISABLED Humidification heating disabled due to unit failure UNIT SHUT DOWN Unit shutdown due to failure Low Coil Pressure 1 Low coil pressure 1 Low Coil Pressure 2 Low coil pres...

Страница 77: ...COMPRESSOR S LOCKOUT Compressor lockout AMBIENT SENSOR FAIL Ambient sensor fail HUMIDIFIER LOW AMPS Humidifier low current COMP 1 SHORT CYCLE Compressor 1 short cycle COMP 2 SHORT CYCLE Compressor 2 short cycle HUMIDIFIER HIGH AMPS Humidifier high current HUMIDIFIER LOW WATER Humidifier low water level SYSTEM OFF REQUESTED System off requested SYSTEM OFF CONFIRMED System off confirmed C2 FREEZE PR...

Страница 78: ...urn refrigerant sensor failure VALVE HRS EXCEEDED Valve has exceeded operating time limit COMP 1A HIGH PRESSURE Compressor 1A high pressure COMP 1B HIGH PRESSURE Compressor 1B high pressure COMP 2A HIGH PRESSURE Compressor 2A high pressure COMP 2B HIGH PRESSURE Compressor 2B high pressure COMP 1A HRS EXCEEDED Compressor 1A has exceeded operating time limit COMP 1B HRS EXCEEDED Compressor 1B has ex...

Страница 79: ...gure 6 1 This card can provide a network port and MIB library and you can browse the data through IE 口调试网口 Console port Network port Figure 6 1 TCP IP communication card 2 485 communication card The 485 communication card is shown in Figure 6 2 This card can provide the Modbus protocol of the RS485 port to the host 调试口 RS485 口 RS485 port Console port Figure 6 2 485 communication card 6 2 Install...

Страница 80: ... configuration 6 3 Commission Of Host Communication Component After the communication cable is connected you can start to set the HyperTerminal and communication card parameters Note Before commissioning you must enter SERVICE MEMUS of the iCOM controller to set S824 MON ADD to 3 S835 MON PORT to Vlcty and S843 BL CTRL to S R 6 3 1 Setting HyperTerminal After the 485 communication card and TCP IP ...

Страница 81: ...e name 2 Type the name tt in the Name field and click OK as shown in Figure 6 6 tt Figure 6 6 Choosing serial port 3 In the Connect To interface choose the serial port being used such as COM1 and click OK as shown in Figure 6 7 Figure 6 7 Setting port property 4 Set the communication parameters as shown in Figure 6 7 and click OK Liebert PEX2 Series Air Conditioner User Manual ...

Страница 82: ...n click OK to display the following HyperTerminal interface 2 Type 1 and the following figure will appear 3 Type 1 and the following figure will appear 4 Type 1 and select the Modbus protocol and the following figure will appear 5 Type 3 and select the ID used to communicate between the communication card and the host and the following figure will appear Liebert PEX2 Series Air Conditioner User Ma...

Страница 83: ...tting can be saved After the setting is saved the 485 communication card will be restarted 10 On the main interface typing 4 can view whether the communication status between the communication card and the Liebert PEX series air conditioner is normal as shown in the following figure 6 3 3 Setting TCP IP Communication Card Set the parameters of the TCP IP communication card according to the followi...

Страница 84: ...ult Gateway do not need to be set If the boot mode is static Type 3 4 and 5 and then respectively type the corresponding IP address Netmask and Default Gateway according to the prompt These three parameters should be given by the user 4 Press the ESC button to return to the main interface as shown in the following figure If you type x the setting can be saved After the setting is saved the TCP IP ...

Страница 85: ... set you can set the parameters of this communication card The detailed setting procedures are as follows 1 Type the IP address of the TCP IP communication card in the address bar of the IE browser If the interface shown in Figure 6 8 appears it indicates that the communication between the communication card and the iCOM controller is abnormal If the State shows Completing or In Process it indicat...

Страница 86: ...n becomes normal the interface shown in Figure 6 9 will appear Figure 6 9 Initial interface 2 2 Click the configure tab to enter the configuration interface as shown in Figure 6 10 Figure 6 10 Configuration interface Liebert PEX2 Series Air Conditioner User Manual ...

Страница 87: ...nfigure the Network Management System NMS of the host monitoring center in Figure 6 12 Click Edit and type the IP address of the NMS in IP Address Select read or write type Public in Community and then click Save Note 1 Before setting the NMS the Edit button is displayed on the interface After the configuration is edited the Edit button will become the Save button 2 After the NMS is configured you...

