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Daikin EWAD740C-SS [188/304] Circuit functions
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Functional Control ESIE10-01
2–40 Part 2 – Functional Description
3
1
2
4
5
2.3 Circuit Functions
Overview This chapter contains the following topics:
Topic See page
2.3.1–Circuit Control Logic 2–41
2.3.2–Circuit Status 2–43
2.3.3–Compressor Control 2–44
2.3.4–Condenser Fan Control 2–46
2.3.5–EXV Control 2–48
2.3.6–Economizer Control 2–50
2.3.7–Liquid Injection 2–51
Содержание
- Service manual 1
- General outline 3
- Part 1 system outline 3
- Table of contents 3
- Alarms and events 4
- Controller inputs and outputs 4
- Functional control 4
- Part 2 functional description 4
- Part 3 troubleshooting 4
- The digital controller 4
- Part 4 commissioning and test run 5
- Pre test run checks 5
- Procedure for software programming 5
- Procedure to clear the refrigerant circuit in case of frozen evaporators 5
- Procedure to protect compressor in case of frozen evaporator 5
- Running data 5
- Troubleshooting chart 5
- Maintenance 6
- Part 5 maintenance 6
- Part 1 system outline 7
- General outline 9
- Part 1 9
- What is in this chapter 9
- Features 11
- 8 part 1 system outline 14
- General outline esie10 01 14
- Nomenclature 14
- General characteristics 15
- Esie10 01 general outline 21
- Part 1 system outline 1 15 21
- Technical specifications ewad c ss 21
- Technical specifications the table below contains the technical specifications 21
- 16 part 1 system outline 22
- General outline esie10 01 22
- 18 part 1 system outline 24
- General outline esie10 01 24
- Technical specifications ewad c sl 24
- Technical specifications the table below contains the technical specifications 24
- Esie10 01 general outline 25
- Part 1 system outline 1 19 25
- Esie10 01 general outline 27
- Part 1 system outline 1 21 27
- Technical specifications ewad c sr 27
- Technical specifications the table below contains the technical specifications 27
- 22 part 1 system outline 28
- General outline esie10 01 28
- 24 part 1 system outline 30
- General outline esie10 01 30
- Technical specifications ewad c xs 30
- Technical specifications the table below contains the technical specifications 30
- Esie10 01 general outline 31
- Part 1 system outline 1 25 31
- 26 part 1 system outline 32
- General outline esie10 01 32
- 28 part 1 system outline 34
- General outline esie10 01 34
- Technical specifications ewad c xl 34
- Technical specifications the table below contains the technical specifications 34
- Esie10 01 general outline 35
- Part 1 system outline 1 29 35
- 30 part 1 system outline 36
- General outline esie10 01 36
- 32 part 1 system outline 38
- General outline esie10 01 38
- Technical specifications ewad c xr 38
- Technical specifications the table below contains the technical specifications 38
- Esie10 01 general outline 39
- Part 1 system outline 1 33 39
- 34 part 1 system outline 40
- General outline esie10 01 40
- 36 part 1 system outline 42
- General outline esie10 01 42
- Technical specifications ewad c ps 42
- Technical specifications the table below contains the technical specifications 42
- 2 the values are according to iso 3744 and are referred to evaporator 12 7 c ambient 35 c full load operation 43
- Esie10 01 general outline 43
- Notes 1 cooling capacity unit power input in cooling and eer are based on the following conditions evaporator 12 7 c ambient 35 c unit at full load operation 43
- Part 1 system outline 1 37 43
- 38 part 1 system outline 44
- General outline esie10 01 44
- Technical specifications ewad c pl 44
- Technical specifications the table below contains the technical specifications 44
- 2 the values are according to iso 3744 and are referred to evaporator 12 7 c ambient 35 c full load operation 45
- Esie10 01 general outline 45
- Notes 1 cooling capacity unit power input in cooling and eer are based on the following conditions evaporator 12 7 c ambient 35 c unit at full load operation 45
- Part 1 system outline 1 39 45
- 40 part 1 system outline 46
- General outline esie10 01 46
