Panasonic U-4..6ML5XPQ, Service Manual

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ii Table of Contents
3.5 Restart Standby......................................................................................58
3.6 Stopping Operation ................................................................................59
4. Protection Control .................................................................................60
4.1 High Pressure Protection Control...........................................................60
4.2 Low Pressure Protection Control............................................................61
4.3 Discharge Pipe Protection Control .........................................................62
4.4 Inverter Protection Control .....................................................................63
5. Other Control.........................................................................................64
5.1 Demand Operation .................................................................................64
5.2 Heating Operation Prohibition ................................................................64
6. Outline of Control (Indoor Unit) .............................................................65
6.1 Drain Pump Control................................................................................65
6.2 Louver Control for Preventing Ceiling Dirt..............................................67
6.3 Thermostat Sensor in Remote Controller...............................................68
6.4 Freeze Prevention ..................................................................................70
6.5 View of Operations of Swing Flaps ........................................................71
6.6 Electronic Expansion Valve Control .......................................................72
6.7 Hot Start Control (In Heating Operation Only)........................................72
Part 6 Test Operation .................................................................73
1. Test Operation ......................................................................................74
1.1 Procedure and Outline ...........................................................................74
1.2 Operation when Power is Turned On .....................................................85
2. Outdoor Unit PC Board Layout .............................................................86
3. Field Setting ..........................................................................................87
3.1 Field Setting from Remote Controller .....................................................87
3.2 Field Setting from Outdoor Unit............................................................104
Part 7 Troubleshooting ............................................................. 123
1. Symptom-based Troubleshooting .......................................................125
2. Troubleshooting by Remote Controller ...............................................128
2.1 The INSPECTION / TEST Button.........................................................128
2.2 Self-diagnosis by Wired Remote Controller .........................................129
2.3 Self-diagnosis by Wireless Remote Controller .....................................130
2.4 Operation of the Remote Controller’s Inspection /
Test Operation Button ..........................................................................132
2.5 Remote Controller Service Mode .........................................................133
2.6 Remote Controller Self-Diagnosis Function .........................................135
3. Troubleshooting by Indication on the Remote Controller ....................142
3.1 “
A0
” Indoor Unit: Error of External Protection Device............................142
3.2 “
A1
” Indoor Unit: PC Board Defect ........................................................143
3.3 “
A3
” Indoor Unit: Malfunction of Drain Level Control System (S1L) ......144
3.4 “
A6
” Indoor Unit: Fan Motor (M1F) Lock, Overload...............................146
3.5 “
A7
” Indoor Unit: Malfunction of Swing Flap Motor (M1S).....................147
3.6 Abnormal Power Supply Voltage..........................................................149
3.7 “
A9
” Indoor Unit: Malfunction of Moving Part of
Electronic Expansion Valve (Y1E)........................................................150
3.8 “
AF
” Indoor Unit: Drain Level above Limit .............................................152
3.9 “
AJ
” Indoor Unit: Malfunction of Capacity Determination Device ..........153
Urban Multi ML5 · Mini UM · Heat Pump