Daikin VRV IV-S RXTQ-TAVJU Series User manual

Service
Manual
SiUS331604E
RXTQ36/48/60TAVJU
Heat Pump 60 Hz

SiUS331604E
iTable of Contents
RXTQ-TAVJU
Heat Pump
R-410A 60 Hz
ED Reference
For items below, please refer to Engineering Data.
No. Item ED No. Page Remarks
1 Specifications - Indoor Unit
EDUS391400-F14 2-4 FXFQ-T
EDUS391000-F1 2-3 FXFQ-P
EDUS391300-F9 2-3 FXZQ-M
EDUS391437-F15 3-4 FXUQ-P
EDUS391533-F16 3-5 FXEQ-P
EDUS39-600-F2 3-4 FXDQ-M
EDUS391503-F4 3-5 FXMQ-PB
EDUS39-900A-F11 3 FXMQ-M
EDUS39-600-F5 3 FXHQ-M
EDUS391100-F6 2-3 FXAQ-P
EDUS391502-F7 4-7 FXLQ-M, FXNQ-M
EDUS391000-F12 2-3 FXTQ-PA
2 Specifications - Outdoor Unit EDUS331608-R 2-4 RXTQ-T
3Specifications - Energy
Recovery Ventilator EDUS711116 2 VAM-G
4 Piping Diagrams - Indoor Unit
EDUS391400-F14 11 FXFQ-T
EDUS391000-F1 7 FXFQ-P
EDUS391300-F9 6 FXZQ-M
EDUS391437-F15 6 FXUQ-P
EDUS391533-F16 8 FXEQ-P
EDUS39-600-F2 8 FXDQ-M
EDUS391503-F4 11 FXMQ-PB
EDUS39-900A-F11 5 FXMQ-M
EDUS39-600-F5 7 FXHQ-M
EDUS391100-F6 7 FXAQ-P
EDUS391502-F7 14 FXLQ-M, FXNQ-M
EDUS391000-F12 6 FXTQ-PA
5Piping Diagrams - Outdoor
Unit EDUS331608-R 12-14 RXTQ-T

SiUS331604E
Table of Contents ii
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 Air Treatment Equipment ............................................................................. 2
1.3 Outdoor Unit ................................................................................................ 2
2. External Appearance...................................................................................3
2.1 Indoor Unit.................................................................................................... 3
2.2 Air Treatment Equipment ............................................................................. 4
2.3 Outdoor Unit ................................................................................................. 4
3. Capacity Range...........................................................................................5
3.1 Combination Ratio........................................................................................ 5
Part 2 Refrigerant Circuit ................................................................ 6
1. Refrigerant Circuit .......................................................................................7
1.1 RXTQ36TAVJU ............................................................................................ 7
1.2 RXTQ48TAVJU ............................................................................................ 9
1.3 RXTQ60TAVJU .......................................................................................... 11
2. Functional Parts Layout ............................................................................13
2.1 RXTQ36TAVJU .......................................................................................... 13
2.2 RXTQ48TAVJU .......................................................................................... 14
2.3 RXTQ60TAVJU .......................................................................................... 16
Part 3 Remote Controller ............................................................... 18
1. Applicable Models .....................................................................................19
6 Option List - Indoor Unit
EDUS391400-F14 43 FXFQ-T
EDUS391000-F1 40 FXFQ-P
EDUS391300-F9 48 FXZQ-M
EDUS391437-F15 36 FXUQ-P
EDUS391533-F16 27 FXEQ-P
EDUS39-600-F2 30 FXDQ-M
EDUS391503-F4 43 FXMQ-PB
EDUS39-900A-F11 25 FXMQ-M
EDUS39-600-F5 32 FXHQ-M
EDUS391100-F6 43 FXAQ-P
EDUS391502-F7 28 FXLQ-M, FXNQ-M
EDUS391000-F12 31 FXTQ-PA
7 Option List - Outdoor Unit EDUS331608-R 68 RXTQ-T
8Option List - Energy
Recovery Ventilator EDUS711116 49 VAM-G