- Technical specifications ewad c pr 46
- Technical specifications the table below contains the technical specifications 46
- 2 the values are according to iso 3744 and are referred to evaporator 12 7 c ambient 35 c full load operation 47
- Esie10 01 general outline 47
- Notes 1 cooling capacity unit power input in cooling and eer are based on the following conditions evaporator 12 7 c ambient 35 c unit at full load operation 47
- Part 1 system outline 1 41 47
- 42 part 1 system outline 48
- Electrical specifications ewad c ss 48
- Electrical specifications the table below contains the electrical specifications 48
- General outline esie10 01 48
- Electrical specifications ewad c sl 49
- Electrical specifications the table below contains the electrical specifications 49
- Esie10 01 general outline 49
- Part 1 system outline 1 43 49
- 44 part 1 system outline 50
- Electrical specifications ewad c sr 50
- Electrical specifications the table below contains the electrical specifications 50
- General outline esie10 01 50
- Electrical specifications ewad c xs 51
- Electrical specifications the table below contains the electrical specifications 51
- Esie10 01 general outline 51
- Part 1 system outline 1 45 51
- 46 part 1 system outline 52
- General outline esie10 01 52
- Electrical specifications ewad c xl 53
- Electrical specifications the table below contains the electrical specifications 53
- Esie10 01 general outline 53
- Part 1 system outline 1 47 53
- 48 part 1 system outline 54
- General outline esie10 01 54
- Electrical specifications ewad c xr 55
- Electrical specifications the table below contains the electrical specifications 55
- Esie10 01 general outline 55
- Part 1 system outline 1 49 55
- 50 part 1 system outline 56
- General outline esie10 01 56
- Electrical specifications ewad c ps 57
- Electrical specifications the table below contains the electrical specifications 57
- Esie10 01 general outline 57
- Part 1 system outline 1 51 57
- 52 part 1 system outline 58
- Electrical specifications ewad c pl 58
- Electrical specifications the table below contains the electrical specifications 58
- General outline esie10 01 58
- Electrical specifications ewad c pr 59
- Electrical specifications the table below contains the electrical specifications 59
- Esie10 01 general outline 59
- Part 1 system outline 1 53 59
- 54 part 1 system outline 60
- Cooling capacity tables 60
- Ewad c ss ewad c sl 60
- General outline esie10 01 60
- Esie10 01 general outline 61
- Part 1 system outline 1 55 61
- 56 part 1 system outline 62
- General outline esie10 01 62
- C kw evaporator fouling factor 63
- Esie10 01 general outline 63
- Ewad c sr 63
- Notes cc cooling capacity pi unit power input elwt evaporator leaving water temperature δ t 5 c data are referred to 0 0176 63
- Part 1 system outline 1 57 63
- 58 part 1 system outline 64
- General outline esie10 01 64
- Esie10 01 general outline 65
- Part 1 system outline 1 59 65
- 60 part 1 system outline 66
- C kw evaporator fouling factor 66
- Ewad c xs ewad c xl 66
- General outline esie10 01 66
- Notes cc cooling capacity pi unit power input elwt evaporator leaving water temperature δ t 5 c data are referred to 0 0176 66
- Esie10 01 general outline 67
- Part 1 system outline 1 61 67
- 62 part 1 system outline 68
- General outline esie10 01 68
- Esie10 01 general outline 69
- Part 1 system outline 1 63 69
- 64 part 1 system outline 70
- Ewad c xr 70
- General outline esie10 01 70
- Esie10 01 general outline 71
- Part 1 system outline 1 65 71
- 66 part 1 system outline 72
- General outline esie10 01 72
- C kw evaporator fouling factor 73
- Esie10 01 general outline 73
- Notes cc cooling capacity pi unit power input elwt evaporator leaving water temperature δ t 5 c data are referred to 0 0176 73
- Part 1 system outline 1 67 73
- 68 part 1 system outline 74
- Ewad c ps ewad c pl 74
- General outline esie10 01 74
- C kw evaporator fouling factor 75
- Esie10 01 general outline 75
- Notes cc cooling capacity pi unit power input elwt evaporator leaving water temperature δ t 5 c data are referred to 0 0176 75
