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- Panasonic
- Air Conditioner
- CS-A18EKH
- Service Manual
Panasonic CS-A18EKH Service Manual - page 26
26
1) Measure the pressure.
2) Keep it for 5-10 minutes
•
Ensure if the pressure indicated on the gauge is as same as that of measured at first time.
2) Air purging
The air remaining in the Refrigeration cycle which contains
moisture may cause malfunction on the Compressor.
1. To purge the air, push the pin on the Gas side 3-way
valve for three seconds with a Hexagonal wrench and set
it free for one minute.
• Repeat this for three times.
2. To balance the refrigerant, close the low pressure side
valve on the Manifold gauge and release refrigerant from
the piping through service port until the gauge indicates
0.5 - 0.3 MPa.
3. Set both 3-way valves to open position with the
Hexagonal wrench for the unit operation.
10.2.4. CONNECT THE CABLE TO THE OUTDOOR UNIT
1. Remove the control board cover from the unit by loosening the screw.
2. Connecting cable between indoor unit and outdoor unit shall be approved polychloroprene sheathed 3
×
2.5 mm
2
(C18EK,
C24EK, RS/RU-C18/24EK) or 5
×
2.5 mm
2
(A18EK, A24EK) flexible cord, type designation 245 IEC 57 or heavier cord.
3. Secure the cable onto the control board with the holder (clamper).
4. Attach the control board cover to the original position with the screw.
Summary of CS-A18EKH
Page 1
© 2005 panasonic ha air-conditioning (m) sdn bhd (11969-t). All rights reserved. Unauthorized copying and distribution is a violation of law. Order no. Mac0511090c3 air conditioner cs-a18ekh cu-a18ekh cs-a24ekh cu-a24ekh table of contents page page 1 safety precaution -------------------------------...
Page 2
2 11.15. Auto refresh deo ---------------------------------------- 44 12 servicing mode -------------------------------------------------- 45 12.1. Auto off/on button ------------------------------------ 45 12.2. Remote control button --------------------------------- 45 12.3. Test mode timer table-...
Page 3: 1 Safety Precaution
3 1 safety precaution • 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 ...
Page 4
4 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 i...
Page 5: 2 Specifications
5 2 specifications 2.1. Cs-a18ekh cu-a18ekh unit cs-a18ekh cu-a18ekh performance test condition new jis power source (phase, voltage, cycle) ø, v, hz single, 220 - 240, 50 cooling capacity kw (btu/h) 5.40 (18,400) - 5.40 (18,400) heating capacity kw (btu/h) 5.90 (20,100) - 6.00 (20,500) moisture rem...
Page 6
6 note • specifications are subject to change without notice for further improvement. Compressor description — rotary (1 cylinder) rolling piston type motor type — induction (2-poles) rated output kw — 1.5 air circulation description cross-flow fan propeller fan material asht-18 pp motor type transi...
Page 7
7 2.2. Cs-a24ekh cu-a24ekh unit cs-a24ekh cu-a24ekh performance test condition new jis power source (phase, voltage, cycle) ø, v, hz single, 220 - 240, 50 cooling capacity kw (btu/h) 7.03 - 7.03 (24,000 - 24,000) heating capacity kw (btu/h) 7.80 - 7.80 (26,600 - 26,600) moisture removal l/h (pint/h)...
Page 8
8 note • specifications are subject to change without notice for further improvement. Air circulation description cross-flow fan propeller fan material asht-18 pp motor type transistor (8-poles) induction (6-poles) input w — 116 - 127 rated output w 30 80 fan speed low rpm cooling; 1,280 - 1,280 hea...
Page 9: 3 Features
9 3 features • high efficiency. • compact design. • wider range of horizontal discharge air. • air filter with function to reduce dust and smoke. • automatic air swing and manual adjusted by remote control for horizontal and vertical airflow. • long installation piping up to 25 meter. • supersonic a...
Page 10
10 4 location of controls and components 4.1. Product overview 4.1.1. Indoor unit 4.1.2. Outdoor unit 4.1.3. Remote control.
Page 11: 5 Dimensions
11 5 dimensions 5.1. Indoor unit.
Page 12
12 5.2. Outdoor unit.
Page 13
13 6 refrigeration cycle diagram.
Page 14: 7 Block Diagram
14 7 block diagram.
Page 15: 8 Wiring Connection Diagram
15 8 wiring connection diagram.
Page 16: 9 Printed Circuit Board
16 9 printed circuit board 9.1. Indoor unit (main printed circuit board).
Page 17
17.
Page 18
18 9.2. Indoor unit (power printed circuit board).
Page 19
19 9.3. Outdoor unit (main printed circuit board).