SiUS331604E
iii Table of Contents
2. Names and Functions ...............................................................................20
2.1 BRC1E73 ................................................................................................... 20
2.2 Wireless Remote Controller ....................................................................... 22
3. MAIN/SUB Setting.....................................................................................23
3.1 BRC1E73 ................................................................................................... 23
3.2 Wireless Remote Controller ....................................................................... 24
4. Centralized Control Group No. Setting......................................................25
4.1 BRC1E73 ................................................................................................... 25
4.2 Wireless Remote Controller ....................................................................... 27
4.3 Group No. Setting Example........................................................................ 28
5. Service Mode ............................................................................................29
5.1 BRC1E73 ................................................................................................... 29
Part 4 Functions and Control......................................................... 31
1. Operation Mode ........................................................................................32
2. Basic Control.............................................................................................33
2.1 Normal Operation ....................................................................................... 33
2.2 Compressor PI Control............................................................................... 34
2.3 Electronic Expansion Valve PI Control....................................................... 35
2.4 Cooling Operation Fan Control................................................................... 36
3. Special Control..........................................................................................37
3.1 Startup Control ........................................................................................... 37
3.2 Oil Return Operation .................................................................................. 39
3.3 Defrost Operation ....................................................................................... 41
3.4 Pump down Residual Operation................................................................. 42
3.5 Restart Standby.......................................................................................... 43
3.6 Stopping Operation .................................................................................... 43
4. Protection Control .....................................................................................44
4.1 High Pressure Protection Control............................................................... 44
4.2 Low Pressure Protection Control................................................................ 46
4.3 Discharge Pipe Protection Control ............................................................. 47
4.4 Inverter Protection Control ......................................................................... 48
5. Other Control.............................................................................................50
5.1 Demand Operation ..................................................................................... 50
5.2 Heating Operation Prohibition .................................................................... 50
6. Outline of Control (Indoor Unit) .................................................................51
6.1 Operation Flow Chart ................................................................................. 51
6.2 Set Temperature and Control Temperature ............................................... 53
6.3 Thermostat Control..................................................................................... 55
6.4 Operations of Swing Flaps ......................................................................... 58
6.5 Hot Start Control (In Heating Operation Only)............................................ 59
6.6 Louver Control for Preventing Ceiling Dirt.................................................. 60
6.7 Drain Pump Control.................................................................................... 61
6.8 Electronic Expansion Valve Control ........................................................... 63
6.9 Freeze-up Prevention................................................................................. 64
6.10 Heater Control (Optional PCB KRP1B series is required.)......................... 66

