Daikin RXYQ72-408TATJU, RXYQ144TAYDU, RXYQ72TAYDU, RXYQ120TAYDU, RXYQ168TAYDU Service Manual
...
Service
Manual
SiUS341615E
RXYQ72-408TAYDU
RXYQ72-408TATJU
Heat Pump 60 Hz
ED Reference
For items below, please refer to Engineering Data.
Item Model ED No. Page
VRV indoor unit
Specifications
Outdoor-air processing unit FXMQ-MF EDUS39-900A-F10 4
Energy recovery ventilator VAM-G EDUS711116A 2
VRV indoor unit
Option list
Outdoor-air processing unit FXMQ-MF EDUS39-900A-F10 32
Energy recovery ventilator VAM-G EDUS711116A 61
SiUS341615E
RXYQ-TA Series
Heat Pump
R-410A 60 Hz
FXFQ-T
FXFQ-P
FXZQ-M
FXUQ-P
FXEQ-P
FXDQ-M
FXMQ-PB
FXMQ-M
FXHQ-M
FXAQ-P
FXLQ-M, FXNQ-M
FXTQ-TA
FXFQ-T
FXFQ-P
FXZQ-M
FXUQ-P
FXEQ-P
FXDQ-M
FXMQ-PB
FXMQ-M
FXHQ-M
FXAQ-P
FXLQ-M, FXNQ-M
FXTQ-TA
EDUS391400-F14
EDUS391000-F1
EDUS391300-F9
EDUS391437-F15
EDUS391533-F16
EDUS39-600-F2
EDUS391503-F4
EDUS39-900A-F11
EDUS39-600-F5
EDUS391100-F6
EDUS391502-F7
FXTQ-TA Air Handling Unit
EDUS391400-F14
EDUS391000-F1
EDUS391300-F9
EDUS391437-F15
EDUS391533-F16
EDUS39-600-F2
EDUS391503-F4
EDUS39-900A-F11
EDUS39-600-F5
EDUS391100-F6
EDUS391502-F7
FXTQ-TA Air Handling Unit
2-4
2-3
2-3
3-4
3-5
3-4
3-5
3
3
2-3
4-7
4-5
43
40
48
36
27
30
43
25
32
43
28
47
i Table of Contents
SiUS341615E
1. Safety Cautions......................................................................................... vii
1.1 Warnings and Cautions Regarding Safety of Workers................................vii
1.2 Warnings and Cautions Regarding Safety of Users.....................................ix
2. Icons Used ................................................................................................ xii
Part 1 General Information ..............................................................1
1. Model Names of Indoor/Outdoor Units........................................................2
1.1 Indoor Unit.................................................................................................... 2
1.2 Outdoor Unit ................................................................................................. 2
1.3 Air Treatment Equipment ............................................................................. 3
2. External Appearance...................................................................................4
2.1 Indoor Unit.................................................................................................... 4
2.2 Outdoor Unit ................................................................................................. 5
2.3 Air Treatment Equipment ............................................................................. 5
3. Combination of Outdoor Units.....................................................................6
4. Capacity Range...........................................................................................7
4.1 Combination Ratio........................................................................................ 7
4.2 Outdoor Unit Combinations .......................................................................... 7
Part 2 Refrigerant Circuit ................................................................ 8
1. Refrigerant Circuit .......................................................................................9
1.1 Outdoor Unit ................................................................................................. 9
1.2 Indoor Unit.................................................................................................. 15
1.3 Outdoor-Air Processing Unit....................................................................... 17
2. Functional Parts Layout ............................................................................18
2.1 RXYQ72TAYDU ......................................................................................... 18
2.2 RXYQ96/120TAYDU .................................................................................. 19
2.3 RXYQ144/168TAYDU ................................................................................ 20
2.4 RXYQ72TATJU .......................................................................................... 21
2.5 RXYQ96/120TATJU ................................................................................... 22
2.6 RXYQ144/168TATJU ................................................................................. 23
3. Refrigerant Flow for Each Operation Mode...............................................24
3.1 RXYQ72TAYDU, RXYQ72TATJU.............................................................. 24
3.2 RXYQ96/120TAYDU, RXYQ96/120TATJU................................................ 28
3.3 RXYQ144/168TAYDU, RXYQ144/168TATJU............................................ 32
Part 3 Remote Controller ............................................................... 36
1. Applicable Models.....................................................................................37
2. Names and Functions ...............................................................................38
2.1 BRC1E73 ................................................................................................... 38
2.2 Wireless Remote Controller ....................................................................... 40
3. MAIN/SUB Setting.....................................................................................41
3.1 BRC1E73 ................................................................................................... 41
3.2 Wireless Remote Controller ....................................................................... 42
4. Centralized Control Group No. Setting......................................................43
Table of Contents ii
SiUS341615E
4.1 BRC1E73 ................................................................................................... 43
4.2 Wireless Remote Controller ....................................................................... 45
4.3 Group No. Setting Example........................................................................ 46
5. Service Mode ............................................................................................47
5.1 BRC1E73 ................................................................................................... 47
Part 4 Functions and Control......................................................... 49
1. Operation Flowchart (Outdoor Unit) ..........................................................51
2. Stop Control ..............................................................................................52
2.1 Stop due to Error........................................................................................ 52
2.2 When System is in Stop Mode ................................................................... 52
2.3 Slave Unit Stops during Master Unit Operation.......................................... 52
3. Standby Control ........................................................................................53
3.1 Restart Standby.......................................................................................... 53
3.2 Crankcase Heater Control .......................................................................... 53
4. Startup Control..........................................................................................54
4.1 Startup Control in Cooling .......................................................................... 54
4.2 Startup Control in Heating .......................................................................... 55
5. Basic Control.............................................................................................56
5.1 Normal Operation ....................................................................................... 56
5.2 Compressor Capacity Control .................................................................... 57
5.3 Operating Priority and Rotation of Compressors........................................ 58
5.4 Compressor Step Control ........................................................................... 59
5.5 Electronic Expansion Valve Control ........................................................... 59
5.6 Step Control of Outdoor Fans .................................................................... 60
6. Protection Control .....................................................................................61
6.1 High Pressure Protection Control............................................................... 61
6.2 Low Pressure Protection Control................................................................ 62
6.3 Discharge Pipe Protection Control ............................................................. 63
6.4 Compressor Body Protection Control......................................................... 63
6.5 Inverter Protection Control ......................................................................... 64
6.6 Heating Operation Prohibition .................................................................... 65
7. Special Control..........................................................................................66
7.1 Pump Down Residual Operation................................................................ 66
7.2 Outdoor Unit Rotation................................................................................. 66
7.3 Oil Return Operation .................................................................................. 68
7.4 Defrost Operation ....................................................................................... 70