- Part 1 system outline 1 69 75
- 70 part 1 system outline 76
- Ewad c pr 76
- General outline esie10 01 76
- C kw evaporator fouling factor 77
- Esie10 01 general outline 77
- Notes cc cooling capacity pi unit power input elwt evaporator leaving water temperature δ t 5 c data are referred to 0 0176 77
- Part 1 system outline 1 71 77
- 72 part 1 system outline 78
- Altitude correction factors 78
- Capacity correction factor ewad c 78
- Correction factors for low evaporator leaving water temperature 78
- Evaporator fouling factors 78
- General outline esie10 01 78
- Minimum glycol percentage for low air temperature 78
- Minimum glycol percentage for low water temperature 78
- Note 1 minimum glycol percentage to prevent freezing of water circuit at indicated air ambient temperature 78
- Note 2 air ambient temperature do exceed the operating limits of the unit as protection of water circuit may be needed in winter season at non working conditions 78
- Note correction factors have to be applied at working conditions evaporator leaving water temperature 7 c 78
- Note minimum glycol percentage to be used with evaporator leaving water temperature below 4 c to prevent freezing of water circuit 78
- Correction factors for water and glycol mixture 79
- Depending on the type and percentage of glycol filled in the circuit see table minimum glycol percentage for low air temperature on page 1 72 and table correction factors for water and glycol mixture on page 1 73 79
- Esie10 01 general outline 79
- How to use the correction factors proposed in the previous tables 79
- Multiply the cooling capacity the compressor power input by the correction factor of table correction factors for water and glycol mixture on page 1 73 79
- Now multiply the new flow rate and the new evaporator pressure drop by the correction factors of table correction factors for water and glycol mixture on page 1 73 79
- Part 1 system outline 1 73 79
- Starting from this new value of cooling capacity calculate the flow rate l s and the evapo rator pressure drop kpa 79
- 74 part 1 system outline 80
- Depending from the evaporator leaving water temperature see table correction factors for low evaporator leaving water temperature on page 1 72 80
- Depending on the type and percentage of glycol filled in the circuit see table minimum glycol percentage for low water temperature on page 1 72 and table minimum glycol per centage for low air temperature on page 1 72 and table correction factors for water and gly col mixture on page 1 73 80
- General outline esie10 01 80
- Mixture water and glycol evaporator leaving water temperature 4 c 80
- Multiply the cooling capacity the compressor power input by the correction factor of table correction factors for low evaporator leaving water temperature on page 1 72 and table correction factors for water and glycol mixture on page 1 73 80
- Now multiply the new flow rate and the new evaporator pressure drop by the correction factors of table correction factors for water and glycol mixture on page 1 73 80
- Starting from this new value of cooling capacity calculate the flow rate l s and the evapo rator pressure drop kpa 80
- Available fan static pressure correction factors 81
- Ciat condenser inlet air temperature 81
- Esie10 01 general outline 81
- How to use the correction factors proposed in the previous tables 81
- Part 1 system outline 1 75 81
- 76 part 1 system outline 82
- General outline esie10 01 82
- Water charge flow and quality 82
- Water content in cooling circuits 84
- Esie10 01 general outline 85
- Heat recovery ratings 85
- Notes when using mixture of water and glycol please contact the factory as above specification can change 85
- Part 1 system outline 1 79 85
- Water pump kit combination matrix 85
- Water pump kit technical information 85
- 80 part 1 system outline 86
- Evaporator pressure drops 86
- Ewad c sr 86
- Ewad c ss ewad c sl 86
- Ewad c xr 86
- Ewad c xs ewad c xl 86
- General outline esie10 01 86
- Water flow and pressure drop referred to nominal condition evaporator water in out 12 7 c condenser air inlet 35 c 86
