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Mitsubishi Electric SLZ Series Technical & Service Manual
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Mitsubishi Electric SLZ Series Technical & Service Manual

Split-type, heat pump air conditioners
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
Indoor unit
[Model Name]
SLZ-KA25VAL3
SLZ-KA35VAL3
SLZ-KA50VAL3
Model name
indication
INDOOR UNIT
ON/OFF
TOO
TOO
WARM
COOL
FAN
SELECT
AUTO COOL
VANE
TIME
HEAT
DRY
MODE
RESET
REMOTE CONTROLLER
[Service Ref.]
SLZ-KA25VAL3.TH
SLZ-KA25VAL3.TH-ER
SLZ-KA35VAL3.TH
SLZ-KA35VAL3.TH-ER
SLZ-KA50VAL3.TH
SLZ-KA50VAL3.TH-ER
WIRED REMOTE CONTROLLER
(Option)
Note:
• This manual describes only
service data of the indoor units.
CONTENTS
1. REFERENCE MANUAL ...................... 2
3. SPECIFICATIONS ............................... 6
5. WIRING DIAGRAM ............................ 11
7. TROUBLESHOOTING ....................... 13
8. 4-WAY AIR FLOW SYSTEM .............. 27
PARTS CATALOG (OCB564)
June 2014
No. OCH564

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  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS June 2014 No. OCH564 TECHNICAL & SERVICE MANUAL Indoor unit Note: [Model Name] [Service Ref.] • This manual describes only SLZ-KA25VAL3.TH service data of the indoor units. SLZ-KA25VAL3 SLZ-KA25VAL3.TH-ER SLZ-KA35VAL3.TH SLZ-KA35VAL3 SLZ-KA35VAL3.TH-ER SLZ-KA50VAL3.TH SLZ-KA50VAL3 SLZ-KA50VAL3.TH-ER CONTENTS 1.

  • Page 2: Reference Manual

    Use the specified refrigerant only Never use any refrigerant other than that specified. Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.
  • Page 3 2-2. WIRELESS REMOTE CONTROLLER TEMPERATURE SETTING button To set any desired room temperature. ON/OFF WARM COOL ON / OFF button To start and to stop operation. SELECT AUTO COOL TIMER SELECT button To set time to start or stop VANE TIME HEAT unit operation.
  • Page 4 2-3. Wired remote controller (Option) PAR-31MAA The functions which can be used are restricted according to each model. The main display can be displayed in two different modes: "Full" and "Basic." Display The initial setting is "Full." 1 Operation mode Indoor unit operation mode appears here.
  • Page 5 Main menu list Setting and display items Setting details Vane · Louver · Vent. Use to set the vane angle. • Select a desired vane setting from five different settings. (Lossnay) Use to turn ON / OFF the louver. • Select a desired setting from "ON" and "OFF." Use to set the amount of ventilation.

  • Page 6: Specifications

    SPECIFICATIONS Indoor service ref. SLZ-KA25VAL3.TH(-ER) SLZ-KA35VAL3.TH(-ER) SLZ-KA50VAL3.TH(-ER) Cooling Heating Cooling Mode Cooling Heating Heating Single phase Single phase Single phase Power supply (phase, cycle, voltage) 50 Hz, 230 V 50 Hz, 230 V 50 Hz, 230 V Input 0.05 0.03 0.05 0.03 0.05...
  • Page 7 NOISE CRITERION CURVES <50Hz> <50Hz> SLZ-KA50VAL3.TH(-ER) SLZ-KA25VAL3.TH(-ER) NOTCH SPL(dB) LINE NOTCH SPL(dB) LINE High High SLZ-KA35VAL3.TH(-ER) 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 CONTINUOUS NOISE...