Страница 88: ...card Air conditioner 2 TCP IP communication card Air conditioner n TCP IP communication card Network cable connection Monitoring center Network cable connection Network cable connection Network cable connection Figure 6 14 Networking diagram of TCP IP communication card Note The single air conditioner unit does not need HUB The networking diagram of the 485 communication card Modbus protocol is sh...

Страница 89: ... Replace those loosened ones Maintenance of control part Carry out visual inspection simple function test and handle the control parts by referring to the following items 1 Visually inspect the power transformers and isolation transformers and test the output voltage of the indoor unit and outdoor condenser 2 Check that there is no signs of aging on the control interface board display control boar...

Страница 90: ...l The power supply of the smoke sensor is located at the bottom or top of the upflow or downflow unit It constantly samples the air analyzes the samples and makes judgment It requires no calibration 2 Water detection sensor Bridge the water detection sensor probes and confirm the alarm through the iCOM controller The sensor should be placed away from any water pool or drainage trench on the floor ...

Страница 91: ...nd blades Check the fan regularly to make sure the bearing is secure Rotate the blades and make sure that they do not contact the housing Because the bearing is permanently sealed and self lubricated check for signs of wearing when adjusting the belt Roll the belt and observe the motion of the fan bearing If any abnormal displacement is observed replace the bearing Belt Measure the belt tension wi...

Страница 92: ... switch 2 Unplug all the control cables of the infrared humidifier and cut the fixing cable tie binding the infrared humidifier power cable In the one bay system the plugs of the infrared humidifier are sealed in the niche above the lamp and you need to open the cover plate in front of the infrared humidifier before you can reach the plugs The plugs of the two bay system and three bay system are l...

Страница 93: ...he water pan surface According to the different parts of the water quality you can set the water volume yourself In general the water volume can be adjusted from 110 to 500 in 1 increments default 150 The automatic flushing system washes the water pan of the infrared humidifier to prevent erosion caused by sediment minerals produced in the water As the water source regulation is different the wate...

Страница 94: ...ssure switch On the other hand too high suction pressure will undermine the cooling effect of the refrigerant on the compressor motor leading to the damage of the compressor The minimum pressure switch action setpoint and the maximum design operation value suction pressures are listed in Table 7 1 Table 7 1 Suction pressure System Minimum pressure kPa PSIG R22 Maximum pressure kPa PSIG R22 Air coo...

Страница 95: ...ollowing procedures to regulate the superheat degree setting 1 Unscrew the bonnet at the bottom of the expansion valve 2 Rotate the rotary switch counter clockwise to reduce the superheat degree 3 Rotate the rotary switch clockwise to raise the superheat degree Note 1 Every time you rotate the rotary switch do not rotate it for more than one round and it may take up to 30mins to reach a new balanc...

Страница 96: ...get burned the cause is usually mechanical problem or poor lubrication in other words due to over temperature If the causes that lead to the compressor failure could be discovered and corrected in time most failures are avoidable The maintenance personnel should check the operation situation periodically and take necessary measures to ensure the system normal operation This practice is both easy a...

Страница 97: ...faulty compressor The compressor of the downflow fan unit has a higher location so each unit is configured with compressor replacement frock For details see label indication pasted behind the left front door of the unit 6 If the compressor has been entirely burned you need to clean the pipes of the cooling system and replace the filter drier Note Do not remove the rubber bungs from the suction ope...

Страница 98: ...t on please check further whether LED DS4 beside F4 on the fuse panel is on or take down F4 to test whether it is burnt out Air flow loss switch alarm action 1 Check that the belt is firm and the fan motor is normal 2 Check whether the external static pressure ESP is too high if so fix it by optimizing the air channel and adjusting the belt setting value properly FC fan cannot be started The fan i...

Страница 99: ...actor and measure the circuit voltage Contactor closed but compressor cannot start Compressor internal circuit breaker open Check the compressor coils If the coils are open they will reset automatically after they cool down Compressor stops after running for 5min 1min 5min settable Or contactor opens Refrigerant leaked the LP switch cannot close or the pressure reading from the LP sensor of the du...

Страница 100: ... and return system Low condensing pressure Check the condenser Belt slipped Check the belt and make necessary adjustment or replacement The single source cooling unit configured with FC fan its dehumidification electromagnetic valve is closed Check the status of the dehumidification electromagnetic valve when the system has no dehumidification requirement Examine whether there is 24Vac voltage bet...

