Panasonic CU-E18CKR Service Manual
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Panasonic CU-E18CKR Service Manual

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CS-E18CKR CU-E18CKR / CS-E21CKR CU-E21CKR
2003 Matsushita Industrial Corp. Sdn. Bhd. (11969-T). All rights
reserved. Unauthorized copying and distribution is a violation of
law.
1. Features
- Product
- Microcomputer-controlled compressor operating frequency
- Vertical and Horizontal Airflow Directions
- Five modes of operation selection
- Powerful Mode operation
- Delay ON Timer and OFF Timer
- Remote Control with illuminable buttons
Order No. MAC0306010C3
Room Air Conditioner

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Summary of Contents for Panasonic CU-E18CKR

  • Page 1 Order No. MAC0306010C3 Room Air Conditioner CS-E18CKR CU-E18CKR / CS-E21CKR CU-E21CKR 2003 Matsushita Industrial Corp. Sdn. Bhd. (11969-T). All rights reserved. Unauthorized copying and distribution is a violation of law. 1. Features - Product - Microcomputer-controlled compressor operating frequency - Vertical and Horizontal Airflow Directions...
  • Page 2 - Quality Improvement - Gas leakage detection - Deice operation - Auto restart control 2. Functions 3. Product Specifications Unit CS-E18CKR CU-E18CKR Cooling Capacity 5.30 (0.90 - 6.00) kcal/h 4,560 (770 - 5,160) BTU/h 18,100 (3,070 - 20,500) Heating Capacity 6.60 (0.90 - 8.00)
  • Page 3 Unit CS-E18CKR CU-E18CKR Airflow Method OUTLET SIDE VIEW TOP VIEW INTAKE Air Volume Indoor Air (Lo) Cooling; 12.5 (440) — /min (cfm) Heating; 13.9 (490) Indoor Air (Me) Cooling; 14.0 (490) — /min (cfm) Heating; 15.5 (540) Indoor Air (Hi) Cooling;...
  • Page 4 Unit CS-E18CKR CU-E18CKR Pipe Size inch G (gas side) ; 1/2” G (gas side) (Flare piping) inch L (liquid side) ; 1/4” L (liquid side) Drain Inner diameter — Hose Length 0.65 — Power Cord Length 2.1 m — Number of core-wire 3 core wires ×...
  • Page 5 improvement. Unit CS-E21CKR CU-E21CKR Cooling Capacity 6.30 (0.90 - 7.10) kcal/h 5,420 (770 - 6,110) BTU/h 21,500 (3,070 - 24,200) Heating Capacity 7.20 (0.90 - 8.50) kcal/h 6,190 (770 - 7,310) BTU/h 24,600 (3,070 - 29,000) Moisture Removal Pint/h (7.4) Power Source Phase Single...
  • Page 6 Unit CS-E21CKR CU-E21CKR dB (A) Cooling; High 45, Low Cooling Heating; High 45, Low Heating Noise Level Power level dB Cooling; High 58 Cooling; Heating; High 58 Heating; Electrical Data Input Power Cooling; 2,210 (240 - 2,540) Heating; 2,100 (280 - 2,750) Running Current Cooling;...
  • Page 7 Unit CS-E21CKR CU-E21CKR Air Circulation Type Cross-flow Fan Propeller Material ASHT-18 Motor Type Transistor (8-poles) Transistor Rate Output Fan Speed Lo (Cool/ 1,150 / 1,270 — Heat) Me (Cool/ 1,330 / 1,440 — Heat) Hi (Cool/ 1,520 / 1,610 700 / Heat) Heat Exchanger Description Evaporator...

