Order No: PAPAMY1204086CE
Indoor Unit Outdoor Unit
CS-S18NKUA
CS-S24NKUA
CU-S18NKUA
CU-S24NKUA
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to
service or repair the products dealt with in this service information by anyone else could result in serious injury or death.
PRECAUTION OF LOW TEMPERATURE
In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit.
WARNING
TABLE OF CONTENTS
1. Safety Precautions.............................................3
2. Specification .......................................................5
3. Location of Controls and Components ...........7
3.1 Indoor Unit....................................................7
3.2 Outdoor Unit.................................................7
3.3 Remote Control ............................................7
4. Dimensions.........................................................8
4.1 Indoor Unit....................................................8
4.2 Outdoor Unit.................................................9
5. Refrigeration Cycle Diagram........................... 10
6. Block Diagram ..................................................11
7. Wiring Connection Diagram............................12
7.1 Indoor Unit..................................................12
7.2 Outdoor Unit...............................................13
8. Electronic Circuit Diagram ..............................14
8.1 Indoor Unit..................................................14
8.2 Outdoor Unit...............................................15
9. Printed Circuit Board ....................................... 16
9.1 Indoor Unit..................................................16
9.2 Outdoor Unit ...............................................18
10. Installation Instruction.....................................19
11. Operation Control.............................................27
11.1 Basic Function............................................27
11.2 Indoor Fan Motor Operation.......................28
11.3 Outdoor Fan Motor Operation ....................28
11.4 Airflow Direction .........................................28
11.5 Quiet Operation (Cooling Mode/Cooling Area
of Dry Mode)...............................................29
11.6 Powerful Mode Operation ..........................30
11.7 Timer Control..............................................30
11.8 Random Auto Restart Control ....................30
11.9 Indication Panel..........................................31
12. Protection Control............................................32
12.1 Restart Control (Time Delay Safety Control) .
....................................................................32
12.2 30 Seconds Forced Operation ...................32
12.3 Total Running Current Control ...................32
© Panasonic Appliances Air-Conditioning Malaysia
Sdn. Bhd. 2012. Unauthorized copying and distribution
is a violation of law.
12.4
IPM (Power Transistor) Prevention Control ...
....................................................................32
12.5 Compressor Overheating Prevention Control
....................................................................33
12.6 Low Pressure Protection Control (Gas
Leakage Detection) ....................................33
12.7 Low Frequency Protection Control 1 ..........33
12.8 Low Frequency Protection Control 2 ..........33
12.9 Outdoor Air Temperature Control...............33
12.10 Cooling Overload Control ...........................34
12.11 Freeze Prevention Control .........................34
12.12 Freeze Prevention Control 2 ......................34
12.13 Dew Prevention Control .............................34
13. Servicing Mode .................................................35
13.1 Auto Off/On Button .....................................35
13.2 Remote Control Button...............................36
14. Troubleshooting Guide....................................37
14.1 Refrigeration Cycle System........................37
14.2 Breakdown Self Diagnosis Function...........39
14.3 Error Code Table........................................40
14.4 Troubleshooting Flowchart .........................41
15. Disassembly and Assembly Instructions ......61
15.1 Indoor Electronic Controllers, Cross Flow
Fan and Indoor Fan Motor Removal
Procedures .................................................61
16. Technical Data ..................................................65
16.1 Operation Characteristics...........................65
17. Exploded View and Replacement Parts List..69
17.1 Indoor Unit ..................................................69
17.2 Outdoor Unit ...............................................71
2
1. Safety Precautions
• Read the following “SAFETY PRECAUTIONS” carefully before perform any servicing.
• Electrical work must be installed or serviced by a licensed electrician. Be sure to use the correct rating of the power plug and
main circuit for the model installed.
• The caution items stated here must be followed because these important contents are related to safety. The meaning of each
indication used is as below. Incorrect installation or servicing due to ignoring of the instruction will cause harm or damage,
and the seriousness is classified by the following indications.
WARNING
CAUTION
• The items to be followed are classified by the symbols:
• Carry out test run to confirm that no abnormality occurs after the servicing. Then, explain to user the operation, care and
maintenance as stated in instructions. Please remind the customer to keep the operating instructions for future reference.
1. Do not modify the machine, part, material during repairing service.
2. If wiring unit is supplied as repairing part, do not repair or connect the wire even only partial wire break. Exchange the whole wiring unit.
This indication shows the possibility of causing death or serious injury.
This indication shows the possibility of causing injury or damage to properties.
This symbol denotes item that is PROHIBITED from doing.
WARNING
3. Do not wrench the fasten terminal. Pull it out or insert it straightly.
Engage authorized dealer or specialist for installation and servicing. If installation of servicing done by the user is defective, it will cause
4.
water leakage, electrical shock or fire.
5. Install according to this installation instructions strictly. If installation is defective, it will cause water leakage, electric shock or fire.
Use the attached accessories parts and specified parts for installation and servicing. Otherwise, it will cause the set to fall, water leakage,
6.
fire or electrical shock.
Install at a strong and firm location which is able to withstand the set’s weight. If the strength is not enough or installation is not properly
7.
done, the set will drop and cause injury.
For electrical work, follow the local national wiring standard, regulation and the installation instruction. An independent circuit and single
8.
outlet must be used. If electrical circuit capacity is not enough or defect found in electrical work, it will cause electrical shock or fire.
This equipment is strongly recommended to be installed with Earth Leakage Circuit Breaker (ELCB) or Residual Current Device (RCD).
9.
Otherwise, it may cause electrical shock and fire in case equipment breakdown or insulation breakdown.
Do not use joint cable for indoor/outdoor connection cable. Use the specified indoor/outdoor connection cable, refer to installation
10.
instruction CONNECT THE CABLE TO THE INDOOR UNIT and connect tightly for indoor/outdoor connection. Clamp the cable so that no
external force will be acted on the terminal. If connecting or fixing is not perfect, it will cause heat up or fire at the connection.
Wire routing must be properly arranged so that control board cover is fixed properly. If control board cover is not fixed perfectly, it will
11.
cause heat-up or fire at the connection point of terminal, fire or electrical shock.
When install or relocate air conditioner, do not let any substance other than the specified refrigerant, eg. air etc. mix into refrigeration cycle
12.
(piping). (Mixing of air etc. will cause abnormal high pressure in refrigeration cycle and result in explosion, injury etc.).
Do not install outdoor unit near handrail of veranda. When installing air-conditioner unit at veranda of high rise building, child may climb up
13.
to outdoor unit and cross over the handrail and causing accident.
This equipment must be properly earthed. Earth line must not be connected to gas pipe, water pipe, earth of lightning rod and
14.
telephone. Otherwise, it may cause electrical shock in case equipment breakdown or insulation breakdown.
15. Keep away from small children, the thin film may cling to nose and mouth and prevent breathing.
Do not use unspecified cord, modified cord, joint cord or extension cord for power supply cord. Do not share the single outlet with
16.
other electrical appliances. Poor contact, poor insulation or over current will cause electrical shock or fire.
Tighten the flare nut with torque wrench according to specified method. If the flare nut is over-tightened, after a long period, the flare may
17.
break and cause refrigerant gas leakage.
For R410A models, when connecting the piping, do not use any existing (R22) pipes and flares nuts. Using such same may cause
abnormally high pressure in the refrigeration cycle (piping), and possibly result in explosion and injury. In case of using existing
(R22) pipes during installation of R410A models, must carry out pump down properly to collect back the refrigerant and oil before
18.
installation new unit.
Thickness of copper pipes used with R410A must be more than 0.6mm. Never use copper pipes thinner than 0.6mm.
It is desirable that the amount of residual oil is less than 40 mg/10m.
3
WARNING
During installation, install the refrigerant piping properly before run the compressor. (Operation of compressor without fixing refrigeration
19.
piping and valves at opened condition will cause suck-in of air, abnormal high pressure in refrigeration cycle and result in explosion, injury
etc.).
During pump down operation, stop the compressor before remove the refrigeration piping. (Removal of refrigeration piping while
20.
compressor is operating and valves are opened condition will cause suck-in of air, abnormal high pressure in refrigeration cycle and result
in explosion, injury etc.)..
After completion of installation or service, confirm there is no leakage of refrigerant gas. It may generate toxic gas when the refrigerant
21.
contacts with fire.
22. Ventilate if there is refrigerant gas leakage during operation. It may cause toxic gas when the refrigerant contacts with fire.
23. Do not insert your fingers or other objects into the unit, high speed rotating fan may cause injury
24. Must not use other parts except original parts describe in catalog and manual.
25. Using of refrigerant other than the specified type may cause product damage, burst and injury etc.
CAUTION
Do not install the unit at place where leakage of flammable gas may occur. In case gas leaks and accumulates at surrounding of
1.
the unit, it may cause fire.
