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Daikin EWWDC11CJYNN [95/180] Freeze up control
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ESIE07-05 Functional Control
Part 2 – Functional Description 2–57
3
2
4
5
1
2.6 Freeze-up Control
Introduction Freeze up control is used to protect the evaporator against accidentally freezing.
Two protections are present: freeze-up prevention and Anti-freeze alarm.
Freeze-up
prevention
Freeze-up prevention will request a load-down when the temperature of the evaporator outlet gets
below 3°C (freeze prevention setpoint).
The unit will go back to normal operation (possibility to load up) when the outlet temperature gets
above freeze prevention setpoint + diff.
Anti-freeze alarm When the evaporator outlet water temperature drops below Anti-freeze alarm setpoint (2°C) the
Anti-freeze protection is activated and the unit will shutdown. When the temperature rises above the
Anti-freeze setpoint + diff (3°C) it is possible to reset the Anti-freeze alarm.
Remark: In case of 2 evaporators, each evaporator has its own Anti-freeze alarm setpoints
Characteristics Freeze-up prevention
Control device Sensor (1 sensor at each evaporator outlet)
Diagram name
Activation Outlet water temp < Freeze prevention setpoint
(3°C)
Result Load down compressor
Reset Outlet water temp > Freeze prevention setpoint
+ diff (4°C)
Result Normal mode
Characteristics Anti-freeze alarm
Control device Sensor (1 sensor at each evaporator outlet)
Diagram name
Activation Outlet water temp < Anti-freeze setpoint (2°C
for standard unit)
Result Unit disabled
Result Manual reset
Manual reset possible when outlet temp is
above Anti-freeze setpoint + diff.
Содержание
- Esie07 05 1
- Ewwd340 c19cjynn 1
- Service manual 1
- Water cooled screw chillers 1
- General outline 3
- Introduction 3
- Part 1 system outline 3
- Piping layout 3
- Table of contents 3
- Functional control 4
- Part 2 functional description 4
- Part 3 troubleshooting 4
- Procedure for software upload download 4
- The digital controller 4
- Appendix a 5
- Maintenance 5
- Part 4 commissioning and test run 5
- Part 5 maintenance 5
- Part 6 appendix 5
- Plan setting 5
- Appendix b 6
- Introduction 7
- Part 0 7
- What is in this chapter 7
- About this manual 8
- Characteristics 9
- Safety measures 10
- Installation 11
- Standard accessories furnished on basic unit 14
- Options on request 15
- Introduction esie 07 05 16
- Machine type era air cooled condensing unit eww water cooled packaged water chiller ewl remote condenser water chiller ewa air cooled chiller cooling only ewy air cooled chiller heatpump ewc air cooled chiller cooling only with centrifugal fan ewt air cooled chiller cooling only with heat recovery 16
- Nomenclature 16
- Part 1 system outline 17
- General outline 19
- Part 1 19
- What is in this chapter 19
- 4 part 1 system outline 20
- General outline esie07 05 20
- Technical specifications ewwd cjynn 20
- Technical specifications the table below contains the technical specifications 20
- Esie07 05 general outline 21
- Note 1 nominal cooling capacity and power input are based on 12 7 c entering leaving evaporator water temperature 30 35 c entering leaving condenser water temperature 21
- Part 1 system outline 1 5 21
- 6 part 1 system outline 22
- Absorbed current of compressor n 1 n 2 n 3 at nominal conditions inrush current of last compressor n 4 22
- Absorbed current referred to nominal condition 12 7 c entering leaving evaporator water temperature 30 35 c entering leaving condenser water temperature 22
- Absorbed current referred to the following conditions 14 9 c entering leaving evaporator water temperature 50 55 c entering leaving condenser water temperature 22
- Compressor fla full load ampere 22
- Electrical specifications ewwd cjynn 22
- General outline esie07 05 22
- Note 1 allowed voltage tolerance 10 voltage unbalance between phases must be within 3 2 22
- Operating limits 23
- Fouling and correction factors 24
- Performance factors 25
- Outlook drawing ewwd340 550cjynn 26
- Outlook drawing ewwd700 950cjynn 28
- Outlook drawing ewwdc10 c15cjynn 30
- Outlook drawing ewwdc16 c19cjynn 32
- Part 1 35
- Piping layout 35
- What is in this chapter 35
- 20 part 1 system outline 36
- Functional diagram ewwd cjyynn refrigerant circuit 36
- Functional diagram the illustration below shows the functional diagram of the refrigeration circuit of ewwd cjynn it is also applicable for glycol applications 36
- Piping layout esie07 05 36
- Part 2 functional description 39