7.5 Drain Pan Heater (Option).......................................................................... 70
8. Outline of Control (Indoor Unit) .................................................................71
8.1 Operation Flowchart ................................................................................... 71
8.2 Set Temperature and Control Temperature ............................................... 73
8.3 Remote Controller Thermistor.................................................................... 75
8.4 Thermostat Control..................................................................................... 77
8.5 Drain Pump Control.................................................................................... 80
8.6 Control of Electronic Expansion Valve ....................................................... 82
8.7 Freeze-up Prevention................................................................................. 83
iii Table of Contents
SiUS341615E
8.8 List of Swing Flap Operations .................................................................... 85
8.9 Hot Start Control (In Heating Only) ............................................................ 86
8.10 Louver Control for Preventing Ceiling Dirt.................................................. 87
8.11 Heater Control (Except FXTQ-TA Models)................................................. 88
8.12 Heater Control (FXTQ-TA Models)............................................................. 89
8.13 3 Step Thermostat Processing (FXTQ-TA Models).................................... 92
8.14 Fan Control (Heater Residual) (FXTQ-TA Models).................................... 93
8.15 Interlocked with External Equipment (FXTQ-TA Models)........................... 93
Part 5 Field Settings ......................................................................95
1. Field Setting from Remote Controller........................................................96
1.1 Wired Remote Controller ............................................................................ 96
1.2 Wireless Remote Controller ....................................................................... 98
1.3 Simplified Remote Controller...................................................................... 99
1.4 Setting Contents and Code No. for Indoor Units...................................... 100
2. Field Settings for Outdoor Unit................................................................118
2.1 Function Setting ....................................................................................... 118
2.2 Settings by DIP Switches ......................................................................... 120
2.3 Settings by BS Buttons............................................................................. 123
2.4 Normal Mode ............................................................................................ 125
2.5 Monitor Mode (Mode 1) ............................................................................ 126
2.6 Setting Mode (Mode 2)............................................................................. 140
3. Test Operation ........................................................................................157
3.1 Checks before Test Operation ................................................................. 157
3.2 Checkpoints.............................................................................................. 157
3.3 Check Work Prior to Turn Power Supply ON ........................................... 158
3.4 Turn Power ON ........................................................................................ 159
Part 6 Service Diagnosis.............................................................. 160
1. Symptom-based Troubleshooting ...........................................................163
1.1 Indoor Unit Overall ................................................................................... 163
1.2 With Optional Infrared Floor Sensor......................................................... 166
2. Service Check Function ..........................................................................167
2.1 Wired Remote Controller .......................................................................... 167
2.2 Wireless Remote Controller ..................................................................... 169
2.3 Error Codes and Descriptions .................................................................. 171
2.4 Error Codes - Sub Codes ......................................................................... 173
3. Troubleshooting by Error Code...............................................................174
3.1 External Protection Device Abnormality................................................... 174
3.2 Indoor Unit PCB Abnormality ................................................................... 176
3.3 Drain Level Control System Abnormality.................................................. 177
3.4 Fan Motor Lock, Overload........................................................................ 179
3.5 Indoor Fan Motor Abnormality.................................................................. 182
3.6 Overload/Overcurrent/Lock of Indoor Fan Motor...................................... 186
3.7 Blower Motor Not Running ....................................................................... 187
3.8 Indoor Fan Motor Status Abnormality....................................................... 188
Table of Contents iv
SiUS341615E
3.9 Low Indoor Airflow.................................................................................... 189
3.10 Swing Flap Motor Abnormality ................................................................. 190
3.11 Power Supply Voltage Abnormality .......................................................... 192
3.12 Blower Motor Stops for Over/Under Voltage ............................................ 193
3.13 Electronic Expansion Valve Coil Abnormality, Dust Clogging .................. 194
3.14 Drain Level above Limit ............................................................................ 195
3.15 Capacity Determination Device Abnormality ............................................ 196
3.16 Transmission Abnormality between Indoor Unit PCB and Fan PCB........ 197
3.17 Blower Motor Communication Error ......................................................... 199
3.18 Thermistor Abnormality ............................................................................ 200
3.19 Combination Error between Indoor Unit PCB and Fan PCB .................... 201
3.20 Blower Motor HP Mismatch...................................................................... 202
3.21 Indoor Blower Does Not Have Required Parameters to Function............ 203
3.22 Remote Sensor Abnormality .................................................................... 204
3.23 Humidity Sensor System Abnormality ...................................................... 205
3.24 Infrared Presence/Floor Sensor Error ...................................................... 206
3.25 Remote Controller Thermistor Abnormality .............................................. 211
3.26 Outdoor Unit Main PCB Abnormality ........................................................ 212
3.27 Current Leakage Detection ...................................................................... 213
3.28 Missing of Leakage Detection Core ......................................................... 214
3.29 Actuation of High Pressure Switch ........................................................... 215
3.30 Actuation of Low Pressure Sensor ........................................................... 217
3.31 Inverter Compressor Motor Lock.............................................................. 219
3.32 Compressor Damage Alarm..................................................................... 221
3.33 Outdoor Fan Motor Abnormality ............................................................... 223
3.34 Electronic Expansion Valve Coil Abnormality........................................... 226
3.35 Discharge Pipe Temperature Abnormality ............................................... 228
3.36 Wet Alarm................................................................................................. 230
3.37 Refrigerant Overcharged .......................................................................... 232
3.38 Harness Abnormality (between Outdoor Unit Main PCB and
Inverter PCB)............................................................................................ 233
3.39 Outdoor Fan Motor Signal Abnormality .................................................... 234
3.40 Thermistor Abnormality ............................................................................ 235
3.41 High Pressure Sensor Abnormality .......................................................... 237
3.42 Low Pressure Sensor Abnormality........................................................... 239
3.43 Inverter PCB Abnormality......................................................................... 241
3.44 Reactor Temperature Rise Abnormality ................................................... 243
3.45 Inverter Radiation Fin Temperature Rise Abnormality ............................. 244
3.46 Inverter Compressor Instantaneous Overcurrent ..................................... 245
3.47 Inverter Compressor Overcurrent............................................................. 247
3.48 Inverter Compressor Startup Abnormality ................................................ 249
3.49 Transmission Error between Inverter PCB and