- Condenser air inlet 35 c 87
- Condenser air inlet 46 c 87
- Esie10 01 general outline 87
- Evaporator water in out 11 6 c 87
- Evaporator water in out 12 7 c 87
- Ewad c pr 87
- Ewad c ps ewad c pl 87
- How to use the formula example 87
- Part 1 system outline 1 81 87
- Pressure drop at nominal condition kpa 87
- Pressure drop to be determinate kpa 87
- The cooling capacity at these working conditions is 536 kw 87
- The cooling capacity at these working conditions is 647 kw 87
- The pressure drop at these working conditions is 73 kpa 87
- The unit ewad650c ss at nominal working conditions has the following data 87
- The unit ewad650c ss has been selected for working at the following conditions 87
- The water flow at these working conditions is 25 1 l s 87
- The water flow at these working conditions is 30 0 l s 87
- To determinate the pressure drop for different versions or at different working conditions please refer to the following formula 87
- Water flow and pressure drop referred to nominal condition evaporator water in out 12 7 c condenser air inlet 35 c 87
- Water flow at new working condition l s 87
- Water flow at nominal condition l s 87
- Condensor pressure drops 89
- Operation range 90
- Mechanical installation 91
- Lifting the unit 92
- 90 part 1 system outline 96
- Dimensional drawing 96
- Dimensions ewad c 2 circuits 96
- General outline esie10 01 96
- Notes 1 condenser coil 2 water heat exchanger evaporator 3 evaporator water inlet 4 evaporator water outlet 5 victaulic connection 6 operating and control panel 7 slot for power and control connection 8 fan 9 compressor 96
- Dimensions ewad c 3 circuits 97
- Esie10 01 general outline 97
- Notes 1 condenser coil 2 water heat exchanger evaporator 3 evaporator water inlet 4 evaporator water outlet 5 victaulic connection 6 operating and control panel 7 slot for power and control connection 8 fan 9 compressor 97
- Part 1 system outline 1 91 97
- Electrical installation 98
- Operation 101
- 96 part 1 system outline 102
- General outline esie10 01 102
- Legend 102
- Description of the refrigeration cycle with partial heat recovery 103
- Esie10 01 general outline 103
- Note water inlet and outlet are indicative please refer to the machine dimensional diagrams for exact water connection of the partial recovery exchangers 103
- Once it has reached the superheated vapour state the refrigerant leaves the evaporator and is once again taken into the compressor to repeat the cycle 103
- Part 1 system outline 1 97 103
- The condensed fluid at saturation temperature passes through the subcooling section where it loses even more heat increasing cycle efficiency 103
- The high pressure oil refrigerant mix is drawn into the high efficiency oil separator that separates it the oil depositing on the bottom of the separator through pressure difference is sent back to the compressor while the refrigerant that has been separate from the oil is sent to the partial recovery exchanger where it dissipates the heat from post overheating cooling warming the water which travels through the exchanger on leaving the exchanger the refrigerant fluid enters the condensation bank where by forced ventilation it is condensed 103
- The low temperature refrigerant gas from the evaporator is drawn by the compressor through the electric motor cooling it it is subsequently compressed and during this process the refrigerant mixes with the oil from the oil separator 103
- The result at this point is a low pressure and low temperature liquid gas mixture entering the evaporator 103
- The subcooled fluid then passes through the high efficiency filter dryer it subsequently passes through the lamination element which by means of a pressure drop starts the evaporation process 103
- When the refrigerant liquid vapour is uniformly distributed in the direct expansion evaporator tubes heat is exchanged with the cooling water thus reducing the temperature changing state until complete evaporation followed by superheating 103
- 2 way discharge valve 105
- Compressor 105
- Condenser coil 105
- Esie10 01 general outline 105