- Part 2 41
- The digital controller 41
- What is in this chapter 41
- General description 42
- Main control software features 43
- Component description digital controller 44
- Control panel 45
- Main board 46
- Eexv valve driver 48
- Meaning of the driver eexv status leds 50
- Addressing of plan 51
- Controller input output 52
- Display and keypad 57
- Controller menu s 60
- Cooling 61
- Ent evap xxx c 61
- Gg mm aa 61
- Lvg evap xxx c 61
- Main menu 61
- Staging 61
- Status 61
- Stp source 61
- Water temperatures 61
- Comp 1 62
- Delivsupheat 62
- Lvg rec xxx c 62
- Position 62
- Press barg 62
- Status auto xxx 62
- Suction 62
- Supheat 62
- Water temperatures 62
- User menu 64
- Setting menu 68
- Input output menu i o menu 69
- Bios date 70
- Bios version 70
- Boot date 70
- Boot version 70
- Driver firmware 70
- Version 70
- Xx xx xx 70
- Manufacturer menu 71
- 090 s s 74
- Bar 01 00 bar 74
- Bar 20 05 bar 74
- Delays 74
- Low pressure alarm 74
- Max load setp 74
- Min load setp 74
- Pressure alarm 74
- Pressure ratio alarm 74
- Run delay 74
- S 120 060 s 74
- Setpoint 74
- Startup delay 74
- Transducers high 74
- Transducers low 74
- 020 bar s 75
- 090 s s 75
- 10 c c 75
- Alarm delays 75
- Diff delays 75
- Liquid injection 75
- Oil high pressure 75
- Oil low pressure 75
- Run delay 75
- Setpoint 75
- Startup delay 75
- Maintenance menu 76
- Comp min load 78
- Compressor 78
- Dt to reload and 78
- Max time min 78
- Min evap dt 78
- Reunload comp 78
- Time to download 78
- Buffer n 79
- Choose language 79
- Compressor 1 79
- English 79
- Manual load 79
- Reset alarm 79
- Service menu 79
- State auto 79
- Alarm menu 80
- Buffer alarm menu 81
- 44 part 2 functional description 82
- Alarm list 82
- Alarm table chiller 82
- Introduction the table below shows the list of the possible alarms with the identifier number the cause and the reset type a auto m manual 82
- The digital controller esie07 05 82
- Alarm table driver1 83
- Alarm table driver2 83
- Esie07 05 the digital controller 83
- Part 2 functional description 2 45 83
- Functional control 85
- Part 2 85
- What is in this chapter 85
- On off management 86
- Continuous loading and unloading uses 2 solenoid valves to control the screw compressor slide and thus its capacity control is performed by outlet temperature 87
- Esie07 05 functional control 87
- In the following flow chart the unit startup management and shutdown procedures are shown as well as the compressors loading and unloading strategy 87
- Introduction the thermostat control is used to generate a load up or load down according to the active pid regulation 87
- Part 2 functional description 2 49 87
- Thermostat control 87
- Unit and compressor start up and shutdown procedure 87
- 50 part 2 functional description 88
- Compressors start up and loading management 4 compressors 88
- Functional control esie07 05 88
- Unit shutdown 88
- Unit shutdown request 88
- Compressors unload and shutdown management 4 compressors 89
- Esie07 05 functional control 89
- Part 2 functional description 2 51 89
- 52 part 2 functional description 90
- Dead band 0 c 90
- Functional control esie07 05 90
- Interstage 210 s 90
- Loading and unloading zones the graph below shows the different loading and unloading zones 90
- Max pull down 0 min 90
- Reload t 0 c 90
- Settings do not change 90
- Cooling double 92
- Enable double 92
- Heating double 92
- Setpoint 92
- Setpoint reset of the chilled water 92
- Setpoint y 92
- Chlwt return reset 94
- Max reset 3 c 94
- Return water reset 94
- Start dt 94
- Freeze up control 95
- 58 part 2 functional description 96
- Anti freeze alarm 96
- Evap 1 anti freeze alarm 96
- Evap 2 anti freeze alarm 96
- Function description 96
- Functional control esie07 05 96
- In case the unit has 2 evaporators 96
- Setpoint 96
- Enable soft load 97
- Max stage 97
- Max time 97
- Y enable soft load 97
- Current limit 98
- Current limit set 98
- Demand limit 98
- Max curr 98
- Unit limiting 98
- Unit load limiting 98
- High chlwt start 99
- Max comp stage 99
- Start up with high evaporator water temperature 99
- Delay on switching 100
- Pump control 100
- Pump fan and comp 100
- The main pump off 100
- Time between main 100
- Auto restart after power failure function 101
- Autorestart after 101
- Power failure y n 101
- Liquid injection 102
- Setpoint 102
- Exv pre opening 103
- Exv preopening 103
- Compressor configuration 104
- Numbers of compressors 104
- Numbers of evaporators 1 2 104
- Auto manual 105
