Daikin VRV IV+ Service Manual page 6

Table of contents
2.4.8 Symptom: White mist comes out of a unit (Indoor
unit, heat exchanger unit) ........................................... 73
2.4.9 Symptom: The user interface display reads "U4" or
"U5" and stops, but then restarts after a few minutes. 73
2.4.10 Symptom: Noise of air conditioners (Indoor unit)........ 73
2.4.11 Symptom: Noise of air conditioners (Indoor unit,
outdoor unit)................................................................ 74
2.4.12 Symptom: Noise of air conditioners (Outdoor unit) ..... 74
2.4.13 Symptom: Dust comes out of the unit ......................... 74
2.4.14 Symptom: The units can give off odours..................... 74
2.4.15 Symptom: The outdoor unit fan does not spin ............ 74
2.4.16 Symptom: The display shows "88".............................. 74
2.4.17 Symptom: The compressor in the outdoor unit does
not stop after a short heating operation ...................... 74
2.4.18 Symptom: The inside of an outdoor unit is warm
even when the unit has stopped ................................. 74
2.4.19 Symptom: Hot air can be felt when the indoor unit is
stopped ....................................................................... 74
2.4.20 Symptom: Unit operation problems............................. 75
2.4.21 Other symptoms.......................................................... 76
3 Components
3.1 4-way valve ............................................................................... 77
3.1.1 Main 4-way valve ........................................................ 77
3.1.2 Sub 4-way valve.......................................................... 80
3.2 Compressor............................................................................... 82
3.2.1 Checking procedures .................................................. 82
3.2.2 Repair procedures ...................................................... 84
3.3 Crankcase heater ...................................................................... 87
3.3.1 Checking procedures .................................................. 87
3.3.2 Repair procedures ...................................................... 87
3.4 Current sensor........................................................................... 88
3.4.1 Checking procedures .................................................. 88
3.4.2 Repair procedures ...................................................... 88
3.5 Expansion valve ........................................................................ 89
3.5.1 Checking procedures .................................................. 89
3.5.2 Repair procedures ...................................................... 90
3.6 Fan inverter PCB....................................................................... 92
3.6.1 Single fan outdoor unit ................................................ 92
3.6.2 Double fan outdoor unit............................................... 95
3.7 High pressure switch ................................................................. 97
3.7.1 Checking procedures .................................................. 97
3.7.2 Repair procedures ...................................................... 98
3.8 Inverter PCB.............................................................................. 99
3.8.1 Checking procedures .................................................. 99
3.8.2 Repair procedures ...................................................... 103
3.9 Main PCB .................................................................................. 106
3.9.1 Checking procedures .................................................. 106
3.9.2 Repair procedures ...................................................... 108
3.10 Noise filter PCB ......................................................................... 110
3.10.1 Checking procedures .................................................. 110
3.10.2 Repair procedures ...................................................... 112
3.11 Oil return valve .......................................................................... 112
3.11.1 Checking procedures .................................................. 112
3.11.2 Repair procedures ...................................................... 114
3.12 Outdoor unit fan motor .............................................................. 115
3.12.1 Single fan outdoor unit ................................................ 115
3.12.2 Double fan outdoor unit............................................... 116
3.13 Plate work.................................................................................. 118
3.13.1 To access the switch box on single fan units.............. 118
3.13.2 To access the switch box on double fan units ............ 119
3.13.3 To remove the plate work on single fan units ............. 119
3.13.4 To remove the plate work on double fan units ............ 121
3.14 Reactor...................................................................................... 123
3.14.1 Checking procedures .................................................. 123
3.14.2 Repair procedures ...................................................... 124
3.15 Refrigerant high pressure sensor .............................................. 124
3.15.1 Checking procedures .................................................. 124
3.15.2 Repair procedures ...................................................... 125
3.16 Refrigerant low pressure sensor ............................................... 126
Service manual
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3.16.1 Checking procedures ...................................................126
3.16.2 Repair procedures .......................................................127
3.17 Thermistors ................................................................................ 128
3.17.1 Refrigerant side thermistors.........................................128
3.17.2 Other thermistors .........................................................130
4 Third party components
4.1 Electrical circuit .......................................................................... 130
4.1.1 Checking procedures ...................................................130
4.1.2 Repair procedures .......................................................133
4.2 Refrigerant circuit ....................................................................... 133
4.2.1 Checking procedures ...................................................133
4.2.2 Repair procedures .......................................................136
4.3 External factors .......................................................................... 138
4.3.1 Checking procedures ...................................................138
4.3.2 Repair procedures .......................................................139
5 Maintenance
5.1 Maintenance shedule ................................................................. 140
5.2 Maintenance procedures for outdoor units................................. 140
5.2.1 To check the general status of the unit ........................140
77
5.2.2 To clean the cover plates.............................................140
5.2.3 To clean the outdoor unit heat exchanger ...................141
5.3 Maintenance procedures for indoor units ................................... 142
5.3.1 To check the general status of the unit ........................142
5.3.2 To clean the cover plates.............................................142
5.3.3 To clean the indoor unit heat exchanger......................142
Direct expansion: Maintenance - VRV....................................... 143
6 Technical data
6.1 Detailed information setting mode.............................................. 145
6.1.1 Detailed information setting mode: Outdoor unit..........145
6.1.2 Detailed information setting mode: Remote controller .145
6.2 Wiring diagram ........................................................................... 146
6.2.1 Wiring diagram: Outdoor unit .......................................146
6.3 Piping diagram ........................................................................... 148
6.3.1 Piping diagram: Outdoor unit .......................................148
6.3.2 Refrigerant flow diagram: Outdoor unit ........................151
6.4 Component overview.................................................................. 164
6.4.1 Component overview: RXYQ8~12U units....................164
6.4.2 Component overview: RXYQ14~16U units..................166
6.4.3 Component overview: RXYQ18~20U units..................168
6.4.4 Component overview: RYMQ8~12U units ...................170
6.4.5 Component overview: RYMQ14~16U units .................172
6.4.6 Component overview: RYMQ18~20U units .................174
6.4.7 Component overview: RYYQ8~12U units....................176
6.4.8 Component overview: RYYQ14~16U units..................178
6.4.9 Component overview: RYYQ18~20U units..................180
6.5 Switchbox overview.................................................................... 182
6.5.1 Single fan units ............................................................182
6.5.2 Double fan units ...........................................................182
6.6 Safety devices ............................................................................ 183
6.7 Field information report .............................................................. 184
6.8 Service tools............................................................................... 187
6.9 Field settings .............................................................................. 188
6.9.1 To access mode 1 or 2 ................................................188
6.9.2 To use mode 1 .............................................................188
6.9.3 To use mode 2 .............................................................188
6.9.4 Mode 1: Field settings..................................................189
6.9.5 Mode 2: Field settings..................................................191
6.9.6 Overview of field settings for indoor units ....................194
6.9.7 Field settings as per type of indoor unit .......................197
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RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 - 2019.07