- High pressure safety valve 105
- High pressure transducer 105
- Legend 105
- No name 105
- Part 1 system outline 1 99 105
- Schrader valve 105
- 100 part 1 system outline 106
- Compressor the single screw compressor is of the semi hermetic type with an asynchronous three phase two pole motor directly splined on the main shaft the suction gas from the evaporator cools the electric motor before entering the suction ports there are temperature sensors inside the electric motor which are completely covered by the coil winding and constantly monitor motor temperature should the coil winding temperature become very high 120 c a special external device connected to the sensors and to the electronic controller will deactivate the corresponding compressor there are only three moving rotating parts and there are no other parts in the compressor with an eccentric and or alternating movement the basic components are therefore only the main rotor and the two satellites that carry out the compression process meshing perfectly together the f3b and f4a compressors are fitted with two satellites arranged horizontally to the screw compression sealing is obtained thanks to a su 106
- General outline esie10 01 106
- Note water inlet and outlet are indicative please refer to the machine dimensional diagrams for exact water connection of the partial recovery exchangers 106
- 102 part 1 system outline 108
- General outline esie10 01 108
- Modulating box 108
- Modulating box the operating diagram of the modulating box is shown in the following figure the system is controlled by three solenoids a b c which are normally closed if not powered and by a spring assembled directly onto the slide during loading solenoid c is closed because it is not excited whilst the remaining a and b are energised with this configuration the gas from the supply pressure runs through to the chamber on the right of the slide where the pressure wins over the spring resistance whilst the pipe passing by the open solenoid b allows the oil to drain towards suction in the drain phase on the other hand solenoids a and b are de excited and therefore closed whilst solenoid c is opened in this way the oil flow to the delivery pressure runs towards the chamber to the left of the slide moving it towards the left helped by the spring action at the same time the gasses contained on the right hand side of the slide discharge in suction through the free vent pipes 108
- Non modulating box 108
- Non modulating on off box the non modulating slide operating diagram is shown in the following figure the slide is only controlled by means of the opening and closing of two solenoids that always operate by opposition during the load stage the solenoid bringing the slide chamber into communication with the suction is opened thereby helping pressurised oil drain towards the suction moving the slide to the load position up to maximum extension on the contrary if closed at the same time as the second slide opens it allows the pressurised oil flowing from the delivery to move the slide to the discharge position until maximum extension 108
- Wiring diagrams ewad cjynn 109
- Power compressor 1 2 111
- Power compressor 3 112
- Kit pumps 113
- Circuit fan power supply 1 114
- Circuit fan power supply 1 115
- Circuit fan power supply 2 116
- Circuit fan power supply 2 117
- Circuit fan power supply 3 118
- Circuit fan power supply 3 119
- Unit control circuit power supply 120
- Analog inputs output board 121
- Digital inputs board 122
- Digital outputs board 123
- Digital outputs board 124
- Extension control fans 1 2 125
- Extension control fans 3 126
- Extension control fans 4 127
- Expansion input output unit alarm limiting 128
- Expansion control compressor 1 129
- Expansion control compressor 1 130
- Eexv compressor 1 131
- Expansion control compressor 2 132
- Expansion control compressor 2 133
- Eexv compressor 2 134
- Expansion control compressor 3 135
- Expansion control compressor 3 136
- Eexv compressor 3 137
- Pumps control 138
- Terminals m1 m2 139
- Terminals m3 140
- Terminals m5 mq 141
