LG LT-E2460FL User manual

Ceiling Cassette
Air Conditioner
SERVICE MANUAL
MODELS: LT-E2460FL/LT-E2460FA
LT-E2460RL/LT-E2460RA

Contents
Functions .................................................................................................................................3
Product Specifications (Cooling)............................................................................................5
Dimensions ..............................................................................................................................6
Refrigeration Cycle Diagram ..................................................................................................8
Wiring Diagram ........................................................................................................................9
Operation Details ...................................................................................................................10
Installation of Indoor, Outdoor Unit .....................................................................................13
2-way Valve, 3-way Valve ......................................................................................................28
Cycle Troubleshooting Guide ...............................................................................................33
Electronic Parts Troubleshooting Guide .............................................................................34
Electronic Control Device .....................................................................................................37
Schematic Diagram ...............................................................................................................38
Exploded View and Replacement Parts List .......................................................................39
–2–

Functions
Indoor Unit
Operation ON/OFF by Remote controller
Sensing the Room Temperature
Room temperature control
Starting Current Control
Time Delay Safety Control
Indoor Fan Speed Control
Soft Dry Operation Mode
Airflow Direction Control
Auto Operation(Auto Change Over)
Auto Restart
–3–
Compact and light design • To install a unit is very convenient size because of smaller
than fextile size. ( 600 x 600 )
Low noise • The most advanced low-noise design.
• The adoption of turbo fan and round type heat exchanger
give the quietest operation.
Long life filter • Long life type(wrinkle) and wastable and anti-bacteria filter
is adopted.
Plasma Air Purifying Filter(FA/RA only)
High head height Drain pump • Built-in drain pump automatically drains water.
• A standard drain-head height of up to 700mm is possible.
High-Ceilingcorresponding Function • According to the height of ceiling, the RPM of indoor fan
motor is selectable to increase air reaching distance.
Central Control(Optional) •
It is operating individually or totally by central control function.
Group Control(Optional Wiring) •
Each controller can control 16 units and 8 controllers can connect.
•
It operates maximum 16 units by only one wired remote con-
troller and each unit starts random to prevent overcurrent.
• Room temperature sensor. (Thermistor)
• Maintains the room temperature in accordance with the Setting Temp.
• Indoor fan is delayed for 5 seconds at the starting.
• Restarting is inhibited for approx. 3 minutes.
• Po, High, Med, Low
• Intermittent operation of fan at low speed.
• The louver can be set at swing up and down automatically.
• Although the air-conditioner is turned off by a power failure, it is restarted automati-
cally previous operation mode after power supply.
• The setting temperature and desired operation mode are auto-
matically set by fuzzy rule.

–4–
Remote Controller
Operation ON/OFF
Operation Mode Selection
Fan Speed Selection
Room Temperature Display
Temperature Setting
Setting the Timer
Weekly Program
(Cooling
model only) (Heating
model only)
(Low) (Med) (High)
Cooling Operation Mode ( )
Heating Operation Mode ( ) Auto Operation Mode ( )
Soft Dry Operation Mode ( )
Fan Operation Mode
HI Po AUTOMEDLO
Program Holiday
SET/CLR
MinHour
Week
Timer CancelTimer Cancel
: High:39°C ↔LOW:11°C
: Fan Operates without cooling & heating
Cooling Heating
Down to 18°C
Up to 30°CDown to 16°C Up to 30°C

