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Mitsubishi Electric SLZ-KA09NA Technical & Service Manual
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Mitsubishi Electric SLZ-KA09NA Technical & Service Manual

Slz series ceiling cassettes
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See also: Operating Manual
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
Indoor unit
[Model names]
SLZ-KA09NA
SLZ-KA12NA
SLZ-KA15NA
Model name
indication
INDOOR UNIT
REMOTE CONTROLLER
[Service Ref.]
SLZ-KA09NA.TH
SLZ-KA12NA.TH
SLZ-KA15NA.TH
TEMP.
ON/OFF
(Option)
CONTENTS
2. SPECIFICATIONS ............................... 5
4. WIRING DIAGRAM .............................. 9
6. TROUBLESHOOTING ....................... 11
7. SPECIAL FUNCTION ........................ 23
8. 4-WAY AIR FLOW SYSTEM .............. 26
PARTS CATALOG (OCB487)
9700058
November 2010
No. OCH487
Note:
• This manual describes only
service data of the indoor
units.
• RoHS compliant products
have <G> mark on the spec
name plate.
• For servicing RoHS compli-
ant products, refer to the
RoHS Parts List.

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Summary of Contents for Mitsubishi Electric SLZ-KA09NA

  • Page 1: Table Of Contents

    November 2010 No. OCH487 TECHNICAL & SERVICE MANUAL Indoor unit Note: [Model names] [Service Ref.] • This manual describes only SLZ-KA09NA.TH service data of the indoor units. SLZ-KA09NA • RoHS compliant products have <G> mark on the spec SLZ-KA12NA.TH name plate.

  • Page 2: Part Names And Functions

    PART NAMES AND FUNCTIONS Indoor Unit SLZ-KA09NA.TH SLZ-KA12NA.TH SLZ-KA15NA.TH Filter Removes dust and pollutants from inhaled air. Horizontal Air Outlet Sets horizontal airflow automatically during cooling or dehumidifying. Grille Auto Air Swing Vane Disperses airflow up and down and adjusts the angle of airflow direction.
  • Page 3 Wired remote controller (Option) Once the controllers are set, the same operation mode can be repeated by simply pressing the ON/OFF button. SLZ-KA09NA.TH SLZ-KA12NA.TH SLZ-KA15NA.TH ON/OFF button Temperature setting buttons Down Fan Speed button Timer Menu button (Monitor/Set button) Filter button (<Enter>...
  • Page 4 Wired remote controller (Option) Display Section “Sensor” indication Day-of-Week For purposes of this explanation, Shows the current day of the week. Displays when the remote controller all parts of the display are shown. sensor is used. During actual operation, only the relevant items will be lit.

  • Page 5: Specifications

    SPECIFICATIONS Indoor model SLZ-KA09NA SLZ-KA12NA SLZ-KA15NA Power supply V, phase, Hz 208/230, 1, 60 Max. fuse size (time delay)/Disconnect switch A Min. circuit ampacity Fan motor F.L.A 0.23 0.28 0.28 Airfl ow 280-320-350 280-320-390 280-320-390 (Low - Med. - High)

  • Page 6: Spl(Db) Line

    NOISE CRITERION CURVES <60Hz> <60Hz> SLZ-KA12NA.TH SLZ-KA09NA.TH NOTCH SPL(dB) LINE NOTCH SPL(dB) LINE High High Medium Medium NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR HEARING FOR NC-20 NC-20 CONTINUOUS...

  • Page 7: Outlines And Dimensions

    OUTLINES AND DIMENSIONS SLZ-KA09NA.TH SLZ-KA12NA.TH SLZ-KA15NA.TH Unit : inch (mm) Detail drawing of fresh air intake Fresh air intake 1(25) 3-15/16( 100) 2-7/8( 73.4) 3- 1/8( 2.8) 20-7/8(530) Cut out hole Burring hole Suspension bolt pitch 22-7/16(570) Ceiling surface 7-27/32(199)
  • Page 8 Unit : inch (mm) WIRED REMOTE CONTROLLER (Option) 5-1/8 (130) 3/4 (19)

  • Page 9: Wiring Diagram

    WIRING DIAGRAM SLZ-KA09NA.TH SLZ-KA12NA.TH SLZ-KA15NA.TH GRILLE OUTDOOR UNIT CNSK (RED) 1 3 5 7 9 (D·HEATER) (D·U·M) (POWER (POWER) (FAN) BOARD) DC13.1V CNDK (CONTROL) FUSE CN3C CN2S (WHT) X6 X5 X4 (POWER BOARD) CN2D LED3 LED2 LED1 CN30 CN2L CN24...