Page 20
20 9.4. Indicator panel.
Page 21: 10 Installation Instruction
21 10 installation instruction 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 preventio...
Page 22
22 10.1. Indoor unit 10.1.1. How to fix installation plate the mounting wall is strong and solid enough to prevent it from the vibration. The centre of installation plate should be at more than 550 mm at right and left of the wall. The distance from installation plate edge to ceiling should more tha...
Page 23
23 3. For the embedded piping (this can be used for left rear piping and left bottom piping also.).
Page 24
24 10.1.4. Connect the cable to the indoor unit 1. The inside and outside connecting cable can be connected without removing the front grille. 2. Connecting cable between indoor unit and outdoor unit shall be approved polychloroprene sheathed 3 × 2.5 mm 2 (c18ek, c24ek, rs/ru-c18/24ek) or 5 × 2.5 mm...
Page 25
25 10.2. Outdoor unit 10.2.1. Install the outdoor unit • after selecting the best location, start installation according to indoor/outdoor unit installation diagram. 1. Fix the unit on concrete or rigid frame firmly and horizontally by bolt nut (ø10 mm). 2. When installing at roof, please consider s...
Page 26
26 1) measure the pressure. 2) keep it for 5-10 minutes • ensure if the pressure indicated on the gauge is as same as that of measured at first time. 2) air purging the air remaining in the refrigeration cycle which contains moisture may cause malfunction on the compressor. 1. To purge the air, push...
Page 27: 11 Operation and Control
27 11 operation and control 11.1. Heating operation • heating operation can be set using remote control. • this operation is applied to warm the room temperature reaches the setting temperature set on the remote control. • the remote control setting temperature, which takes the reading of intake air...
Page 28
28 11.2. Cooling operation • cooling operation can be set using remote control. • this operation is applied to cool down the room temperature reaches the setting temperature set on the remote control. • the remote control setting temperature, which takes the reading of intake air temperature sensor,...
Page 29
29 11.3. Soft dry operation • soft dry operation can be set using remote control. • soft dry operation is applied to dehumidify and to perform a gentle cooling to the room. • this operation starts when the intake air temperature sensor reaches the setting temperature on the remote control. • when op...
Page 30
30 11.4. Automatic operation • automatic operation can be set using remote control. • this operation starts to operate with indoor fan at slo speed for 25 seconds to judge the intake air temperature. • after judged the temperature, the operation mode is determined by referring to the below standard....
Page 31
31 • the operation mode judging temperature and standard setting temperature can be increased by 2°c permanently, by open the circuit of jx03 at printed circuit board indoor unit. 11.5. Operation control (for 11.5.1. To 11.5.7. Information applies only to cooling and soft dry operation) 11.5.1. Rest...
Page 32
32 11.5.4. Anti-freezing control • if the temperature of the indoor heat exchanger falls below 2 ° c continuously for 4 minutes or more, the compressor turns off. The fan speed setting remains the same. • this phenomenon is to protect the indoor heat exchanger from freezing and to prevent higher vol...
Page 33
33 b. Qlo fan speed dew formation may occurs at qlo cool, therefore qlo cool is operated only 1 hr 30 min (1 hr qlo, 30 min qlo +100 rpm). After that, it operates at qlo +180rpm (however quiet led remains on). 2. Norrowing vertical airflow direction – during anti-dew condensation prevention, airflow...
Page 34
34 – during anti-dew condensation prevention, airflow direction manual control angle change from 0°, 11°, 22°, 33°, 44° to 14°, 18°, 22°, 26°, 30° under cooling and soft dry operation mode. (for 11.5.8 to 11.5.14 information applies only to heating operation) 11.5.8. Restart control (time delay safe...
Page 35
35 11.5.11. 4-way valve control • 4-way valve always on during heating operation. (except deicing operation) • when the unit is switched off by remote control during heating operation, the 4-way valve stay at heating position for 5 minutes. • this is to prevent the refrigerant flow process sound for...
Page 36
36 a) normal deicing time diagram (b) overload deicing time diagram.
Page 37
37 11.6. Indoor fan speed control • indoor fan speed can be set using remote control. 11.6.1. Fan speed rotation chart 11.6.2. Automatic fan speed control • when set to auto fan speed, the fan speed is adjusted between maximum and minimum setting as shown in the table. - fan speed rotates in the ran...
Page 38
38 • auto fan speed during cooling operation: 1. Indoor fan will rotate alternately between off and on as shown in below diagram. 2. At the beginning of each compressor start operation, indoor fan will increase fan speed gradually for deodorizing purpose. 3. For the first time the compressor operate...
