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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
Indoor unit
[Model names]
SLZ-KA25VAQ
SLZ-KA35VAQ
SLZ-KA50VAQ
Model name
indication
INDOOR UNIT
WIRED REMOTE CONTROLLER
[Service Ref.]
SLZ-KA25VAQ.TH
SLZ-KA35VAQ.TH
SLZ-KA50VAQ.TH
TEMP.
ON/OFF
(Option)
December 2010
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.
CONTENTS
1. PART NAMES AND FUNCTIONS ....... 2
2. SPECIFICATIONS ............................... 5
3. OUTLINES AND DIMENSIONS ........... 7
4. WIRING DIAGRAM .............................. 9
5. REFRIGERANT SYSTEM DIAGRAM ..... 10
6. TROUBLESHOOTING ....................... 11
7. 4-WAY AIR FLOW SYSTEM .............. 23
8. DISASSEMBLY PROCEDURE .......... 25
PARTS CATALOG (OCB493)
No. OCH493
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Summary of Contents for Mitsubishi SLZ-KA25VAQ
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Page 1: Table Of Contents
No. OCH493 TECHNICAL & SERVICE MANUAL Indoor unit Note: [Model names] [Service Ref.] • This manual describes only service data of the indoor SLZ-KA25VAQ.TH units. SLZ-KA25VAQ • RoHS compliant products have <G> mark on the spec SLZ-KA35VAQ.TH name plate. SLZ-KA35VAQ •... -
Page 2: Part Names And Functions
The phrase “Wired remote controller” in this service manual refers only to the PAR-21MAA. If you need any information for the PAR-30MAA, please refer to the instruction book included in PAR-30MAA box. PART NAMES AND FUNCTIONS Indoor Unit SLZ-KA25VAQ.TH SLZ-KA35VAQ.TH SLZ-KA50VAQ.TH Filter Removes dust and pollutants from inhaled air. - 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-KA25VAQ.TH SLZ-KA35VAQ.TH SLZ-KA50VAQ.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 Day-of-Week “Sensor” indication 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.
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Page 5: Specifications
SPECIFICATIONS Indoor service ref. SLZ-KA35VAQ.TH SLZ-KA25VAQ.TH SLZ-KA50VAQ.TH Function Cooling Heating Cooling Cooling Heating Heating Single phase Single phase Single phase Power supply 230V, 50Hz 230V, 50Hz 230V, 50Hz Capacity Air flow (High/Medium/Low) 600/540/480 660/540/480 660/540/480 Power outlet Running current *1 0.35... - Page 6 NOISE CRITERION CURVES <50Hz> <50Hz> SLZ-KA25VAQ.TH SLZ-KA35VAQ.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...
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Page 7: Outlines And Dimensions
OUTLINES AND DIMENSIONS SLZ-KA25VAQ.TH SLZ-KA35VAQ.TH SLZ-KA50VAQ.TH Unit : mm Fresh air intake Detail drawing of fresh air intake Suspension bolt pitch 73.4 2.8 hole Cut out hole Burring hole Ceiling surface 15~37 576~620 Ceiling hole 15~37 Refrigerent Drain pipe pipe (gas) - Page 8 Unit : mm WIRED REMOTE CONTROLLER (Option)
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Page 9: Wiring Diagram
WIRING DIAGRAM SLZ-KA25VAQ.TH SLZ-KA35VAQ.TH SLZ-KA50VAQ.TH... -
Page 10: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM SLZ-KA25VAQ.TH SLZ-KA35VAQ.TH SLZ-KA50VAQ.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: 1 Check the power supply voltage. 2 Check 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: High
• 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 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...
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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 1 Defective thermistor 1–3 Check resistance value of thermistor. Room temperature thermistor (TH1) 0°C .. - Page 15 Abnormal point and detection method Countermeasure Error Code Cause Freezing/overheating protection is oper- (Cooling or drying mode) (Cooling or drying mode) 1 Clogged filter (reduced airflow) 1 Check clogging of the filter. ating 1 Freezing protection (Cooling mode) 2 Remove blockage. 2 Short cycle of air path 3 Low-load (low temperature) The unit is in 6-minute resume prevention...
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Page 16: Continuous
Abnormal point and detection method Countermeasure Error Code Cause Pipe temperature thermistor / Condenser / Evaporator (TH5) 1 The unit is in 3-minute resume protec- 1 Defective thermistor 1–3 Check resistance value of thermistor. tion mode if short/open of thermistor is characteristics For characteristics, refer to (P1) above. -
Page 17: Continuous
Abnormal point and detection method Countermeasure Error Code Cause Indoor/outdoor unit communication error (Signal receiving error) 1 Contact failure, short circuit or, 1 Check disconnection or looseness of indoor/ 1 Abnormal if indoor controller board miswiring (converse wiring) of outdoor unit connecting wire of indoor unit or cannot receive any signal normally for 6 indoor/outdoor unit connecting outdoor unit. - Page 18 6-4. TROUBLESHOOTING BY INFERIOR PHENOMENA 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 19 6-5. TEST POINT DIAGRAM 6-5-1. Indoor power board SLZ-KA25VAQ.TH SLZ-KA35VAQ.TH SLZ-KA50VAQ.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 3 220-240V AC...
- Page 20 6-5-2. Indoor controller board SLZ-KA25VAQ.TH SLZ-KA35VAQ.TH SLZ-KA50VAQ.TH CN2D LED1 Connector to the indoor LED2 LED3 Power supply Power supply power board (CN2S) Transmission (I.B) (R.B) (12.5~13.7V DC) (Indoor/outdoor) CN3C CN22 – Transmission Remote controller (Indoor/outdoor) connecting wire (0~24V DC) –...
- Page 21 6-6. TROUBLE CRITERION OF MAIN PARTS SLZ-KA25VAQ.TH SLZ-KA35VAQ.TH SLZ-KA50VAQ.TH Part name Check method and criterion Room temperature Measure the resistance with a tester. thermistor (Part temperature 10 °C ~ 30 °C) (TH1) Normal Abnormal Pipe temperature 4.3k ~ 9.6k Opened or short-circuited...
- Page 22 <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 =15kΩ ± 3% Fixed number of B=3480 ± 2% Rt=15exp { 3480( 273+t 15kΩ...
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Page 23: Way Air Flow System
Burring hole Ceiling surface Drain pipe Electrical Box Refrigerant pipe 7-2. FRESH AIR INTAKE AMOUNT & STATIC PRESSURE CHARACTERISTICS SLZ-KA25VAQ.TH SLZ-KA35VAQ.TH SLZ-KA50VAQ.TH Taking air into the unit How to read curves Duct characteristics Q … Designed amount of fresh air intake... -
Page 24: Ceiling
7-4. 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 25: Disassembly Procedure
DISASSEMBLY PROCEDURE SLZ-KA25VAQ.TH SLZ-KA35VAQ.TH SLZ-KA50VAQ.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 26 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 5. Removing the room temperature thermistor (TH1) Photo 4 (1) Remove the panel. (Refer to step 3) Connectors (2) Pull out the room temperature thermistor from the drain pan. Drain plug Control box (3) Remove the 2 screws fixed to the control box cover, and remove the control box cover.
- Page 27 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 9. Removing the drain pump (DP) and drain sensor (DS) Photo 7 Cover Screw (1) Remove the panel. (Refer to step 3) (2) Remove the drain pan. (Refer to step 6) (3) Remove the 2 screws fixed to the control box cover, and Control remove the control box cover.
- Page 28 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2010 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. New publication, effective Dec. 2010 Specifications subject to change without notice. Distributed in Dec. 2010 No.OCH493 Made in Japan...