  • Page 9: Refrigeration Cycle Diagram

    5. Refrigeration Cycle Diagram...

  • Page 10: Block Diagram

    6. Block Diagram...

  • Page 11: Wiring Diagram

    7. Wiring Diagram...

  • Page 12: Operation Details

    8. Operation Details 8.1. BASIC FUNCTION Inverter control, which equipped with a microcomputer in determining the most suitable operating mode as time passes, automatically adjusts output power for maximum comfort always. In order to achieve the suitable operatingmode, the microcomputer maintains the set temperature by measuring the temperature of the...
  • Page 13 environment and performing temperature shifting. The compressor at outdoor unit is operating following the frequency instructed by the microcomputer at indoorunit that judging the condition according to internal setting temperature and intake air temperature. 8.1.1. Internal Setting Temperature Once the operation starts, remote control setting temperature will be taken as base value for temperature shifting processes.
  • Page 15 Table (a): Auto Operation Mode Setting Mode Shift: Temperature Shift (°C) -2.0 Cooling/Soft Dry Heating +2.0 Heating Cooling/Soft Dry Table (b): Outdoor Air Temperature Shifting Mode: Outdoor Temperature, X (°C): Temperature Shift (°C) Manual Operation Auto Operation Cooling/Soft Dry 1.50 2.00 1.25 1.25...
  • Page 16 Mode: Period, X (min): Temperature Shift (°C) Cooling -2.0 Soft Dry -1.0 Heating +3.5 +3.25 Table (d): Quiet (Lo) Mode Shifting Mode: Period, X (min): Temperature Shift (°C) Cooling, Soft Dry -3.0 20 min 50 min -4.0 50 min 110 min -5.0 110 min 440 min...
  • Page 17 Freq. H Intake Air Temperature - Internal Setting Temperature (° Zone Cooling & Soft Dry Heating Cooling Soft Dry Heating -2.0 -1.5 -1.0 -0.5 -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 -3.5 -4.0 Operating Frequency Calculation Formula: CompHz = Freq. A × Freq. H + Freq. C Example Calculation: Model No.: E18CK Operation Mode: Cooling...
  • Page 18 Freq. Range E18CK E21CK Cooling Fc Operation 12 ~ 86 12 ~ 102 Range Heating Fh Operation 14 ~ 128 14 ~ 128 Range Remarks: When Freq. H is equal to 46 (Cooling), 39 (Heating) or above, the Comp. may run at the freq. higher than Fc or Fh up to max. freq. operation.
  • Page 19 8.1.5. Heating Operation 8.1.5.1. Thermostat control - Compressor is OFF when Intake Air Temperature - Internal Setting > +1.5°C. - Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature < Compressor OFF point -0.5°C.
  • Page 20 Remote Control Setting Temperature (°C) 16 ~ 18 19 ~ 22 23 ~ 26 27 ~ 30 There is a temperature shifting on T1, T2, and T3 if the operation mode judged is changed from Cooling/Soft Dry to Heating or vice verse. Operation Mode change from Temperature shifts (°C) Cooling/Soft Dry...

