Daikin FTXG25EV1BS Service Manual Page 250
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Check SiEBE12-625
240 Service Diagnosis
6.1.3 Electronic Expansion Valve Check
Check No.04 Conduct the followings to check the electronic expansion valve (EV).
1. Check to see if the EV connector is correctly inserted in the PCB. Compare the EV unit and
the connector number.
2. Turn the power off and back on again, and check to see if all the EVs generate latching
sound.
3. If any of the EVs does not generate latching noise in the above step 2, disconnect that
connector and check the conductivity using a tester.
Check the conductivity between pins 1, 3 and 6, and between pins 2, 4 and 5. If there is no
conductivity between the pins, the EV coil is faulty.
4. If no EV generates latching sound in the above step 2, the outdoor unit PCB is faulty.
5. If the conductivity is confirmed in the above step 2, mount a good coil (which generated
latching sound) in the EV unit that did not generate latching sound, and check to see if that
EV generates latching sound.
∗If latching sound is generated, the outdoor unit PCB is faulty.
∗If latching sound is not generated, the EV unit is faulty.
Note: Please note that the latching sound varies depending on the valve type.
Valve Body Condition (Symptom) Check Method / Measure
(1) Valve body catches at fully opened or half
opened position.
(Symptom)
Cooling:
Water leakage at the no-operation unit
Flow noise of refrigerant in the no-operation unit
Operation halt due to icing protection
Heating:
The unit does not heat
Refrigerant flow rate vary by unit
(Discharge air temperatures are different by
room)
Peak cut
Reset power supply and conduct cooling
operation unit by unit.
(2) Valve body catches at complete close
position.
(Symptom)
Cooling:
The only unit having problem does not cool the
room .
When the only faulty unit is in operation, the unit
makes pump down.
(The low pressure of the unit becomes vacuum)
IT is activated.
Abnormal discharge pipe temperature
Heating:
Insufficient gas due to liquid refrigerant
stagnation inside
the faulty indoor unit
(Only for heat pump model)
The unit does not heat the room.
IT is activated.
Abnormal discharge pipe temperature
Reset power supply and conduct cooling
operation unit by unit.
(3) Valve does not open fully.
(Symptom)
The unit does not cool nor heat (only for heat
pump model.)
IT is actuated.
Abnormal discharge pipe temperature
Check the number of rotation of shaft if it is 5 and
half from full open to complete close using
manual coil for electronic expansion valve. When
the number of rotation of shaft is less than the
above value, the valve may catch anywhere of
the body.
Check the liquid pipe temperature
of no-operation unit.
Is it
almost same as the
outside air
temperature?
(R1431)
Replace the EVn of the room.
NO
YES
Check the low pressure
Does the
pressure become into vacuum
zone?
(R1432)
Replace the EVn of the room
NO
NO
YES
- Ser vice 1
- SUPER MULTI NX 2
- D-Series / E-Series 2
- Table of Contents iii 4
- Table of Contents v 6
- 1. Introduction 7
- 1.1.3 Inspection after Repair 9
- 1.1.4 Using Icons 10
- 1.1.5 Using Icons List 10
- List of Functions 11
- 1. List of Functions 12
- SiEBE12-625 List of Functions 13
- List of Functions 3 13
- List of Functions SiEBE12-625 14
- 4 List of Functions 14
- List of Functions 5 15
- 6 List of Functions 16
- 1.2 Heat Pump Models 17
- 8 List of Functions 18
- List of Functions 9 19
- 10 List of Functions 20
- List of Functions 11 21
- 12 List of Functions 22