  • Page 8: Outlines And Dimensions

    OUTLINES AND DIMENSIONS SLZ-KA25VAL3.TH Unit: mm SLZ-KA35VAL3.TH SLZ-KA50VAL3.TH SLZ-KA25VAL3.TH-ER SLZ-KA35VAL3.TH-ER SLZ-KA50VAL3.TH-ER OCH564...
  • Page 9 Unit: mm WIRELESS REMOTE CONTROLLER 17.5 ON/OFF WARM COOL SELECT AUTO COOL VANE TIME HEAT MODE RESET Installation area • Area in which the remote controller is not exposed to direct sunlight • Area in which there is no heating source nearby •...
  • Page 10 WIRED REMOTE CONTROLLER PAR-31MAA (Option) Unit: mm OCH564...

  • Page 11: Wiring Diagram

    WIRING DIAGRAM SLZ-KA25VAL3.TH SLZ-KA35VAL3.TH SLZ-KA50VAL3.TH SLZ-KA25VAL3.TH-ER SLZ-KA35VAL3.TH-ER SLZ-KA50VAL3.TH-ER See fig.*1 LED2 1 2 3 4 5 1 2 3 4 5 OUTDOOR OFF ON (FAN) (CONTROL) UNIT CNMF CN3C 6 5 4 CN51 CN32 REMOTE CONTROLLER (D·U·M) CN2L LED3 (LIQUID) (D-HEATER) TH22 CN21...

  • Page 12: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM SLZ-KA25VAL3.TH SLZ-KA35VAL3.TH SLZ-KA50VAL3.TH SLZ-KA25VAL3.TH-ER SLZ-KA35VAL3.TH-ER SLZ-KA50VAL3.TH-ER Strainer Heat exchanger Refrigerant GAS pipe connection (Flare) Condenser/evaporator temperature thermistor (TH23) Refrigerant flow in cooling Refrigerant flow in heating Refrigerant LIQUID pipe connection (Flare) Pipe temperature thermistor/liquid Room temperature (TH22) thermistor (TH21) Strainer Distributor...

  • Page 13: Troubleshooting

    TROUBLESHOOTING 7-1. CAUTIONS ON TROUBLESHOOTING (1) Before troubleshooting, check the followings: Check the power supply voltage. Check that the indoor/outdoor connecting wire is correct. (2) Take care of the followings during servicing. 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 14 • 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 15 • On wireless remote controller 1 The continuous buzzer sounds from receiving section of indoor unit. 2 Blink of operation lamp • On wired remote controller 1 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 16 Note: Errors to be detected in outdoor unit, such as codes starting with F, U or E (excluding E0 to E7), are not covered in this document. Please refer to the outdoor unit's service manual 7-3. SELF-DIAGNOSIS ACTION TABLE for the details. Check code Abnormal point and detection method Countermeasure...
  • Page 17 Check code Abnormal point and detection method Countermeasure Cause Freezing/overheating protection is (Cooling or drying mode) (Cooling or drying mode) operating 1 Clogged filter (reduced airflow) 1 Check clogging of the filter. Freezing protection (Cooling mode) Short cycle of air path Remove blockage.
  • Page 18 Abnormal point and detection method Countermeasure Check code Cause Pipe temperature thermistor / Condenser / Evaporator (TH23) 1 The unit is in 3-minute resume protec- 1 Defective thermistor 1~ Check resistance value of thermistor. tion mode if short/open of thermistor is characteristics For characteristics, refer to (P1) above.
  • Page 19 Abnormal point and detection method Countermeasure Check code Cause Remote controller transmission error(E3)/signal receiving error(E5) 1 2 remote controllers are set as 1 Set a remote controller to main, and the 1 Abnormal if remote controller could not other to sub. “main.”...
  • Page 20 Check code Abnormal point and detection method Countermeasure Cause Forced compressor stop (due to water leakage abnormality) 1 When the intake temperature subtracted 1 Drain pump trouble 1 Check the drain pump. from liquid pipe temperature is less than -10°C, drain sensor detects whether it is 2 Drain defective 2 Please check whether water can be drained.
  • Page 21 7-4. TROUBLESHOOTING OF PROBLEMS Note: Refer to the manual of outdoor unit for the detail of remote controller. Phenomena Cause Countermeasure (1) LED2 on indoor controller board • When LED1 on indoor controller board is also off. 1 Check the voltage of outdoor power 1 Power supply of rated voltage is not supplied to out- is off.
  • Page 22 7-5. TEST POINT DIAGRAM 7-5-1. Indoor controller board SLZ-KA25VAL3.TH SLZ-KA35VAL3.TH SLZ-KA50VAL3.TH SLZ-KA25VAL3.TH-ER SLZ-KA35VAL3.TH-ER SLZ-KA50VAL3.TH-ER CN51 LED2 CNMF Centrally control Emergency Capacity Power supply Mode Fan motor output : Control signal operation setting (R.B) selection 13V pulse input ( : +) CN22 : Operation indicator Remote controller...
  • Page 23 7-6. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE Each function is controlled by the dip switch on control P.C. board. Model setting and capacity setting are memorised in the nonvolatile memory of the indoor controller board. ■ The black square ( ) indicates a switch position.
  • Page 24 7-7. TROUBLE CRITERION OF MAIN PARTS SLZ-KA25VAL3.TH SLZ-KA35VAL3.TH SLZ-KA50VAL3.TH SLZ-KA25VAL3.TH-ER SLZ-KA35VAL3.TH-ER SLZ-KA50VAL3.TH-ER Parts name Check method and criterion Room temperature Measure the resistance with a tester. thermistor (Parts temperature 10 to 30°C) (TH21) Normal Abnormal Pipe temperature 4.3 to 9.6 k" Opened or short-circuited thermistor/liquid (TH22)
  • Page 25 7-7-1. THERMIISTOR CHARACTERISTIC GRAPH <Thermistor Characteristic graph> •Room temperature thermistor (TH21) < Thermistor for lower temperature > Thermistor for •Pipe temperature thermistor/liquid (TH22) lower temperature •Condenser/evaporator temperature thermistor (TH23) Thermistor R =15 kΩ ± 3% Fixed number of B=3480 ± 2% Rt=15exp { 3480( 273+t 15 kΩ...
  • Page 26 7-7-2. DC FAN MOTOR (FAN MOTOR/ INDOOR CONTROLLER BOARD) Check method of DC fan motor (fan motor / indoor controller circuit board) Notes · High voltage is applied to the connector (CNMF) for the fan motor. Pay attention to the service. ·...