  • Page 21: Cooling / Dry

    Remote Control — — — Tab (rpm) SSHI SSLo E18CK 1590 1560 1480 1410 1340 1270 E21CK 1640 1610 1520 1440 1350 1270 B. Indoor Fan Control i. Indoor fan control operation outline 1. Cooling / Dry 2. Heating ii. Auto Fan Speed...
  • Page 22 1. Cooling 2. Heating Note: 1. UP: - If move from Lo, the fan speed will be shifted to Maximum 1520 rpm (E21CK), 1480 rpm (E18CK). - If move from Maximum, the fan speed no change. - In up zone, 10 rpm is added for every 10s until Maximum 1520 rpm (E21CK), 1480 rpm (E18CK).
  • Page 23 5. Temperature in ( ) is for Powerful Mode operation. iii. Max Capacity Condition a) During Cooling operation, if all to the following condition is fulfilled, the indoor fan speed is set to Shi. 1. Indoor intake temperature 24°C. 2. Operation frequency 72 Hz (E18CK), 95 Hz (E21CK) & above. 3.
  • Page 24 1. Condition * Step out signal input Feedback rotation speed is more than 2550 rpm or below 50 rpm. However, 10s after fan start, rotation abnormality is not detected. 2. Control * Fan stop 3. Return * Restart after 5s However, in case the fan is stopped by the above conditions within 25s after started, and happened continuously for 7 times, restart will not be performed.
  • Page 25 8.1.8. Outdoor Fan Motor Operation Outdoor fan motor is operated with 15 fan speed. It starts when compressor starts operation and it stops 30 seconds after compressor stops operation. Basic Rotation Speed 8.1.9. Airflow Direction 1. There are two types of airflow, vertical airflow (directed by horizontal vane) and horizontal airflow (directed by vertical vanes).
  • Page 26 Operation Mode Airflow Direction Vane Angle (°) Heating Auto with Heat Exchanger Temperature Manual Cooling, Soft Dry and Fan, 7 ~ 37 Auto Manual Mode Judgment in Auto Auto Manual 1. Automatic vertical airflow direction can be set using remote control;...
  • Page 27 Operation Mode Vane Angle (°) Heating, with heat exchanger 55 ~ 125 temperature Cooling, Soft Dry and Fan, Ion 55 ~ 125 2. Manual horizontal airflow direction can be set using remote control; the angles of the vane are as stated below and the positions of the vane are as Figure 2 above.
  • Page 28 A. Powerful button is pressed. B. Stop by OFF/ON switch. C. Timer “off” activates. D. When change mode to fan only mode. E. Quiet button is pressed again. 2. When quiet operation is stopped, operation is shifted to normal operation with previous setting. 3.
  • Page 29 8.1.10.2. Quiet operation (Heating) A. Purpose To provide quiet heating operation compare to normal operation. B. Control condition a. Quiet operation start condition - When “quiet” button at remote control is pressed. Quiet LED illuminates. b. Quiet operation stop condition 1.
  • Page 30 2. Fan speed for quiet operation is -100 rpm from setting fan speed. 3. Fan Speed Auto - If FM -100 rpm reduce from normal Heating Auto Fan Speed - If FM maintain RPM Indoor FM RPM depends on pipe temp sensor of indoor heat exchanger.
  • Page 31 shown below. 8.1.13. Delay OFF Timer Control Delay OFF timer can be set using remote control, the unit with timer set will stop operate at set time. 8.1.14. Auto Restart Control 1. When the power supply is cut off during the operation of air conditioner, the compressor will re-operate within three to four minutes (there are 10 patterns between 2 minutes 58 seconds and 3 minutes 52 seconds to be selected randomly) after powersupply...
  • Page 32 Lighting of 3 LED base on instructed running frequency from indoor unit to compressor at cool, dry & heating operation. Position of LED Cool, Dry Instructed Hz No Heat Instructed Hz No 8.1.16. Auto Operation Switch 1. When the switch is pressed between 0 to 5 seconds, Auto Mode operation starts to function.
  • Page 33 Control Condition a. Ionizer Only Operation. 1. When air-conditioner unit is at “OFF” condition (standby) and ION operation button at remote control is pressed. Fan & ionizer on, ION LED illuminates, but power LED maintain off. (1 However, fan speed can be adjusted later by customer during this operation.
  • Page 34 2. Ionising Operation Stop Condition When one of the following condition is satisfied, ION operation stops. A. Stopped by ON/OFF switch. B. Timer OFF activates. C. ION operation button is pressed again. D. ION feedback signal shows error. 3. Ionizer operation status is not memorised by micon. After OFF, when operation is “ON”...
  • Page 35 Control Detection Method Protection Recovery Case 1: During Air-Con. ON. Actual ion: OFF Air-Cond OFF with abnormal (i) When anytime (i) Actual ion OFF no. H26 is activated with CONDITION timer LED is blinking becomes false. ion feedback permanently. signal: 5V (ii) Case 2: During Air-Con.
  • Page 36 2. However, it can be stopped using remote control or Auto Switch at indoor unit. 8.2.1.3. Total Running Current Control 1. When the outdoor unit total running current (AC) exceeds X value, the frequency instructed for compressor operation will be decreased.
  • Page 37 B. DC Peak Current Control 1. When electric current to IPM exceeds set value of 25.0 ± 4.0 A, the compressor will stop operate. Then, operation will restart after three minutes. 2. If the set value is exceeded again more than 30 seconds after the compressor starts, the operation will restart after two minute.
  • Page 38 1. When the conditions listed in below table occur, the compressor stops and restarts after three minutes. 2. If this phenomenon is continuously occurring for twice within 20 minutes, all indoor and outdoor relays will be cut off. 3. This control is not applicable for deice operation. Conditions E18CK E21CK...
  • Page 39 the following operation. 1. During remote control setting is less than 28 deg Indoor Fan Speed Above Hi minHz = Above Me- minHz = Less than Me- minHz = Auto minHz = 2. During Powerful ON minHz = However, when less than thermo OFF for 120 sec. continuously, the above control will be cancel.
  • Page 40 8.2.2.2. Cooling Overload Control i. Pipe temperature limitation/restriction - Detects the Outdoor pipe temperature and carry out below restriction/limitation (Limit the compressor Operation frequency) - The compressor stop if outdoor pipe temperature exceeds 63°C - If the compressor stops 4 times in 20 minutes, Timer LED blinking (F95: outdoor high pressure rise protection)
  • Page 41 ii. Electrical part temperature rise protection control - To prevent electrical component temperature rise during cooling overload. - Judgement condition is by outdoor temperature (sampled every 10s). - Control contents: Outdoor fan speed (switch to zone A and B minimum fan speed). Outdoor total current (zone C) higher than the specified.
  • Page 42 8.2.2.3. Anti-Freezing Control 1. When indoor heat exchanger temperature is lower than 2°C continuously for six minutes, compressor will stop operating. 2. Compressor will resume its operation three minutes after the indoor heat exchanger is higher than 10°C. 3. At the same time, indoor fan speed increase +40 rpm compared to its normal operation.
  • Page 43 8.2.2.4. Anti-Dew Formation Control a) Control 1 - During anti-dew formation control, compressor operates at frequency shift as shown below when indoor fan speed is less than Me. - This control is cancelled after started for 420 minutes, or remote control setting temperature or fan speed setting is changed.
  • Page 44 1. Manual Fan Speed 2. Auto Fan Speed Note: A. UP: - If move from Lo, the fan speed will be shifted to Maximum 1520 rpm (E21CK), 1480 rpm (E18CK). - If move from Maximum, the fan speed no change.
  • Page 45 - In up zone, 10 rpm is added for every 10s until Maximum 1520 rpm (E21CK), 1480 rpm (E18CK). B. DOWN: - The fan speed will be decreased one step every 10 sec. until Minimum 1270 rpm. C. Current Output Fixed: - Maintain at present fan speed.
  • Page 46 The compressor operating frequency is regulated in accordance to indoor heat exchanger temperature as shown in below figures. 8.2.3.5. Outdoor Temperature Control - Outdoor temperature is detected and the following control is perform. - Control operates after more than 1 minute the compressor has started.
  • Page 47 8.2.3.6. Deice Control A. Deice operation (Normal Deice Operation) 1. Detection methods Outdoor heat exchanger temperature sensor, timer. 2. Deice operation time chart Notes 1. During deice operation, the relationship between outdoor pipe temperature and time T1 is such operation will proceed to next...