Carry out drainage piping as mentioned in installation instructions. If drainage is not perfect, water may enter the room and damage the
2.
furniture.
Tighten the flare nut with torque wrench according to specified method. If the flare nut is over-tightened, after a long period, the flare may
3.
break and cause refrigerant gas leakage.
4. Do not touch outdoor unit air inlet and aluminium fin. It may cause injury.
5. Select an installation location which is easy for maintenance.
Pb free solder has a higher melting point than standard solder; typically the melting point is 50°F – 70°F (30°C – 40°C) higher. Please use
6.
a high temperature solder iron. In case of the soldering iron with temperature control, please set it to 700 ± 20°F (370 ± 10°C).
Pb free solder will tend to splash when heated too high (about 1100°F / 600°C).
Power supply connection to the air conditioner. Connect the power supply cord of the air conditioner to the mains using one of the
following methods.
Power supply point shall be the place where there is ease for access for the power disconnection in case of emergency. In some
countries, permanent connection of this room air conditioner to the power supply is prohibited.
7.
i. Power supply connection to the receptacle using a power plug.
Use an approved 15/16A (1.0 ~ 1.75HP) or 16A (2.0HP) or 20A (2.5HP), power plug with earth pin for the connection to the socket.
ii. Power supply connection to a circuit breaker for the permanent connection.
Use an approved 16A (1.0 ~ 2.0HP) or 20A (2.5HP), circuit breaker for the permanent connection. It must be a double pole switch with
a minimum 3.0 mm contact gap.
Do not release refrigerant during piping work for installation, servicing, reinstallation and during repairing a refrigerant parts. Take
8.
care of the liquid refrigerant, it may cause frostbite.
9. Installation or servicing work: It may need two people to carry out the installation or servicing work.
10. Do not install this appliance in a laundry room or other location where water may drip from the ceiling, etc.
11. Do not sit or step on the unit, you may fall down accidentally.
12. Do not touch the sharp aluminum fins , sharp parts may cause injury.
4
2. Specification
Model
Performance Test Condition AHRI AHRI
Power Supply
Min. Mid. Max. Min. Mid. Max. Min. Mid. Max. Min. Mid. Max.
Capacity
Running Current A - 7.2 - - 6.3 - - 11.9 - - 10.8 -
Input Power W 430 1.30k 1.60k 430 1.30k 1.60k 430 2.35k 2.72k 430 2.35k 2.72k
EER
Cooling
Compressor
Indoor Fan
Outdoor Fan
Indoor Airflow
Power Factor % - 87 - - 90 - - 95 - - 95 -
Indoor Noise (H / L / QLo)
Outdoor Noise (H / L / QLo)
Max Current (A) / Max Input Power (W) 11.2 / 2.36k 12.8 / 2.85k
Starting Current (A) 7.2 11.9
Min Circuit Ampacity 15.0 20.0
Max. Overcurrent Protection 20.0 25.0
SEER / HSPF 18.00 / - 17.50 / -
Type Hermetic Motor (Rotary) Hermetic Motor (Rotary)
Motor Type Brushless (4 poles) Brushless (4 poles)
Output Power W 1.70k 1.70k
Type Cross-flow fan Cross-flow fan
Material ASG30K1 ASG30K1
Motor Type Transistor (8 poles) Transistor (8 poles)
Input Power W 94.8 - 94.8 94.8 - 94.8
Output Power W 40 40
QLo rpm 990 1020
Lo rpm 1090 1120
Speed
Material PP PP
Motor Type DC (8 poles) DC (8 poles)
Input Power W - -
Output Power W 60 60
Speed Hi rpm 700 700
Moisture Removal L/h (Pt/h) 1.4 (3.0) 3.6 (7.6)
Outdoor
Airflow
Me rpm 1270 1300
Hi rpm 1460 1480
SHi rpm 1500 1600
Type Propeller Propeller
QLo m3/min (ft3/min) 11.74 (415) 11.97 (423)
Lo m3/min (ft3/min) 13.15 (464) 13.37 (472)
Me m3/min (ft3/min) 15.71 (555) 15.88 (561)
Hi m3/min (ft3/min) 18.4 (650) 18.4 (650)
SHi m
Hi m
Indoor CS-S18NKUA CS-S24NKUA
Outdoor CU-S18NKUA CU-S24NKUA
Phase, Hz Single, 60 Single, 60
V 208 230 208 230
kW 1.70 5.01 5.80 1.70 5.01 5.80 1.70 7.02 8.00 1.70 7.02 8.00
BTU/h 5800 17100 19800 5800 17100 19800 5800 24000 27200 5800 24000 27200
W/W 3.95 3.85 3.63 3.95 3.85 3.63 3.95 2.99 2.94 3.95 2.99 2.94
Btu/hW 13.45 13.15 12.35 13.45 13.15 12.35 13.45 10.20 10.00 13.45 10.20 10.00
dB-A 47 / 39 / 36 47 / 39 / 36 48 / 40 / 37 48 / 40 / 37
Power Level dB 63 / - 63 / - 64 / - 64 / -
dB-A 49 / - / - 49 / - / - 51 / - / - 51 / - / -
Power Level dB 63 / - 63 / - 65 / - 65 / -
3
/min (ft3/min) 18.97 (670) 20.07 (709)
3
/min (ft3/min) 54.5 (1925) 54.5 (1925) 54.5 (1925) 54.5 (1925)
5
Model
Refrigeration
Cycle
Dimension
Weight Net (I/D / O/D) kg (lb) 12 (26) 60 (132) 12 (26) 60 (132)
Pipe Diameter (Liquid / Gas) mm (inch) 6.35 (1/4) / 12.70 (1/2) 6.35 (1/4) / 15.88 (5/8)
Length range (min – max) m (ft) 3 (9.8) ~ 30.5 (100.0) 3 (9.8) ~ 40 (131.2)
I/D & O/D Height different m (ft) 15 (49.2) 15 (49.2)
Piping
Additional Gas Amount g/m (oz/ft) 25 (0.3) 25 (0.3)
Length for Additional Gas m (ft) 10 (32.8) 10 (32.8)
Drain Hose
Indoor Heat
Exchanger
Outdoor
Heat
Exchanger
Air Filter
Power Supply Cord A - -
Protection Device - -
Indoor Operation Range
Outdoor Operation Range
1. Cooling capacities are based on indoor temperature of 80°F DRY BULB, 67°F WET BULB and outdoor air temperature of 95°F DRY BULB,
75°F WET BULB.
2. Specifications are subjected to change without prior notice for further improvement.
Control Device Expansion Valve Expansion Valve
Refrigerant Oil cm3 FV50S (800) FV50S (800)
Refrigerant Type g (oz) R410A, 1.60k (56.5) R410A, 1.85k (65.3)
Height(I/D / O/D) mm (inch) 290 (11-7/16) / 795 (31-5/16) 290 (11-7/16) / 795 (31-5/16)
Width (I/D / O/D) mm (inch) 1070 (42-5/32) / 875 (34-15/32) 1070 (42-5/32) / 875 (34-15/32)
Depth (I/D / O/D) mm (inch) 235 (9-9/32) / 320 (12-5/8) 235 (9-9/32) / 320 (12-5/8)
Standard length m (ft) 7.5 (24.6) 7.5 (24.6)
Inner Diameter mm (inch) 16.7 (5/8) 16.7 (5/8)
Length mm (inch) 650 (25-5/8) 650 (25-5/8)
Fin Material Aluminium (Pre Coat) Aluminium (Pre Coat)
Fin Type Slit Fin Slit Fin
Row x Stage x FPI 2 × 15 × 21 2 × 15 × 21
Size (W x H x L) inch (1) × (12-3/8) × (31-7/8) (1) × (12-3/8) × (31-7/8)
Fin Material Aluminium (Blue coated) Aluminium (Blue coated)
Fin Type Corrugate Fin Corrugate Fin
Row x Stage x FPI 2 × 36 × 19 2 × 36 × 18
Size (W x H x L) inch
Material Polypropelene Polypropelene
Type One-touch One-touch
Power Supply Outdoor Outdoor
Thermostat - -
DRY BULB WET BULB DRY BULB WET BULB
Indoor CS-S18NKUA CS-S24NKUA
Outdoor CU-S18NKUA CU-S24NKUA
(1-3/8) × (29-3/4) × (34-1/4)
(35-3/8)
Maximum 89.6 73.4 89.6 73.4
Minimum 60.8 51.8 60.8 51.8
Maximum 109.4 78.8 109.4 78.8
Minimum 0.0 - 0.0 -
(1-3/8) × (29-3/4) × (34-1/4)
(35-3/8)
6
3. Location of Controls and Components
3.1 Indoor Unit
3.2 Outdoor Unit
3.3 Remote Control
7
4. Dimensions
4.1 Indoor Unit
8
4.2 Outdoor Unit
9
5. Refrigeration Cycle Diagram
10
6. Block Diagram
11
7. Wiring Connection Diagram
7.1 Indoor Unit
12
7.2 Outdoor Unit
13
8. Electronic Circuit Diagram
8.1 Indoor Unit
14
8.2 Outdoor Unit
15
9. Printed Circuit Board
9.1 Indoor Unit
9.1.1 Main Printed Circuit Board
16
9.1.2 Power Printed Circuit Board
9.1.3 Indicator Printed Circuit Board
17
9.2 Outdoor Unit
9.2.1 Main Printed Circuit Board
18
10. Installation Instruction
• IMPORTANT (only for S18NKUA)
This product has been designed and manufactured to meet ENERGY STAR® criteria for energy efficiency when
matched with appropriate coil components. However, proper refrigerant charge and proper air flow are critical to
archive rated capacity and efficiency. Installation of this product should follow the manufacturer’s refrigerant
charging and air flow instructions. Failure to confirm proper charge and airflow may reduce energy
efficiency and shorten equipment life.
