Panasonic CS-E18EKU User manual

1 Safety Precautions 3
2 Specification 5
2.1. CS-E18EKU CU-E18EKU 5
2.2. CS-E21EKU CU-E21EKU 7
3 Location of controls and components 9
3.1. Indoor Unit 9
3.2. Outdoor Unit 9
3.3. Remote Control 9
4 Dimension 10
4.1. Indoor Unit & Remote Control 10
4.2. Outdoor Unit 11
5 Refrigeration Cycle Diagram 12
6 Block Diagram 13
7 Wiring Diagram 14
7.1. CS-E18EKU CS-E21EKU 14
7.2. CU-E18EKU CU-E21EKU 15
© 2005 Panasonic HA Air-Conditioning (M) Sdn Bhd
(11969-T). All rights reserved. Unauthorized copying
and distribution is a violation of law.
CS-E18EKU CU-E18EKU
CS-E21EKU CU-E21EKU
8 Printed Circuit Board 16
8.1. Indoor Unit 16
8.2. Outdoor Unit 17
9 Installation Instructions 18
9.1. Select The Best Location 18
9.2. Indoor Unit 19
9.3. Outdoor Unit 23
10 Operation And Control 26
10.1. Basic Function 26
10.2. Protection Control 31
11 Servicing Mode 33
11.1. Auto Switch Operation 33
11.2. Indicator Panel 33
12 Troubleshooting Guide 34
12.1. Refrigeration Cycle System 34
Air Conditioner
CONTENTS
Page Page
Order No: MAC0512115C1

12.2. Relationship Between The Condition Of The Air
Conditioner And Pressure And Electric Current 35
12.3. Breakdown Self Diagnosis Function 36
12.4. Error Codes Table 37
13 Disassembly and Assembly Instructions 38
13.1. Indoor Electronic Controller and Control Board 38
13.2. Indoor Cross Flow Fan and Fan Motor 41
13.3. Outdoor Propeller Fan and Fan Motor 42
14 Technical Data 44
14.1. CS-E18EKU CU-E18EKU 44
14.2. CS-E21EKU CU-E21EKU 52
15 Exploded View And Replacement Parts List 60
15.1. CS-E18EKU CS-E21EKU 60
15.2. CS-E18EKU CS-E21EKU 61
15.3. CU-E18EKU CU-E21EKU 62
15.4. CU-E18EKU CU-E21EKU 63
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CS-E18EKU CU-E18EKU / CS-E21EKU CU-E21EKU

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.
This indication shows the possibility of causing death or serious injury.
This indication shows the possibility of causing injury or damage to properties.
• The items to be followed are classified by the symbols:
This symbol denotes item that is PROHIBITED from doing.
• 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. Engage dealer or specialist for installation and servicing. If installation or servicing done by the user is defective, it will cause water
leakage, electrical shock or fire.
2. Install according to this installation instruction strictly. If installation is defective, it will cause water leakage, electrical shock or fire.
3. Use the attached accessories parts and specified parts for installation and servicing. Otherwise, it will cause the set to fall, water
leakage, fire or electrical shock.
4. 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
done, the set will drop and cause injury.
5. For electrical work, follow the local national wiring standard, regulation and the installation instruction. An independent circuit and single
outlet must be used. If electrical circuit capacity is not enough or defect found in electrical work, it will cause electrical shock or fire.
6. Use the specified cable and connect tightly for indoor/outdoor connection. Connect tightly and 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.
7. Wire routing must be properly arranged so that control board cover is fixed properly. If control board cover is not fixed perfectly, it will
cause heat-up at connection point of terminal, fire or electrical shock.
8. When connecting the piping, do not allow air or any substances other than the specified refrigerant to enter the
refrigeration cycle. Otherwise, this may lower the capacity, cause abnormally high pressure in the refrigeration cycle, and
possibly result in explosion and injury.
9. Thickness of copper pipes used must be more than 10/32 inches. Never use copper pipes thinner than 10/32 inches.
10. It is desirable that the amount of residual oil is less than 40 mg/10 m.
11. Do not modify the length of the power supply cord or use of the extension cord, and do not share the single outlet with
other electrical appliances. Otherwise, it will cause fire or electrical shock.
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CS-E18EKU CU-E18EKU / CS-E21EKU CU-E21EKU