Страница 101: ...rature exceed S138 Maybe the reason is that the water inlet temperature is too high or the unit preset temperature is too low you can properly reduce S138 preset value to start FC Note that too low S138 preset value may result in the larger temperature change in equipment room Note The refrigerant requirement is the precondition for judging the potential causes listed in this Table Table 8 3 Troub...

Страница 102: ...the power supply and measure the resistance of the heater with an Ohm meter Affiliated table 1 Monthly maintenance table Inspection date ___________________ Prepared by ___________________ Unit model ___________________ Unit SN ___________________ Filters ___ 1 Check for clogging or damage ___ 2 Check the filter clog switch ___ 3 Clean the filter Fan ___ 1 Fan blades are not distorted ___ 2 Whethe...

Страница 103: ...upported ___ 8 Check and fasten the circuit connections Water cooled condenser if used ___ 1 Clean the water pipe system ___ 2 Check the electric valve ___ 3 Check for leakage Refrigeration cycling system ___ 1 Check the suction pressure and suction superheat degree ___ 2 Check the discharge pressure and condensing subcooling degree ___ 3 Check the refrigerant pipes ___ 4 Check the moisture conten...

Страница 104: ...MCB 15 Control board contactor 22 Main N terminal 2 Busbar 9 Fuse board 16 Condenser contactor 23 Main grounding terminal 3 Fan MCB 10 Control board 17 Humidification contactor 24 Fan contactor 4 Electric heater MCB 11 Field connection terminal block 18 Electric heater contactor 25 Temp hum sensor board 5 Infrared humidifier MCB 12 Isolation transformer 19 Fan over current protector 6 Condenser MC...

Страница 105: ...use board 16 Condenser contactor 23 Main grounding terminal 3 Fan MCB 10 Control board 17 Humidification contactor 24 Fan contactor 4 Electric heater MCB 11 Field connection terminal block 18 Electric heater contactor 25 Temp hum sensor board 5 Infrared humidifier MCB 12 Isolation transformer 19 Fan over current protector 6 Condenser MCB 13 Power transformer 20 Compressor contactor 7 Crankcase hea...

Страница 106: ...ORS T6 ISOLATION TRANSFORMER T1 UNIT CONTROL TRANSFORMER TH TEMPERATURE SENSOR Q18 NOT USED Q17 NOT USED Q15 NOT USED Q14 COMPRESSOR NO 1 TRIAC TRIAC HOT GAS BYPASS 1 Q13 Q12 LIQUID LINE SOLENOID NO 1 TRIAC Q10 COMPRESSOR NO 2 TRIAC Q9 HOT GAS BYPASS 2 TRIAC Q8 LIQUID LINE SOLENOID NO 2 TRIAC Q6 HUMIDIFIER MAKE UP TRIAC Q5 MAIN FAN TRIAC Q4 HUMIDIFICATION TRIAC DE HUMIDIFICATION VALVE Q3 Q2 REHEAT...

Страница 107: ...e H U 316 Lo Hu M U316 Lo Hu S U316 Lo Humi U402 YEAR U402 MONTH U402 DAY U403 HOUR U403 MINUTE U403 SECOND U404 TEMP F C U405 CONTRAST U406 BUZ FREQ U406 BUZ TEST U401 LANGUAGE U407 BACKLITE U408 SCREEN U409 SHOWS U410 DISPLAY U411 DATE U502 LIMIT U503 COMP1 U503 LIMIT U504 COMP2 U504 LIMIT U505 CW FC U505 LIMIT U506 HG HW U506 LIMIT U507 EL HEAT1 U502 MOTOR S U507 LIMIT U508 EL HEAT2 U508 LIMIT ...

Страница 108: ...T S084 ALARMS S085 BONUS S130 S131 VPULS S832 NW STAT S835 MON PROT S836 IP 1 S836 IP 2 S832 NW CTRL S831 CS STAT S836 S837 NM 2 S837 NM 3 S837 NM 4 S838 GW 1 S837 NM 1 S836 IP 4 IP 3 S838 GW 4 S840 U2U PROT S841 U2U ADD S842 U2U GRP S838 GW 3 S838 GW 2 S843 BL CTRL S844 SR STAT S844 SR CTRL S843 BL STAT S425 FC FLUSH S426 HW FLUSH S427 BALL OFF S039 WORST S040 HP AL SUINT SUP DB S042 OL AL S043 D...

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