10.1.1 Select the Best Location
10.1.1.1 Indoor Unit
• Do not install the unit in excessive oil fume areas
such as kitchens, workshops etc.
• There should not be any heat source or steam
near the unit.
• There should not be any obstacles blocking the air
circulation.
• A place where air circulation in the room is good.
• A place where drainage can be easily done.
• A place where noise prevention is taken into
consideration.
• Do not install the unit near a doorway.
• Ensure the spaces indicated by arrows from the
wall, ceiling, fence or other obstacles.
• Recommended installation height for indoor unit
shall be at least 8.2 ft.
10.1.1.2 Outdoor Unit
• If an awning is built over the unit to prevent direct
sunlight or rain, be careful that heat radiation from
the condenser is not obstructed.
• There should not be any animal or plant which
could be affected by hot air discharged.
• Keep the spaces indicated by arrows from wall,
ceiling, fence or other obstacles.
• Do not place any obstacles which may cause a
short circuit of the discharged air.
• If piping length is over the [piping length for
additional gas], additional refrigerant should be
added as shown in the table.
• Recommended installation height for outdoor unit
should be above the seasonal snow level.
Example: For S18NKUA
If the unit is installed at 41 ft distance, the quantity of
additional refrigerant should be 2.46 oz .... (41 - 32.8)
ft × 0.3 oz/ft = 2.46 oz.
10.1.2 Indoor/Outdoor Unit Installation
Diagram
19
10.1.3 Indoor Unit
10.1.3.1 How to Fix Installation Plate
The mounting wall must be strong and solid enough to prevent if from the vibration.
Model
S18NKUA, S24NKUA 23 1/32” 3 7/32” 6 1/2” 6 7/32” 6 21/32” 8 5/8”
1
○
○2 ○3 ○4 ○5 ○6
Dimension
The centre of installation plate should be at more than c at right and left of the wall.
The distance from installation plate edge to ceiling should more than d.
From installation plate left edge to unit’s left side is e.
From installation plate right edge to unit’s right side is f.
B : For left side piping, piping connection for liquid should be about g from this line.
○
: For left side piping, piping connection for gas should be about h from this line.
1 Mount the installation plate on the wall with 5 screws or more (at least 5 screws).
(If mounting the unit on the concrete wall, consider using anchor bolts.)
o Always mount the installation plate horizontally by aligning the marking-off line with the thread and using
a level gauge.
2 Drill the piping plate hole with ø2 ¾” hole-core drill.
o Line according to the left and right side of the installation plate. The meeting point of the extended line is
the center of the hole. Another method is by putting measuring tape at position as shown in the diagram
above. The hole center is obtained by measuring the distance namely 5 1/16” for left and right hole
respectively.
o Drill the piping hole at either the right or the left and the hole should be slightly slanting to the outdoor
side.
10.1.3.2 To Drill a Hole in the Wall and
Install a Sleeve of Piping
1 Insert the piping sleeve to the hole.
2 Fix the bushing to the sleeve.
3 Cut the sleeve until it extrudes about 19/32”
from the wall.
4 Finish by sealing the sleeve with putty or
caulking compound at the final stage.
20
10.1.3.3 Indoor Unit Installation
10.1.3.4 For the right rear piping
10.1.3.5 For the right bottom piping
10.1.3.6 For the embedded piping
(This can be used for left rear piping and bottom
piping also.)
21
10.1.3.7 Connect the Cable to the Indoor Unit
1. The inside and outside connecting cable can
be connected without removing the front grille.
2. Unscrew the conduit cover and fix the conduit
connector to conduit cover with lock nut, then
secure it against chassis.
3. Connecting wire between indoor unit and
outdoor unit should be UL listed or CSA
approved 4 conductor wires minimum AWG16
in accordance with local electric codes.
o Ensure the colour of wires of outdoor unit
and terminal number are the same as the
indoor's respectively.
This equipment must be properly earthed.
o Earth lead wire shall be Yellow/Green
(Y/G) in colour and shall be longer than
other lead wires as shown in the figure for
electrical safety in case of the slipping.
22
10.1.3.8 Wire Stripping and connecting requirement
10.1.3.9 Cutting and flaring the piping
1 Please cut using pipe cutter and then remove the burrs.
2 Remove the burrs by using reamer. If burrs is not removed, gas leakage may be caused. Turn the piping end
down to avoid the metal powder entering the pipe.
3 Please make flare after inserting the flare nut onto the copper pipes.
23
10.1.4 Outdoor Unit
10.1.4.1 Install the Outdoor Unit
• After selecting the best location, start installation to INDOOR/OUTDOOR UNIT INSTALLATION DIAGRAM.
1 Fix the unit on concrete or rigid frame firmly and horizontally by bolt nut (ø13/32”).
2 When installing at roof, please consider strong wind and earthquake.
Please fasten the installation stand firmly with bolt or nails.
Model A B C D
S18NKUA, S24NKUA 24 1/8” 5 5/32” 5/8” 14 3/16”
Do not overtighten, over tightening may cause gas leakage.
10.1.4.2 Connect the Piping
10.1.4.2.1 Connecting the piping to
indoor
Please make flare after inserting flare nut (locate at
joint portion of tube assembly) onto the copper pipe.
(In case of using long piping)
Connect the piping
• Align the center of piping and sufficiently tighten
the flare nut with fingers.
• Further tighten the flare nut with torque wrench in
specified torque as stated in the table.
10.1.4.2.2 Connecting the piping to
outdoor
Decide piping length and then cut by using pipe cutter.
Remove burrs from cut edge.
Make flare after inserting the flare nut (locate at valve)
onto the copper pipe.
Align center of piping to valve and then tighten with
torque wrench to the specified torque as stated in the
table.
10.1.4.2.3 Gas Leak Checking
Pressure test to system to 400 PSIG with dry nitrogen,
in stages. Thoroughly leak check the system.
If the pressure holds, release the nitrogen and
proceed to section 10.1.4.3.
Piping size Torque
1/4” 13.3 lbf.ft
3/8” 31.0 lbf.ft
1/2” 40.6 lbf.ft
5/8” 47.9 lbf.ft
3/4” 73.8 lbf.ft
24
10.1.4.3 Evacuation of the equipment
WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND
PIPES in the following procedure.
1. Connect a charging hose with a push pin to the Low side of a charging set and the service port of the 3-way
valve
2. Connect the micron gauge between vacuum pump and service port of outdoor units.
3. Turn on the power switch of the vacuum pump and make sure that connect digital micron gauge and to pull
down to a value of 500 microns.
4. To make sure micron gauge a value 500 microns and close the low side valve of the charging set and turn off
the vacuum pump.
5. Disconnect the vacuum pump house from the service port of the 3-way valve.
6. Tighten the service port caps of the 3-way valve at a torque of 13.3 Ibf.ft with a torque wrench.
7. Remove the valve caps of both of the 2-way valve and 3-way valve. Position both of the valves to “Open”
using a hexagonal wrench (5/32").
8. Mount valve caps onto the 2-way valve and the 3-way valve.
o Be sure to check for gas leakage.
10.1.4.4 Connect the Cable to the Outdoor Unit
1. Remove control board cover (Resin and Metal).
2. Remove particular plate.
3. Remove plugs.
4. Fix the conduit connectors to the knockout holes with lock-nuts, then secure them against the side panel.
5. All wires pass through conduits & particular plate’s opening hole.
6. Connecting wire between indoor unit and outdoor unit should be UL listed or CSA approved 4 conductor
wires minimum AWG16 in accordance with local electric codes.
7. Wire connection to the power supply (208/230V 60Hz) through circuit breaker.
o Connect the UL listed or CSA approved wires minimum AWG12 to the terminal board, and connect the
other end of the wires to ELCB / GFCI.