  • Page 48: Explanation Of Operation

    stage. 2. The deice will be performed only after 1 hour from when the operation has started. 3. When Comp. OFF by the sequence No. 1, 6, 7 compressor can restart back without 3 minutes waits (immediate restart). Outdoor heat exchanger temperature 15°C 18°C 25°C...
  • Page 49 B. Continuously, outdoor heat exchanger temperature < 3°C for 80 minutes and outdoor heat exchanger temperature < -6°C for 3 minutes and outdoor air temperature > -1°C and Comp. is ON. C. Continuously, outdoor heat exchanger temperature < 3°C for 40 minutes and outdoor heat exchanger temperature <...
  • Page 50 4. Auto clean deice time chart Similar to deice operation 2 except for frequency values. A. Detection methods Outdoor heat exchanger temp. sensor, timer, indoor air temp. sensor. B. Deice operation control time chart. Notes 1. During deice operation, the relationship between outdoor pipe temperature and time T1 is such proceed to next operation.
  • Page 51 15°C 18°C 25°C 9. Operating Instructions 10. Installation And Servicing Air Conditioner Using R410A 10.1. OUTLINE 10.1.1. About R410A Refrigerant 1. Converting air conditioners to R410A / Since it was declared in1974 that chlorofluorocarbons (CFC), hydro chlorofluorocarbons (HCFC) and other substances pose a destructive danger to the ozone layer in the earth~s upper stratosphere (20to 40 km above the earth), measures have been taken around the world to prevent this destruction.
  • Page 52 stable, non-flammable refrigerants with low toxicity. / However, just like R22, the specific gravity of R410A gasis heavier than that of air. Because of this, it can cause an oxygen deficiency if it leaks into a closed room since it collects in the lower area of the room.
  • Page 53 Refrigerant Temperature (°C) R410A 0.30 0.14 0.70 0.40 1.35 0.81 2.32 1.43 3.73 2.33 4.15 2.60 D. R410A refrigerating machine oil / Conventionally, mineral oil or a synthetic oil such as alkylbenzene has been used for R22 refrigerating machine oil. Because of the poor compatibility between R410A and conventional oils like mineral oil, however,there is a tendency for the refrigerating machine oil to collect in the refrigerating cycle.

  • Page 54: Tool For Installing / Servicing Refrigerant Piping

    5. When installing or transferring an AC, follow the instructions in the installation instructions carefully. Incorrect installation can result in an abnormal refrigeration cycle or water leakage, electric shock, fire, etc. 6. Do not perform any alterations on the AC unit under any circumstances.

  • Page 55: Torque Wrenches

    Type of work Ordinary tools R410A tools Refrigerant charging Electronic scale for refrigerant charging Refrigerant cylinderCharging orifice and packing for refrigerant cylinder Brazing(Replacing refrigerating Nitrogen blow set (be sure to cycle part*1) use nitrogen blowing for all brazing), and brazing), and brazing machine *1) Always replace the dryer of the outdoor unit at the same time.
  • Page 56 Fig. 3 Torque wrenches Table 5 Conventional wrenches R410A wrenches For 1/4 (opposite side x torque) 17 mm x 18 N.m (180 kgf.cm) 17 mm x 18 N.m (180 kgf.cm) For 3/3 (opposite side x torque) 22 mm x 42 N.m (180 kgf.cm) 22 mm x 42 N.m (180 kgf.cm) For 1/2 (opposite side x torque) 24 mm x 55 N.m (180 kgf.cm)
  • Page 57 5. Charging hose - The pressure resistance of the charging hose has been raised to match the higher pressure of R410A. The hose material has also been changed to suit HFC use, and the size of the fitting has been changed to match the manifold ports. Fig.
  • Page 58 - For detecting small amounts of gas leakage, use the electric gas leak detector for HFC refrigerant. (Detection sensitivity with R410A is about 23 g/year). Fig. 5 Vacuum pump adaptor Fig. 6 Electric gas leak detector for HFC refrigerant 8. Electronic scale for refrigerant charging - Because of the high pressure and fast vaporizing speed of R410A, the refrigerant cannot be held in a liquid phase inside the charging cylinder when charging is done using the...
  • Page 59 the valve. 9. Refrigerant cylinders - The R410A cylinders are labeled with the refrigerant name, and the coating color of the cylinder protector is pink, which is the color stipulated by ARI of the U.S. - Cylinder equipped with a siphon tube are available to allow the cylinder to stand upright for liquid refrigerant charging.

  • Page 60: Refrigerant Piping Work

    R410A tools Usable for R22 models Copper tube gauge for clearance adjustment Flaring tool (clutch type) Manifold gauge Charging hose Vacuum pump adaptor Electric gas leak detector for HFC refrigerant Electronic scale for refrigerant charging Refrigerant cylinder Charging orifice and packing for refrigerant cylinder 10.3.
  • Page 61 D. Flaring / Check the clamp bar and the cleanliness of the copper pipe. / Be sure to sued the clamp bar to do the flaring with accuracy. Use either an R410A flaring tool, or a conventional flaring tool. flaring tools come in different sizes,so be sure to check the size before using.
  • Page 62 Nominal Outside Wall A (mm) thickness diameter diameter R410A flaring Conventional flaring tool (mm) (mm) tool, clutch Clutch type Wing-nut type type 6.35 0 - 0.5 0.5 - 1.0 1.0 - 1.5 9.52 0 - 0.5 0.5 - 1.0 1.0 - 1.5 12.70 0 - 0.5 0.5 - 1.0...
  • Page 63 10.3.3. Storing and managing Piping Materials 1. Types of piping and their storage / The following is a general classification of the refrigerant pipe materials used for ACs. Because the gas pressure of R410A is approximately 1.6 times as high as that of R22, copper pipes with the thickness shown in Table 10, and with minimal impurities must be used.