Model
1, 220-240, 50 1, 220-240, 50
--
23,300 23,300
--
- 23,500
2,400 2,600
--
11.2 12
--
2.19 -
--
15 15
50 50
1.9 -
OO
XO
44
OO
OO
OO
OO
OO
44
OO
XO
OO
OO
OO
OO
Optional Optional
OO
X / O X / O
1,480 1,560
570 x 570 x 269 570 x 570 x 269
670 x 670 x 30 670 x 670 x 30
870 x 655 x 320 870 x 655 x 320
20 20
60 60
14 : 3*2.5 14 : 3*2.5
18 : 4*0.75 18 : 4*0.75
1/4 (6.35mm) 1/4 (6.35mm)
1/2 (12.7mm) 1/2 (12.7mm)
30 -
30 -
Foam PE/5mm Foam PE/5mm
Ø25/32 Ø25/32
LT-E2460FL/FA LT-E2460RL/RA
Power Supply ø, V, Hz
Capacity Cooling kcal/h(W)
Btu/h
Heating kcal/h(W)
Btu/h
Input Cooling W
Heating W
Running Current Cooling A
Heating A
E. E. R kcal/h(W)
C.O.P W/W
Air Circulation Indoor m3/min
Outdoor m3/min
Moisture Removal l/ h
Air-Flow Direction Control
Heating Operation Mode
Fan Speeds (steps)
Auto Operation (Changeover)
Forced Operation
Jet Cool
Soft Dry Operation
Timer Delay Safety Function
Feature Air Deflection (Way)
Self Diagnosis
Hot start
Auto Restart
Air refresh (Hole)
High Ceiling
Group Control (Optional wiring)
Central Control
Wired remote controller (with weekly Program)
Plasma A/Cleaner
Refrigerant(R-410A) Charge g
Dimensions Indoor mm
(W x D x H) Panel mm
Outdoor mm
Net Weight Indoor kg
Outdoor kg
Main Power Cord AWG#:P*mm2
Connection Cable AWG#:P*mm2
Service Valve Liquid (inch)
Gas (inch)
Installation Pipe Max. Length (m)
Max. Elevation (m)
Insulation(material/thickness)
Drain Hose(I.D/O.D) mm
Product Specifications (Cooling)
–5–

Dimensions
–6–
269
67055
570
269
190.5
160
52
90 90
120.4 30 521
670
570
450
40
110 110
670
670
CLOSE OPEN OPEN CLOSE
(1) Indoor Unit
• Model : LT-E2460FL/FA, LT-E2460RL/FL

(2) Outdoor Unit
–7–
Gas side
3-way valve
Liquid side
W
L6L7 L8 L9
L4
L11
L10
D
L1
L2
L5 L3
MODEL
DIM
W mm 870
H mm 655
D mm 320
L1 mm 370
L2 mm 25
L3 mm 340
L4 mm 630
L5 mm 25
L6 mm 546
L7 mm 162
L8 mm 162
L9 mm 54
L10 mm 74.5
L11 mm 79
LT-E2460FL/FA
LT-E2460RL/RA

Refrigeration Cycle Diagram
• COOLING ONLY
• HEAT PUMP
–8–
INDOOR UNIT
H/EX
Liquid SideLiquid Side
COMPRESSOR
H/EX
Gas SideGas SideGas Side
CAPI
CAPI
OUTDOOR UNIT
24K
INDOOR UNIT
24K
H/EX Liquid SideGas Side
COMPRESSOR
VALVE REVERSING
H/EX
Gas SideLiquid Side
CAPI
CAPI
Heating Cooling
OUTDOOR UNIT
Capacity
24K 1/4" 1/2"
7. 530
GAS LIQUID
515 30
Elevation (m)
Length (m) * Additional
refrigerant
(g/m)
Pipe Size
Rated Rated
Max. Max.
•Rated performance for refrigerant line length of: 7.5m
•If 24K Capacity is installed at a distance of 15m, 225g of refrigerant
should be added ....................................................(15-7.5)x30g