8. Connect the power supply cord and connecting wire between indoor unit and outdoor unit according to the
diagram below.
25
9. Secure the wire onto the control board with the holder (clamper).
10. After completing wiring connections, reattach the particular plate and control board cover (Metal and Resin)
to the original position with the screws.
11. For wire stripping and connection requirement, refer to instruction g of indoor unit.
This equipment must be properly earthed.
o Earth lead wire shall be Yellow/Green (Y/G) in colour and longer than other lead wires for electrical
safety in case of the slipping.
10.1.4.5 Piping Insulation
1. Please carry out insulation at pipe connection portion as mentioned in Indoor/Outdoor Unit Installation
Diagram. Please wrap the insulated piping end to prevent water from going inside the piping.
2. If drain hose or connecting piping is in the room (where dew may form), please increase the insulation by
using POLY-E FOAM with thickness ¼” or above.
26
11. Operation Control
A
p
11.1 Basic Function
Inverter control, which equipped with a microcomputer in determining the most suitable operation mode as time
passes, automatically adjusts output power for maximum comfort always. In order to achieve the suitable operation
mode, the microcomputer maintains the set temperature by measuring the temperature of the environment and
performing temperature shifting. The compressor at outdoor unit is operating following the frequency instructed by
the microcomputer at indoor unit that judging the condition according to internal setting temperature and intake air
temperature.
11.1.1 Internal Setting Temperature
Once the operation starts, remote control setting temperature will be taken as base value for temperature shifting
processes. These shifting processes are depending on the air conditioner settings and the operation environment.
The final shifted value will be used as internal setting temperature and it is updated continuously whenever the
electrical power is supplied to the unit.
Remote Control Setting Temperature
60.8°F ~ 86°F
Indoor Air Temperature Shifting
Outdoor Air Temperature Shifting
Powerful Mode Shifting
Setting Temperature Limit Checking
(Min: 60.8°F; Max: 91.4°F)
Internal Setting Temperature
11.1.2 Cooling Operation
11.1.2.1 Thermostat control
• Compressor is OFF when intake Air Temperature - Internal Setting Temperature < -2.7°F.
• Compressor is ON after waiting for 3 minutes, if the Intake Temperature - Internal Setting Temperature >
Compressor OFF point.
11.1.3 Soft Dry Operation
11.1.3.1 Thermostat control
• Compressor is OFF when Intake Temperature - Internal Setting Temperature < -3.6°F.
• Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature >
Compressor OFF point.
11.1.3.2 Automatic Operation
• This mode can be set using remote control and the operation is decided by indoor intake air temperature.
• During operation mode judgment at the beginning of the Auto Mode operation, indoor fan motor (with speed of
Lo-) is running for 30 seconds to detect the indoor intake air temperature.
• The operation mode is decided based on below chart.
73.4°F
• After the operation mode is decided, the unit operation will follow the respective operation mode control.
Cooling
operation
Soft Dry
operation
Indoor intake
ir Tem
27
11.2 Indoor Fan Motor Operation
11.2.1 Basic Rotation Speed
• Manual Fan Speed
o Fan motor’s number of rotation is determined according to remote control setting.
Remote control ○ ○ ○ ○ ○
Tab Hi Me+ Me Me- Lo
• Auto Fan Speed
o According to room temperature and setting temperature, indoor fan speed is determined automatically.
o The indoor fan will operate according to pattern below.
• Feedback control
Fan Speed a b c d e f g h a b
Higher
Medium
Lower
[1 pattern : 10s]
o Immediately after the fan motor is started, feedback control is performed once every second.
o During fan motor on, if fan motor feedback ≥ 2550 rpm or <50 rpm continuously for 10 seconds, the fan
motor error counter increased; fan motor is then stopped and restarted. If the fan motor error counter
increased to 7, then H19 – fan motor error is detected. Operation stopped and could not be restarted.
11.3 Outdoor Fan Motor Operation
Outdoor fan motor is operated with one fan speed only. Outdoor fan turns on when compressor starts to operate. But
outdoor fan will turns off 30 seconds after compressor stops to operate.
ON ON
Compressor OFF
ON Fan Speed ON
Outdoor Fan 30 sec OFF
11.4 Airflow Direction
• There are two types of airflow, vertical airflow (directed by horizontal vane) and horizontal airflow (directed by
vertical vanes).
• Control of airflow direction can be automatic (angles of direction is determined by operation mode, heat
exchanger temperature and intake air temperature) and manual (angles of direction can be adjusted using
remote control).
28
11.4.1 Vertical Airflow
Operation Mode Airflow Direction
Cooling
Soft Dry
Auto 20 ~ 45
Manual 20 26 32 37 45
Auto 20 ~ 45
Manual 20 26 32 37 45
1 2 3 4 5
• Automatic vertical airflow direction can be set using remote control; the vane swings up and down within the
angles as stated above. It does not swing during fan motor stop. When the air conditioner is stopped using
remote control, the vane will shift to close position.
• Manual vertical airflow direction can be set using remote control; the angles of the vane are as stated above and
the positions of the vane are as figure below. When the air conditioner is stopped using remote control, the vane
will shift to close position.
1
2
3
4
Side View
140°
Close position
5
Vane Angle (°)
11.4.2 Horizontal Airflow
• Automatic airflow direction can be set using remote control; the vane swings left and right within the angles as
stated below. It does not swing during fan motor stop.
Operation Mode Vane Angle (°)
Cooling and soft dry 68 ~112
• Manual vertical airflow direction can be set using remote control; the angles of the vane are as stated below and
the positions of the vane are as figure below:
11.5 Quiet Operation (Cooling Mode/Cooling Area of Dry Mode)
• Purpose
o To provide quiet cooling operation compare to normal operation.
• Control condition
o Quiet operation start condition
When Quiet button at remote control is pressed Quiet INDICATOR illuminates.
o Quiet operation stop condition
When one of the following conditions is satisfied, quiet operation stops:
• Powerful button is pressed.
• Stop by OFF/ON button.
• OFF Timer activates.
• Quiet button is pressed again.
When quiet operation is stopped, operation is shifted to normal operation with previous setting.
When fan speed is changed, quiet operation is shifted to quiet operation of the new fan speed.
When operation mode is changed, quiet operation is shifted to quiet operation of the new mode.
29
During quiet operation, if ON timer activates, quiet operation maintains.
p
p
)
y
After off, when on back, quiet operation is not memorized.
• Control content
o Fan speed is changed from normal setting to quiet setting of respective fan speed. This is to reduce sound of
Hi, Me, Lo for 3dB (more than 3dB for some models).
o Fan speed for quiet operation is -1 step from setting fan speed.
11.6 Powerful Mode Operation
• When the powerful mode is selected, the internal setting temperature will shift lower up to 3.6°F (for Cooling/Soft
Dry) than remote control setting temperature for 20 minutes and the fan speed will increase to achieve the setting
temperature quickly.
• Powerful operation stops condition
o When one of the following condition is satisfied, powerful operation stops:
Quiet button is pressed.
Stop by OFF/ON button.
OFF Timer activates.
Powerful button is pressed again.
Powerful operation continue for 20 minutes.
11.7 Timer Control
11.7.1 ON Timer Control
ON timer can be set using remote control, the unit with timer set will start operate earlier than the setting time. This is
to provide a comfortable environment when reaching the set ON time.
60 minutes before the set time, indoor (at fan speed of Lo-) and outdoor fan motor start operate for 30 seconds to
determine the indoor intake air temperature and outdoor air temperature in order to judge the operation starting time.
From the judgment, the decided operation will start operation earlier than the set time as shown below.
Indoor intake air
tem
erature (°F)
86
15 min
10 min
77
5 min
86 95
Cooling / Soft Dr
Outdoor air
tem
erature (°F
11.7.2 OFF Timer Control
OFF timer can be set using remote control, the unit with timer set will stop operate at set time.
11.8 Random Auto Restart Control
• When the power supply is cut off during the operation of air conditioner, the compressor will re-operate within
three to four minutes. There are 10 patterns to be selected randomly after power supply resumes.
• This control is not applicable during OFF/ON Timer setting.
30
11.9 Indication Panel
LED POWER TIMER QUIET POWERFUL
Color Green Orange Orange Orange
Light ON Operation ON Timer Setting ON Quiet Mode ON Powerful Mode ON
Light OFF Operation OFF Timer Setting OFF Quiet Mode OFF Powerful Mode OFF
Note:
• If POWER LED blinks, the possible operation of the unit is operation mode judgment, or ON timer sampling.
• If TIMER LED blinks, there is an abnormal operation occurs.
31
12. Protection Control
12.1 Restart Control (Time Delay Safety Control)
• The compressor will not turn on within 3 minutes from the moment operation stops, although the unit is turned on
again by pressing OFF/ON button at remote control within this period.