  • Page 64: Installation, Transferring, Servicing

    C. Complete all pipe connections in as short a time as possible. If the pipe must be left standing for a long time after removing the seal, it must be thoroughly purged with nitrogen, or dried with a vacuum pump. 10.4.
  • Page 65 Precautions - Be sure to read the instructions for the vacuum pump, vacuum pump adaptor and manifold gauge prior to use, and follow the instructions carefully. - Make sure that the vacuum pump is filled with oil up to the designated line on the oil gauge.
  • Page 66 - Press the TEST RUN button on the indoor unit, and allow preliminary for 5-6 minutes. (TEST RUN mode) - After stopping the operation, let the unit sit for about 3 minutes, then close the 2-way valve by turning the valve stem in the clockwise direction.
  • Page 67 be thoroughly cleaned, but this is difficult with the present technology. 10.4.4. Refrigerant Compatibility (Using R410A Refrigerant in R22 ACs and Vice Versa) Do not operate an existing R22 AC with the new R410A refrigerant. Doing so would result in improper functioning of the equipment or malfunction, and might lead to a major accident such as an explosion in the refrigeration cycle.
  • Page 68 manifold gauge and purge the air. (2)(4) (Watch the liquid refrigerant closely at this point.) 8. After adjusting the electronic scale to zero, open the charging valve, then open the valve Lo of the manifold gauge and charge with the liquid refrigerant. (2)(5) (Be sure to read the operating instructions for the electronic scale.) 9.
  • Page 69 10.4.6. Brazing As brazing requires sophisticated techniques and experiences, it must be performed by a qualified person. / In order to prevent the oxide film from occurring in the pipe interior during brazing, it is effective to proceed with brazing while letting drynitrogen gas (N2) flow. <Brazing Method for Preventing Oxidation>...
  • Page 70 Cautions during brazing 1. General Cautions A. The brazing strength should be high as required. B. After operation, airtightness should be kept under pressurized condition. C. During brazing do not allow component materials to become damaged due to overheating. D. The refrigerant pipe work should not become blocked with scale or flux.

  • Page 71: Installation Instructions

    antioxidant are available on the market. However, the constituents of these are widely varied, and some are anticipated to corrode the piping materials, or adversely affect HFC refrigerant,lubricating oil, etc. Exercise care when using an oxidation preventive. 10.4.7. Servicing Tips The drier must also be replaced whenever replacing the refrigerant cycle parts.
  • Page 72 This indication shows the possibility of causing injury or damage to properties only. The items to be followed are classified by the symbols: Symbol with background white denotes item that is PROHIBITED from doing. - Carry out test running to confirm that no abnormality occurs after the installation.
  • Page 73 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. 1. The equipment must be earthed. It may cause electrical shock if grounding is not perfect. 2.
  • Page 74 Applicable piping kit CZ-4F5, 7, 10AN (E18CK, E21CK) SELECT THE BEST LOCATION 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.
  • Page 75 - Do not place any obstacles which may cause a short circuit of the discharged air. - If piping length is over 10m, additional refrigerant should be added as shown in the table. Indoor/Outdoor Unit Installation Diagram - This illustration is for explanation purposes only. / The indoor unit...

  • Page 76: Indoor Unit

    will actually face a different way. 11.2. INDOOR UNIT 11.2.1. SELECT THE BEST LOCATION / (Refer to “ Select the best location ” section) 11.2.2. 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.

  • Page 77: Indoor Unit Installation

    - Drill the piping hole at either the right or the left and the hole should be slightly slanted to the outdoor side. 11.2.3. TO DRILL A HOLE IN THE WALL AND INSTALL A SLEEVE OF PIPING 1. Insert the piping sleeve to the hole. 2.
  • Page 78 3. For the embedded piping...
  • Page 79 (This can be used for left rear piping & left bottom piping also.)

  • Page 80: Connect The Cable To The Indoor Unit

    11.2.5. 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 4 × 2.5 mm (E18CK, E21CK) flexible cord, type designation 245 IEC 57 or heavier cord.
  • Page 81 A. Open the front panel. B. Remove the air filters. C. Put air purifying filters (left) and triple deodorizing filter (right) into place as shown in illustration below. HOW TO TAKE OUT FRONT GRILLE Please follow the steps below to take out front grille if necessary such as when servicing.

  • Page 82: Auto Operation Mode

    A. Open the intake grille and remove the screw at the front of the front grille. B. Set the vertical airflow direction louver to the horizontal position. C. Slide down the 3 caps on the front grille as shown in the illustration below, and then remove the 3 mounting screws.