SiUS331604E
Table of Contents iv
6.11 Heater Control (FXTQ) ............................................................................... 67
6.12 4 Step Thermostat Processing (FXTQ) ...................................................... 69
6.13 Interlocked with External Equipment (FXTQ) ............................................. 70
Part 5 Field Setting ........................................................................ 72
1. Test Operation ..........................................................................................73
1.1 Check Work Prior to Turning Power Supply ON ........................................ 73
1.2 Turn Power ON .......................................................................................... 73
1.3 Test Operation............................................................................................ 74
1.4 Error Codes and Corresponding Measures................................................ 77
1.5 When Turning ON Power First Time .......................................................... 79
1.6 When Turning ON Power the Second Time and Subsequent.................... 79
1.7 When an Indoor Unit or Outdoor Unit has been Added,
or Indoor or Outdoor Unit PCB has been Changed.................................... 79
2. Field Setting from Remote Controller........................................................80
2.1 Wired Remote Controller — BRC1E73 ...................................................... 80
2.2 Wireless Remote Controller ....................................................................... 82
2.3 Setting Contents and Code No. for Indoor Units ........................................ 83
2.4 Outdoor-Air Processing Unit - Field Setting (Remote Controller)............... 96
2.5 Field Setting of Operation Control Mode .................................................... 96
3. Field Setting from Outdoor Unit.................................................................99
3.1 Capacity Setting ......................................................................................... 99
3.2 Setting Mode and Monitor Mode .............................................................. 100
3.3 Setting Mode 1 ......................................................................................... 101
3.4 Setting Mode 2 ......................................................................................... 103
3.5 Monitor Mode ........................................................................................... 107
3.6 Setting of Low Noise Operation and Demand Operation ......................... 109
3.7 Setting of Refrigerant Recovery Mode ..................................................... 112
3.8 Setting of Vacuuming Mode ..................................................................... 112
3.9 Check Operation ...................................................................................... 113
3.10 Setting of Auxiliary Heater Control ........................................................... 114
3.11 Setting of Heat Pump Lockout and Emergency Heat Mode..................... 115
Part 6 Service Diagnosis.............................................................. 117
1. Servicing Items to be Confirmed .............................................................119
1.1 Troubleshooting........................................................................................ 119
1.2 Precautions for Maintenance.................................................................... 119
1.3 Refrigerant Properties (R-410A)............................................................... 120
2. Symptom-based Troubleshooting ...........................................................121
2.1 Indoor Unit Overall ................................................................................... 121
2.2 With the Optional Infrared Floor Sensor................................................... 124
3. Service Check Function ..........................................................................125
3.1 Wired Remote Controller.......................................................................... 125
3.2 Wireless Remote Controller ..................................................................... 127
3.3 Error Codes and Descriptions .................................................................. 129
3.4 Error Code Indication by Outdoor Unit PCB............................................. 131

SiUS331604E
vTable of Contents
4. Troubleshooting by Error Code ...............................................................135
4.1 External Protection Device Abnormality ................................................... 135
4.2 Indoor Unit PCB Abnormality ................................................................... 136
4.3 Drain Level Control System (S1L) Abnormality........................................ 137
4.4 Indoor Fan Motor (M1F) Lock, Overload .................................................. 139
4.5 Indoor Fan Motor Abnormality.................................................................. 142
4.6 Overload/Overcurrent/Indoor Fan Motor Lock.......................................... 146
4.7 Swing Flap Motor Abnormality ................................................................. 147
4.8 Power Supply Voltage Abnormality .......................................................... 149
4.9 Electronic Expansion Valve Coil Abnormality, Dust Clogging .................. 150
4.10 Drain Level Above Limit ........................................................................... 152
4.11 Capacity Determination Device Abnormality ............................................ 153
4.12 Transmission Abnormality (between Indoor Unit PCB and Fan PCB) ..... 154
4.13 Thermistor Abnormality ............................................................................ 156
4.14 Combination Abnormality (between Indoor Unit PCB and Fan PCB)....... 157
4.15 Remote Sensor Abnormality .................................................................... 158
4.16 Humidity Sensor System Abnormality ...................................................... 159
4.17 Infrared Presence/Floor Sensor Error ...................................................... 160
4.18 Remote Controller Thermistor Abnormality .............................................. 165
4.19 Outdoor Main PCB Abnormality ............................................................... 166
4.20 Activation of High Pressure Switch .......................................................... 167
4.21 Activation of Low Pressure Sensor .......................................................... 169
4.22 Inverter Compressor Motor Lock.............................................................. 171
4.23 Outdoor Fan Motor Abnormality ............................................................... 173
4.24 Electronic Expansion Valve Coil Abnormality........................................... 175
4.25 Discharge Pipe Temperature Abnormality ............................................... 177
4.26 Refrigerant Overcharged.......................................................................... 178
4.27 Thermistor Abnormality ............................................................................ 179
4.28 High Pressure Sensor Abnormality .......................................................... 180
4.29 Low Pressure Sensor Abnormality ........................................................... 181
4.30 PCB (for Inverter Compressor) Abnormality............................................. 182
4.31 Radiation Fin Temperature Rise Abnormality .......................................... 183
4.32 Inverter Compressor Instantaneous Overcurrent ..................................... 184
4.33 Inverter Compressor Overcurrent............................................................. 185
4.34 Inverter Compressor Startup Abnormality ................................................ 186
4.35 Transmission Error
(Between Microcomputers on the Outdoor Main PCB) ............................ 187
4.36 Inverter Circuit Capacitor High Voltage .................................................... 188
4.37 Radiation Fin Thermistor Abnormality ...................................................... 189
4.38 Refrigerant Shortage ................................................................................ 190
4.39 Power Supply Insufficient or Instantaneous Abnormality ......................... 192
4.40 Check Operation Not Executed................................................................ 194
4.41 Transmission Error between Indoor Units and Outdoor Units.................. 195
4.42 Transmission Error between Remote Controller and Indoor Unit............. 197
4.43 Transmission Error between Main and Sub Remote Controllers ............. 198
4.44 Transmission Error between Indoor and
Outdoor Units in the Same System .......................................................... 199