Outdoor Unit Main PCB............................................................................ 252
3.50 Power Supply Voltage Imbalance ............................................................ 254
3.51 Reactor Temperature Abnormality ........................................................... 256
3.52 Inverter Radiation Fin Temperature Abnormality ..................................... 257
3.53 Field Setting after Replacing Outdoor Unit Main PCB Abnormality or
Combination of PCB Abnormality............................................................. 259
v Table of Contents
SiUS341615E
3.54 Refrigerant Shortage ................................................................................ 260
3.55 Reverse Phase, Open Phase................................................................... 261
3.56 Power Supply Insufficient or Instantaneous Abnormality ......................... 262
3.57 Check Operation not Executed ................................................................ 265
3.58 Transmission Error between Indoor Units and Outdoor Units.................. 266
3.59 Transmission Error between Remote Controller and Indoor Unit............. 269
3.60 Transmission Error between Outdoor Units ............................................. 270
3.61 Transmission Error between Main and Sub Remote Controllers ............. 276
3.62 Transmission Error between Indoor Unit and
Outdoor Unit in the Same System............................................................ 277
3.63 Improper Combination of Indoor Unit and Outdoor Unit,
Indoor Unit and Remote Controller........................................................... 278
3.64 Incorrect Electric Heater Capacity Setting................................................ 283
3.65 Address Duplication of Centralized Controller.......................................... 284
3.66 Transmission Error between Centralized Controller and Indoor Unit ....... 285
3.67 System not Set yet ................................................................................... 288
3.68 System Abnormality, Refrigerant System Address Undefined ................. 289
4. Check ......................................................................................................291
4.1 High Pressure Check ............................................................................... 291
4.2 Low Pressure Check ................................................................................ 292
4.3 Superheat Operation Check..................................................................... 293
4.4 Power Transistor Check ........................................................................... 295
4.5 Refrigerant Overcharge Check................................................................. 296
4.6 Refrigerant Shortage Check..................................................................... 297
4.7 Vacuuming and Dehydration Procedure .................................................. 298
4.8 Thermistor Check ..................................................................................... 299
4.9 Pressure Sensor Check ........................................................................... 302
4.10 Broken Wire Check of the Relay Wires .................................................... 303
4.11 Fan Motor Connector Check (Power Supply Cable) ................................ 304
4.12 Fan Motor Connector Check (Signal Cable) ............................................ 304
4.13 Electronic Expansion Valve Coil Check ................................................... 305
Part 7 Appendix............................................................................ 306
1. Wiring Diagrams......................................................................................307
1.1 Outdoor Unit ............................................................................................. 307
1.2 Indoor Unit................................................................................................ 313
1.3 Air Treatment Equipment ......................................................................... 320
Table of Contents vi
Safety Cautions SiUS341615E
1. Safety Cautions
Be sure to read the following safety cautions before conducting repair work.
After the repair work is complete, be sure to conduct a test operation to ensure that the equipment
operates normally, and explain the cautions for operating the product to the customer.
Caution Items The caution items are classified into Warning and Caution. The Warning items are
especially important since death or serious injury can result if they are not followed closely. The
Caution items can also lead to serious accidents under some conditions if they are not
followed. Therefore, be sure to observe all the safety caution items described below.
Pictograms This symbol indicates the item for which caution must be exercised.
The pictogram shows the item to which attention must be paid.
This symbol indicates the prohibited action.
The prohibited item or action is shown in the illustration or near the symbol.
This symbol indicates the action that must be taken, or the instruction.
The instruction is shown in the illustration or near the symbol.
1.1 Warnings and Cautions Regarding Safety of Workers
Warning
Do not store the equipment in a room with fire sources (e.g. naked flames,
gas appliances, electric heaters).
Be sure to disconnect the power cable from the socket before
disassembling equipment for repair.
Working on equipment that is connected to the power supply may cause an
electrical shock.
If it is necessary to supply power to the equipment to conduct the repair or
inspecting the circuits, do not touch any electrically charged sections of the
equipment.
If refrigerant gas is discharged during repair work, do not touch the
discharged refrigerant gas.
Refrigerant gas may cause frostbite.
When disconnecting the suction or discharge pipe of the compressor at
the welded section, evacuate the refrigerant gas completely at a wellventilated place first.
If there is gas remaining inside the compressor, the refrigerant gas or
refrigerating machine oil discharges when the pipe is disconnected, and it may
cause injury.
If refrigerant gas leaks during repair work, ventilate the area.
Refrigerant gas may generate toxic gases when it contacts flames.
vii
Be sure to discharge the capacitor completely before conducting repair
work.
The step-up capacitor supplies high-voltage electricity to the electrical
components of the outdoor unit.
A charged capacitor may cause an electrical shock.
SiUS341615E Safety Cautions
Warning
Do not turn the air conditioner on or off by plugging in or unplugging the
power cable.
Plugging or unplugging the power cable to operate the equipment may cause
an electrical shock or fire.
Be sure to wear a safety helmet, gloves, and a safety belt when working
in a high place (more than 2 m (6.5 ft)).
Insufficient safety measures may cause a fall.
In case of R-32 and R-410A refrigerant models, be sure to use pipes, flare
nuts and tools intended for exclusive use with R-32 and R-410A
refrigerant.
The use of materials for R-22 refrigerant models may cause a serious accident,
such as damage to the refrigerant cycle or equipment failure.
Do not mix air or gas other than the specified refrigerant (R-32, R-410A,
R-22) in the refrigerant system.
If air enters the refrigerating system, excessively high pressure results, causing
equipment damage and injury.
Caution
Do not repair electrical components with wet hands.
Working on the equipment with wet hands may cause an electrical shock.
Do not clean the air conditioner with water.
Washing the unit with water may cause an electrical shock.
Be sure to provide an earth/grounding when repairing the equipment in a
humid or wet place, to avoid electrical shocks.
Be sure to turn off the power switch and unplug the power cable when
cleaning the equipment.
The internal fan rotates at a high speed, and may cause injury.
Be sure to conduct repair work with appropriate tools.
The use of inappropriate tools may cause injury.
viii
Safety Cautions SiUS341615E
Caution
Be sure to check that the refrigerating cycle section has cooled down
enough before conducting repair work.
Working on the unit when the refrigerating cycle section is hot may cause
burns.
Conduct welding work in a well-ventilated place.
Using a welder in an enclosed room may cause oxygen deficiency.
1.2 Warnings and Cautions Regarding Safety of Users
Warning
Do not store the equipment in a room with fire sources (e.g. naked flames,
gas appliances, electric heaters).
Be sure to use parts listed in the service parts list of the applicable model
and appropriate tools to conduct repair work. Never attempt to modify the
equipment.
The use of inappropriate parts or tools may cause an electrical shock,
excessive heat generation or fire.
If the power cable and lead wires are scratched or have deteriorated, be
sure to replace them.
Damaged cable and wires may cause an electrical shock, excessive heat
generation or fire.
Do not use a joined power cable or extension cable, or share the same
power outlet with other electrical appliances, since it may cause an
electrical shock, excessive heat generation or fire.
Be sure to use an exclusive power circuit for the equipment, and follow
the local technical standards related to the electrical equipment, the
internal wiring regulations, and the instruction manual for installation
when conducting electrical work.
Insufficient power circuit capacity and improper electrical work may cause an
electrical shock or fire.