  • Page 83: Install The Outdoor Unit

    at eighth sec. (However, a “beep” sound is occurred at fifth sec.) 4. REMOTE CONTROL RECEIVING SOUND ON/OFF The ON/OFF of Remote Control receiving sound can be changed over by following steps: A. Press “AUTO” switch continuously for more than 16 sec. to below 21 sec.

  • Page 84: Connecting The Piping

    2. When installing at roof, please consider strong wind and earthquake. Please fasten the installation stand firmly with bolt or nails. 11.3.3. CONNECTING THE PIPING Connecting The Piping To Indoor Unit Please make flare after inserting flare nut (locate at joint portion of tube assembly) onto the copper pipe.

  • Page 85: Evacuation Of The Equipment (For Europe & Oceania Destination)

    Turn the piping end down to avoid the metal powder entering the pipe. 3. Please make flare after inserting the flare nut onto the copper pipes. 11.3.4. EVACUATION OF THE EQUIPMENT (FOR EUROPE & OCEANIA DESTINATION) WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES in the following procedure.

  • Page 86: Connect The Cable To The Outdoor Unit

    4. Close the Low side valve of the charging set and turn off the vacuum pump. Make sure that the needle in the gauge does not move after approximately five minutes. Note: BE SURE TO FOLLOW THIS PROCEDURE IN ORDER TO AVOID REFRIGERANT GAS LEAKAGE.

  • Page 87: Pipe Insulation

    the screw. 11.3.6. PIPE INSULATION 1. Please carry out insulation at pipe connection portion as mentioned in Indoor/Outdoor Unit Installation Diagram. Please wrap the insulated piping end to prevent water from going inside the piping. 2. If drain hose or connecting piping is in the room (where dew may form), please increase the insulation by using POLY-E FOAM with thickness 6 mm or above.
  • Page 88 EVALUATION OF THE PERFORMANCE - Operate the unit at cooling operation mode for fifteen minutes or more. - Measure the temperature of the intake and discharge air. - Ensure the difference between the intake temperature and the discharge is more than 8°C. CHECK ITEMS Is there any gas leakage at flare nut connections?

  • Page 89: Servicing Information

    Is there any abnormal sound? Is the cooling operation normal? Is the thermostat operation normal? Is the remote control’s LCD operation normal? Is the air purifying filter installed? 12. Servicing Information Caution: - Pb free solder has a higher melting point than standard solder; Typically the melting point is 50 (30 - 40°C) higher.
  • Page 90 (b) Heating Press the Auto button continuously for 8 seconds or less than 11 seconds, the air conditioner starts operation at Heating rated frequency. (“beep” “beep” will be heard at the 8th second.) Troubleshooting Air Conditioner Refrigeration cycle system In order to diagnose malfunctions, make sure that there are no electrical problems before inspecting the refrigeration cycle.
  • Page 91 1. Relationship between the condition of the air conditioner and pressure and electric current...
  • Page 92 Cooling Mode Heating Mode Condition of the conditoner Low Pressure High Electric Low Pressure High Electric Pressure current Pressure current during during operation operation Insufficient refrigerant (gas leakage) Clogged capillary tube or Strainer Short circuit in the indoor unit Heat radiation deficiency of the outdoor unit Inefficient...
  • Page 93 memory (abnormality detected), four “beep” sounds will be heard and Power LED will light on. Otherwise, one “beep” sound is heard. If “CHECK” button is press again during Cooling operation using test run operation mode for 30 seconds, the diagnosis mode will turn off. Error Codes Table Abnormality / Protection control Abnormality...
  • Page 94 Cooling / Heating cycle 4 times — 4-way valve changeover abnormality occurance V-coil within 30 minutes PFC control 4 times — Voltage at PFC occurance within 10 minutes Refrigeration cycle 7 times — No refrigerant (3-way valve is closed) abnormality occurance continuously Outdoor compressor...
  • Page 95 the reset point once to clear the memory data. - Changing the wireless remote control transmission code When there are more than one indoor units installed in the same room, it is possible to set different remote control receiving signal by modifying the jumpers inside Remote Control.
  • Page 96 the Front Grille. (Fig. - Remove the 3 caps and 3 screws at the bottom of the Front Grille. (Fig. - Remove the Front Grille by releasing the 3 hooks at the top of the Front Grille. (Fig. - Unhook the tabs at the Control Board to remove the Control Board Cover.
  • Page 97 Fig. 4 12.5. Cross Flow Fan and Indoor Fan Motor Removal Procedures 1. In order to remove the Cross Flow Fan and Indoor Fan Motor, Control Board need to be taken out by releasing all the connectors as indicated below. A.
  • Page 98 Fig. 6 Fig. 7 Fig. 8 6. Remove the Bearing. (Fig. 7. Remove the screws at the left of the Evaporator. (Fig. 8. Push up the Evaporator and pull out the Cross Flow Fan from shaft. By then, Fan Motor can be taken out. (Fig.
  • Page 99 REMINDER - To reinstall the Fan Motor, put it back in place, adjust the position of the Fan Motor’s leadwire appropriately as shown in the Fig. 8 before installing the Cross Flow Fan. Fig. 9 Fig. 10 12.6. Outdoor Electronic Controller Removal Procedure 1.