SiUS331604E
Table of Contents vi
4.45 Improper Combination of Indoor and
Outdoor Units, Indoor Units and Remote Controller................................. 200
4.46 Address Duplication of Centralized Controller.......................................... 202
4.47 Transmission Error between Centralized Controller and Indoor Unit....... 203
4.48 System not Set ......................................................................................... 206
4.49 System Abnormality, Refrigerant System Address Undefined ................. 207
4.50 Defective PCB .......................................................................................... 209
4.51 Transmission Error (between Centralized Controllers) ............................ 210
4.52 Poor Centralized Controller Combination................................................. 212
4.53 Address Duplication, Poor Setting............................................................ 214
4.54 The Operation Lamp Blinks...................................................................... 216
4.55 Central Control Indicator Lamp Blinks (One blink) ................................... 218
4.56 Central Control Indicator Lamp Blinks (Two blinks) ................................. 221
4.57 Check ....................................................................................................... 222
Part 7 Appendix............................................................................ 239
1. Wiring Diagrams......................................................................................240
1.1 Outdoor Unit ............................................................................................. 240
1.2 Indoor Unit................................................................................................ 243
1.3 Air Treatment Equipment ......................................................................... 255

Safety Cautions SiUS331604E
vii
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 well-
ventilated 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.
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.

SiUS331604E Safety Cautions
viii
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.
Warning
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.

Safety Cautions SiUS331604E
ix
1.2 Warnings and Cautions Regarding Safety of Users
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.
Caution
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.

SiUS331604E Safety Cautions
x
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.
Warning
Caution
Installation of a leakage breaker is necessary in some cases depending
on the conditions of the installation site, to prevent electrical shocks.

Safety Cautions SiUS331604E
xi
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 MΩor 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.
Caution

SiUS331604E Icons Used
xii
2. Icons Used
The following icons are used to attract the attention of the reader to specific information.
Icon Type of
Information
Description
Warning
Warning A warning is used when there is danger of personal injury.
Caution
Caution A caution is used when there is danger that the reader, through
incorrect manipulation, may damage equipment, lose data, get
an unexpected result or have to restart (part of) a procedure.
Note:
Note A note provides information that is not indispensable, but may
nevertheless be valuable to the reader, such as tips and tricks.
Reference A reference guides the reader to other places in this binder or in
this manual, where he/she will find additional information on a
specific topic.