- Specifications 23
- 1. Specifications 24
- SiEBE12-625 Specifications 25
- Specifications 15 25
- Specifications SiEBE12-625 26
- 16 Specifications 26
- Specifications 17 27
- 18 Specifications 28
- Duct Connected Type 28
- Specifications 19 29
- 20 Specifications 30
- Specifications 21 31
- Floor Standing Type 31
- 22 Specifications 32
- 1.3 Indoor Units - Heat Pump 33
- 24 Specifications 34
- Specifications 25 35
- 26 Specifications 36
- Specifications 27 37
- 28 Specifications 38
- Specifications 29 39
- 30 Specifications 40
- Specifications 31 41
- 32 Specifications 42
- Floor Standing Type 50Hz 230V 42
- 1.4 Outdoor Units - Heat Pump 43
- 34 Specifications 44
- Printed Circuit Board 45
- Connector Wiring Diagram 45
- 1.1 Wall Mounted Type 46
- PCB(1): Control PCB 47
- 1.1.2 FTK(X)S20~35C 48
- PCB(2): Signal Receiver PCB 50
- Connectors 51
- 1.1.4 FTXG25~35E, CTXG50E 53
- 1.2 Duct Connected Type 55
- PCB (2): Display PCB 56
- PCB (2): Power Supply PCB 58
- PCB (3): Display PCB 58
- PCB (4): Signal Receiver PCB 58
- 1.4 Floor Standing Type 59
- (25, 35 class) 60
- PCB (2): Control PCB 61
- 1.5 Outdoor Units 62
- PCB Detail 63
- Inverter PCB (MID2) 64
- Function and Control 65
- 1. Main Functions 66
- Forced Cooling / 67
- Heating Operation 67
- Auto-Swing 68
- FTK(X)S20-50D 69
- FTXG25-35E, CTXG50E 70
- Control Flow 70
- Timing Chart 70
- 1.5 Programme Dry Function 72
- 1.6 Automatic Operation 73
- 1.7 Thermostat Control 74
- 1.8 Night Set Mode 75
- 1.9 ECONO Mode 76
- SiEBE12-625 Main Functions 77
- Function and Control 67 77
- Main Functions SiEBE12-625 78
- 68 Function and Control 78
- Scene <cooling> 79
- Scene <Heating> 79
- Details of the 80
- ON/OFF button 81
- 72 Function and Control 82
- 2.1 Main Structural Parts 83
- 2.2 Function of Thermistor 84
- D Indoor Heat 85
- Exchanger 85
- E Liquid Pipe 85
- 2.2.2 Cooling Only Model 86
- 3. Control Specification 88
- 3.2 Frequency Control 89
- Frequency 91
- 3.4 Discharge Pipe Control 92
- 3.5 Input Current Control 92
- 3.7 Heating Peak-cut Control 93
- 3.8 Fan Control 94
- 3.10 Defrost Control 95
- Outline Heat Pump Only 96
- Detail Separate into Zones 96
- Function and Control 87 97
- 3.12.10 Oil Recovery Function 99
- 3.13 Malfunctions 100
- 3.14 Forced Operation Mode 101
- 3.15 Wiring-Error Check 102
- Function and Control 93 103
- When Inverter 104
- HEAT mode (H) 105
- 5<C>3<H>1 105
- COOL mode (C) 105
- 96 Function and Control 106
- System Configuration 107
- 1. System Configuration 108
- Instruction 109
- 2.2 Safety Precautions 110
- Installation site 111
- Electrical work 111
- System relocation 111
- Names of Parts 112
- Outdoor Unit 113
- Remote control 114
- FTK(X)S 20/25/35 C 115
- Indoor Unit 115
- Oudoor Unit 116
- CDK(X)S 50/60/71 E 118
- Main unit control panel 118
- FLK(X)S 71 B 121
- FTXG 25/35 E, CTXG 50 E 124
- How to open the front panel 130
- FVK(X)S 25/35/50 B 133
- Preparation before Operation 136
- Receiver 137
- To remove, pull it upwards 137
- To set the clock 138
- Turn the breaker ON 138
- SiEBE12-625 Instruction 139
- List of Functions 129 139
- Instruction SiEBE12-625 140
- 130 List of Functions 140
- FTK(X)E 20/25/35/50 D 141
- In DRY mode or COOL mode 142
- In HEAT mode 142
- In FAN mode 142
- In HEAT or FAN mode 144
- FLK(X) 25/35/50/60 A 145
- List of Functions 137 147
- In COOL or DRY mode 148
- In COMFORT AIRFLOW mode 148
- FTXS 25/35/50/60 B 149
- 140 List of Functions 150
- COOL/DRY 151
- Air flow selection 152
- POWERFUL Operation 153
- OUTDOOR UNIT SILENT Operation 154