Be sure to use the specified cable for wiring between the indoor and
outdoor units.
Make the connections securely and route the cable properly so that there is no
force pulling the cable at the connection terminals.
Improper connections may cause excessive heat generation or fire.
ix
SiUS341615E Safety Cautions
Warning
When wiring between the indoor and outdoor units, make sure that the
terminal cover does not lift off or dismount because of the cable.
If the cover is not mounted properly, the terminal connection section may cause
an electrical shock, excessive heat generation or fire.
Do not damage or modify the power cable.
Damaged or modified power cables may cause an electrical shock or fire.
Placing heavy items on the power cable, or heating or pulling the power cable
may damage it.
Do not mix air or gas other than the specified refrigerant (R-32, R-410A,
R-22) in the refrigerant system.
If air enters the refrigerating system, excessively high pressure results, causing
equipment damage and injury.
If the refrigerant gas leaks, be sure to locate the leakage and repair it
before charging the refrigerant. After charging the refrigerant, make sure
that there is no leakage.
If the leakage cannot be located and the repair work must be stopped, be sure
to pump-down, and close the service valve, to prevent refrigerant gas from
leaking into the room. Refrigerant gas itself is harmless, but it may generate
toxic gases when it contacts flames, such as those from fan type and other
heaters, stoves and ranges.
When relocating the equipment, make sure that the new installation site
has sufficient strength to withstand the weight of the equipment.
If the installation site does not have sufficient strength or if the installation work
is not conducted securely, the equipment may fall and cause injury.
Check to make sure that the power cable plug is not dirty or loose, then
insert the plug into a power outlet securely.
If the plug is dusty or has a loose connection, it may cause an electrical shock
or fire.
When replacing the coin battery in the remote controller, be sure to
dispose of the old battery to prevent children from swallowing it.
If a child swallows the coin battery, see a doctor immediately.
Caution
Installation of a leakage breaker is necessary in some cases depending
on the conditions of the installation site, to prevent electrical shocks.
x
Safety Cautions SiUS341615E
Caution
Do not install the equipment in a place where there is a possibility of
combustible gas leaks.
If combustible gas leaks and remains around the unit, it may cause a fire.
Check to see if parts and wires are mounted and connected properly, and
if the connections at the soldered or crimped terminals are secure.
Improper installation and connections may cause excessive heat generation,
fire or an electrical shock.
If the installation platform or frame has corroded, replace it.
A corroded installation platform or frame may cause the unit to fall, resulting in
injury.
Check the earth/grounding, and repair it if the equipment is not properly
earthed/grounded.
Improper earth/grounding may cause an electrical shock.
Be sure to measure insulation resistance after the repair, and make sure
that the resistance is 1 MΩ or higher.
Faulty insulation may cause an electrical shock.
Be sure to check the drainage of the indoor unit after the repair.
Faulty drainage may cause water to enter the room and wet the furniture and
floor.
Do not tilt the unit when removing it.
The water inside the unit may spill and wet the furniture and floor.
xi
SiUS341615E Icons Used
2. Icons Used
The following icons are used to attract the attention of the reader to specific information.
Icon Type of
Information
Warning A Warning is used when there is danger of personal injury.
Warning
Caution A Caution is used when there is danger that the reader, through
Caution
Note A Note provides information that is not indispensable, but may
Note:
Reference A Reference guides the reader to other places in this binder or
Description
incorrect manipulation, may damage equipment, loose data, get
an unexpected result or has to restart (part of) a procedure.
nevertheless be valuable to the reader, such as tips and tricks.
in this manual, where he/she will find additional information on a
specific topic.
xii
SiUS341615E
Part 1
General Information
1. Model Names of Indoor/Outdoor Units........................................................2
1.1 Indoor Unit.................................................................................................... 2
1.2 Outdoor Unit ................................................................................................. 2
1.3 Air Treatment Equipment ............................................................................. 3
2. External Appearance...................................................................................4
2.1 Indoor Unit.................................................................................................... 4
2.2 Outdoor Unit ................................................................................................. 5
2.3 Air Treatment Equipment ............................................................................. 5
3. Combination of Outdoor Units.....................................................................6
4. Capacity Range...........................................................................................7
4.1 Combination Ratio........................................................................................ 7
4.2 Outdoor Unit Combinations .......................................................................... 7
1 General Information
SiUS341615E Model Names of Indoor/Outdoor Units
1. Model Names of Indoor/Outdoor Units
1.1 Indoor Unit
Capacity Range (ton) 0.6 0.8 1 1.25 1.5 2 2.5 3 3.5 4 4.5 5 6 8 Power