• This control is not applicable if the power supply is cut off and on again.
• This phenomenon is to balance the pressure inside the refrigerant cycle.
12.2 30 Seconds Forced Operation
• Once the air conditioner is turned on, the compressor will not stop within 30 seconds in a normal operation
although the intake air temperature has reached the thermo-off temperature. However, force stop by pressing the
OFF/ON button at the remote control is permitted or the Auto OFF/ON button at indoor unit.
• The reason for the compressor to force operation for minimum 30 seconds is to allow the refrigerant oil run in a
full cycle and return back to the outdoor unit.
12.3 Total Running Current Control
• When the outdoor unit total running current (AC) exceeds X value, the frequency instructed for compressor
operation will be decreased.
• If the running current does not exceed X value for 5 seconds, the frequency instructed will be increased.
Model S18*** S24***
Operation Mode X (A) Y (A) X (A) Y (A)
Cooling / Soft Dry (A) 10.85 19.30 12.47 19.30
Cooling / Soft Dry (B) 9.84 19.30 11.46 19.30
• The first 30 minutes of cooling operation, (A) will be applied.
12.4 IPM (Power Transistor) Prevention Control
• Overheating Prevention Control
o When the IPM temperature rises to 212°F, compressor operation will stop immediately.
o Compressor operation restarts after 3 minutes the temperature decreases to 203°F.
• DC Peak Current Control
o When electric current to IPM exceeds set value of 29.9A, the compressor will stop operate. Then, operation
will restart after 3 minutes.
o If the set value is exceeded again more than 30 seconds after the compressor starts, the operation will
restart after 2 minute.
o If the set value is exceeded again within 30 seconds after the compressor starts, the operation will restart
after 1 minute. If this condition repeats continuously for 7 times, all indoor and outdoor relays will be cut off.
32
12.5 Compressor Overheating Prevention Control
• Instructed frequency for compressor operation will be regulated by compressor discharge temperature. The
changes of frequency are as below.
• If compressor discharge temperature exceeds 233.6°F, compressor will be stopped, occurs 4 times per 20
minutes, timer LED will be blinking. “F97” is indicated.
12.6 Low Pressure Protection Control (Gas Leakage Detection)
• Control start conditions
o For 5 minutes, the compressor continously operates and outdoor total current is between 0.81A and 1.23A.
o During Cooling and Soft Dry operation:
Indoor suction temperature – indoor piping temperature is below 7.2°F
• Control contents
o Compressor stops (and restart after 3 minutes).
o If the conditions above happened 2 times within 20 minutes, the unit will:
Stop operation
Timer LED blinks and “F91” indicated.
12.7 Low Frequency Protection Control 1
• When the compressor operates at frequency lower than 25Hz continued for 240 minutes, the operation frequency
will be change to 24Hz for 2 minutes.
12.8 Low Frequency Protection Control 2
• When all below conditions comply, minimum limit of compressor frequency will be set.
Temperature, T, for: Cooling / Soft Dry
Indoor intake air (°F) T < 57.2 or ≥ 86
Outdoor air (°F) T < 55.4 or T ≥ 100.4
Indoor heat exchanger (°F) T < 86
12.9 Outdoor Air Temperature Control
• The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the
diagram below.
• This control will begin 1 minute after the compressor starts.
• Compressor frequency will adjust based on outdoor air temperature.
100.4°F or 77°F
Outdoor air temperature
Free
Limited Frequency
98.6°F or 71.6°F
33
12.10 Cooling Overload Control
• Pipe temperature limitation / restriction.
o Detects the outdoor pipe temperature and carry out restriction / limitation below (Limit the compressor
operation frequency)
o The compressor stops if outdoor pipe temperature exceeds 145.4°F.
o If the compressor stops 4 times in 20 minutes, Timer LED blinks (“F95” indicated: Outdoor high pressure rise
protection)
12.11 Freeze Prevention Control
• When indoor heat exchanger temperature is lower than 32°F continuously for 6 minutes, compressor will stops
operation.
• Compressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 55.4°F.
• At the same time, indoor fan speed will be higher than during its normal operation.
• If the indoor heat exchanger temperature is higher than 55.4°F for 5 minutes, the fan speed will return to its
normal operation.
12.12 Freeze Prevention Control 2
• Control start conditions
o During Cooling operation and soft dry operation
During thermo OFF condition, indoor intake temperature is less than 50°F or
Compressor stops for freeze prevention control
o Either one of the conditions above occurs 5 times in 60 minutes.
• Control contents
o Operation stops
o Timer LED blinks and “H99” indicated
12.13 Dew Prevention Control
• To prevent dew formation at indoor unit discharge area.
• This control will be activated if:
o Cooling mode or Quiet mode is activated.
o Remote control setting temperature is less than 77°F.
o Fan Speed is at CLo or QLo.
o Room temperature is constant (±33.8°F) for 30 minutes.
o Compressor is continuously running.
• Fan speed will be adjusted accordingly in this control.
o Fan speed will be increased slowly if the unit is in quiet mode but no change in normal cooling mode.
34
13. Servicing Mode
13.1 Auto Off/On Button
1 AUTO OPERATION MODE
The Auto Operation will be activated immediately once the Auto OFF/ON button is pressed. This operation
can be used to operate air conditioner with limited function if remote control is misplaced or malfunction.
2 TEST RUN OPERATION (FOR PUMP DOWN/SERVICING PURPOSE)
The Test Run Operation will be activated if the Auto OFF/ON button is pressed continuously for more than 5
seconds. A “beep” sound will be heard at the fifth seconds, in order to identify the starting of this operation.
The Auto OFF/ON button may be used together with remote control to set / change the advance setting of air
conditioner operation.
Auto OFF/ON
Button Pressed
Auto Operation Test Run Operation
5 sec
(Forced Cooling Operation)
Auto OFF/ON
Button Pressed
Stop
3 REMOTE CONTROL NUMBER SWITCH MODE
The Remote Control Number Switch Mode will be activated if the Auto OFF/ON button is pressed
continuously for more than 11 seconds (3 “beep” sounds will occur at 11
Control Number Switch Mode is in standby condition), press “AC Reset” button and then press any button at
remote control to transmit and store the desired transmission code to the EEPROM.
There are 4 types of remote control transmission code could be selected. The indoor unit will only operate
when received signal with same transmission code from remote control. This could prevent signal
interference when there are 2 or more units installed nearby together.
To change remote control transmission code, short or open jumpers at the remote control printed circuit
board.
Jumper A (J-A) Jumper B (J-B) Remote Control No.
4 REMOTE CONTROL RECEIVING SOUND OFF/ON MODE
The Remote Control Receiving Sound OFF/ON Mode will be activated if the Auto OFF/ON button is pressed
continuously for more than 16 seconds (4 “beep” sounds will occur at 16
Control Receiving Sound OFF/ON Mode is in standby condition) and press “AC Reset” button and then press
“Check” button at remote control.
Press Auto OFF/ON button to toggle remote control receiving sound.
- Short “beep”: Turn ON remote control receiving sound.
- Long “beep”: Turn OFF remote control receiving sound.
After Auto OFF/ON button is pressed, the 20 seconds counter for Remote Control Receiving Sound OFF/ON
Mode is restarted.
th
seconds to identify the Remote
Remote Control Printed Circuit Board
Short Open A (Default)
Open Open B
Short Short C
Open Short D
th
seconds to identify the Remote
35
13.2 Remote Control Button
13.2.1 SET Button
• To check remote control transmission code and store the transmission code to EEPROM
o Press “Set” button continuously for 10 seconds by using pointer
o Press “Timer Set” button unit a “beep” sound is heard as confirmation of transmission code change.
13.2.2 RESET (RC)
• To clear and restore the remote control setting to factory default.
o Press once to clear the memory
13.2.3 RESET (AC)
• To restore the unit’s setting to factory default.
o Press once to restore the unit’s setting
13.2.4 TIMER ▲
• To change indoor unit indicators’ intensity:
o Press continuously for 5 seconds.
13.2.5 TIMER ▼
• To change remote control display from Degree Celsius (°C) to Degree Fahrenheit (°F)
o Press continuously for 10 seconds.
36
14. Troubleshooting Guide
•
•
•
14.1 Refrigeration Cycle System
In order to diagnose malfunctions, ensure the air conditioner is free
from electrical problems before inspecting the refrigeration cycle.
Such problems include insufficient insulation, problem with the
power source, malfunction of a compressor and a fan. The normal
outlet air temperature and pressure of the refrigeration cycle
depends on various conditions, the standard values for them are
shown in the table to the right.
Normal Pressure and Outlet Air Temperature (Standard)
Cooling Mode
Condition: Indoor fan speed = High
Gas Pressure
PSI
2
G)
(kg/cm
130.5 ~ 174.0
(9 ~ 12)
Outdoor temperature = 95°F at cooling mode.