–9–
Wiring Diagram
•COOLING ONLY
Models : LT-E2460FL/FA
•HEAT PUMP
Models : LT-E2460RL/RA
INDOOR WIRING DIAGRAM
INDOOR
MOTOR DRAIN
PUMP
TEMP.
THERMISTOR
PIPE
THERMISTOR
REMOTE
CONTROL
FLOAT S/W
CN -DISP
DISPLAY PCB
(OPTION)
AIR
CLEANER
H.V. ASSY
DOOR S/W
TERMINAL
BLOCK
TO OUTDOOR UNIT
3854A30086Z
BR
YL
BK
OR
BL
BL
BR
GN/YL
RD
BL
COMP
RD
BK
WH
RD
BK
3(L)4(N)5 6 7
FUSE T3.15A
STEP
MOTOR
8
OUTDOOR WIRING DIAGRAM
INDOOR WIRING DIAGRAM
OUTDOOR WIRING DIAGRAM
COMP
R
SH
4
28 61 0
CF
BL YL
OR
BK
TB2
TB1
BR
BR
BR
BR
BL
BL
BL BL
BL
GN/YL GN/YL
BK
BK
BK
BK
RD
CAPACITOR
RD
C
POWER
RELAY
FAN
MOTOR
FUSE 5A
FUSE 5A
POWER
INPUT TO INDOOR UNIT
OUTDOOR TH
TERMINAL
BLOCK
Low Ambient PCB
3854A30079E
1(L)2(N)3(L)4(N) 5678
1
2
3
4
5
6
7
8
9
BL
COMP
R
SH
4
28 61 0
C
BL
BL
BL
WH
BL
BL
BR
RD
BR BR
BR
GN/YL
GN/YL
CAPACITOR
REVERSING
VALVE
RD
BR
RD
BK
OR
TB
OR
YL
BK
TB
WH
BK
C
POWER
RELAY
FAN
MOTOR
FUSE 5A
FUSE 5A
POWER
INPUT
TO INDOOR UNIT
TERMINAL
BLOCK
3854A20077U
1(L)2(N)3(L)4(N) 5678
1
2
3
4
5
6
7
8
9
Low Ambient PCB
OUTDOOR TH
TNS NO
L1
L2
L3 L4
D.P
NC NO NC
pipe TH
INDOOR
MOTOR DRAIN
PUMP
PIPE
THERMISTOR
REMOTE
CONTROL
FLOAT S/W
CN -DISP
DISPLAY PCB
(
OPTION
)
AIR
CLEANER
H.V. ASSY
DOOR S/W
TERMINAL
BLOCK
TO OUTDOOR UNIT
3854A20126K
BR
YL
BK
OR
BL
BL
BR
GN/YL
RD
BK
BL
GN
/
YL
COMP
4 WAY
RD
BK
WH
RD
BK
3(L)4(N)5 6 7
FUSE T3.15A
STEP
MOTOR
TEMP.
THERMISTOR

–10–
Operation Details
(1) The function of main control
1. Time Delay Safety Control
•3min The compressor is ceased for 3minutes to balance the pressure in the refrigeration cycle.
(Protection of compressor)
•5sec Vertical louvers are delayed for 5 secs to be opened to prevent the frictional sound between louver and air flow.
•30sec The 4-way valve is ceased for 30sec. to prevent abnormal noise when the Heating operation is OFF or
switched to the other operation mode while compress is off.
While compressor is running, it takes 3~5 seconds to switch.
2. Auto Swing Control
•This function is to swing the louver up and down automatically.
3. Air-Filter Checking Control
•'Filter' sign will appear on the remote controller display and main body display when an air-filter is polluted. Then
clean the air-filter referring to Owners Manual.
4. Soft-Dry Operation
•The indoor fan speed is automatically set to the low, and fan speed control is not available because of already
being set to the best speed for Dry Operation by Micom Control.
5. Cooling Mode Operation
•When selecting the Cooling( ) Mode Operation, the unit will operate according to the setting by the remote con-
troller and the operation diagram is as follows.
Intake Air temp.
SET TEMP.+0.5°C
(COMP. ON)
SET TEMP
SET TEMP. -0.5°C
(COMP. OFF)
Selected Selected Selected
fan speed fan speed fan speed
COMPRESSOR ON OFF ON OFF ON
INDOOR FAN Low Low
More than
3 minutes
More than
3 minutes