Capacity Index 7.5 9.5 12 15 18 20 24 30 36 42 48 54 60 72 96
Ceiling Mounted Cassette
(Round Flow with Sensing) Type
Ceiling Mounted Cassette
(Round Flow) Type
4 Way Ceiling Mounted
Cassette (2'×2') Type
4-Way Blow CeilingSuspended Type
One Way Blow Cassette TypeFXEQ07P09P12P15P18P—24P————————
Slim Ceiling Mounted Duct Type
Ceiling Mounted Duct Type
(Middle and High Static Pressure)
Ceiling Mounted Duct Type FXMQ —————————————72M96M
Ceiling Suspended Type FXHQ — — 12M — — — 24M — 36M ——————
Wall Mounted Type FXAQ 07P 09P 12P — 18P — 24P ————————
Floor Standing Type FXLQ
Concealed Floor Standing Type
Air Handling Unit FXTQ —
FXFQ07T09T12T15T18T—24T30T36T—48T————
FXFQ—09P12P—18P—24P30P36P—48P————
FXZQ07M09M12M15M18M—————————— VJU9
FXUQ—————18P24P30P36P——————
FXDQ07M09M12M—18M—24M————————
FXMQ
07PB 09PB 12PB 15PB 18PB
07M—————————————— VJU9
—09M12M—18M—24M———————— VJU
07M—————————————— VJU9
FXNQ
—09M12M—18M—24M———————— VJU
09TA 12TA
—
18TA
—
24PB 30PB 36PB
—
24TA 30TA 36TA 42TA 48TA 54TA 60TA
—
48PB 54PB
———
——VJUA(D)
Supply,
Standard
VJU
VJU
VJ : 1 phase, 208/230 V, 60 Hz
U(VJU
): Standard Symbol
1.2 Outdoor Unit
Capacity Range (ton) 6 8 10 12 14 16 18 20
Capacity Index 72 96 120 144 168 192 216 240
Heat Pump
Capacity Range (ton) 22 24 26 28 30 32 34
Capacity Index 264 288 312 336 360 384 408
Heat Pump
YD : 3 phase, 460 V, 60 Hz
TJ : 3 phase, 208/230 V, 60 Hz
U(TJU
): Standard Symbol
460 V RXYQ- 72TA 96TA 120TA 144TA 168TA 192TA 216TA 240TA YDU
208/230 V
460 V RXYQ- 264TA 288TA 312TA 336TA 360TA 384TA 408TA YDU
208/230 V
RXYQ- 72TA 96TA 120TA 144TA 168TA 192TA 216TA 240TA TJU
RXYQ- 264TA 288TA 312TA 336TA 360TA 384TA 408TA TJU
Power Supply,
Standard
Power Supply,
Standard
General Information 2
Model Names of Indoor/Outdoor Units SiUS341615E
1.2.1 Combination of Outdoor Units (Heat Pump 460 V)
RXYQ-TAYDU
Model name RXYQ72TAYDU RXYQ96TAYDU RXYQ120TAYDU RXYQ144TAYDU RXYQ168TAYDU
Outdoor unit 1 RXYQ72TAYDU RXYQ96TAYDU RXYQ120TAYDU RXYQ144TAYDU RXYQ168TAYDU
Model name RXYQ192TAYDU RXYQ216TAYDU RXYQ240TAYDU RXYQ264TAYDU RXYQ288TAYDU
Outdoor unit 1 RXYQ72TAYDU RXYQ96TAYDU RXYQ120TAYDU RXYQ120TAYDU RXYQ144TAYDU
Outdoor unit 2 RXYQ120TAYDU RXYQ120TAYDU RXYQ120TAYDU RXYQ144TAYDU RXYQ144TAYDU
Model name RXYQ312TAYDU RXYQ336TAYDU RXYQ360TAYDU RXYQ384TAYDU RXYQ408TAYDU
Outdoor unit 1 RXYQ144TAYDU RXYQ168TAYDU RXYQ120TAYDU RXYQ96TAYDU RXYQ96TAYDU
Outdoor unit 2 RXYQ168TAYDU RXYQ168TAYDU RXYQ120TAYDU RXYQ120TAYDU RXYQ144TAYDU
Outdoor unit 3 — — RXYQ120TAYDU RXYQ168TAYDU RXYQ168TAYDU
1.2.2 Combination of Outdoor Units (Heat Pump 208/230 V)
RXYQ-TATJU
Model name RXYQ72TATJU RXYQ96TATJU RXYQ120TATJU RXYQ144TATJU RXYQ168TATJU
Outdoor unit 1 RXYQ72TATJU RXYQ96TATJU RXYQ120TATJU RXYQ144TATJU RXYQ168TATJU
Model name RXYQ192TATJU RXYQ216TATJU RXYQ240TATJU RXYQ264TATJU RXYQ288TATJU
Outdoor unit 1 RXYQ72TATJU RXYQ96TATJU RXYQ120TATJU RXYQ120TATJU RXYQ144TATJU
Outdoor unit 2 RXYQ120TATJU RXYQ120TATJU RXYQ120TATJU RXYQ144TATJU RXYQ144TATJU
Model name RXYQ312TATJU RXYQ336TATJU RXYQ360TATJU RXYQ384TATJU RXYQ408TATJU
Outdoor unit 1 RXYQ144TATJU RXYQ168TATJU RXYQ120TATJU RXYQ96TATJU RXYQ96TATJU
Outdoor unit 2 RXYQ168TATJU RXYQ168TATJU RXYQ120TATJU RXYQ120TATJU RXYQ144TATJU
Outdoor unit 3 — — RXYQ120TATJU RXYQ168TATJU RXYQ168TATJU
1.3 Air Treatment Equipment
Outdoor-Air Processing Unit
Series Model Name
FXMQ 48MF 72MF 96MF VJU
Energy Recovery Ventilator (VAM Series)
Series Model Name
VAM 300G 470G 600G 1200G VJU
VJ : 1 phase, 208/230 V, 60 Hz
U(VJU
) : Standard Symbol
Power Supply,
Standard
Power Supply,
Standard
3 General Information
SiUS341615E External Appearance
2. External Appearance
2.1 Indoor Unit
Ceiling mounted cassette (Round flow with sensing) type
FXFQ-T
Shown with BYCQ125B-W1
Ceiling mounted cassette (Round flow) type
FXFQ-P
Shown with BYCP125K-W1
4 way ceiling mounted cassette (2’×2’) type
FXZQ-M
Shown with BYFQ60B8W1U
4-way blow ceiling-suspended type
FXUQ-P
Ceiling mounted duct type
FXMQ-M
Ceiling suspended type
FXHQ-M
Wall mounted type
FXAQ-P
Floor standing type
FXLQ-M
One way blow cassette type
FXEQ-P
Slim ceiling mounted duct type
FXDQ-M
Ceiling mounted duct type (Middle and high static pressure)
FXMQ-PB
Concealed floor standing type
FXNQ-M
Air handling unit
FXTQ-TA
General Information 4
External Appearance SiUS341615E
2.2 Outdoor Unit
Single Outdoor Unit
Double Outdoor Unit
RXYQ192TA RXYQ216/240/264/288/312/336TA
RXYQ72TA
RXYQ96/120/144/168TA
Triple Outdoor Unit
RXYQ360/384/408TA
2.3 Air Treatment Equipment
Outdoor-air processing unit
FXMQ-MF
Energy recovery ventilator
(VAM series)
VAM-G
5 General Information
SiUS341615E Combination of Outdoor Units
3. Combination of Outdoor Units
System capacity
ton HP 72 96 120 144 168
67.51 O
8101 O
10 12.5 1 O
12 15 1 O
14 17.5 1 O
16 20 2 OO
18 22.5 2 OO
20 25 2 OO
22 27.5 2 OO
24 30 2 OO
26 323.5 2 OO
28 35 2 OO
30 37.5 3 OOO
34 42.5 3 OOO
Note: 1 For multiple connection, the outdoor unit multi connection piping kit (separately sold) is required.
Number
of units
Module
Outdoor Unit Multi Connection Piping Kit
BHFR22P100U
BHFR22P151U32 40 3 OO O
1
—
General Information 6
Capacity Range SiUS341615E
4. Capacity Range
4.1 Combination Ratio
Combination ratio =
Type
Single outdoor units
Triple outdoor units 130%
Total capacity index of the indoor units
Capacity index of the outdoor units
Min.
combination
ratio
50% 200% ∗1 130%
Types of connected indoor units Type of connected air treatment equipments
When using
only FXDQ,
FXMQ-PB,
FXAQ
When using
only FXTQ,
or at least one
FXFQ07 or
FXFQ09
Max. combination ratio
Other indoor
unit models
200% ∗1
FXMQ-MF
When FXMQ-MF is only
connected
100% 100% ∗2Double outdoor units 160% ∗1
When FXMQ-MF and
indoor units are
connected
Notes: ∗1. If the operational capacity of indoor units is more than 130%, low airflow operation is enforced in all the
indoor units. Refer to the table below.