SiUS331604E
1General Information
Part 1
General Information
1. Model Names of Indoor/Outdoor Units........................................................2
1.1 Indoor Unit.................................................................................................... 2
1.2 Air Treatment Equipment ............................................................................. 2
1.3 Outdoor Unit ................................................................................................ 2
2. External Appearance...................................................................................3
2.1 Indoor Unit.................................................................................................... 3
2.2 Air Treatment Equipment ............................................................................. 4
2.3 Outdoor Unit ................................................................................................. 4
3. Capacity Range...........................................................................................5
3.1 Combination Ratio........................................................................................ 5

SiUS331604E Model Names of Indoor/Outdoor Units
General Information 2
1. Model Names of Indoor/Outdoor Units
1.1 Indoor Unit
1.2 Air Treatment Equipment
Outdoor Air Processing Unit
Energy Recovery Ventilator (VAM series)
1.3 Outdoor Unit
Capacity Range 0.6 ton 0.8 ton 1 ton 1.25 ton 1.5 ton 2 ton 2.5 ton 3 ton 3.5 ton 4 ton 4.5 ton 6 ton
Power Supply,
Standard
Capacity Index 7.5 9.5 12 15 18 20 24 30 36 42 48 54 72
Ceiling Mounted Cassette
(Round Flow with Sensing) Type
FXFQ 07T 09T 12T 15T 18T — 24T 30T 36T — 48T — —
VJU
Ceiling Mounted Cassette
(Round Flow) Type FXFQ — 09P 12P — 18P — 24P 30P 36P — 48P — —
4 Way Ceiling Mounted
Cassette (2'×2') Type FXZQ07M09M12M15M18M————————VJU9
4-Way Blow Ceiling-Suspended Type FXUQ—————18P24P30P36P————
VJU
OneWayBlowCassetteTypeFXEQ07P09P12P15P18P—24P——————
Slim Ceiling Mounted Duct Type FXDQ07M09M12M—18M—24M——————
Ceiling Mounted Duct Type
(Middle and High Static Pressure)
FXMQ 07PB 09PB 12PB 15PB 18PB — 24PB 30PB 36PB — 48PB 54PB —
Ceiling Mounted Duct Type FXMQ — — — —————————72M
Ceiling Suspended Type FXHQ — — 12M — — — 24M — 36M ————
Wall Mounted Type FXAQ 07P 09P 12P — 18P — 24P — —————
Floor Standing Type FXLQ 07M 09M 12M — 18M — 24M — —————
Concealed Floor Standing Type FXNQ07M09M12M—18M—24M——————
Vertical Air Handling Unit FXTQ — — 12PA — 18PA — 24PA 30PA 36PA 42PA 48PA 54PA —
VJ : 1 phase, 208/230 V, 60 Hz
U(VJU) : Standard symbol
Series Model Name Power Supply,
Standard
FXMQ 48MF 72MF VJU
Series Model Name Power Supply,
Standard
Energy Recovery
Ventilator VAM 300G 470G 600G 1200G VJU
VJ : 1 phase, 208/230 V, 60 Hz
U(VJU) : Standard symbol
Capacity Range 3 ton 4 ton 5 ton Power Supply,
Standard
Capacity Index 36 48 57
Heat Pump RXTQ 36TA 48TA 60TA VJU
VJ : 1 phase, 208/230 V, 60 Hz
U(VJU) : Standard symbol

External Appearance SiUS331604E
3General Information
2. External Appearance
2.1 Indoor Unit
Ceiling mounted cassette (Round flow with sensing) type
FXFQ-T
Shown with BYCQ125B-W1
Ceiling mounted duct type
FXMQ-M
Ceiling mounted cassette (Round flow) type
FXFQ-P
Shown with BYCP125K-W1
Ceiling suspended type
FXHQ-M
4 way ceiling mounted cassette (2’×2’) type
FXZQ-M
Shown with BYFQ60B3W1
Wall mounted type
FXAQ-P
4-way blow ceiling-suspended
type
FXUQ-P
Floor standing type
FXLQ-M
One way blow cassette type
FXEQ-P
Concealed floor standing type
FXNQ-M
Slim ceiling mounted duct type
FXDQ-M
Vertical air handling unit
FXTQ-PA
Ceiling mounted duct type (Middle and high static pressure)
FXMQ-PB

SiUS331604E External Appearance
General Information 4
2.2 Air Treatment Equipment
2.3 Outdoor Unit
Outdoor air processing unit
FXMQ-MF
Energy recovery ventilator
(VAM series)
VAM-G
RXTQ60TAVJU
RXTQ36TAVJU, RXTQ48TAVJU
3/4 ton 5 ton