  • Page 27: Way Air Flow System

    4-WAY AIR FLOW SYSTEM 8-1. FRESH AIR INTAKE (LOCATION FOR INSTALLATION) At the time of installation, use the duct holes (cut out) located at the positions shown in following diagram, as and when required. Fresh air intake Detail drawing of fresh air intake [100 [73.4 3-[2.8 hole...
  • Page 28 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 29: Disassembly Procedure

    DISASSEMBLY PROCEDURE SLZ-KA25VAL3.TH SLZ-KA35VAL3.TH SLZ-KA50VAL3.TH SLZ-KA25VAL3.TH-ER SLZ-KA35VAL3.TH-ER SLZ-KA50VAL3.TH-ER 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 to open the air intake grille.
  • Page 30 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 5. Removing the room temperature thermistor (TH21) Photo 4 (1) Remove the panel. (Refer to procedure 3) Connectors Control box (2) Pull out the room temperature thermistor from the drain pan. Drain plug (3) Remove the 2 screws fixed to the control box cover, and remove the control box cover.
  • Page 31 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS Photo 7 9. Removing the drain pump (DP) and drain sensor (DS) Cover Screw (1) Remove the panel. (Refer to procedure 3 ) (2) Remove the drain pan. (Refer to procedure 6) (3) Remove the 2 screws fixed to the control box cover, and Control remove the control box cover.
  • Page 32 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2014 MITSUBISHI ELECTRIC CORPORATION New publication, effective Jun. 2014 Distributed in Jun. 2014 No.OCH564 Specifications are subject to change without notice. Made in Japan...

This manual is also suitable for:

Slz-ka25val3 seriesSlz-ka50val3 seriesSlz-ka35val3 seriesSlz-ka25val3.thSlz-ka25val3.th-erSlz-ka35val3.th ... Show all

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