∗2. When outdoor-air processing units (FXMQ-MF) and standard indoor units are connected, the total
connection capacity of the outdoor-air processing units (FXMQ-MF) must not exceed 30% of the capacity
index of the outdoor units. And the connection ratio must not exceed 100%.
Indoor unit fan tap setting
Indoor units fan speed limitation related to connection capacity and outdoor air temperature for energy saving.
Default value = 0
Value [2-34] Indoor unit fan tap setting
0 Fan speed is limited to L tap when indoor units capacity ≥ 130%.
1 In heating mode, fan speed is limited to L tap when indoor units capacity ≥ 130%.
2 Fan speed follows a setting of the remote controller (not limited by indoor units connection capacity).
3
4
5
Fan speed is limited to L tap when outdoor air temperature goes down to below 29.5°C (85.1°F). It returns to remote
controller setting when outdoor air temperature goes up to over 32.5°C (90.5 °F).
Fan speed is limited to L tap when outdoor air temperature goes down to below 23.5°C (74.3°F). It returns to remote
controller setting when outdoor air temperature goes up to over 26.5°C (79.7°F).
Fan speed is limited to L tap when outdoor air temperature goes down to below 19.3°C (66.7°F). It returns to remote
controller setting when outdoor air temperature goes up to over 22.3°C (72.1°F).
4.2 Outdoor Unit Combinations
Capacity Range 6 ton 8 ton 10 ton 12 ton 14 ton 16 ton 18 ton 20 ton 22 ton
RXYQ
Max. Number of
Connectable Indoor Units
Total Capacity Index of
Indoor Units to be
Connected ∗1
Capacity Range 24 ton 26 ton 28 ton 30 ton 32 ton 34 ton 36 ton 38 ton
RXYQ
Max. Number of
Connectable Indoor Units
Total Capacity Index of
Indoor Units to be
Connected ∗1
72TAYDU
72TATJU
12 16 20 25 29 33 37 41 45
36~93
(144)
288TAYDU
288TATJU
49 54 58 62 64 64 64 64
144~374
(461)
Note: ∗1. Values inside brackets are based on connection of indoor units rated at maximum capacity, 200% for single
outdoor units, 160% for double outdoor units, and 130% for triple outdoor units.
7 General Information
96TAYDU
96TATJU
48~124
(192)
312TAYDU
312TATJU
156~405
(499)
120TAYDU
120TATJU
60~156
(240)
336TAYDU
336TATJU
168~436
(538)
144TAYDU
144TATJU
72~187
(288)
360TAYDU
360TATJU
180~468
(468)
168TAYDU
168TATJU
84~218
(336)
384TAYDU
384TATJU
192~499
(499)
192TAYDU
192TATJU
96~249
(307)
408TAYDU
408TATJU
204~530
(530)
216TAYDU
216TATJU
108~280
(346)
432TAYDU
432TATJU
216~561
(561)
240TAYDU
240TATJU
120~312
(384)
456TAYDU
456TATJU
228~592
(592)
264TAYDU
264TATJU
132~343
(422)
SiUS341615E
Part 2
Refrigerant Circuit
1. Refrigerant Circuit .......................................................................................9
1.1 Outdoor Unit ................................................................................................. 9
1.2 Indoor Unit.................................................................................................. 15
1.3 Outdoor-Air Processing Unit....................................................................... 17
2. Functional Parts Layout ............................................................................18
2.1 RXYQ72TAYDU ......................................................................................... 18
2.2 RXYQ96/120TAYDU .................................................................................. 19
2.3 RXYQ144/168TAYDU ................................................................................ 20
2.4 RXYQ72TATJU .......................................................................................... 21
2.5 RXYQ96/120TATJU ................................................................................... 22
2.6 RXYQ144/168TATJU ................................................................................. 23
3. Refrigerant Flow for Each Operation Mode...............................................24
3.1 RXYQ72TAYDU, RXYQ72TATJU.............................................................. 24
3.2 RXYQ96/120TAYDU, RXYQ96/120TATJU................................................ 28
3.3 RXYQ144/168TAYDU, RXYQ144/168TATJU............................................ 32
Refrigerant Circuit 8
Refrigerant Circuit SiUS341615E
1. Refrigerant Circuit
1.1 Outdoor Unit
1.1.1 RXYQ72TAYDU, RXYQ72TATJU
No. in
piping
diagram
(1) M1C Inverter compressor Inverter driven compressor is operated in multi-steps according to Te.
(2) M1F Inverter fan
(3) Y1E
(4) Y2E
(5) Y1S
(6) Y2S
(7) Y3S Solenoid valve (Oil return) Used to control the amount of oil from the oil separator to the compressor.
(8) S1NPH High pressure sensor Used to detect high pressure.
(9) S1NPL Low pressure sensor Used to detect low pressure.
(10) S1PH High pressure switch
(11) — Pressure regulating valve
(12) — Subcooling heat exchanger Used to subcooling liquid refrigerant from the electronic expansion valve.
(13) — Capillary tube Used to return the refrigerating oil separated through the oil separator to the compressor.
(14) R1T Thermistor (Outdoor air) Used to detect outdoor air temperature, correct discharge pipe temperature, and others.
(15) R21T Thermistor (Discharge pipe)
(16) R3T Thermistor (Accumulator inlet) Used to detect gas pipe temperature at the accumulator inlet.
(17) R4T
(18) R5T
(19) R6T
(20) R7T
Electric
symbol
Name Function
Electronic expansion valve
(Main)
Electronic expansion valve
(Injection)
Solenoid valve
(Four way valve)
Solenoid valve
(Accumulator oil return)
Thermistor (Heat exchanger
liquid pipe)
Thermistor (Subcooling heat
exchanger liquid pipe)
Thermistor (Subcooling heat
exchanger gas pipe)
Thermistor
(Heat exchanger deicer)
Because the system is an air heat exchange type, the fan is operated at 10-step rotation
speed by using the inverter.
Fully open during cooling operation.
PI control is applied to keep the outlet superheated degree of subcooling heat exchanger
constant.
Used to switch the operation mode between cooling and heating.
Used to return oil from the accumulator to the compressor.
In order to prevent the increase of high pressure when an error occurs, this switch is
activated at high pressure of 4.0 MPa (580 psi) or more to stop the compressor operation.
This valve opens at a pressure of 4.0 MPa (580 psi) for prevention of pressure increase,
thus resulting in no damage of functional parts due to the increase of pressure in
transportation or storage.
Used to detect discharge pipe temperature, make the temperature protection control of
compressor, and others.
This detects temperature of liquid pipe between the air heat exchanger and main
electronic expansion valve. Used to make judgements on the recover or discharge
refrigerants to the refrigerant regulator.
This detects temperature of liquid pipe between the main electronic expansion valve and
subcooling heat exchanger.