–11–
Intake Air temp.
Setting temp.+3°C
(Compressor OFF)
Setting temp.
(Compressor ON)
INDOOR FAN
COMPRESSOR ON OFF ON OFF
A point; While the indoor Heat-Exchanger temperature is higher than 40°C fan operates at low speed, when
it becomes lower than 40˚C fan stops.
B point; When the indoor Heat-Exchanger temperature is higher than 42°C, fan operates at selected fan
speed, when it becomes lower than 39°C, the fan operates at low speed.
6. Heating Mode Operation
The unit will operate according to the setting by the remote controller and the operation diagram is shown as follows.
(Hot Start)
Low
OFF
Selected
Fan Speed
minimum 3min
Selecting fan
speed
LowLowLow OFF OFF
minimum
10sec.
1min
AA
minimum
1min.
minimum
10sec.
B
7. Hot-Start Control
•The indoor fan stops until the evaporator piping temperature reaches to 25°C.
•If the evaporator piping temperature drops below 22°C, indoor fan stops again.
•The operation diagram is as follows.
PIPING
TEMPERATURE 1min
COMPRESSOR
INDOOR FAN
ON
OFF LOW Selected
fan speed
22°C
25°C

–12–
8. Defrost Control
•Defrost control is available 45 minutes later since heating mode operation started, and it will not prolong over
10 minutes.
•Defrost control is carried out when the outdoor pipe temp. falls below -6°C for more than 3 minutes after 45
minutes passed from starting of heating operation.
•Defrost ends after 10 minutes passed from starting of defrost operation or when the outdoor pipe temp. rises
over 12°C after 5 minutes passed from starting of defrost.
More than 45 minutes
of heating operation Within
9min. 45sec.
ON OFF
ON
ON
ON OFF
COMPRESSOR
4-WAY VALVE
INDOOR FAN
-6°C ON
12°C OFF
The outdoor
piping Temp. More than 10 min.
running of compressor
More than 45 minutes
of heating operation
HOT-
START
ON
■Defrost Control (New Type Defrost Control)
•While in heating mode operation in order to protect the evaporator pipe of the outdoor unit from freezing, reversed to
cooling cycle to defrost the evaporator pipe of the outdoor unit.
•Defrost control is available 45 min. later since heating mode operation started, and it will not prolong over 10 min.
•Defrost control is carried out according to the following priority order while in heating mode operation.
1st priority : Defrost control is carried out according to the indoor pipe temp 60 min. later since heating mode opera-
tion started.
2nd priority : The temp differences between the indoor pipe temp and the intake air temp 25 min. later(∆T1) and 45
min. later (∆T2) since heating mode operation started are measured, then defrost control is carried out
according to the dirrerence (∆T=∆T1-∆T2)
3rd priority : Defrost control is carried out according to the temp difference (E=TE1-TE2) between the indoor pipe
temperatures of 25 min later(TE1) and 45 min later (TE2) after heating mode operation started.
•When the indoor pipe temp is 41°C or above, defrost control is not carried out even if the condition is one of the
defrost conditions above.
•While in defrost control, the compressor is on and the indoor fan, the outdoor fan, and the 4 way valve are off.
9. Self-diagnosis Function
•'CHECK' will flash in the remote controller display when a problem occurs.
•Correct the 'FAULT MESSAGES' as shown in the table below before restarting operation.
•During the normal operation 'CHECK' won't be displayed in the remote controller.
Remote controller LCD FAULT MESSAGES
CH 01 Indoor room temperature thermistor error
CH 02 Indoor piping thermistor error
CH 03 Indoor main body / Remote controller unit communication error
CH 04 Water level float switch error