Compressor operate at rated frequency
Outlet air
Temperature
(°F)
53.6 ~ 60.8
Different in the intake
and outlet
air temperatures
Less than 14.4°F at the cooling mode
Value of electric current
during operation
Lower than specified
More than 14.4°F
(15 minutes after an
operation is started) at
cooling mode.
Higher than specified
Normal
Dusty condenser
preventing heat radiation
Excessive amount
of refrigerant
Measuring the air
temperature different
Measuring electric current
during operation
Cooling
Gas side
pressure
Mode
High
Low
Low
Inefficient compressor
Insufficient refrigerant
Clogged strainer or
Measuring gas side
pressure
capillary cube
37
14.1.1 Relationship between the condition of the air conditioner and pressure and
electric current
Condition of the
air conditioner
Insufficient refrigerant
(gas leakage)
Clogged capillary tube or
strainer
Low Pressure High Pressure Electric current during operation
Ô Ô Ô
Ô Ô Ô
Cooling Mode
Short circuit in the indoor unit
Heat radiation deficiency
of the outdoor unit
Inefficient compression
• Carry out the measurement of pressure, electric current, and temperature fifteen minutes after an operation is started.
Ô Ô Ô
Ò Ò Ò
Ò Ô Ô
38
14.2 Breakdown Self Diagnosis Function
14.2.1 Self Diagnosis Function (Three Digits Alphanumeric Code)
• Once error occurred during operation, the unit will stop its operation, and Timer LED blinks.
• Although Timer LED goes off when power supply is turned off, if the unit is operated under a breakdown
condition, the LED will ON again.
• In operation after breakdown repair, the Timer LED will not blink. The last error code (abnormality) will be stored
in IC memory.
14.2.2 To Make a Diagnosis
1 Timer LED starts to blink and the unit automatically stops the operation.
2 Press the CHECK button on the remote control continuously for 5 seconds.
3 “- -“ will be displayed on the remote control display.
Note: Display only for “- -“ (No signal transmission, no receiving sound and no
Power LED blinking)
4 Press the TIMER ▲ or ▼ button on the remote control. The code “H00” (no
abnormality) will be displayed and signal will be transmit to the main unit.
5 Each press of the button (▲ or ▼) will increase error code number and
transmit error code signal to the main unit.
6 When the latest abnormality code on the main unit and code transmitted from
the remote control are matched, Power LED will light up for 30 seconds and a
“beep” sound (continuously for 4 seconds) will be heard. If no codes are
matched, Power LED will light up for 0.5 seconds and no sound will be heard.
7 The breakdown diagnosis mode will be canceled unless pressing the CHECK
button continuously for 5 seconds or operating the unit for 30 seconds.
8 The LED will be off if the unit is turned off or the RESET button on the main
unit is pressed.
14.2.3 To Display Memorized Error Code (Protective Operation)
1 Turn power on.
2 Press the CHECK button on the remote control
3 “- -“ will be displayed on the remote control display.
Note: Display only for “- -“ (No signal transmission, no receiving sound and no Power LED blinking)
4 Press the TIMER ▲ or ▼ button on the remote control. The code “H00” (no abnormality) will be displayed
and signal will be transmit to the main unit.
5 Each press of the button (▲ or ▼) will increase error code number and transmit error code signal to the main
unit.
6 When the latest abnormality code on the main unit and code transmitted from the remote control are matched,
Power LED will light up for 30 seconds and a “beep” sound (continuously for 4 seconds) will be heard. If no
codes are matched, Power LED will light up for 0.5 seconds and no sound will be heard.
7 The breakdown diagnosis mode will be canceled unless pressing the CHECK button continuously for 5
seconds or operating the unit for 30 seconds.
8 The same diagnosis can be repeated by turning power on again.
14.2.4 To Clear Memorized Error Code after Repair (Protective Operation)
1 Turn power on (in standby condition).
2 Press the AUTO button for 5 seconds (a “beep” sound is heard) on the main unit to operate the unit at
Forced Cooling Operation Mode.
3 Press the CHECK button on the remote control for about 1 second with a pointed object to transmit signal to
main unit. A “beep” sound is heard, and the Error Code is cleared.
14.2.5 Temporary Operation (Depending On Breakdown Status)
1 Press the Auto OFF/ON button on the main unit (a “beep” sound is heard) to operate the unit. (Remote
control is enable again).
2 The unit can be temporarily be used until repaired.
Error Code Operation Temporary items
H23 Cooling
H27, H28 Cooling
Emergency Operation
with limited power
39
14.3 Error Code Table
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Diagnosis
display
H00 No abnormality detected - Normal operation
H11
H14
H16 Outdoor current transformer open circuit - -
H19 Indoor fan motor mechanism locked
H23
H27
H28
H30
H33 Indoor / outdoor wrong connection - -
H38 Indoor / outdoor mismatch (brand code) - - -
H98 Indoor temperature rise abnormality - -
H99
F11 4 way valve switching failure *
F90
F90 Power factor correction abnormality
F91 Refrigerant cycle abnormal
F93 Outdoor compressor abnormal revolution
F95 Cooling high pressure protection
F96
F97
F98 Total running current protection
F99
Abnormality / Protection control Abnormality Judgment
Indoor / Outdoor abnormal
communication
Indoor intake air temperature sensor
abnormality
Indoor heat exchanger temperature
sensor abnormality
Outdoor air temperature sensor
abnormality
Outdoor heat exchanger temperature
sensor abnormality
Discharge temperature sensor
abnormality
Indoor heat exchanger freeze prevention
protection
System and compressor microcomputer
communication error(for S10*** only)
Intelligent power transistor overheating
protection
Compressor temperature rise protection
control
Outdoor direct current (DC) peak
detection
> 1 min after starting
operation
Continue for 5 sec. -
7 occurrences
continuously
Continue for 5 sec.
Continue for 5 sec.
Continue for 5 sec.
Continue for 5 sec.
- -
4 occurrences within 30
minutes
2 occurrences within 5
seconds
4 occurrences within 20
minutes
2 occurrences within 20
minutes
4 occurrences within 20
minutes
4 occurrences within 20
minutes
- -
4 times occurrence within
20 minutes
3 times occurrence within
20 minutes
7 times occurrence
continuously
Note:
“○” – Frequency measured and fan speed fixed
“ * ”– For cooling only model, it is the indication when indoor heat exchanger sensor or indoor air intake sensor has
abnormality.
The memory data of error code is erased when the power supply is cut off, or press the Auto Switch until “beep”
sound heard following by pressing the CHECK button at remote control.
Although operation forced to stop when abnormality detected, emergency operation is possible for certain errors
(refer to Error Code Table) by using remote control or Auto OFF/ON button at indoor unit. However, the remote
control signal receiving sound is changed from one “beep” to four “beep” sounds.
Emergency
Operation
Indoor fan operation
only
-
○
○
○
-
-
-
-
-
-
-
-
-
Primary location to verify
• Internal / external cable connection
• Indoor / outdoor PCB
• Intake air temperature sensor
(defective or disconnected)
• Outdoor PCB
• IPM (Power transistor) module
• Indoor PCB
• Fan motor
• Heat exchanger temperature sensor
(defective or disconnected)
• Outdoor temperature sensor
(defective or disconnected)
• Outdoor heat exchanger
temperature sensor (defective or
disconnected)
• Outdoor discharge temperature
sensor (defective or disconnected)
• Indoor / outdoor supply voltage
Air filter dirty
Air circulation short circuit
Insufficient refrigerant
Air filter dirty
4-way valve
v-coil
Compressor
Outdoor PCB
Outdoor PCB
No refrigerant ( 3-way valve is
closed)
Outdoor compressor
Outdoor refrigerant circuit
Excess refrigerant
Improper heat radiation
IPM (Power transistor)
Insufficient refrigerant
Compressor
Excess refrigerant
Improper heat radiation
Outdoor PCB
IPM (Power transistor)
Compressor
40
14.4 Troubleshooting Flowchart
14.4.1 H11 (Indoor/Outdoor Abnormal Communication)
Malfunction Decision Conditions
• During startup and operation of cooling and heating, the data received from outdoor unit in indoor unit signal
transmission is checked whether it is normal.
Malfunction Caused
• Faulty indoor unit PCB.
• Faulty outdoor unit PCB.
• Indoor unit-outdoor unit signal transmission error due to wrong wiring.
• Indoor unit-outdoor unit signal transmission error due to breaking of wire in the connection wires between the
indoor and outdoor units.
• Indoor unit-outdoor unit signal transmission error due to disturbed power supply waveform.