  • Page 10: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM SLZ-KA09NA.TH SLZ-KA12NA.TH SLZ-KA15NA.TH Strainer Heat exchanger Refrigerant GAS pipe connection (Flare) Condenser/evaporator temperature thermistor (TH5) Refrigerant flow in cooling Refrigerant flow in heating Refrigerant LIQUID pipe connection (Flare) Pipe temperature thermistor/liquid Room temperature (TH2) thermistor (TH1) Strainer...

  • Page 11: Troubleshooting

    TROUBLESHOOTING 6-1. CAUTIONS ON TROUBLESHOOTING (1) Before troubleshooting, check the followings: 1Check the power supply voltage. 2Check that the indoor/outdoor connecting wire is correct. (2) Take care of the followings during servicing. 1 Before servicing the air conditioner, be sure to turn off the remote controller first to stop the main unit, and then turn off the breaker.
  • Page 12 • Refer to the following tables for details on the check codes. [Output pattern A] Beeper sounds Beep Beep Beep Beep Beep Beep Beep OPERATION · · · Repeated INDICATOR lamp blink pattern Approx. 2.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.
  • Page 13 • On IR wireless remote controller The continuous buzzer sounds from receiving section of indoor unit. Blink of operation lamp • On wired remote controller Check code displayed on the LCD. • If the unit cannot be operated properly after the test run, refer to the following table to find out the cause. Symptom Cause Wired remote controller...

  • Page 14: High

    Note: Refer to the manual of outdoor unit for the details of display 6-3. SELF-DIAGNOSIS ACTION TABLE such as F, U, and other E. Abnormal point and detection method Countermeasure Error Code Cause Room temperature thermistor (TH1) 1–3 Check resistance value of thermistor. 1 Defective thermistor 30°F ..
  • Page 15 Abnormal point and detection method Countermeasure Error Code Cause Freezing/overheating protection is oper- (Cooling or drying mode) (Cooling or drying mode) ating 1 Clogged filter (reduced airflow) 1 Check clogging of the filter. 1 Freezing protection (Cooling mode) 2 Short cycle of air path 2 Remove blockage.
  • Page 16 Abnormal point and detection method Countermeasure Error Code Cause Pipe temperature thermistor / Condenser 1 Defective thermistor 1–3 Check resistance value of thermistor. / Evaporator (TH5) characteristics For characteristics, refer to (P1) above. 1 The unit is in 3-minute resume protec- 2 Contact failure of connector 2 Check contact failure of connector (CN29) tion mode if short/open of thermistor is...
  • Page 17 Abnormal point and detection method Countermeasure Error Code Cause Indoor/outdoor unit communication 1 Contact failure, short circuit or, 1 Check disconnection or looseness of indoor/ error (Signal receiving error) outdoor unit connecting wire of indoor unit or miswiring (converse wiring) of 1 Abnormal if indoor controller board outdoor unit.
  • Page 18 6-4. TEST POINT DIAGRAM 6-4-1. Indoor power board SLZ-KA09NA.TH SLZ-KA12NA.TH SLZ-KA15NA.TH CN2S Connect to the indoor controller board (CN2D) between 1 to 3 12.6-13.7V DC (Pin1 (+)) CNSK Connect to the indoor controller board (CNDK) between 1 to 3 208/230V AC...
  • Page 19 6-4-2. Indoor controller board SLZ-KA09NA.TH SLZ-KA12NA.TH SLZ-KA15NA.TH LED2 CN2D LED1 LED3 Power supply Connector to the indoor power Power supply Transmission (R.B) board (CN2S) (12.5~13.7V DC) (I.B) (Indoor/outdoor) CN3C CN22 – Transmission Remote controller (Indoor/outdoor) connecting wire (0~24V DC) –...