- C 1 1st 105
- C 2 2nd 105
- C 3 3rd 105
- C 4 4th 105
- Comp starts 105
- Compressor management 105
- Compressors 105
- Min t between diff 105
- Min t between same 105
- Min time comp off 180 s 105
- Min time comp on 105
- Sequencing 105
- Set compressor stage 105
- 68 part 2 functional description 106
- Function description 106
- Functional control esie07 05 106
- High pressure setback 107
- Lp prevention 108
- Capacity control 109
- Number of pulses 109
- To load comp 109
- To unload comp 109
- 72 part 2 functional description 110
- Compressor loading 110
- Compressor unloading 110
- Fixed variable 110
- Functional control esie07 05 110
- Graph 1 a pure proportional logic will load or unload with a frequency related to the set point distance 110
- Max pulse period 110
- Min pulse period 110
- Pulse time 110
- Pulse time the time of the pulse time is fixed default 0 s the interval time between two pulses is proportional to the pid proportional integral derivative unit request 110
- Esie07 05 functional control 111
- Graph 2 the derivative part of the logic controls how the temperature reaches the setpoint if it is getting closer increases the time between intervals or if it is far from the setpoint decreases the time between intervals the result is having the controller act differently whenever the water temperature changes 111
- If the derivative time is increased the control will be more sensitive to temperature changes for example the derivative time can be increased when a chiller is working with a very variable load the integral time stores the memory on how the p 1 controls the temperature 111
- Part 2 functional description 2 73 111
- Enable 112
- Max time 112
- Min press 112
- Pump down config 112
- Pump down configuration at compressor stop 112
- Pressure alarm 113
- Pressure safeties 113
- Setpoint 113
- Transducer high pressure alarm 113
- Transducers high 113
- Transducer low pressure alarm 114
- Low press alarm delays 115
- Lp alarm delay 115
- Run delay 115
- Start up delay 115
- Max load setp 116
- Min load setp 116
- Oil management safeties 116
- Pressure ratio alarm 116
- High oil dp alarm 117
- Pressure ratio alarm 117
- Pressure ratio alarm delay 117
- Run delay 117
- Setpoint 117
- Start up delay 117
- Part 3 troubleshooting 119
- Part 3 121
- Procedure for software upload download 121
- What is in this chapter 121
- Copy from the software key to pco 122
- Copy from the software key to pco² 122
- Copy from pco to the software key 123
- Copy from pco² to the software key 123
- Installation of winload32 on the pc and programming a controller 124
- Go to the winload32 program page 125
- Select chiller pco² page 125
- Double click on the file 127
- Press on extract 127
- Select winload32 exe 127
- The file winload32 v3 0 is now saved on the hard disk of your pc 127
- Winzip will open 127
- Click on the model name 129
- Click to download the file 129
- Go back to the pco² software download page on the extranet 129
- Select save to download the file to your pc 129
- Please check that you have 4 times 138
- Upload completed successfully 138
- Copy software from winload32 to the software key 139
- Part 3 141
- Plan setting 141
- What is in this chapter 141
- I o board adr 142
- Plan setting 142
- Press enter 142
- Priv shared 142
- Terminal adr 16 142
- Terminal config 142
- To continue 142
- Part 4 commissioning and test run 143
- Part 5 maintenance 145
- Maintenance 147
- Part 5 147
- What is in this chapter 147
- Screw compressors 148
- Standard controls 149
- System maintenance 150
- Preventive maintenance schedule 153
- Refrigerant 154
- Part 6 appendix 155
- Appendix a 157
- Part 6 157
- What is in this chapter 157
- Sound pressure level ewwd cjynn 158
- Sound pressure level correction factor for different distances 159
- Standard ratings ewwd340 800cjynn 160
- Standard ratings ewwd900 c13cjynn 161
- Standars ratings ewwdc14 c19cjynn 162
- Evaporator pressure drop ewwd cjynn 163
- 10 part 5 maintenance 164
- Appendix a esie07 05 164
- Condensor 1 pass heat recovery condenser 1 pass pressure drop ewwd cjynn 164
- Partial heat recovery ratings ewwd340 c19cjynn 165
- Heating capacity correction factors for different evaporator leaving water temperatures 167
- Total heat recovery ratings ewwd340 c10cjynn 168
- Total heat recovery ratings ewwdc11 c19cjynn 170
- Appendix b 173
- Part 6 173
- What is in this chapter 173
- General chiller start up guide 174
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