1. The equipment must be earthed. It may cause electrical shock if grounding is not perfect.
2. Do not install the unit at place where leakage of flammable gas may occur. In case gas leaks and accumulates at
surrounding of the unit, it may cause fire.
3. Carry out drainage piping as mentioned in installation instructions. If drainage is not perfect, water may enter the room and damage the
furniture.
4. Pb free solder has a higher melting point than standard solder; typically the melting point is 50 - 70°F (30 - 40°C) higher. Please use a
high temperature soldering 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).
1. Selection of the installation location. Select an installation location which is rigid and strong enough to support or hold the unit, and select
a location for easy maintenance.
2. 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.
1.Power supply connection to the receptacle using a power plug. Use an approved power plug with earth pin for the connection to the
socket.
2.Power supply connection to a circuit breaker for the permanent connection. Use an approved circuit breaker for the permanent
connection. It must be a double pole switch with a minimum 4/32 inches contact gap.
3. Do not release refrigerant during piping work for installation, servicing, reinstallation and during repairing a refrigeration parts. Take care
of the liquid refrigerant, it may cause frostbite.
4. Installation work. It may need two people to carry out the installation work.
5. Do not install this appliance in a laundry room or other location where water may drip from the ceiling, etc.
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2 Specification
2.1. CS-E18EKU CU-E18EKU
Unit CS-E18EKU CU-E18EKU
Performance Test Condition CSA
Cooling Capacity kW
BTu/h 5.20 (1.30 - 5.80) 17,700 (4,400 - 19,700)
Heating Capacity kW
BTu/h 6.30 (1.30 - 7.70) 21,400 (4,400 - 19,700)
Moisture Removal l/h
Pint/h 1.8 3.8
Power Source (Phase, Voltage, Cycle) ø
V
Hz
Single
208 - 230
60
Airflow Method OUTLET
INTAKE
SIDE VIEW TOP VIEW
Air Volume Lo m3/min (cfm) Cooling; 11.0 (389) —
Heating; 12.3 (443)
Me m3/min (cfm) Cooling; 12.2 (432) —
Heating; 14.1 (497)
Hi m3/min (cfm) Cooling; 13.5 (480) Cooling; 40.0 (1,410)
Heating; 15.9 (560) Heating; 40.0 (1,410)
SHi m3/min (cfm) — —
dB (A) Cooling; High 45, Low 39 Cooling; 47 - 47
Heating; High 46, Low 39 Heating; 47 - 47
Noise Level
Power level dB Cooling; High 58 - 58 Cooling; High 60 - 60
Heating; High 59 - 59 Heating; High 60 - 60
Electrical Data Input W Cooling; 1.60k (250 - 1.8k)
Heating; 1.85k (250 - 2.50k)
Running Current ACooling; 7.9
Heating; 9.2
EER W/W (kcal/hw) Cooling; 3.25 (11.06)
COP W/W (kcal/hw) Heating; 3.41 (11.57)
Starting Current A 9.2
SEER/HSPF W/W 16.50 7.70
Piping Connection Port
(Flare piping) inch inch G ; Half Union 1/2” L ; Half Union 1/4” G ; 3-way valve 1/2” L ; 2-way valve 1/4”
Pipe Size
(Flare piping) inch inch G (gas side) ; 1/2” L (liquid side) ; 1/4” G (gas side) ; 1/2” L (liquid side) ; 1/4”
Drain
Hose Inner diameter inch 20/32” —
Length inch 25 - 19/32” —
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Unit CS-E18EKU CU-E18EKU
Power Cord Length
Number of core-wire inch 70 - 29/32” (1.5mm2)— —
Dimensions Height inch (mm) 10 - 13/16 (275) 29 - 17/32 (750)
Width inch (mm) 39 - 9/32 (998) 34 - 7/16 (875)
Depth inch (mm) 9 - 1/16 (230) 13 - 19/32 (345)
Net Weight lb (kg) 24 (11.0) 108 (49.0)
Compressor Type — Hermetic Motor
Motor Type — Brushless (4-pole)
Rated Output W — 900
Fan Motor Type Cross-flow Fan Propeller Fan
Material ASHT-18 P.P
Motor Type Transistor (8-poles) PWM (8-poles)
Input W 61.6 62.1
Rate Output W 30 40
Fan Speed Lo (Cool/Heat) rpm 1,190/1,280 —
Me (Cool/Heat) rpm 1,325/1,470 —
Hi (Cool/Heat) rpm 1,460/1,660 660/640
SHi (Cool/Heat) rpm — —
Heat Exchanger Description Evaporator Condenser
Tube material Copper Copper
Fin material Aluminium (Pre Coat) Aluminium (Blue Coat)
Fin Type Slit Fin Corrugated Fin
Row / Stage (Plate fin configuration, forced draft)
2/15 2/34
FPI 21 16
Size (W × H × L) inch 2 - 1/32 × 1 - 13/32 × 1 1 - 14/32 × 19 - 27/32 × 33 - 2/32
34 - 2/32
Refrigerant Control Device —Capillary Tube
Refrigeration Oil (inch3) — RB68A (24.4)
Refrigerant (R410A) g (oz) — 930 (32.8)
Thermostat Electronic Control —
Protection Device — Electronic Control
Air Filter Material
Style P.P. Honeycomb —
•
Specifications are subjected to change without prior notice for further improvement.
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CS-E18EKU CU-E18EKU / CS-E21EKU CU-E21EKU

