Table of Contents
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Indoor unit
[Model names]
PKA-A24KA4
PKA-A30KA4
PKA-A36KA4
INDOOR UNIT
ON/OFF
TEMP
IR WIRELESS REMOTE
CONTROLLER
(Option)
[Service Ref.]
PKA-A24KA4.TH
PKA-A30KA4.TH
PKA-A36KA4.TH
TEMP.
ON/OFF
WIRED REMOTE
CONTROLLER
(Option)
CONTENTS
1. REFERENCE MANUAL ................................... 2
2. SAFETY PRECAUTION ................................... 3
3. PART NAMES AND FUNCTIONS ................... 4
4. SPECIFICATIONS ............................................ 7
5. NOISE CRITERION CURVES .......................... 8
6. OUTLINES AND DIMENSIONS ....................... 9
7. WIRING DIAGRAM ......................................... 10
8. REFRIGERANT SYSTEM DIAGRAM ............ 11
9. TROUBLESHOOTING .................................... 12
10. SPECIAL FUNCTION ..................................... 26
11. DISASSEMBLY PROCEDURE ....................... 29
PARTS CATALOG (OCB488)
9700058
May 2011
No. OCH488
REVISED EDITION-A
Revision:
• 6. OUTLINES AND
DIMENSIONS has been modi-
fied in REVISED EDITION-A.
• Some descriptions have been
modified.
• Please void OCH488.
Note:
• This manual describes only
service data of the indoor
units.
• RoHS compliant products
have <G> mark on the spec
name plate.
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric Mr. Slim PKA-A24KA4
Summary of Contents for Mitsubishi Electric Mr. Slim PKA-A24KA4
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Page 1: Table Of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SPLIT-TYPE, AIR CONDITIONERS May 2011 No. OCH488 REVISED EDITION-A SERVICE MANUAL Indoor unit Revision: [Model names] [Service Ref.] • 6. OUTLINES AND PKA-A24KA4.TH DIMENSIONS has been modi- PKA-A24KA4 fied in REVISED EDITION-A. • Some descriptions have been PKA-A30KA4.TH modified. -
Page 2: Reference Manual
REFERENCE MANUAL OUTDOOR UNIT SERVICE MANUAL Service Ref. Service Manual No. PUZ-A24/30/36NHA4 OCH481 PUZ-A24/30/36NHA4-BS PUY-A24/30/36NHA4 OCB481 PUY-A24/30/36NHA4-BS Remote controller (Optional parts) Radio frequency interface Wired remote controller IR wireless remote controller COOL AUTO HEAT RF thermostat TEMP. ON/OFF... -
Page 3: Safety Precaution
SAFETY PRECAUTION 2-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must be disconnected. 2-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilising refrigerant R410A Use a vacuum pump with a reverse flow check Use new refrigerant pipes. valve. -
Page 4: Part Names And Functions
[1] Cautions for service (1) Perform service after recovering the refrigerant left in unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. (4) When performing service, install a filter drier simultaneously. Be sure to use a filter drier for new refrigerant. -
Page 5: Operation Section
Wired remote controller (Option) “Sensor” indication Display Section Day-of-Week Displays when the remote controller sensor is used. Shows the current day of the week. For purposes of this explanation, all parts of the display are shown. Time/Timer Display During actual operation, only “Locked”... -
Page 6: Clock Button
IR wireless remote controller (Option) CHECK TEST RUN display Indicate that the unit is being checked or test-run. MODEL SELECT display display Blinks when model is selected. Lights up while the signal is transmitted to the indoor unit when the button is pressed. Temperature setting display Indicates the desired temperature setting which is set. -
Page 7: Specifications
SPECIFICATIONS Service Ref. PKA-A24KA4.TH Power supply(phase, cycle, voltage) 1 phase, 60Hz, 208/230V Max. Fuse Size Min.Circuit Ampacity External finish White Munsell 1.0Y 9.2/0.2 Heat exchanger Plate fin coil Line flow fan (direct) × 1 Fan(drive) Fan motor output 0.056 0.36 Fan motor F.L.A Dry: 18-20-22 (635-705-775) -
Page 8: Noise Criterion Curves