- 136 part 1 system outline 142
- General outline esie10 01 142
- Legend 142
- Esie10 01 general outline 143
- Part 1 system outline 1 137 143
- 138 part 1 system outline 144
- General outline esie10 01 144
- Esie10 01 general outline 145
- Part 1 system outline 1 139 145
- 140 part 1 system outline 146
- General outline esie10 01 146
- Esie10 01 general outline 147
- Field wiring connection 147
- Part 1 system outline 1 141 147
- Part 2 functional description 149
- Part 2 151
- The digital controller 151
- What is in this chapter 151
- 4 part 2 functional description 152
- All modules are connected with a bus system throughout the unit 152
- Bms interface as selected 152
- I o extensions as needed depending on the configuration of the unit 152
- One microtech iii main controller 152
- System architecture 152
- The digital controller esie10 01 152
- The overall controls architecture shall use the following 152
- Configuration of chiller 153
- Esie10 01 the digital controller 153
- Part 2 functional description 2 5 153
- Customer interfaces 154
- Control panel 155
- Addresses used in system 156
- Communication modules 157
- Display and keypad 158
- Date time schedule 159
- General description 159
- Set up 159
- Status settings 159
- Temperature 159
- View set unit 3 b 159
- 12 part 2 functional description 160
- Note parameters with an are available without entering a password 160
- The digital controller esie10 01 160
- Esie10 01 the digital controller 161
- Part 2 functional description 2 13 161
- 14 part 2 functional description 162
- The digital controller esie10 01 162
- Esie10 01 the digital controller 163
- Part 2 functional description 2 15 163
- Set point 164
- Functional control 171
- Part 2 171
- What is in this chapter 171
- Unit functions 172
- Unit enable 173
- Unit mode selection 174
- Unit control states 175
- Unit status 176
- Comp status 177
- Ice mode start delay 177
- Restart possible 177
- Timer status 177
- Evaporator pump control 178
- Noise reduction 179
- Lwt target 180
- 20 ma reset cool mode 181
- Active lwt f 181
- Reset signal ma 181
- 34 part 2 functional description 182
- Active lwt f 182
- Functional control esie10 01 182
- Oat reset 182
- Unit capacity control 183
- Unit capacity overrides 186
- Circuit functions 188
- Circuit control logic 189
- Circuit status 191
- Compressor control 192
- Condenser fan control 194
- Exv control 196
- Compressor capacity 198
- Economizer 198
- Economizer control 198
- Del temp oil temp 199
- Liquid injection 199
- Part 3 troubleshooting 201
- Alarms and events 203
- Part 3 203
- What is in this chapter 203
- Unit stop alarms 204
- Phase volts loss gfp fault 205
- Evaporator flow loss 206
- Action taken rapid stop all circuits 207
- Alarm description as shown on screen evap water freeze 207
- Esie10 01 alarms and events 207
- Evaporator water freeze protect 207
- Outlet temp 207
- Part 3 troubleshooting 3 7 207
- Reset this alarm can be cleared manually via the keypad or via the bms clear alarm signal but only if the alarm trigger conditions no longer exist 207
- Trigger evaporator lwt or ewt drops below evaporator freeze protect set point if the sensor fault is active for either lwt or ewt then that sensor value cannot trigger the alarm 207
- Evaporator water temperatures inverted 208
- Leaving evaporator water temperature sensor fault 209
- Ac comm failure 210
- Outdoor air temperature sensor fault 211
- External alarm 212
- Emergency stop alarm 213
- Unit events 214
- Entering evaporator water temperature sensor fault 215
- External event 216
- Ambient 217
- Low ambient lockout 217
- Circuit stop alarms 218
- Phase volts loss gfp fault 219
- Low evaporator pressure 220
- Low pressure start fail 221
- Mechanical low pressure switch 222
- High condenser pressure 223
- Low pressure ratio 224
- Pressure ratio 224
- Mechanical high pressure switch 225
- High discharge temperature 226
- High oil pressure difference 227
- Compressor starter fault 228
- High motor temperature 229
- Low oat restart fault 230
- No pressure change after start 231
- No pressure at startup 232