  • Page 100: Technical Data

    2. Remove the Outdoor Electronic Controller Fig. 18 Caution! When handling electronic controller, be careful of electrostatic discharge. Fig. 19 13. Technical Data...

  • Page 103: Exploded View

    Outdoor Temp. (°C) Indoor wet bulb temp. 17.0°C 5.26 3.99 1.51 4.91 3.82 1.63 4.57 3.67 1.74 4.16 3.49 1.88 19.0°C 5.30 1.65 19.5°C 5.77 4.17 1.54 5.40 4.01 1.66 5.02 3.86 1.77 4.56 3.67 1.91 22.0°C 6.29 4.33 1.57 5.88 4.16 1.69...

  • Page 104: Replacement Parts List

    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. 15. Replacement Parts List <Model: CS-E18CKR & CS-E21CKR>...
  • Page 105 REF. NO. PART NAME & DESCRIPTION QTY. CS-E18CKR CS-E21CKR CHASSY COMPLETE CWD50C1293 FAN MOTOR CWA981056 CROSS FLOW FAN COMPLETE CWH02C1010 SCREW - CROSS FLOW FAN CWH4580304 BEARING ASS’Y CWH64K007 EVAPORATOR CWB30C1387 CWB30C1336 FLARE NUT CWT25086 (1/4”) FLARE NUT CWT25096 (1/2”) INTAKE AIR SENSOR HOLDER CWH32142 DISCHARGE GRILLE COMPLETE...
  • Page 106 REF. NO. PART NAME & DESCRIPTION QTY. CS-E18CKR CS-E21CKR SCREW - FRONT GRILLE XTT4+16C CAP - FRONT GRILLE CWH521062 DRAIN HOSE CWH85285 AIR PURIFYING FILTER CWMD00C0001 TRIPLE DEODORIZING FILTER CWMD00C0004 BAG COMPLETE - INSTALLATION SCREW CWH82C067 INSTALLATION PLATE CWH36K1007 FULCRUM CWH621013 ELECTRONIC CONTROLLER - IONIZER CWA743099...
  • Page 107 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. 17. Replacement Parts List <Model: CU-E18CKR & CU-E21CKR>...
  • Page 108 DESCRIPTION & NAME QTY. CU-E18CKR CU-E21CKR REMARKS CHASSY ASSY CWD50K2085 ANTI-VIBRATION BUSHING CWH50077 COMPRESSOR 5CS130XAC03 NUT-COMPRESSOR MOUNT CWH56000 SOUND PROOF MATERIAL CWG302111 FAN MOTOR BRACKET CWD541054 FAN MOTOR CWA981110 SCREW - FAN MOTOR BRACKET CWH551060 SCREW - FAN MOTOR MOUNT...

  • Page 109: Electronic Circuit Diagram

    DESCRIPTION & NAME QTY. CU-E18CKR CU-E21CKR REMARKS CABINET SIDE PLATE (RIGHT) CWE041083A HANDLE CABINET FRONT PLATE CO. CWE06K1043 WIRE NET CWD041041A CABINET TOP PLATE CWE031031A CONTROL BOARD COVER CWH131168 CONTROL BOARD COVER CWH131169A OPERATING INSTRUCTION CWF563992 INSTALLATION INSTRUCTION CWF612433 L-TUBE...
  • Page 110 How to use electronic circuit diagram...
  • Page 111 TIMER TABLE <INDOOR> Test mode Name Time (When test point Short-circuited) 4 way valve abnormality 4 min. 24 sec. Outdoor air temp. for Hz No. decision 30 min. 0 sec. Anti-dew formation control 20 min. 0 sec. Anti-freezing control 6 min. 0 sec.

  • Page 112: Remote Control

    Test mode Name Time (When test point Short-circuited) DC PEAK 30 sec. 3 sec. 120 min. 24 sec. Deice detection 80 min. 16 sec. 40 min. 8 sec. 40 min. 8 sec. Hz lock time 30 sec. 0 sec. Outdoor fan delay operation control 30 sec.