This detects temperature of gas pipe on the evaporation side of subcooling heat
exchanger. Used to exercise the constant control of superheated degree at the outlet of
subcooling heat exchanger.
Used to detect liquid pipe temperature of air heat exchanger.
9 Refrigerant Circuit
SiUS341615E Refrigerant Circuit
(3)
Electronic
(17)
valve
expansion
(20)
Fan
(2)
Heat sink
Heat exchanger
M
(5)
(14)
Four way valve
sensor
High pressure
(8)
S1NPH
C: 3D085567A
Oil
separator
Filter
Check valve
(10)
S1PH
switch
High pressure
(15)
Filter
(7)
Solenoid valve
SV
M1C
Compressor
(1)
Capillary tube
(13)
(19)
(12)
Double tube
heat exchanger
Stop valve (With service port φ5/16 in. (7.9mm) flare connection)
pipe
Liquid
(18)
Filter Filter
valve
Electronic
expansion
(4)
Fusible
plug
valve
Pressure
regulating
(11)
Gas
pipe
S1NPL
sensor
Low pressure
(9)
(16)
Accumulator
port
Charge
tube
Capillary
SV
FilterFilter
(6)
valve
Solenoid
Refrigerant Circuit 10
Refrigerant Circuit SiUS341615E
1.1.2 RXYQ96/120TAYDU, RXYQ96/120TATJU
No. in
piping
diagram
(1) M1C Inverter compressor Inverter compressor is operated in multi-steps according to Te.
(2) M1F
(3) M2F
(4) Y1E
(5) Y2E
(6) Y1S
(7) Y2S
(8) Y3S Solenoid valve (Oil return) Used to control the amount of oil from the oil separator to the compressor.
(9) S1NPH High pressure sensor Used to detect high pressure.
(10) S1NPL Low pressure sensor Used to detect low pressure.
(11) S1PH High pressure switch
(12) — Pressure regulating valve
(13) — Subcooling heat exchanger Used to subcooling liquid refrigerant from the electronic expansion valve.
(14) — Capillary tube Used to return the refrigerating oil separated through the oil separator to the compressor.
(15) R1T Thermistor (Outdoor air) Used to detect outdoor air temperature, correct discharge pipe temperature, and others.
(16) R21T Thermistor (Discharge pipe)
(17) R3T Thermistor (Accumulator inlet) Used to detect gas pipe temperature at the accumulator inlet.
(18) R4T
(19) R5T
(20) R6T
(21) R7T
(22) R8T
Electric
symbol
Name Function
Inverter fan
Electronic expansion valve
(Main)
Electronic expansion valve
(Injection)
Solenoid valve
(Four way valve)
Solenoid valve
(Accumulator oil return)
Thermistor (Heat exchanger
liquid pipe)
Thermistor (Subcooling heat
exchanger liquid pipe)
Thermistor (Subcooling heat
exchanger gas pipe)
Thermistor
(Heat exchanger deicer)
Thermistor
(Compressor body)
Because the system is an air heat exchange type, the fan is operated at 10-step rotation
speed by using the inverter.
Fully open during cooling operation.
PI control is applied to keep the outlet superheated degree of subcooling heat exchanger
constant.
Used to switch the operation mode between cooling and heating.
Used to return oil from the accumulator to the compressor.
In order to prevent the increase of high pressure when an error occurs, this switch is
activated at high pressure of 4.0 MPa (580 psi) or more to stop the compressor operation.
This valve opens at a pressure of 4.0 MPa (580 psi) for prevention of pressure increase,
thus resulting in no damage of functional parts due to the increase of pressure in
transportation or storage.
Used to detect discharge pipe temperature, make the temperature protection control of
compressor, and others.
This detects temperature of liquid pipe between the air heat exchanger and main
electronic expansion valve. Used to make judgements on the recover or discharge
refrigerants to the refrigerant regulator.
This detects temperature of liquid pipe between the main electronic expansion valve and
subcooling heat exchanger.
This detects temperature of gas pipe on the evaporation side of subcooling heat
exchanger. Used to exercise the constant control of superheated degree at the outlet of
subcooling heat exchanger.
Used to detect liquid pipe temperature of air heat exchanger.
Detects compressor surface temperature, this switch is activated at surface temperature
of 120°C (248°F) or more to stop the compressor operation.
11 Refrigerant Circuit
SiUS341615E Refrigerant Circuit
(15)
C: 3D085598A
(4)
Electronic
(20)
(18)
valve
expansion
(21)
Fan
(2)
Heat sink
Electronic
(5)
Heat exchanger
M
Fan
(3)
valve
expansion
(6)
M
Four way valve
sensor
(9)
High pressure
S1NPH
Oil
separator
Filter
Check valve
Filter
(8)
Solenoid valve
SV
(14)
Capillary tube
valve
Pressure
regulating
S1NPL
sensor
Low pressure
(10)
S1PH
switch
High pressure
(11)
(16)
M1C
Compressor
(1)
(22)
(12)
port
Charge
FilterFilter
(13)
Double tube
heat exchanger
Stop valve (With service port φ5/16 in. (7.9mm) flare connection)
pipe
Liquid
Filter Filter
(19)
plug
Fusible
Accumulator
Gas
(17)
pipe
tube
Capillary
(7)
SV
valve
Solenoid
Refrigerant Circuit 12
Refrigerant Circuit SiUS341615E
1.1.3 RXYQ144/168TAYDU, RXYQ144/168TATJU
No. in
piping
diagram
(1) M1C
(2) M2C
(3) M1F
(4) M2F
(5) Y1E
(6) Y2E
(7) Y1S
(8) Y2S
(9) Y3S Solenoid valve (Oil return 1)
(10) Y4S Solenoid valve (Oil return 2)
(11) S1NPH High pressure sensor Used to detect high pressure.
(12) S1NPL Low pressure sensor Used to detect low pressure.
(13) S1PH
(14) S2PH
(15) — Pressure regulating valve
(16) — Subcooling heat exchanger Used to subcooling liquid refrigerant from the electronic expansion valve.
(17) —
(18) —
(19) R1T
(20) R1T
(21) R21T
(22) R22T
(23) R3T Thermistor (Accumulator inlet) Used to detect gas pipe temperature at the accumulator inlet.
(24) R4T
(25) R5T
(26) R6T
(27) R7T
Electric
symbol
Name Function
Inverter compressor Inverter compressor is operated in multi-steps according to Te.
Inverter fan
Electronic expansion valve
(Main)
Electronic expansion valve
(Injection)
Solenoid valve
(Four way valve)
Solenoid valve
(Accumulator oil return)
High pressure switch
(For M1C compressor)
High pressure switch
(For M2C compressor)
Capillary tube Used to return the refrigerating oil separated through the oil separator to the compressor.
