Panasonic CU-2S18NBU-1 User Manual

Order No: PHAAM1111121A1

Outdoor Unit CU-2S18NBU-1

Please file and use this manual together with the service manual for Model No. CS-S9NKUW-1, CS-S12NKUW-1 Order No. PHAAM1111084C1

WARNING

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 product or products dealt with in this service information by anyone else could result in serious injury or death.

In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerantion circuit.

PRECAUTION OF LOW TEMPERATURE

TABLE OF CONTENTS

1. Safety Precautions.............................................3

2. Specification.......................................................5

3. Dimensions.........................................................7

4. Refrigeration Cycle Diagram.............................8

5. Block Diagram....................................................9

6. Wiring Connection Diagram............................10

7. Electronic Circuit Diagram..............................11

8. Printed Circuit Board.......................................12

8.1 Main Printed Circuit Board .........................12

8.2 Noise Filter Printed Circuit Board...............13

9. Installation Information ...................................14

9.1 Check Points ..............................................14

10. Installation Instruction.....................................15

10.1 SELECT THE BEST LOCATION ...............15

10.2 INSTALL THE OUTDOOR UNIT................17

10.3 CONNECT THE PIPING............................17

10.4 EVACUATION OF THE EQUIPMENT.......18

10.5 CONNECT THE CABLE TO THE

OUTDOOR UNIT........................................18

10.6 HEAT INSULATION ...................................19

11. Operation Control.............................................20

12.12

Valve close detection control......................23

12.13 Compressor discharge high pressure

protection control ........................................23

13. Servicing Mode.................................................24

13.1 Pump Down Operation ...............................24

13.2 Test Operation............................................24

13.3 Wiring Error Check .....................................24

13.4 Power Save Mode ......................................25

13.5 Mode priority function .................................25

14. Troubleshooting Guide....................................26

14.1 Self Diagnosis Function..............................26

15. Disassembly and Assembly Instructions ......28

15.1 Outdoor Unit Removal Procedure ..............28

16. Technical Data ..................................................31

16.1 Operation Characteristics...........................31

17. Exploded View and Replacement Parts List..41

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 running 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 or 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).

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 specified indoor / outdoor connection cable, refer to Installation

10.

Instructions 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 connection 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 refrigerant 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

13. climb up 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

17. flare may break and cause refrigerant gas leakage.

For R410A models, when connecting the piping, do not use any existing (R22) pipes and flare nuts. Using such same may cause abnormally high pressure in the refrigeration cycle (piping), and possibly result in explosion and injury. Use only R410A materials.

18.

Thickness of copper pipes used with R410A must be more than 0.8mm (1/32”). Never use copper pipes thinner than 0.8mm (1/32”). It is desirable that the amount of residual oil is less than 40 mg/10m (0.0008 oz/ft).

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.).

WARNING

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. Power supply cord shall be UL listed or CSA approved 4 conductors with minimum AWG12 wires. Power supply point should be in an easily accessible place for power disconnection in case of emergency.

7. In some countries, permanent connection of this air conditioner to the power supply is prohibited.

Fix power supply connection to a circuit breaker for the permanent connection. Use NRTL approved fuse or circuit breaker (rating refers to name plate) for the permanent connection.

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 fin, sharp parts may cause injury.

2. Specification

Model Outdoor Unit CU-2S18NBU-1

Indoor Unit Combination 3.2kW + 3.2kW

Power Source

Capacity

Running Current A 7.6 - 6.9

Cooling Operation

Maximum Current A 13.6

Starting Current A 7.8

Minimum Circuit Ampacity A 20

Dimension

Connection Cable 3 + 1 (Earth) ø1.5 mm2

Pipe Length Range (1 room) m (ft) 3 ~ 25 (9.8 ~ 82.0)

Maximum Pipe Length (Total Room) m (ft) 50 (164.0)

Refrigerant Pipe Diameter

Compressor

Air Circulation

Fan Speed High RPM 650

Heat Exchanger

Air Volume High m3/min (ft3/min) 37.2 (1313)

Refrigerant Control Device Expansion Valve

Refrigerant Oil FV50S

Refrigerant (R410A) g (oz) 1.92k (67.8)

Indoor Operation Range Cooling

Outdoor Operation Range Cooling

Electrical

Data

Noise

Net Weight kg (Ib) 69 (152)

Rated Output W 1.30k

Rated Output W 60

Tube Material Copper

Dry Bulb Wet Bulb

Power Input kW 1.45 (0.39 ~ 1.84)

EER W/W 3.37 (5.38 ~ 3.18)

BTU/hW 11.50 (18.45 ~ 10.85)