  • Page 20: Trouble Criterion Of Main Parts

    6-5. TROUBLE CRITERION OF MAIN PARTS SLZ-KA09NA.TH SLZ-KA12NA.TH SLZ-KA15NA.TH Part name Check method and criterion Room temperature Measure the resistance with a tester. thermistor (Part temperature 50°F ~ 86°F) (TH1) Normal Abnormal Pipe temperature 4.3k~9.6k Opened or short-circuited thermistor/liquid (TH2)
  • Page 21 <Thermistor characteristic graph> < Thermistor for lower temperature > • Room temperature thermistor (TH1) Thermistor for • Pipe temperature thermistor/liquid (TH2) lower temperature • Condenser/evaporator temperature thermistor (TH5) Thermistor R =15k' ± 3% Fixed number of B=3480 ± 2% Rt=15exp { 3480( 273+(t-32)/1.8 30_F 15.8k'...
  • Page 22 : Open) Jumper wire Setting by the dip switch and jumper wire Remarks Functions MODELS Setting 1 2 3 4 5 SLZ-KA09NA.TH Capacity 1 2 3 4 5 settings SLZ-KA12NA.TH 1 2 3 4 5 SLZ-KA15NA.TH <Initial setting> IR wireless remote controller: 0...

  • Page 23: Special Function

    SPECIAL FUNCTION 7-1. Rotation Function (and back-up function, 2nd stage cut-in function) This function is only available when using wired remote controller. 7-1-1. Operation (1) Rotation function (and Back-up function) Outline of functions · Main and sub units operate alternately according to the interval of rotation setting. w Main and sub unit should be set by refrigerant address.
  • Page 24 System constraint · This function is available only in cooling mode. Ex.) Set temp. by R/C = 20:(68°F) [2nd stage cut-in function]··· Request code number "322~324" Set point = 26:(79°F) When request code number is “323”. Room temp. Set point Room temp.
  • Page 25 (2) Setting method of each function by wired remote controller B: Refrigerant address C: Data display area D: Request code display area 1. Stop operation( ). 2. Press the button ( ) for 3 seconds so that [Maintenance mode] appears on the screen ( ). TEST After a while, [00] appears in the refrigerant address number display area.(at 3.

  • Page 26: Way Air Flow System

    (Cut out hole) Ceiling surface Drain pipe Electrical Box Refrigerant pipe 8-2. FRESH AIR INTAKE AMOUNT & STATIC PRESSURE CHARACTERISTICS SLZ-KA09NA.TH SLZ-KA12NA.TH SLZ-KA15NA.TH Taking air into the unit How to read curves Q … Designed amount of fresh air intake...
  • Page 27 8-4. FIXING HORIZONTAL VANE Horizontal vane of each air outlet can be fixed according to the environment where it is installed. Setting procedure 1) Turn off a main power supply (Turn off a breaker). 2) Remove the vane motor connector in the direction of the arrow shown below with pressing the unlocking button as in the figure below.

  • Page 28: Disassembly Procedure

    DISASSEMBLY PROCEDURE SLZ-KA09NA.TH SLZ-KA12NA.TH SLZ-KA15NA.TH Be careful when removing heavy parts. OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 1. Removing the air intake grille Figure 1 (1) Slide the knob of air intake grille to the direction of the arrow 1 to open the air intake grille.
  • Page 29 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 4. Removing the electrical parts Photo 3 Indoor power board (P.B) (1) Remove the 2 screws and the control box cover. <Electrical parts in the control box> • Indoor controller board (I.B) • Terminal block (TB4) •...
  • Page 30 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 8. Removing the fan motor (MF) Photo 6 Screw Flat plate (1) Remove the panel. (Refer to step 3) (2) Remove the drain pan. (Refer to step 6) Screws Fan motor (3) Remove the nut and the washer from the turbo fan, and (MF) remove the turbo fan.
  • Page 31 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 10. Removing the heat exchanger Photo 9 (1) Remove the panel. (Refer to step 3) Screws of (2) Remove the drain pan. (Refer to step 6) piping cover (3) Remove the nut and the washer from the turbo fan, and remove the turbo fan.
  • Page 32 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN New publication, effective Nov. 2010 CCopyright 2010 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Specifications subject to change without notice. Distributed in Nov. 2010 No.OCH487 Made in Japan...

This manual is also suitable for:

Slz-ka15naSlz-ka12naMr. slim slz-ka09naMr. slim slz-ka12naMr. slim slz-ka15na

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