NOISE CRITERION CURVES PKA-A24KA4.TH PKA-A36KA4.TH PKA-A24KA SPL(dB) LINE NOTCH NOTCH SPL(dB) LINE PKA-A30KA4.TH High High PKA-A30KA PKA-A24KAL PKA-A30KAL 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 9: Outlines And Dimensions
OUTLINES AND DIMENSIONS PKA-A24KA4.TH PKA-A30KA4.TH PKA-A36KA4.TH Unit: inch (mm) Top side 16-11/16(423.7) 17(431.7) Left side Right side Front side Mount board Knockout hole for left piping 9-1/2(241) 2-29/32(74) 33-21/32(855) 3/16(5) 11-5/8(295) 46-1/16(1170) Operation lamp Front side(Grille open) Knockout hole for right piping DEFROST/STAND BY lamp Receiver Terminal block for Outdoor unit... -
Page 10: Wiring Diagram
WIRING DIAGRAM PKA-A24KA4.TH PKA-A30KA4.TH PKA-A36KA4.TH [Explanation of symbols] Symbol Name Symbol Name Indoor controller board Vane motor CN2L Connector (LOSSNAY) Fan motor CN30 Connector (LLC) Switch board CN32 Connector ( Remote switch) SWE2 Emergency operation CN41 Connector (HA terminal-A) Terminal block(Indoor unit Power (option)) CN51 Connector (Centrally control) Terminal block (Indoor/outdoor connecting line) -
Page 11: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM PKA-A24KA4.TH PKA-A30KA4.TH PKA-A36KA4.TH Strainer (#50) Heat exchanger Refrigerant GAS pipe connection (Flare) Thermistor TH2 Refrigerant flow in cooling Pipe temperature(Liquid) Refrigerant flow in heating Thermistor TH5 (Cond./ Eva.temperature) Refrigerant LIQUID pipe connection (Flare) Thermistor TH1 (Room temperature) Strainer (#50) Distributor with strainer (#50/#100) -
Page 12: Troubleshooting
TROUBLESHOOTING 9-1. TROUBLESHOOTING <Error code display by self-diagnosis and actions to be taken for service (summary)> Present and past error codes are logged and displayed on the wired remote controller or controller board of outdoor unit. Actions to be taken for service and the trouble reoccurrence at field are summarized in the table below. Check the contents below before investigating details. - Page 13 9-2. MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER <In case of trouble during operation> When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop. < Malfunction-diagnosis method at maintenance service> ■...
- 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 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 in the LCD. (Refer to the previous page, check code.) • 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 16: Self-Diagnosis Action Table
Note: Refer to the manual of outdoor unit for the details of display 9-3. SELF-DIAGNOSIS ACTION TABLE such as F, U, and other E. Abnormal point and detection method Countermeasure Error Code Cause Room temperature thermistor (TH1) Defective thermistor – Check resistance value of thermistor. - Page 17 Abnormal point and detection method Countermeasure Error Code Cause Freezing/overheating protection is (Cooling or drying mode) (Cooling or drying mode) operating Clogged filter (reduced airflow) Check clogs of the filter. Freezing protection (Cooling mode) Short cycle of air path Remove blockage. The unit is in 6-minute resume prevention Low load (low temperature) mode if pipe <liquid or condenser/evapo-...
- Page 18 Abnormal point and detection method Countermeasure Error Code Cause Pipe temperature thermistor/ Defective thermistor – Check resistance value of thermistor. Condenser-Evaporator (TH5) characteristics For characteristics, refer to (P1) above. The unit is in 3-minute resume protec- Contact failure of connector Check contact failure of connector (CN44) on the indoor controller board.
- Page 19 Abnormal point and detection method Countermeasure Error Code Cause Remote controller transmission error(E3)/signal receiving error(E5) 2 remote controllers are set as Set a remote controller to main, and the “main.” Abnormal if remote controller could not other to sub. find blank of transmission path for 6 sec- (In case of 2 remote con- onds and could not transmit.