2.2. CS-E21EKU CU-E21EKU
Unit CS-E21EKU CU-E21EKU
Performance Test Condition CSA
Cooling Capacity kW
BTu/h 6.10 (1.30 - 6.85) 20,800 (4,400 - 23,400)
Heating Capacity kW
BTu/h 6.90 (1.30 - 8.30) 23,400 (4,400 - 28,200)
Moisture Removal l/h
Pint/h 2.6 5.5
Power Source (Phase, Voltage, Cycle) ø
V
Hz
Single
208 - 230
60
Airflow Method OUTLET
INTAKE
SIDE VIEW TOP VIEW
Air Volume Lo m3/min (cfm) Cooling; 11.4 (404) —
Heating; 12.6 (445)
Me m3/min (cfm) Cooling; 13.1 (462) —
Heating; 14.5 (513)
Hi m3/min (cfm) Cooling; 14.7 (520) Cooling; 42.8 (1,510)
Heating; 16.5 (580) Heating; 41.5 (1,460)
SHi m3/min (cfm) — —
dB (A) Cooling; High 46, Low 39 Cooling; 48 - 48
Heating; High 47, Low 39 Heating; 49 - 49
Noise Level
Power level dB Cooling; High 59 Cooling; High 61
Heating; High 60 Heating; High 62
Electrical Data Input W Cooling; 2.15k (250 - 2.45k)
Heating; 2.15k (250 - 2.60k)
Running Current ACooling; 10.7 - 9.7
Heating; 10.7 - 9.7
EER W/W (kcal/hw) Cooling; 2.84 (9.67)
COP W/W (kcal/hw) Heating; 3.21 (10.88)
Starting Current A 10.7
SEER/HSPF W/W 16.50 7.70
Piping Connection Port
(Flare piping) inch inch G ; Half Union 1/2” L ; Half Union 1/4” G ; 3-way valve 1/2” L ; 2-way valve 1/4”
Pipe Size
(Flare piping) inch inch G (gas side) ; 1/2” L (liquid side) ; 1/4” G (gas side) ; 1/2” L (liquid side) ; 1/4”
Drain
Hose Inner diameter inch 20/32” —
Length inch 25 - 19/32” —
Power Cord Length
Number of core-wire 70 - 29/32” (1.5mm2)— —
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CS-E18EKU CU-E18EKU / CS-E21EKU CU-E21EKU

