Panasonic CS-S24NKUA, CS-S18NKUA, CU-S18NKUA, CU-S24NKUA User Manual

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

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

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.

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

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.

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.

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 / -

/min (ft3/min) 18.97 (670) 20.07 (709)

/min (ft3/min) 54.5 (1925) 54.5 (1925) 54.5 (1925) 54.5 (1925)

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)

3. Location of Controls and Components

3.1 Indoor Unit

3.2 Outdoor Unit

3.3 Remote Control

4. Dimensions

4.1 Indoor Unit

4.2 Outdoor Unit

5. Refrigeration Cycle Diagram

6. Block Diagram

7. Wiring Connection Diagram

7.1 Indoor Unit

7.2 Outdoor Unit

8. Electronic Circuit Diagram

8.1 Indoor Unit

8.2 Outdoor Unit

9. Printed Circuit Board

9.1 Indoor Unit

9.1.1 Main Printed Circuit Board

9.1.2 Power Printed Circuit Board

9.1.3 Indicator Printed Circuit Board

9.2 Outdoor Unit

9.2.1 Main Printed Circuit Board

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

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”

○

○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.

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.)

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.

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