  • Page 113: Print Pattern / Indoor Unit Printed Circuit Board

    18.2. PRINT PATTERN / INDOOR UNIT PRINTED CIRCUIT BOARD...

  • Page 114: Print Pattern / Outdoor Unit Printed Circuit Board View

    18.3. PRINT PATTERN / OUTDOOR UNIT PRINTED CIRCUIT BOARD VIEW...
  • Page 115 [MAICO] Printed in Malaysia /...
  • Page 116 • CS-E18CKR CS-E21CKR SCHEMATIC DIAGRAM 1/3 TO OUTDOOR ELECTRONIC CONTROL UNIT CN-MAIN PH10 (WHT) TEMPERATURE FUSE (YLW/GRN) (YLW/GRN) 100µ 330Ω (BLK) 47µ 1000p (MB) (RED) R1 43Ω R2 43Ω (BRW) 1/2W 1/2W RY-PWR (BLK) CN-HA R17 1kΩ DISPLAY TD62003AF 2KHz 0.01µ...
  • Page 117 SCHEMATIC DIAGRAM 2/3 RECEIVER R101 IC101 R14 510Ω CN-RCV 1kΩ C101 (MX-3) CN-RCV 22µF 10V (NHG) R12 1kΩ 1000p 20kΩ 20kΩ 20kΩ (MB) 20kΩ 1kΩ R8 5.1kΩ 100Ω 100Ω (2125) (2125) 0.1µ 0.022µ [KB] CN-STM1 (PH5) TD62003AF (ZH5) VERTICAL CN-STM2 (PH5) (ZH5) HORIZONTAL...
  • Page 118 SCHEMATIC DIAGRAM 3/3 ELECTRONIC CONTROL UNIT (CONVERTER UNIT) F001 CN001 C003 L001 Z001 C002 C005 DB004 C004 Z002 R056 TH002 TH001 D007 R030 R046 CN002 L002 R003 R028 PC005 Q002 R029 R113 PC001 R114 PC004 R002 Q001 R004 R116 ZD005 PC002 PC006 4.7k...
  • Page 119 • CU-E18CKR CU-E21CKR SCHEMATIC DIAGRAM 1/5 REACTOR GRY2 GRY1 DC-2 DC-1 LJP111 LJP105 BROWN R151 BLUE JUMPER R177 C103 R150 C104 100k 400V C102 400V R170 C101 R149 PTC2 100k LJP107 350V ZNR107 R148 LJP110 R171 C105 C106 YELLOW 100k...
  • Page 120 SCHEMATIC DIAGRAM 2/5 TANK TEMP. SENSOR (50k 3950) CN-TANK LJP112 BROWN FUSE 3.15A 250V LJP109 LJP113 BLACK BLACK 499k 499k 1/4W 1 1/4W 1 499k 499k 1/4W 1 1/4W 1 R139 R134 8.25k 7.68k R205 CN203 R203 R206 Q201 6.3V 2SC2412K R204 100k...
  • Page 121 SCHEMATIC DIAGRAM 3/5 2 x fHz RY-2 RY-1 6 13 12 CN201 3 R218 CN202 R212 R213 R214 R215 R216 R217 R249 CN201 16 CN202 5 CN202 9 R211 10k CN202 6 CN202 7 R210 10k C227 R252 0.56 6.3V R253 1k CN203 C220...
  • Page 122 SCHEMATIC DIAGRAM 4/5 4 WAYS VALVE CN-FW1 CN-HOT (XH7-5) (VH3-2) 10k x 6 0.047 6.3V TC74HCT700AF ERA15-06 0.047 (FC) 1000p x 6 0.22 630V R199 0.047 R102 PTC3 ZPC56CH251A1UC RY-2 ALD112A01 ERA15-06 RY-1 ALA2ZF12E01 RD24EB2 DTA143XK 4.7k 5.11k 5.11k RY-PWR DTC143XK ERA15-01 2SC2411KRTX...
  • Page 123 SCHEMATIC DIAGRAM 5/5 T101 ETXMJ326X1C NJM78M15F ERA2204-04 0.01 0.01 (FC) D8 ERB83-006 0.22 630V (MF) NJM78M05F 0.01 ERA22-04 4.7k 1/4W (FC) AUO1A x 3 0.47 630V HV1C1 0.047 (MDS) (FC) (FC) HV1C2 0.047 (FC) BLUE COMPRESSOR HV1C3 0.047 (FC) YELLOW LVIC U OUT 1000p x 3...
  • Page 124 Remote Control Illuminable buttons OFF/ON FAN SPEED Operation OFF / ON Indoor Fan Speed Selection • • Medium- MODE • Medium Operation Mode Selection • Medium+ • High • Automatic Operation • Automatic Fan Speed AUTO • Heating Operation HEAT •...
  • Page 125 Indoor Unit Automatic Operation Switch Five Operation Modes • Press for < 5s to run Automatic Operation. • Automatic, Heating, Cooling, Soft Dry (Used when the remote control cannot be used.) and Fan Operation. • Press continuously for 5s and < 8s to run Forced Cooling Operation.
  • Page 126 Outdoor Unit Breakdown Self Diagnosis Time Delay Safety Control Function 30 seconds Forced Operation Low Pressure Control (Gas Leakeage Detection) Overload Protection Control Indoor Power Relay Control Total Running Current Control Compressor Overheating Anti-Dew Formation Control Prevention Control Anti Freezing Control IPM (Power Transistor) Overheating Protection Control Anti-Cold Draft Control...
  • Page 127 Ionizer DO NOT TOUCH...
  • Page 129 Select Set time Confirm Set time Confirm ON & OFF Set time Confirm Timer Timer Timer Current time OK? –> Setting: page 48...
  • Page 130 Soaps Neutral household detergents ( pH7) every 6 months see page 44 see page 48...
  • Page 131 refer page 47...
  • Page 133 NEVER install, remove or reinstall yourself Do NOT pull out the plug by the cable Do NOT insert finger or other objects into the unit! —> especially dangerous for children!
  • Page 134 47 / 48 47 / 48...

This manual is also suitable for:

Cu-e21ckrCs-e18ckrCs-e21ckr

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