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Page 20: Troubleshooting By Inferior Phenomena
9-4. TROUBLESHOOTING BY INFERIOR PHENOMENA Note: Refer to the manual of outdoor unit for the detail of remote controller. Phenomena Cause Countermeasure (1)Upward/downward vane The vane is not downward during defrosting and heat Normal operation (The vane is set to performance failure preparation and when the thermostat is OFF in HEAT horizontal regardless of remote control.) -
Page 21: Emergency Operation
9-5. EMERGENCY OPERATION 9-5-1. When IR wireless remote controller fails or its battery is exhausted When the remote controller cannot be used When the batteries of the remote controller run out or the remote controller malfunctions, the emergency operation can be done using the emergency buttons. - Page 22 9-6. HOW TO CHECK THE PARTS PKA-A24KA4.TH PKA-A30KA4H.TH PKA-A36KA4.TH Parts name Check points Room temperature Disconnect the connector then measure the resistance using a tester. thermistor (TH1) (At the ambient temperature 50 F~86 F) Liquid pipe thermistor Normal Abnormal (TH2) (Refer to the next page for a detail.) 4.3k ~9.6k Open or short...
- Page 23 9-6-2. DC Fan motor (fan motor/indoor controller circuit board) Check method of DC fan motor (fan motor/indoor controller circuit board) Notes · High voltage is applied to the connecter (CNMF) for the fan motor. Pay attention to the service. · Do not pull out the connector (CNMF) for the motor with the power supply on. (It causes trouble of the indoor controller circuit board and fan motor.) Self check...
- Page 24 9-7. TEST POINT DIAGRAM Indoor controller board PKA-A24KA4.TH PKA-A30KA4.TH PKA-A36KA4.TH CNMF Connect to the fan motor (MF) 1-3 : DC294~325V 4-3 : DC15V 5-3 : DC0~6.5V 6-3 : DC0 or DC15V CN105 CN01 Connect to the (Radio frequency Terminal block (TB4) interface) 1-3 : 208/230VAC Emergency...
- Page 25 9-8. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE Each function is controlled by the dip switch and the jumper wire on control P.C. board. ■ The black square ( ) indicates a switch position. Jumper wire Setting by the dip switch and jumper wire Remarks Functions MODELS...
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Page 26: Special Function
SPECIAL FUNCTION 10-1. Rotation Function (and back-up function, 2nd stage cut-in function) This function is only available when using wired remote controller. 10-1-1. 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 27 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 28 (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.
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Page 29: Disassembly Procedure
DISASSEMBLY PROCEDURE PKA-A24KA4.TH PKA-A30KA4.TH PKA-A36KA4.TH Be careful when removing heavy parts. OPERATION PROCEDURE PHOTOS & ILLUSTRATIONS 1. REMOVING THE PANEL Front grille Screws Photo 1 (1) Press and unlock the knobs on both sides of the front grille and lift the front grille until it is level. Pull the hinges forward to remove the front grille. - Page 30 OPERATION PROCEDURE PHOTOS Terminal block (TB4) 3. REMOVING THE ELECTRICAL BOX Photo 4 (1) Remove the panel and the corner box. (Refer to step 1) (2) Remove the front and side electrical box covers (each 1 Indoor controller screw). board (I.B.) (3) Remove the indoor / outdoor connecting wire from termi- Connector nal block (TB4).
- Page 31 OPERATION PROCEDURE PHOTOS 6. REMOVING THE INDOOR FAN MOTOR AND THE Photo 7 Screw of the motor band LINE FLOW FAN (1) Remove the panel and the corner box. (Refer to step 1) Lead wire of pipe thermistor (2) Remove the electrical box (Refer to step 2) and the nozzle assembly (Refer to step 3).
- Page 32 Room temp. thermistor (TH1) HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2010 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Distributed in May 2011 No.OCH488 REVISED EDITION-A New publication, effective May 2011 Distributed in Nov. 2010 No.OCH488...