Page 39
39 11.6.3. Manual fan speed control • manual fan speed adjustment can be carried out by using the fan speed selection button at the remote control. • there are 3 types of fan speed settings: lo, me, hi. 11.7. Outdoor fan speed control • there is 2 speed for outdoor fan motor. Outdoor fan speed can b...
Page 40
40 11.9. Horizontal airflow direction control 11.9.1. Auto control • when the horizontal airflow direction is set to auto using the remote control, the vanes swings left and right for cooling and soft dry (0°-44°), heating (8°-36°) as shown in the diagram. • when stopped with remote control, the dis...
Page 41
41 11.10. Powerful operation • the powerful operation is to achieve the setting temperature quickly. Cooling and soft dry operation condition) • when powerful operation is set, the setting temperature will be automatically decreased 3°c internally against the present setting temperature (lower tempe...
Page 42
42 11.11. Quiet operation • the quiet operation is to provide quiet cooling/heating operation condition compare to normal operation. (cooling and soft dry operation condition) • once the quiet mode is set at the remote control, quiet mode led illuminates. The sound level will reduce either around 2 ...
Page 43
43 (heating operation condition) • when the quiet mode is set at the remote control, quiet mode led illuminates. The sound level will reduce either around 2 db (lo) or 3 db (hi, me), against the present sound level operation. • quiet setting of fan speed rpm refer to indoor fan speed control. • manu...
Page 44
44 11.13. Random auto restart control • if there is a power failure during operation, the air conditioner will automatically restart after 3 to 4 minutes when the power is resumed. • it will start with previous operation mode and airflow direction. • if there are more than one air conditioner unit i...
Page 45: 12 Servicing Mode
45 12 servicing mode 12.1. Auto off/on button • the “auto off/on button” (behind the front grille) is used to operate the air conditioner if remote control is misplaced or mal- functioning. • forced cooling operation is possible by pressing the “auto off/on button” for more than 5s where “beep” soun...
Page 46
46 12.2.2. Clock • to change the remote control's clock-hour and minute. - press once to enter the clock setting mode. - use timer increment button timer decrement button to change the time. - press once again to exit the setting mode. • to change the time format (24 hours & 12 hours timer display)....
Page 47: 13 Troubleshooting Guide
47 13 troubleshooting guide 13.1. Refrigeration cycle system in order to diagnose malfunctions, make sure that there are no electrical problems before inspecting the refrigeration cycle. Such problems include insufficient insulation, problem with the power source, malfunction of a compressor and a f...
Page 48
48 13.1.1. Relationship between the condition of the air conditioner and pressure and electric current • carry out the measurements of pressure, electric current, and temperature fifteen minutes after an operation is started. 13.1.2. Diagnosis methods of a malfunction of a compressor and 4-way valve...
Page 49
49 14 disassembly and assembly instructions 14.1. Indoor electronic controllers, cross flow fan and indoor fan motor removal procedures 14.1.1. To remove the front grille • remove the 3 caps and 3 screws at the bottom of the front grille. (fig. 1) • remove the front grille by releasing the 3 hooks a...
Page 50
50 • release the cn-data1 connector. (fig. 5) • release the cn-sonic connector. (fig. 5) • release the cn-stm2 connector. (fig. 5) • release the cn-stm1 connector. (fig. 5) • release the cn-th connector. (fig. 5) fig. 5 14.1.3. To remove the power electronic controller • release the hook that hold t...
Page 51
51 14.1.5. To remove the control board • release the 3 screws. (fig. 9) • by pressing down the hook at the left, you will be able to remove the control board. (fig. 9) fig. 9 14.1.6. To remove the cross flow fan and indoor fan motor • remove the screw at the cross flow fan. (fig. 10) reminder:- to r...
Page 52: 15 Technical Data
52 15 technical data 15.1. Thermostat characteristics.
Page 53
53 15.2. Operation characteristics.
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Page 61
61 16 exploded view and replacement parts list 16.1. 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..
Page 62
62 (note) • all parts are supplied from phaam, malaysia (vendor code: 061). • “o” marked parts are recommended to be kept in stock. Ref. No. Part name & description qty. Cs-a18ekh cs-a24ekh remarks 1 chassy complete 1 cwd50c1394 ← 2 fan motor 1 cwa981149j ← 0 3 cross flow fan complete 1 cwh02c1010 ←...
Page 63
63 16.2. 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..
Page 64
64 (note) • all parts are supplied from phaam, malaysia (vendor code: 061). • “o” marked parts are recommended to be kept in stock. [phaam] printed in malaysia spyw0511-00 ref. No. Part name & description qty. Cu-a18ekh cu-a24ekh remarks 1 chassy ass’y 1 cwd50k2087 ← 2 compressor 1 2js324d3ab07 2js4...