- ECONO Operation 155
- HOME LEAVE Operation 156
- Useful in these cases 157
- INTELLIGENT EYE Operation 158
- Notes on “INTELLIGENT EYE” 159
- 150 List of Functions 160
- 152 List of Functions 162
- • 20 min. after, start 164
- TIMER Operation 166
- (Example) 167
- 158 List of Functions 168
- Priority Room Setting 169
- Care and Cleaning 170
- Fit the key 170
- List of Functions 161 171
- Before a long idle period 172
- Air purifying filter 174
- Air filter 174
- 166 List of Functions 176
- List of Functions 167 177
- List of Functions 169 179
- 170 List of Functions 180
- 172 List of Functions 182
- List of Functions 173 183
- FDK(X)S 25/35 C 184
- Cleaning the air filter 185
- 176 List of Functions 186
- 178 List of Functions 188
- List of Functions 179 189
- Place front panel in grooves 192
- Troubleshooting 195
- Check again 196
- Case Check 196
- Disposal requirements 197
- Fault diagnosis 198
- Diagnosis marked 199
- 190 List of Functions 200
- Service Diagnosis 201
- 1. Caution for Diagnosis 202
- Service Diagnosis 193 203
- 3. Service Check Function 205
- → See 7.) 206
- → Refer to page 198.) 207
- 5. Troubleshooting 209
- 5.2 Outdoor Units 210
- Troubleshooting SiEBE12-625 212
- 202 Service Diagnosis 212
- 5.5.1 AC Motor 214
- 5.5.2 DC Motor 215
- SiEBE12-625 Troubleshooting 217
- Service Diagnosis 207 217
- 208 Service Diagnosis 218
- Service Diagnosis 209 219
- 210 Service Diagnosis 220
- Service Diagnosis 211 221
- 5 1 4 2 1 3 4 4 4 222
- 5 1 4 2 1 3 4 4 1 224
- 5.13 Compressor Lock 225
- 5.14 DC Fan Lock 226
- 5 1 1 2 4 3 1 4 4 227
- 5 1 4 2 1 3 1 4 1 229
- 5 1 4 2 4 3 1 4 1 234
- P4, J3, J6, J8, J9, H9 237
- 5 1 4 2 4 3 1 4 4 239
- 5 1 1 2 1 3 1 4 4 241
- 5 1 1 2 1 3 4 4 1 243
- 5.25 Insufficient Gas 245
- 5.26 Low-voltage Detection 247
- 5 1 1 2 1 3 1 4 1 248
- 6. Check 249
- Check No.05 251
- Resistance range 252
- Check No.07 253
- Check No.08 254
- Check No.09 254
- Check No.11 255
- 6.1.12 Power Transistor Check 256
- SiEBE12-625 Check 257
- Service Diagnosis 247 257
- 6.1.15 Hall IC Check 258
- Removal Procedure 259
- Outdoor air 260
- Piping connection slot 260
- Washer-fitted nut M8 263
- 1.3 Removal of Electrical Box 264
- Glass tube fuse (Soldered) 265
- Varister 265
- Relay connector 268
- Electrical box cover 268
- Thermistor presser spring 269
- Discharge pipe 269
- Electrical box 270
- Base bar 271
- 262 Removal Procedure 272
- Procedure Points 272
- Partition board 277
- Sound blanket 277
- 1.8 Removal of Shunt 279
- 1.10 Removal of Compressor 282
- Top panel 284
- Discharge outlet grill 284
- Front panel 284
- Piping cover 284
- 2.2 Removal of Electrical BOX 285
- Wiring fixture 287
- Drip-proof cover 288
- H1 (yellow) 290
- H2 (blue) 290
- ECN1 (green) 290
- Washer-fitted nut 292
- 2.5 Removal of Sound Blanket 293
- Thermistor 295
- Brazed part 297
- 2.9 Removal of Compressor 298
- SiEBE12-625 299
- Others 289 299
- 1. Others 300
- (R4417) (R4418) 301
- Others SiEBE12-625 302
- 292 Others 302
- Appendix 303
- 1. Piping Diagrams 304
- FTKS50D2V1W(L) FTXS50D2V1W(L) 305
- CTXG50EV1BW(S) 306
- 1.1.2 Duct Connected Type 307
- 1.1.4 Floor Standing Type 308
- FVKS50BAVMB FVXS50BAVMB 309
- 1.2 Outdoor Units 310
- 1.2.2 Heat Pump 311
- 2. Wiring Diagrams 312
- FTK(X)S50D2V1W(L) 313
- 2.1.2 Duct Connected Type 314
- 2.1.4 Floor Standing Type 315
- 2.2 Outdoor Units 316
- Index iii 319
- Drawings & Flow Charts 321
- SiEBE12-625 • 01/2007 323
- Prepared in Belgium by Lannoo 323
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