- Cc comm failure n 233
- Fc comm failure circuit 1 2 234
- Fc comm failure circuit 3 235
- Fc comm failure circuit 4 236
- Fc comm failure circuit 3 4 237
- Eexv comm failure n 238
- Evaporator pressure sensor fault 239
- Condenser pressure sensor fault 240
- Oil pressure sensor fault 241
- Suction temperature sensor fault 242
- Discharge temperature sensor fault 243
- Motor temperature sensor fault 244
- Circuit events 245
- Low evaporator pressure hold 246
- Low evaporator pressure unload 247
- Lp bar 247
- High condenser pressure hold 248
- High condenser pressure unload 249
- Hp bar 249
- Failed pumpdown 250
- Power loss while running 251
- Alarm logging 252
- Event logging 253
- Controller inputs and outputs 255
- Part 3 255
- What is in this chapter 255
- Main board controller pol687 0 mcq 256
- Expansion i o compressor 1 to 4 pol965 0 mcq 258
- Expansion i o exv circuit 1 to 4 pol94u 0 mcq 260
- Expansion i o fan module circuit 1 2 pol945 0 mcq 261
- Expansion i o fan module circuit 3 pol945 0 mcq 262
- Expansion i o fan module circuit 4 pol945 0 mcq 263
- Expansion i o fan module circuit 3 4 pol945 0 mcq 264
- Expansion i o unit alarm limiting pol965 0 mcq 265
- Part 3 267
- Procedure for software programming 267
- What is in this chapter 267
- Software programming with sd card 268
- Part 3 271
- Procedure to protect compressor in case of frozen evaporator 271
- What is in this chapter 271
- Procedure to protect compressor in case of frozen evaporator 272
- Part 3 273
- Procedure to clear the refrigerant circuit in case of frozen evaporators 273
- What is in this chapter 273
- Procedure to clean the refrigerant circuit in case of frozen evaporators 274
- Part 3 275
- Troubleshooting chart 275
- What is in this chapter 275
- Troubleshooting chart 276
- Part 4 commissioning and test run 279
- Part 4 281
- Pre test run checks 281
- What is in this chapter 281
- Pre start commissioning check list 282
- General checks 283
- Water piping checks 284
- Part 4 287
- Running data 287
- What is in this chapter 287
- Typical operating data 288
- Part 5 maintenance 291
- Maintenance 293
- Part 5 293
- What is in this chapter 293
- System maintenance 294
- Esie10 01 maintenance 299
- If the machine has lost refrigerant it is necessary to first establish the causes before carrying out any replenishment operation the leak must be found and repaired oil stains are a good indica tor as they can appear in the vicinity of a leak however this is not necessarily always a good search criterion searching with soap and water can be a good method for medium to large leaks while an electronic leak detector is required to find small leaks 2 add refrigerant to the system through the service valve on the evaporator inlet pipe 3 the refrigerant can be added under any load condition between 25 and 100 of the circuit suc tion superheating must be between 4 and 6 c 4 add enough refrigerant to fill the liquid sight glass entirely so that no flow of bubbles can be seen any more add an extra 2 3 kg of refrigerant as a reserve to fill the subcooler if the compressor is operating at 50 100 load 5 check the subcooling value by reading the liquid pressure and the liquid temperature near the 299
- If the refrigerant level is slightly low the flow of bubbles can be seen through the liquid sight glass replenish the circuit as described in the replenishment procedure 2 if the gas level in the machine is moderately low the corresponding circuit could have some low pressure stops replenish the corresponding circuit as described in the replenishment proce dure 299
- N b as the load changes and the number of active fans changes subcooling also changes and takes a few minutes to stabilise in any case it must never go below 3 c in any condition furthermore the subcooling value may change slightly as the water temperature and suction superheating vary 299
- One of the two following scenarios can arise in a machine without refrigerant 299
- Part 5 maintenance 5 9 299
- Refrigerant replenishment procedure 299
- Standard checks 300
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