Unit CS-E21EKU CU-E21EKU
Dimensions Height inch (mm) 10 - 13/16 (275) 29 - 17/32 (750)
Width inch (mm) 39 -9/32 (998) 34 - 7/16 (875)
Depth inch (mm) 9 - 1/16 (230) 13 - 19/32 (345)
Net Weight lb (kg) 20 (9.0) 79 (36)
Compressor Type — Hermetic Motor
Motor Type — Brushless (4-pole)
Rated Output W — 900
Fan Motor Type Cross-flow Fan Propeller Fan
Material ASHT-18 P.P
Motor Type Transistor (8-poles) PWM (8-poles)
Input W 61.6 74.8
Rate Output W 30 40
Fan Speed Lo (Cool/Heat) rpm 1,200/1,290 —
Me (Cool/Heat) rpm 1,370/1,490 —
Hi (Cool/Heat) rpm 1,540/1,690 700 / 680
SHi (Cool/Heat) rpm — —
Heat Exchanger Description Evaporator Condenser
Tube material Copper Copper
Fin material Aluminium (Pre Coat) Aluminium (Blue Coat)
Fin Type Slit Fin Corrugated Fin
Row / Stage (Plate fin configuration, forced draft)
2/15 2/34
FPI 21 18
Size (W × H × L) inch 2 - 1/32 × 1 - 13/32 × 1 1 - 14/32 × 19 - 27/32 × 33 - 2/32
34 - 2/32
Refrigerant Control Device —Capillary Tube
Refrigeration Oil (inch3) — RB68A (24.4)
Refrigerant (R410A) g (oz) — 1.29k (45.5)
Thermostat Electronic Control —
Protection Device — Electronic Control
Air Filter Material
Style P.P. Honeycomb —
•
Specifications are subjected to change without prior notice for further improvement.
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CS-E18EKU CU-E18EKU / CS-E21EKU CU-E21EKU

3 Location of controls and components
3.1. Indoor Unit
3.2. Outdoor Unit
3.3. Remote Control
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CS-E18EKU CU-E18EKU / CS-E21EKU CU-E21EKU

4 Dimension
4.1. Indoor Unit & Remote Control
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4.2. Outdoor Unit
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5 Refrigeration Cycle Diagram
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6 Block Diagram
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7 Wiring Diagram
7.1. CS-E18EKU CS-E21EKU
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7.2. CU-E18EKU CU-E21EKU
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CS-E18EKU CU-E18EKU / CS-E21EKU CU-E21EKU

8.1. Indoor Unit
8 Printed Circuit Board
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8.2. Outdoor Unit
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CS-E18EKU CU-E18EKU / CS-E21EKU CU-E21EKU

INDOOR UNIT
• 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 the door way.
• 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”.
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 rated length, additional
refrigerant should be added as shown in the table.
Model Piping size Rated
Length Max.
Elevation Max.
Piping
Length
Additional
Refrigerant
Gas Liquid
E18EK
E21EK 1/2” 1/4” 16.4ft (5m) 49.2ft (15m) 65.6ft (20m) 0.22oz/ft (20g/m)
Indoor/Outdoor Unit Installation Diagram
• This illustration is for explanation purposes only.
The indoor unit will actually face a different way.
9 Installation Instructions
9.1. Select The Best Location
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CS-E18EKU CU-E18EKU / CS-E21EKU CU-E21EKU

9.2.1. HOW TO FIX INSTALLATION
PLATE
The mounting wall is strong and solid enough to prevent it from
the vibration.
The wall must be able to withstand the weight of the unit.
The centre of installation plate should be at more than
21-21/32” at right and left of the wall.
The distance from installation plate edge to ceiling should more
than 2-5/8”.
From installation plate left edge to unit’s left side is 1-27/32”.
From installation plate right edge to unit’s right is 2-7/8”.
:
:
:
For left side piping, piping connection for liquid should be
about 4-31/32” from this line.
For left side piping, piping connection for gas should be
about 6-27/32” from this line.
For left side piping, piping connection cable should be
about 38-3/4” from this line.
1.Mount the installation plate on the wall with 5 screws or
more.
(If mounting the unit on the concrete wall consider using
anchor bolts.)
• 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 ø2-3/4” hole-core drill.
• Line according to the arrows marked on the lower left
and right side of the installation plate. The meeting point
of the extended line is the centre of the hole. Another
method is to put measuring tape at position as shown in
the diagram above. The hole centre is obtained by
measuring the distance namely 5-29/32” and 4-29/32”
for left and right hole respectively.
• Drill the piping hole at either the right or the left and the
hole should be slightly slanted to the outdoor side.
9.2.2. 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.
Caution
When the wall is hollow, please be sure to use the
sleeve for tube assembly to prevent dangers caused by
mice biting the connecting cable.
4.Finish by sealing the sleeve with putty or caulking
compound at the final stage.
9.2.3. INDOOR UNIT INSTALLATION
1.For the right rear piping
2.For the right and right bottom piping
9.2. Indoor Unit
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3.For the embedded piping
(This can be used for left rear piping and left bottom piping
also.)
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CS-E18EKU CU-E18EKU / CS-E21EKU CU-E21EKU