Capacity Range SiUS331604E
5General Information
3. Capacity Range
3.1 Combination Ratio
Outdoor Unit
Combination ratio = Total capacity index of the indoor units
Capacity index of the outdoor units
Type Min. combination ratio
Max. combination ratio
Types of connected indoor units
VRV indoor units
Single outdoor units 50% 130%
Model Name RXTQ36TAVJU RXTQ48TAVJU RXTQ60TAVJU
Capacity Range 3 ton 4 ton 5 ton
Capacity Index 36 48 57
Max. Number of
Connectable
Indoor Units
689
Total Capacity
Index of Indoor
Units to be
Connected
18
~
46
24
~
62
28.5
~
74

SiUS331604E
Refrigerant Circuit 6
Part 2
Refrigerant Circuit
1. Refrigerant Circuit .......................................................................................7
1.1 RXTQ36TAVJU ............................................................................................ 7
1.2 RXTQ48TAVJU ............................................................................................ 9
1.3 RXTQ60TAVJU .......................................................................................... 11
2. Functional Parts Layout ............................................................................13
2.1 RXTQ36TAVJU .......................................................................................... 13
2.2 RXTQ48TAVJU .......................................................................................... 14
2.3 RXTQ60TAVJU .......................................................................................... 16

Refrigerant Circuit SiUS331604E
7Refrigerant Circuit
1. Refrigerant Circuit
1.1 RXTQ36TAVJU
No. in
piping
diagram
Symbol Name Function
(1) M1C Inverter compressor Inverter compressor is operated on frequencies between 36 Hz and 195 Hz by using the
inverter.
(2) M1F Inverter fan Because the system is of an air heat exchange type, the fan is operated at 8-step rotation
speed by using the inverter.
(3) Y1E Electronic expansion valve
(Main)
While in heating operation, PI control is applied to keep the outlet superheated degree of
air heat exchanger constant.
(4) Y1S Four way valve Used to switch the operation mode between cooling and heating.
(5) Y2S Solenoid valve (Hot gas) Used to prevent the low pressure from transient falling.
(6) Y3S Solenoid valve (Unload circuit) Used for unloading operation of compressor.
(7) S1NPH High pressure sensor Used to detect high pressure.
(8) S1NPL Low pressure sensor Used to detect low pressure.
(9) S1PH High pressure switch 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.
(10) — Fusible plug
In order to prevent the increase of pressure when abnormal heating is caused by fire or
others, the fusible part of the plug is molten at a temperature of 70 ~ 75°C (158 ~ 167°F) to
release the pressure into the atmosphere.
(11) — Pressure regulating valve
(Receiver to discharge pipe)
This valve opens at a pressure of 4.0 MPa (580 psi) or more for prevention of pressure
increase, thus resulting in no damage of functional parts due to the increase of pressure in
transportation or storage.
(12) R1T Thermistor (Outdoor air) Used to detect outdoor air temperature, correct discharge pipe temperature, and others.
(13) R2T Thermistor (Discharge pipe) Used to detect discharge pipe temperature, make the temperature protection control of
compressor, and others.
(14) R3T Thermistor (Suction pipe 1) Used to detect suction pipe temperature, keep the suction superheated degree constant in
heating operation, and others.
(15) R4T Thermistor (Heat exchanger
deicer)
Used to detect liquid pipe temperature of air heat exchanger, determine defrost operation,
and others.
(16) R5T Thermistor (Suction pipe 2) Used for calculation of internal temperature of compressor etc.
(17) R7T Thermistor (Liquid pipe) Used to detect refrigerant overcharge in check operation, and others.
(18) R10T Thermistor (Radiation fin)
• Used for outdoor unit fan speed control.
• Used for inverter radiation fin temperature control.
• Used for pressure difference control.