Mitsubishi Heavy Industries FDT100VNAWVH User manual

(Split system, air to air heat pump type)
DUCT CONNECTED-LOW/MIDDLE STATIC PRESSURE TYPE
Single type
FDUM100VNAWVH
100VSAWVH
125VNAWVH
125VSAWVH
140VNAWVH
140VSAWVH
Twin type
FDUM100VNAWPVH
100VSAWPVH
125VNAWPVH
125VSAWPVH
140VNAWPVH
140VSAWPVH
Triple type
FDUM140VNAWTVH
140VSAWTVH
CEILING CASSETTE-4 WAY COMPACT TYPE
Twin type
FDTC100VNAWPVH
100VSAWPVH
125VNAWPVH
125VSAWPVH
Single type
FDT100VNAWVH
100VSAWVH
125VNAWVH
125VSAWVH
140VNAWVH
140VSAWVH
CEILING CASSETTE-4 WAY TYPE
Twin type
FDT100VNAWPVH
100VSAWPVH
125VNAWPVH
125VSAWPVH
140VNAWPVH
140VSAWPVH
Triple type
FDT140VNAWTVH
140VSAWTVH
Triple type
FDTC140VNAWTVH
140VSAWTVH
MICRO INVERTER PACKAGED AIR-CONDITIONERS
Single type
SRK100VNAWZR
100VSAWZR
WALL MOUNTED TYPE
Twin type
SRK100VNAWPZSX
100VSAWPZSX
125VNAWPZSX
125VSAWPZSX
140VNAWPZR
140VSAWPZR
Triple type
SRK140VNAWTZSX
140VSAWTZSX
DUCT CONNECTED-HIGH STATIC PRESSURE TYPE
Single type
FDU100VNAWVH
100VSAWVH
125VNAWVH
125VSAWVH
140VNAWVH
140VSAWVH
(OUTDOOR UNIT)
FDC100VNA-W
100VSA-W
125VNA-W
125VSA-W
140VNA-W
140VSA-W
(INDOOR UNIT)
FDT50VH
60VH
71VH
FDE50VH
60VH
71VH
V Multi System
Single type
FDE100VNAWVH
100VSAWVH
125VNAWVH
125VSAWVH
140VNAVWH
140VSAVWH
Twin type
FDE100VNAWPVH
100VSAWPVH
125VNAWPVH
125VSAWPVH
140VNAWPVH
140VSAWPVH
CEILING SUSPENDED TYPE
Triple type
FDE140VNAWTVH
140VSAWTVH
Manual No.'19 • PAC-SM-309
SERVICE MANUAL
updated January 27, 2020

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TABLE OF CONTENTS
1. MICRO INVERTER PACKAGED AIR-CONDITIONERS .................................... 2
2. V MULTI SYSTEM............................................................................................... 201

