Panasonic CS-E18EKU, CU-E18EKU, CU-E21EKU, CS-E21EKU Service 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 Disassem bly 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
2
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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CS-E18EKU CU-E18EKU / CS-E21EKU CU-E21EKU
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 A Cooling; 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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CS-E18EKU CU-E18EKU / CS-E21EKU CU-E21EKU
Unit CS-E18EKU CU-E18EKU
Power Cord Length
Number of core-wire
inch 70 - 29/32”
(1.5mm
2
)
—
—
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.
6
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 A Cooling; 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”
(1.5mm
2
)
—
—
7
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.
8
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
9
CS-E18EKU CU-E18EKU / CS-E21EKU CU-E21EKU
4 Dimension
4.1. Indoor Unit & Remote Control
10
CS-E18EKU CU-E18EKU / CS-E21EKU CU-E21EKU
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