Sound Pressure Level dB-A 48

Sound Power Level dB 62

Height mm (inch) 795 (31-5/16)

Width mm (inch) 875 + 95 (34-15/32 + 3-3/4)

Depth mm (inch) 320 (12-5/8)

Liquid Side mm (inch) 6.35 (1/4)

Gas Side mm (inch) 9.52 (3/8)

Type Hermetic (Rotary)

Motor Type DC Brushless (4-poles)

Type Propeller Fan

Motor Type DC Brushless (8-poles)

Type Plate fin configuration forced draft type

Fin Material Aluminum

Row/Stage 2/36

FPI 19

Maximum °F 89.6 73.4

Minimum °F 60.8 51.8

Maximum °F 109.4 78.8

Minimum °F 60.8 51.8

kW 4.89 (2.10 ~ 5.86)

BTU/h 16700 (7200 ~ 20000)

Note

• Specifications are subject to change without notice for further improvement.

1 Phase, 208-230V, 60Hz

(Power supply from outdoor unit)

• Multi split combination possibility:

o A single outdoor unit enables air conditioning of up to two separate rooms for CU-2S18NBU-1.

Outdoor Unit CU-2S18NBU-1 A B

2.8 kW CS-S9NKUW-1 ● ●

Wall

Capacity range of connectable indoor units From 5.6 kW to 6.4 kW

1 room maximum pipe length (m (ft)) 25 (82.0) Allowable elevation (m (ft)) 15 (49.2) Total allowable pipe length (m (ft)) 50 (164.0) Total pipe length for maximum chargeless length (m (ft)) 20 (65.6)

Piping Length

Additional gas amount over chargeless length (g/m (oz/ft)) 20 (0.2)

Remarks for CU-2S18NBU-1

1. At least two indoor units must be connected.

2. The total nominal cooling capacity of indoor unit that will be connected to outdoor unit must be within connectable capacity range of indoor unit.

(as shown in the table above) Example: The indoor units’ combination below is possible to connect to CU-2S18NBU-1. (Total nominal capacity of indoor units is between 5.6 kW to 6.4 kW)

1) Two CS-S9NKUW-1 only. (Total nominal cooling capacity is 5.6 kW)

2) One CS-S9NKUW-1 and one CS-S12NKUW-1. (Total nominal cooling capacity is 6.0 kW)

3.2 kW CS-S12NKUW-1 ● ●

Note: “●” : Available

Outdoor Unit

CU-2S18NBU-1

Indoor unit combination Capacity (kW) Input Power (W)

Operation Class (kW)

One-room Operation

Two-room Operation

2.8 2.82 1.81 ~ 3.27 850 390 ~ 1020 4.5 4.1 0.5

3.2

2.8 + 2.8 4.89 2.09 ~ 5.86 1450 390 ~ 1920 7.6 6.9 0.5 + 0.5

2.8 + 3.2 4.89 2.10 ~ 5.86 1450 390 ~ 1870 7.6 6.9 0.5 + 0.6

3.2 + 3.2

Operation

Mode

Cooling

Rating Min - Max Rating Min - Max

3.21 1.85 ~ 3.75 1000 390 ~ 1230 5.2 4.7 0.6

4.89 2.10 ~ 5.86 1450 390 ~ 1840 7.6 6.9 0.6 + 0.6

Current (A)

208V 60Hz

Current (A)

230V 60Hz

Moisture Removal

Volume (L/h)

Outdoor Unit

CU-2S18NBU-1

Indoor unit combination Capacity (BTU/h) Input Power (W)

Operation Class (kW)

One-room Operation

Two-room Operation

2.8 9600 6200 ~ 11200 850 390 ~ 1020 4.5 4.1 1.1

3.2

2.8 + 2.8 16700 7100 ~ 20000 1450 390 ~ 1920 7.6 6.9 1.1 + 1.1

2.8 + 3.2 16700 7200 ~ 20000 1450 390 ~ 1870 7.6 6.9 1.1 + 1.3

3.2 + 3.2

Operation

Mode

Cooling

Rating Min - Max Rating Min - Max

10900 6300 ~ 12800 1000 390 ~ 1230 5.2 4.7 1.3

16700 7200 ~ 20000 1450 390 ~ 1840 7.6 6.9 1.3 + 1.3

Current (A)

208V 60Hz

Current (A)

230V 60Hz

Moisture Removal

Volume (Pt/h)

• Specifications are subject to change without notice for further improvement.

3. Dimensions

4. Refrigeration Cycle Diagram

5. Block Diagram

6. Wiring Connection Diagram

7. Electronic Circuit Diagram

8. Printed Circuit Board

8.1 Main Printed Circuit Board

8.2 Noise Filter Printed Circuit Board

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