–13–
Installation of Indoor, Outdoor Unit
1. Selection of the best location
1) Indoor unit
•There should not be any heat source or steam
near the unit.
•There should not be any obstacles to prevent the
air circulation.
•A place where air circulation in the room will be
good.
•A place where drainage can be easily obtained.
•A place where noise prevention is taken into con-
sideration.
•Do not install the unit near the door way.
•Ensure the spaces indicated by arrows from the
wall, ceiling, or other obstacles.
•The indoor unit must keep the maintenance
space.
2) Outdoor unit
•If an awning is built over the unit to prevent direct
sunlight or rain exposure, be careful that heat
radiation from the condenser is not restricted.
•There should not be any animals or plants which
could be affected by hot air discharged.
•Ensure the spaces indicated by arrows from the
wall, ceiling, fence or other obstacles.
3) Piping length and the elevation
More than
30cm
Sunroof
Fence or
obstacles
More than 70cm
More than 50cm
More than
More than
30cm
More than
30cm
Indoor unit
Outdoor unit
B
A
Unit:cm
Ceiling
Ceiling Board Ceiling Board
30 or more
Above 250 330 or less
100 or more
50 or
more
50 or
more
30 or less
Floor
CAPACITY
GAS LIQUID
24K Btu/h 1/4" 1/2" 7. 53051530
Elevation (m)
Length (m) * Additional
refrigerant
(g/m)
Pipe Size
Rated Rated
Max. Max.
•Rated performance for refrigerant line length of: 7.5m

–14–
NOTE:
•Thoroughly study the following installation locations:
1. In such places as restaurants and kitchens, considerable amount of oil steam and flour adhere to the turbo
fan, the fin of the heat exchanger and the drain pump, resulting in heat exchange reduction, spraying, dispers-
ing of water drops, drain pump malfunction, etc.
In these cases, take the following actions:
•Make sure that the ventilation fan for smoke-collecting hood on a cooking table has sufficient capacity so
that it draws oily steam which should not flow into the suction of the air conditioner.
•Make enough distance from a cooking room to install the air conditioner in such a place where it may not
suck in oily steam.
2. Avoid installing air conditioner in such circumstances where cutting oil mist or iron powder is in suspension in
factories, etc.
3. Avoid places where inflammable gas is generated, flows in, is stored or vented.
4. Avoid places where sulfurous acid gas or corrosive gas is generated.
5. Avoid places near high frequency generators.
2. Ceiling opening dimensions and hanging bolt location
•The dimensions of the paper model for installing are the same as those of the ceiling opening dimensions.
•Select and mark the position for fixing bolts and piping hole.
•Decide the position for fixing bolts slightly tilted to the drain
direction after considering the direction of drain hose.
•Drill the hole for anchor bolt on the wall.
•This air-conditioner uses a drain pump.
•Horizontly install the unit using a level gauge.
•During the installation, care should be taken not to
damage electric wires.
CAUTION
Level gauge
Ceiling
Unit:mm
570 Unit size
570 Unit size
450 (Hanging bolt)
7575
600 (Ceiling opening)
600 (Ceiling opening)
521(Hanging bolt) 39.5
39.5
Ceiling board
Use the ventilation fan
for smoke-collecting
hood with sufficient
capacity.
Cooking table
Air conditioner
Take enough
distance
24K