Troubleshooting
41
14.4.2 H14 (Indoor Intake Air Temperature Sensor Abnormality)
Malfunction Decision Conditions
• During startup and operation of cooling and heating, the temperatures detected by the indoor intake air
temperature sensor are used to determine sensor errors.
Malfunction Caused
• Faulty connector connection.
• Faulty sensor.
• Faulty PCB.
Troubleshooting
42
14.4.3 H16 (Outdoor Current Transformer Open Circuit)
Malfunction Decision Conditions
• A current transformer (CT) is detected by checking the compressor running frequency (≥ rated frequency) and
CT detected input current (less than 1.14A) for continuously 20 seconds.
Malfunction Caused
• CT defective
• Outdoor PCB defective
• Compressor defective (low compression)
Troubleshooting
43
14.4.4 H19 (Indoor Fan Motor – DC Motor Mechanism Locked)
Malfunction Decision Conditions
• The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor
(feedback of rotation > 2550rpm or < 50rpm)
Malfunction Caused
• Operation stops due to short circuit inside the fan motor winding.
• Operation stops due to breaking of wire inside the fan motor.
• Operation stops due to breaking of fan motor lead wires.
• Operation stops due to Hall IC malfunction.
• Operation error due to faulty indoor unit PCB.
Troubleshooting
44
14.4.5 H23 (Indoor Pipe Temperature Sensor Abnormality)
Malfunction Decision Conditions
• During startup and operation of cooling and heating, the temperatures detected by the indoor heat exchanger
temperature sensor are used to determine sensor errors.
Malfunction Caused
• Faulty connector connection.
• Faulty sensor.
• Faulty PCB.
Troubleshooting
45
14.4.6 H27 (Outdoor Air Temperature Sensor Abnormality)
Malfunction Decision Conditions
• During startup and operation of cooling and heating, the temperatures detected by the outdoor air temperature
sensor are used to determine sensor errors.
Malfunction Caused
• Faulty connector connection.
• Faulty sensor.
• Faulty PCB.
Troubleshooting
46
14.4.7 H28 (Outdoor Pipe Temperature Sensor Abnormality)
Malfunction Decision Conditions
• During startup and operation of cooling and heating, the temperatures detected by the outdoor pipe temperature
sensor are used to determine sensor errors.
Malfunction Caused
• Faulty connector connection.
• Faulty sensor.
• Faulty PCB.
Troubleshooting
47
14.4.8 H30 (Compressor Discharge Temperature Sensor Abnormality)
Malfunction Decision Conditions
• During startup and operation of cooling and heating, the temperatures detected by the outdoor discharge pipe
temperature sensor are used to determine sensor errors.
Malfunction Caused
• Faulty connector connection.
• Faulty sensor.
• Faulty PCB.
Troubleshooting
48
14.4.9 H33 (Unspecified Voltage between Indoor and Outdoor)
Malfunction Decision Conditions
• The supply power is detected for its requirement by the indoor/outdoor transmission.
Malfunction Caused
• Wrong models interconnected.
• Wrong indoor unit and outdoor unit PCBs used.
• Indoor unit or outdoor unit PCB defective.
Troubleshooting
49
14.4.10 H98 (Indoor High Pressure Protection)
Error Code will not display (no Timer LED blinking) but store in EEPROM
Malfunction Decision Conditions
• During heating operation, the temperature detected by the indoor pipe temperature sensor is above 140°F.
Malfunction Caused
• Clogged air filter of the indoor unit
• Dust accumulation on the indoor unit heat exchanger
• Air short circuit
• Detection error due to faulty indoor pipe temperature sensor
• Detection error due to faulty indoor unit PCB
Troubleshooting
50
14.4.11 H99 (Indoor Freeze Prevention Protection: Cooling or Soft Dry)
Malfunction Decision Conditions
• Freeze prevention control takes place (when indoor pipe temperature is lower than 35.6°F)
Malfunction Caused
• Clogged air filter of the indoor unit
• Dust accumulation on the indoor unit heat exchanger
• Air short circuit
• Detection error due to faulty indoor pipe temperature sensor
• Detection error due to faulty indoor unit PCB
Troubleshooting
51
14.4.12 F11 (Indoor Pipe Temperature Sensor Abnormality)
Malfunction Decision Conditions
• When cooling operation, when indoor pipe temperature or indoor heat exchanger temperature sensor is above
113°F.
Malfunction Caused
• Faulty connector connection.
• Faulty indoor pipe temperature sensor.
• Faulty indoor main PCB.
Troubleshooting
52
14.4.13 F90 (Power Factor Correction Protection)
Malfunction Decision Conditions
• During startup and operation of cooling and heating, when Power Factor Correction (PFC) protection circuitry at
the outdoor unit main PCB senses abnormal high DC voltage level.
Malfunction Caused
• DC voltage peak due to power supply surge.
• DC voltage peak due to compressor windings not uniform.
• Faulty outdoor PCB.
Troubleshooting
53
14.4.14 F91 (Refrigeration Cycle Abnormality)
Malfunction Decision Conditions
• During cooling, compressor frequency = Fcmax.
• During cooling and heating operation, running current: 0.65A < I < 1.65A.
• During cooling, indoor intake - indoor pipe < 39.2°F.
Malfunction Caused
• Refrigerant shortage (refrigerant leakage)
• Poor compression performance of compressor.
• 2/3 way valve closed.
• Detection error due to faulty indoor intake air or indoor pipe temperature sensors.
Troubleshooting
54
14.4.15 F93 (Compressor Rotation Failure)
Malfunction Decision Conditions
A compressor rotation failure is detected by checking the compressor running condition through the position
detection circuit.
Malfunction Caused
• Compressor terminal disconnect
• Outdoor PCB malfunction
Troubleshooting
55
14.4.16 F95 (Cooling High Pressure Abnormality)
Malfunction Decision Conditions
During operation of cooling, when outdoor unit heat exchanger high temperature data (141.8°F) is detected by the
outdoor pipe temperature sensor.
Malfunction Caused
• Outdoor pipe temperature rise due to short circuit of hot discharge air flow.
• Outdoor pipe temperature rise due to defective of outdoor fan motor.
• Outdoor pipe temperature rise due to defective outdoor pipe temperature sensor.
• Outdoor pipe temperature rise due to defective outdoor unit PCB.
Troubleshooting
56
14.4.17 F96 (IPM Overheating)
Malfunction Decision Conditions
During operating of cooling and heating, when IPM temperature data (212°F) is detected by the IPM temperature
sensor.
Malfunction Caused
• IPM overheats due to short circuit of hot discharge air flow.
• IPM overheats due to defective of outdoor fan motor.
• IPM overheats due to defective of internal circuitry of IPM.
• IPM overheats due to defective IPM temperature sensor.
Troubleshooting
57
14.4.18 F97 (Compressor Overheating)
Malfunction Decision Conditions
During operation of cooling and heating, when compressor tank temperature data (233.6°F) is detected by the
compressor tank temperature sensor.
Malfunction Caused
• Refrigerant shortage (refrigerant leakage).
• 2/3 way valve closed.
• Detection error due to faulty compressor tank temperature sensor.
Troubleshooting
58
14.4.19 F98 (Input Over Current Detection)
Malfunction Decision Conditions
During cooling and heating operation, when an input over-current (16.8A) is detected by checking the input current
value being detected by current transformer (CT) with the compressor running.
Malfunction Caused
• Over-current due to compressor failure.
• Over-current due to defective outdoor unit PCB.
• Over-current due to defective inverter main circuit electrolytic capacitor.
• Over-current due to excessive refrigerant.
Troubleshooting
59
14.4.20 F99 (Output Over Current Detection)
Malfunction Decision Conditions
During operation of cooling and heating, when an output over-current (18.5A) is detected by checking the current that
flows in the inverter DC peak sensing circuitry.
Malfunction Caused
• DC peak due to compressor failure.
• DC peak due to defective power transistor(s).
• DC peak due to defective outdoor unit PCB.
Troubleshooting
• Checking the power transistor
• Never touch any live parts for at least 10 minutes after turning off the circuit breaker.
• If unavoidable necessary to touch a live part, make sure the power transistor’s supply voltage is below 50V using
the tester.
• For the UVW, make measurement at the Faston terminal on the board of the relay connector.
Tester’s negative terminal Power transistor (+) UVW Power transistor (-) UVW
Tester’s positive terminal UVW Power transistor (+) UVW Power transistor (-)
Normal resistance Several kΩ to several MΩ
Abnormal resistance 0 or ∞
60
15. Disassembly and Assembly Instructions
High Voltage is generated in the electrical parts area by the capacitor. Ensure that the capacitor has discharged sufficiently before proceeding with
repair work. Failure to heed this caution may result in electric shocks.