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1. MICRO INVERTER PACKAGED AIR-CONDITIONERS
CONTENTS
1.1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER.................. 5
1.1.1 Remote control ....................................................................................... 5
1.1.2 Operation control function by the wired remote control .................... 10
1.1.3 Operation control function by the indoor control ............................... 13
(Ⅰ) FDT, FDTC, FDU, FDUM, FDE series ....................................................... 13
(1) Auto operation ........................................................................................... 13
(2) Operations of functional items during cooling/heating .............................. 14
(3) Dehumidifying (DRY) operation................................................................. 14
(4) Timer operation ......................................................................................... 15
(5) Hot start (Cold draft prevention at heating) ............................................... 16
(6) Hot keep.................................................................................................... 17
(7) Auto swing control (FDT, FDTC, FDE only)............................................... 17
(8) Thermostat operation ................................................................................ 18
(9) Filter sign................................................................................................... 19
(10) Compressor inching prevention control..................................................... 19
(11) Drain pump control .................................................................................... 20
(12) Drain pump motor (DM) control................................................................. 20
(13) Operation check/drain pump test run operation mode .............................. 20
(14) Cooling, dehumidifying frost protection ..................................................... 21
(15) Heating overload protection ...................................................................... 21
(16) Anomalous fan motor ................................................................................ 21
(17) Plural unit control - Control of 16 units group by one remote control ........ 22
(18) High ceiling control.................................................................................... 22
(19)
Abnormal temperature sensor (retun air/indoor heat exchanger) broken wire/short-circuit detection ..... 23
(20) External input/output control (CnT or CnTA) ............................................. 23
(21) Operation permission/prohibition............................................................... 25
(22) Temporary stop input................................................................................. 27
(23) Selection of cooling/heating external input function .................................. 27
(24) Fan control at heating startup.................................................................... 28
(25)
Room temperature detection temperature compensation during heating ....... 28
(26) Return air temperature compensation....................................................... 28
(27) High power operation (RC-EX3A only)...................................................... 28
(28) Energy-saving operation (RC-EX3A only)................................................. 28
(29) Warm-up control (RC-EX3A only) ............................................................. 28
(30) Home leave mode (RC-EX3A only)........................................................... 28
(31) Auto temperature setting (RC-EX3A only)................................................. 28
(32) Fan circulator operation (RC-EX3A only) .................................................. 29
(33) The operation judgment is executed every 5 minutes (RC-EX3A only) .... 29

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(34) Auto fan speed control (RC-EX3A only) .................................................... 29
(35) Indoor unit overload alarm (RC-EX3A only) .............................................. 29
(36) Peak-cut timer (RC-EX3A only)................................................................. 29
(37) Motion sensor control (RC-EX3A only)...................................................... 30
(Ⅱ) SRK Seris .................................................................................................. 32
(1) Unit ON/OFF button .................................................................................. 32
(2) Auto restart function .................................................................................. 32
(3) Auto swing control ..................................................................................... 33
(4) Timer operation ......................................................................................... 34
(5) Outline of heating or cooling operation...................................................... 35
(6) Indoor fan motor protection ....................................................................... 35
(7) Serial signal transmission error protection ................................................ 35
(8) Plural unit control - Control of 16 units group by one remote control ........ 35
(9) Filter sign................................................................................................... 36
(10) Outline of automatic operation .................................................................. 36
(11) Frost prevention control............................................................................. 38
(12) Dew prevention control ............................................................................. 38
(13) Outline of dehumidifying (DRY) operation................................................. 40
1.1.4 Operation control function by the outdoor control............................ 41
(1) Determination of comressor speed (Frequency)....................................... 41
(2) Compressor start control........................................................................... 41
(3) Compressor soft start control .................................................................... 42
(4) Outdoor fan control.................................................................................... 43
(5) Defrost operation....................................................................................... 44
(6)
Protective control/anomalous stop control by compressor,s number of revolutions ..... 45
(7) Silent mode ............................................................................................... 48
(8) Test run...................................................................................................... 48
(9) Pump-down control ................................................................................... 49
1.2 MAINTENANCE DATA................................................................................... 50
1.2.1 Diagnosing of microcomputer circuit.................................................. 50
(1) Selfdiagnosis function ................................................................................. 50
(2) Troubleshooting procedure.......................................................................... 55
(3) Troubleshooting at the indoor unit............................................................... 55
(4) Troubleshooting at the outdoor unit............................................................. 67
(5) Check of anomalous operation data with the remote control ...................... 77
(6) Inverter checker for diagnosis of inverter output ......................................... 79
(7) Outdoor unit control failure diagnosis circuit diagram ................................. 80
1.2.2 Troubleshooting ow ............................................................................. 82
(1) List of troubles............................................................................................. 82
(2) Troubleshooting........................................................................................... 84

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1.3 DISASSEMBLY PROCEDURE ......................................................................174
(1) Indoor unit .................................................................................................174
(2) Outdoor unit...............................................................................................186
1.4 ELECTRICAL WIRING...................................................................................188
(1) Indoor unit .................................................................................................188
(2) Outdoor unit...............................................................................................197
1.5 PIPING SYSTEM............................................................................................199