–15–
Wall
5~7mm
Indoor Outdoor
Set screw of
paper model (4 pieces)
Paper model
for installation
Ceiling board
150mm
Adjust the same height
Ceiling board
Ceiling
Flat washer for M10
(accessory)
Keep the length of the bolt
from the bracket to 40mm
Open the ceiling board
along the outer edge of the
paper model
Flat washer for M10
(accessory)
Hanging bolt
(W3/8 or M10)
Nut
(W3/8 or M10)
Nut
(W3/8 or M10)
Spring washer
(M10)
Air Conditioner body
3. The Indoor Unit Installation
•The following parts is option.
Hanging Bolt - W 3/8 or M10
Nut - W 3/8 or M10
Spring Washer - M10
Plate Washer - M10
•Drill the piping hole on the wall slightly tilted to the
outdoor side using a Ø70 hole-core drill.
•Tighten the nut and bolt to prevent unit falling.
CAUTION
4. Remote Controller Installation
•Although the room temperature sensor is in the indoor unit, the remote controller should be installed
in such places away from direct sunlight and high humidity.
Installation of the remote controller
•Select places that are not splashed with water.
•Select control position after receiving customer approval.
•The room temperature sensor is built in the indoor unit.
•This remote controller equipped with liquid crystal display. If this position is higher or lower, display is difficult
to see.(The standard height is 1.2 ~ 1.5m high)
Routing of the remote controller cord
•Keep the remote controller cord away from the refrigerant piping and the drain piping.
•To protect the remote controller cord from electrical noise, place the cord at least 5cm away from other power
cables (audio equipment, television set, etc.)
•If the remote controller cord is secured to the wall, provide a trap at the top of the cord to prevent water
droplets from running.

–16–
Remote control
box body
Cord clamp
(accessory)
Lever carefully
the box open
using a screw
driver, etc.
Front case
The lower part
Face of wall
Under plate
Screw (accessory)
Remove the battery cover from the remote con-
troller.
•Slide the cover according to the arrow direction.
Insert the two batteries.
•Be sure that the (+) and (-) directions are correct.
•Be sure that both batteries are new.
Re-attach the cover.
•Slide it back into position.
•Fix the under plate on the wall
•Separate the under plate from Remote control box.
•Fix the cord clamps on the wall by ø3 tapping
screws (accessory).
•Fix the remote control cord.
WIRED REMOTE CONTROL INSTALLATION
REMOTE CONTROL PREPARATION(OPTIONAL)
DISASSEMBLING
ELECTRICAL WIRING
HOW TO MOUNT ONTO A WALL
HOW TO INSERT BATTERIES
Wire and make sure that teminal
numbers are matched on unit side and
remote controller side.
The maximum length of the cord is 100m.
If the length of the cord exceeds 50m,
use a wire size greater than 0.5mm2.
Remote controller
(Main board)
CN REMO
•Do not use rechargeable batteries,
such batteries differ from standard dry
cells in shape, dimensions, and per-
formance.
•Romove the batteries from the remote
controller if the air conditioner is not
going to be used for some long time.
HOW TO INSERT BATTERIES

–17–
[Air inlet side view]
The power cord connected to the outdoor unit should be complied
with the following specifications (Rubber insulation, type H05RN-F
approved by HAR or SAA).
If the supply cord is damaged, it must be replaced by a special cord or assembly available from the manufacturer or its service agent.
The connecting cable connected to the indoor and outdoor unit should
be complied with the following specifications (Rubber insulation,
type H05RN-F approved by HAR or SAA).
CAUTION
8.5mm
20mm
GN/YL
7.5mm
20mm
GN/YL
NORMAL
CROSS-SECTIONAL
AREA 0.75mm2
NORMAL
CROSS-SECTIONAL
AREA 2.5mm2(24K)
Control box cover
Indoor
power cord
Remote
controller
cord Control box cover
fitting screw(2 units)
Terminal Block of Indoor Unit
3(L) 4(N) 567 1(L) 2(N) 3(L) 4(N) 5678
Terminal Block of Outdoor Unit
Power Cord
Terminal Block of Indoor Unit
3(L) 4(N) 567 1(L) 2(N) 3(L) 4(N) 5678
Terminal Block of Outdoor Unit
Power Cord
5. Wiring Connection
•Open the control box cover and connect the Remote controller cord and Indoor power wires.
Make sure that the screws of the terminal are free from looseness.
WARNING
•24K, 1 Phase
Cooling Model
•24K, 1 Phase
Heat Pump