Thermistor (Outdoor air)
(A1P)
Thermistor
(Radiation fin) (A3P)
Thermistor
(M1C discharge pipe)
Thermistor
(M2C discharge pipe)
Thermistor (Heat exchanger
liquid pipe)
Thermistor (Subcooling heat
exchanger liquid pipe)
Thermistor (Subcooling heat
exchanger gas pipe)
Thermistor
(Heat exchanger deicer)
Because the system is an air heat exchange type, the fan is operated at 10-step rotation
speed by using the inverter.
Fully open during cooling operation.
PI control is applied to keep the outlet superheated degree of subcooling heat exchanger
constant.
Used to switch the operation mode between cooling and heating.
Used to return oil from the accumulator to the compressor.
Used to control the amount of oil from the oil separator to the compressor.
In order to prevent the increase of high pressure when an error occurs, this switch is
activated at high pressure of 4.0 MPa (580 psi) or more to stop the compressor operation.
This valve opens at a pressure of 4.0 MPa (580 psi) for prevention of pressure increase,
thus resulting in no damage of functional parts due to the increase of pressure in
transportation or storage.
Used to detect outdoor air temperature, correct discharge pipe temperature, and others.
RXYQ144/168TATJU only
• Used for outdoor unit fan speed control.
• Used for inverter radiation fin temperature control.
• Used for pressure difference control.
Used to detect discharge pipe temperature, make the temperature protection control of
compressor, and others.
This detects temperature of liquid pipe between the air heat exchanger and main
electronic expansion valve. Used to make judgements on the recover or discharge
refrigerants to the refrigerant regulator.
This detects temperature of liquid pipe between the main electronic expansion valve and
subcooling heat exchanger.
This detects temperature of gas pipe on the evaporation side of subcooling heat
exchanger. Used to exercise the constant control of superheated degree at the outlet of
subcooling heat exchanger.
Used to detect liquid pipe temperature of air heat exchanger.
13 Refrigerant Circuit
SiUS341615E Refrigerant Circuit
(19)
C: 3D085568A
(24)
(27)
(3)
switch
(20)*
Heat
exchanger
M
M
Fan
Fan
Check valve
sensor
High pressure
(11)
(4)
Four way valve
S1NPH
(13)
Filter
Oil
separator
(7)
(21)
S1PH
High pressure
(1)
(9)
M1C
Compressor
SV
valve
Solenoid
(17)
tube
Capillary
(18)
valve
Electronic
expansion
(26)
(5)
Heat sink
valve
Electronic
expansion
Fusible
(6)
plug
(15)
valve
Pressure
regulating
Check valve
(12)
Filter
S1NPH
sensor
Low pressure
Oil
(14)
switch
High pressure
separator
S2PH
(22)
Filter Filter
(10)
(2)
Solenoid
valve
SV
M2C
Compressor
tube
Capillary
∗ The radiation fin thermistor (20) is located near the electrical component box.
port
Charge
Filter
tube
Capillary
(16)
Double tube
heat exchanger
Stop valve (With service port φ5/16 in. (7.9mm) flare connection)
Filter Filter
(23)
Accumulator
SV
(8)
valve
Solenoid
Filter
(25)
pipe
Liquid
Gas
pipe
Refrigerant Circuit 14
Refrigerant Circuit SiUS341615E
1.2 Indoor Unit
Symbol
No. in piping
diagram
(1)
Electronic expansion
valve
Name
(2) Suction air thermistor R1T R1T R1T (∗1) Used for thermostat control.
(3) Liquid pipe thermistor R2T R2T R2T
(4) Gas pipe thermistor R3T R3T R3T
(5) Discharge air thermistor — R4T — Used for discharge air temperature control.
∗1. R1T is for remote controller thermistor or optional remote sensor.
FXFQ-T, FXFQ-P, FXHQ-M FXZQ-M
Except
FXMQ-PB,
FXMQ-PB FXTQ-TA
FXTQ-TA
Y1E Y1E Y1E
Function
Used for gas superheated degree control while
in cooling or subcooled degree control while in
heating.
Used for gas superheated degree control while
in cooling or subcooled degree control while in
heating.
Used for gas superheated degree control while
in cooling.
Gas piping
connection port
(4)
Indoor heat exchanger
Fan
(3)
Filter Filter
(2)
(1)
Liquid piping
connection port
C: 4D024460M
FXUQ-P, FXEQ-P, FXMQ-M, FXAQ-P, FXLQ-M,
FXNQ-M
Gas piping
connection port
(4)
Indoor heat exchanger
Fan
(3)
(2)
Liquid piping
connection port
Indoor heat exchanger
(3)
Filter Filter
FXDQ-M
Gas piping connection port
Liquid piping connection port
Fan
(2)
(1)
(3)
Filter
(4)
(1)
(4)
Filter
(2)
Fan
Gas piping
connection port
Liquid piping
connection port
C: 4D040157B
Filter Filter
(1)
C: 4D034245P
Indoor heat exchanger
C: 4D043864N
15 Refrigerant Circuit
SiUS341615E Refrigerant Circuit
FXMQ-PB FXTQ-TA
Gas piping
(5)
(4)
connection port
Indoor heat exchanger
(3)
Filter Filter
Fan
(2)
(1)
Liquid piping
connection port
C: 4D034245P
(4)
(3)
(1)
C: 4D068194
Refrigerant Circuit 16
Refrigerant Circuit SiUS341615E
1.3 Outdoor-Air Processing Unit
Gas pipe
connection port
(5)
Heat exchanger
(7)
(6)
Filter
Capillary
tube
Solenoid
valve
Check
valve
Distributor
Fan
(4)
(1)
Filter
Electronic
expansion valve
No. in
piping
diagram
Electric
symbol
Name Function
(1) Y1E Electronic expansion valve
(2) Y1S Solenoid valve
(3) — Capillary tube
(3)
(2)
Filter
Used to control the flow rate of refrigerant, and make the
SH control (∗1) while in cooling.
Used to bypass hot gas while in heating with thermostat
OFF. Closed while in cooling.
Used to reduce pressure from high to low in bypassing hot
gas.
(4) R1T Suction air thermistor Used to turn ON or OFF the thermostat.
(5) R2T Liquid pipe thermistor
(6) R3T Gas pipe thermistor
Used to control the opening degree of electronic expansion
valve under the SC control (∗2).
Used to control the opening degree of electronic expansion
valve under the SH control.
Used to control the electronic expansion valve opening and
(7) R4T Discharge air thermistor
thermostat ON/OFF so as to keep the discharge air
temperature at the set temperature.
Liquid pipe
connection port
C: 4D018650D
Note: ∗1. SH control: Superheated control of heat exchanger outlet
∗2. SC control: Subcooling control of heat exchanger outlet
17 Refrigerant Circuit
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