15.1 Indoor Electronic Controllers, Cross Flow Fan and Indoor Fan Motor
Removal Procedures
15.1.1 To remove front grille
WARNING
15.1.1.1 To remove power electronic controller
61
15.1.1.2 To remove discharge grille
62
15.1.1.3 To remove control board
15.1.1.4 To remove cross flow fan and indoor fan motor
63
64
16. Technical Data
16.1 Operation Characteristics
16.1.1 CS-S18NKUA CU-S18NKUA
• Cooling Characteristic
o Room temperature: 81°F (DBT), 66°F (WBT)
o Operation condition: High fan speed
o Piping length: 24.6ft
o Compressor Freq: Fc
65
• Piping Length Characteristic
o Room temperature: 81°F (DBT), 66°F (WBT)
o Operation condition: High fan speed
o Outdoor temperature: 95°F (DBT)
o Compressor Freq: Fc
66
16.1.2 CS-S24NKUA CU-S24NKUA
• Cooling Characteristic
o Room temperature: 81°F (DBT), 66°F (WBT)
o Operation condition: High fan speed
o Piping length: 24.6ft
o Compressor Freq: Fc
67
• Piping Length Characteristic
o Room temperature: 81°F (DBT), 66°F (WBT)
o Operation condition: High fan speed
o Outdoor temperature: 95°F (DBT)
o Compressor Freq: Fc
68
17. Exploded View and Replacement Parts List
17.1 Indoor Unit
Note
The above exploded view is for the purpose of parts disassembly and replacement.
The non-numbered parts are not kept as standard service parts.
69
REF. NO. PART NAME & DESCRIPTION QTY. CS-S18NKUA CS-S24NKUA REMARK
1 CHASSIS COMPLETE 1 CWD50C1637 ←
2 FAN MOTOR 1 ARW7663AC ← O
3 CROSS-FLOW FAN COMPLETE 1 CWH02C1077 ←
4 BEARING ASSY 1 CWH64K007 ← O
5 SCREW - CROSS-FLOW FAN 1 CWH551146 ←
7 EVAPORATOR 1 CWB30C3963 CWB30C3967 O
8 FLARE NUT (LIQUID) 1 CWT251030 ←
9 FLARE NUT (GAS) 1 CWT251032 CWT251033
11 CLIP FOR SENSOR 1 CWH32143 ←
12 CONTROL BOARD CASING 1 CWH102505 ←
13 TERMINAL BOARD COMPLETE 1 CWA28C2357 ← O
14 ELECTRONIC CONTROLLER - MAIN 1 CWA73C6803 CWA73C6804 O
15 ELECTRONIC CONTROLLER - POWER 1 CWA746567 ← O
17 ELECTRONIC CONTROLLER - INDICATOR 1 CWA747108 ← O
19 SENSOR COMPLETE 1 CWA50C2989 ← O
20 CONTROL BOARD TOP COVER 1 CWH131350 ←
21 INDICATOR HOLDER 1 CWD933021 ←
22 CONTROL BOARD FRONT COVER CO. 1 CWH13C1201 ←
23 DISCHARGE GRILLE COMPLETE 1 CWE20C3049 ←
24 FULCRUM 2 CWH621103 ←
25 VERTICAL VANE 15 CWE241289 ←
26 CONNECTING BAR 1 CWE261156 ←
27 CONNECTING BAR 1 CWE261158 ←
28 CONNECTING BAR 1 CWE261157 ←
29 CONNECTING BAR 1 CWE261159 ←
30 CONNECTING BAR 1 CWE261160 ←
31 AIR SWING MOTOR 1 CWA98K1014 ←
32 AIR SWING MOTOR 1 CWA981241 ←
34 CAP - DRAIN TRAY 1 CWH521096 ←
35 HORIZONTAL VANE COMPLETE 1 CWE24C1295 ←
36 BACK COVER CHASSIS 1 CWD933031B ←
37 REMOTE CONTROL COMPLETE 1 CWA75C3582 ← O
38 FRONT GRILLE COMPLETE 1 CWE11C4514 ← O
39 INTAKE GRILLE COMPLETE 1 CWE22C1483 ←
40 GRILLE DOOR COMPLETE 1 CWE14C1029 ←
41 AIR FILTER 2 CWD001283 ← O
42 SCREW - FRONT GRILLE 4 XTT4+16CFJ ←
43 CAP - FRONT GRILLE 3 CWH521194 ←
44 DRAIN HOSE 1 CWH851173 ←
45 INSTALLATION PLATE 1 CWH361098 ←
46 BAG COMPLETE - INSTALLATION SCREW 1 CWH82C1705 ←
47 OPERATING INSTRUCTION 1 CWF568727 ←
48 INSTALLATION INSTRUCTION 1 CWF615168 ←
50 AIR PURIFYING FILTER 1 CWD00C1141 ← O
51 BAG 1 CWG861498 ←
52 SHOCK ABSORBER ( L ) 1 CWG713033 ←
53 SHOCK ABSORBER ( R ) 1 CWG713034 ←
54 C.C.CASE 1 CWG565069 ←
(Note)
• All parts are supplied from PAPAMY, Malaysia (Vendor Code: 00029488).
• “O” marked parts are recommended to be kept in stock.
70
17.2 Outdoor Unit
Note
The above exploded view is for the purpose of parts disassembly and replacement.
The non-numbered parts are not kept as standard service parts.
71
REF. NO. PART NAME & DESCRIPTION QTY. CU-S18NKUA CU-S24NKUA REMARK
1 CHASSIS COMPLETE 1 CWD52K1229A ←
2 ANTI - VIBRATION BUSHING 3 CWH50055 ←
3 COMPRESSOR 1 5KD240XAF21 ← O
4 NUT - COMPRESSOR MOUNT 3 CWH561049 ←
5 FAN MOTOR BRACKET 1 CWD541127 ←
6 FAN MOTOR 1 EHDS80CAC ← O
7 SCREW - FAN MOTOR BRACKET 3 CWH551217 ←
8 SCREW - FAN MOTOR MOUNT 4 CWH551323 ←
9 PROPELLER FAN ASSY 1 CWH00K1006 ←
10 NUT - PROPELLER FAN 1 CWH561092 ←
11 CONDENSER 1 CWB32C3516 ← O
12 EXPANSION VALVE 1 CWB051018J ← O
14 4-WAYS VALVE 1 CWB001057 ← O
16 HOLDER COUPLING 1 CWH351228A ←
17 3-WAY VALVE (GAS) 1 CWB011672 CWB011363 O
18 2-WAYS VALVE (LIQUID) 1 CWB021464 ← O
19 SOUND PROOF BOARD 1 CWH151197 ←
20 TERMINAL COVER 1 CWH171039A ←
21 NUT - TERMINAL COVER 1 CWH7080300J ←
22 V-COIL COMPLETE 1 CWA43C2393 ← O
23 SENSOR CO-COMP TEMP 1 CWA50C2689 ← O
24 SENSOR CO-AIR TEMP AND PIPE TEMP 1 CWA50C2710 ← O
25 REACTOR 1 G0C452J00002 ← O
26 CONTROL BOARD COVER-TOP 1 CWH131333 ←
27 TERMINAL BOARD ASSY 1 CWA28K1076J ← O
28 ELECTRONIC CONTROLLER - MAIN 1 CWA73C6798R CWA73C6799R O
29 CONTROL BOARD COVER-COMPLETE 1 CWH13C1210 ←
30 CABINET SIDE PLATE (LEFT) 1 CWE041490A ←
31 HANDLE 1 CWE161010 ←
32 CABINET SIDE PLATE 1 CWE041488A ←
33 CABINET FRONT PLATE CO. 1 CWE06K1070 ←
34 WIRE NET 1 CWD041128A ←
35 CABINET TOP PLATE 1 CWE031131A ←
38 SOUND PROOF MATERIAL 1 CWG302510 ←
39 SOUND PROOF MATERIAL 1 CWG302245 ←
40 SOUND PROOF MATERIAL 1 CWG302246 ←
41 CONTROL BOARD COVER 1 CWH131332 ←
42 BAG 1 CWG861154 ←
43 BASE BOARD/CC CASE-COMPLETE 1 CWG62C1082 ←
44 SHOCK ABSORBER (RIGHT) 1 CWG712879 ←
45 SHOCK ABSORBER (LEFT) 1 CWG712880 ←
46 C.C.CASE 1 CWG565614 ←
47 ELECTRONIC CONTROLLER-NF 1 CWA747077 ← O
48 TERMINAL BOARD ASSY 1 CWA28K1277 ← O
49 CAPILLARY TUBE ASSY 1 CWT01C6093 ← O
50 HEATER 1 CWA341067 ← O
51 PACKING 3 CWB81043 ←
(Note)
• All parts are supplied from PAPAMY, Malaysia (Vendor Code: 00029488).
• “O” marked parts are recommended to be kept in stock.
Printed in Malaysia
SB0412-0
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