–18–
1. All wiring must comply with LOCAL REGULATIONS.
2. Select a power source that is capable of supplying the current required by the air conditioner.
3. Feed the power source to the unit via a distribution switch board designed for this purpose.
4. The terminal screws inside the control box may be loose due to vibration during transport.
Check the screws for loose connection.
(Running the air conditioner with loose connection can overload and damage electrical components.)
5. Always ground the air conditioner with a grounding wire and connector to meet the LOCAL REGULATION.
Main power source
Switch box
Refrigerant pipe
Circuit Breaker
Use circuit breaker or time delay fuse.
ELECTRICAL WIRING
CONNECTING THE CABLE TO OUTDOOR UNIT
1. Remove the Cover control from the unit by loosening a
screw.
Connect the wires to the terminals on the control
board individually as following.
2. Secure the cable onto the control board with the hold-
er (clamper).
3. Refix the cover control to the original position with the
screw.
4. Use a recongnized adequate circuit breaker between
the power source and the unit. A disconnection device
to adequately disconnect all supply lines must be fit-
ted.
Outdoor unit
Terminal block
Connecting
cable
Cover control Holder for
connecting
cable
Over 5mm
Holder for
power supply
cord Power supply
cord

–19–
•Preparation of Piping
6. Connecting Pipes to the Indoor Unit
Main cause of gas leakage is defect in flaring work. Carry out correct flaring work in the following procedure.
1) Cut the pipes and the cable.
■Use the accessory piping kit or the pipes purchased
locally.
■Measure the distance between the indoor and the out-
door unit.
■Cut the pipes a little longer than measured distance.
■Cut the cable 1.5m longer than the pipe length.
2) Burrs removal
■Completely remove all burrs from the cut cross section
of pipe/tube.
■Put the end of the copper tube/pipe to downward direc-
tion as you remove burrs in order to avoid to let burrs
drop in the tubing.
3) Putting nut on
■Remove flare nuts attached to indoor and outdoor units,
than put them on pipe/tube having completed burr
removal.
(Not possible to put them on after flaring work)
4) Flaring work
■Carry out flaring work using flaring tool as shown below.
Firmly hold copper tube in a bar(or die) as indicated
dimension in the table above.
5) Check
■Compare the flared work with figure below.
■If flare is noted to be defective, cut off the flared section
and do flaring work again.
Outside diameter A
mm inch mm
Ø6.35 3/8 0.5~0.8
Ø9.52 3/8 0.5~0.8
Ø12.7 1/2 0.5~0.8
Ø15.88 5/8 0.8~1.0
Ø19.05 3/4 1.0~1.3
Copper
tube
90°Slanted Uneven Rough
Pipe Reamer
Point down
Flare nut
Copper tube
Bar
Copper pipe
Clamp handle Red arrow mark
Cone
Yoke
Handle
Bar
"A"
Inclined
Inside is shining without scratches
Smooth all round
Even length
all round
Surface
damaged Cracked Uneven thickness
= Improper flaring =

–20–
1. Form the piping according to its routing. Avoid bend-
ing and bending back the same piping point more
than three times. (This will result in hardening the
pipe.)
2. After deforming the piping, align centers of the union
fitting of the indoor unit and the piping, and tighten
them firmly with wrenches.
3. Connect pipe to the service valve or ball valve which
is located below the outdoor unit.
4. After completing the piping connection, be sure to
check if there is gas leakage in indoor and outdoor
connection.
After completing the piping connection, execute vacuum
drying for the connecting piping and the indoor unit.
The vacuum drying must be carried out using the ser-
vice ports of both the liquid and gas side valves.
Use two wrenches and tighten with regular torque.
Outdoor
unit
Liquid side
Flare connection
Flare connection
Gas side
Indoor
unit
Union
Flare nut fastening torque
Ø6.35mm 1.8kg.m
Ø9.52mm 4.0kg.m
Ø12.7mm 5.5kg.m
Ø15.88mm 6.6kg.m
Ø19.05mm 6.6kg.m
Model Liquid side piping Gas side piping
24K Btu/h Ø6.35mm Ø12.7mm
Piping Connection
Vacuum drying
CAUTION