Table of Contents
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Indoor unit
[Model names]
[Service Ref.]
PKA-A12HA
PKA-A12HA
PKA-A18HA
PKA-A18HA
PKA-A12HAL
PKA-A12HAL
PKA-A18HAL
PKA-A18HAL
INDOOR UNIT
TEMP.
ON/OFF
WIRED REMOTE
CONTROLLER
COOL
DRY
AUTO
FAN
HEAT
WIRELESS REMOTE
CONTROLLER
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 ..................................... 27
11. DISASSEMBLY PROCEDURE ....................... 30
PARTS CATALOG (OCB456)
3 3 2 2 3
March 2009
No. OCH456
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 PKA-A12HA
Summary of Contents for Mitsubishi Electric PKA-A12HA
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Page 1: Table Of Contents
March 2009 No. OCH456 SERVICE MANUAL Indoor unit [Model names] [Service Ref.] NOTE: • This manual describes PKA-A12HA PKA-A12HA only service data of the indoor units. • RoHS compliant products PKA-A18HA PKA-A18HA have <G> mark on the spec name plate. -
Page 2: Reference Manual
REFERENCE MANUAL 1-1. OUTDOOR UNIT SERVICE MANUAL Service Ref. Service Manual No. PUZ-A18/24/36NHA3 OCH458 PUZ-A18/24/36NHA3-BS PUY-A12/18/24/36NHA3 OCB458 PUY-A12/18/24/36NHA3-BS OCH426 PUZ-HA36NHA2 OCB426 1-2. TECHNICAL DATA BOOK Series (Outdoor unit) Data Book No. PUZ-A·NHA3(-BS) OCS14 PUY-A·NHA3(-BS) PUZ-HA·NHA2 OCS15... -
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 new refrigerant pipes. Do not use refrigerant other than R410A. If other refrigerant (R22 etc.) is used, chlorine in refrige- rant can cause deterioration of refrigerant oil etc. -
Page 4: Part Names And Functions
Unit Gravimeter [3] Service tools Use the below service tools as exclusive tools for R410A refrigerant. Tool name Specifications Gauge manifold · Only for R410A · Use the existing fitting specifications . (UNF1/2) · Use high-tension side pressure of 5.3MPa·G or over. Charge hose ·... -
Page 5: Wired Remote Controller
Wired remote controller “Sensor” indication Display Section Day-of-Week Displayed 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 as lit. During actual operation, only “Locked”... -
Page 6: Wireless Remote Controller
Wireless remote controller 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-A12HA, PKA-A12HAL 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) Fan(drive) Fan motor output 0.030 0.33 Fan motor F.L.A... -
Page 8: Noise Criterion Curves
NOISE CRITERION CURVES PKA-A12HA SPL(dB) LINE NOTCH PKA-A18HA High PKA-A12HAL PKA-A18HAL NC-70 NC-60 NC-50 NC-40 NC-30 APPROXIMATE THRESHOLD OF HEARING FOR NC-20 CONTINUOUS NOISE 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz UNIT WALL 3.3ft 3.3ft MICROPHONE... -
Page 9: Outlines And Dimensions
OUTLINES AND DIMENSIONS PKA-A12HA PKA-A12HAL PKA-A18HA PKA-A18HAL Unit: inch (mm) 15-3/16(387) 7-1/2(192) Top side Mount board 23-9/16(599) Front side Right side 9-13/16(249) 3/16(5) Left side 2-1/8 27-1/16(688) 6-1/16(155) (55) Knock out hole 35-3/8(898) Knock out hole for left piping for right piping... -
Page 10: Wiring Diagram
WIRING DIAGRAM PKA-A12HA PKA-A18HA PKA-A12HAL PKA-A18HAL [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) -
Page 11: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM PKA-A12HA PKA-A18HA PKA-A12HAL PKA-A18HAL 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) -
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> [Procedure] 1.
- 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 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 work- (Cooling or drying mode) (Cooling or drying mode) Clogged filter (reduced airflow) Check clogs of the filter. Freezing protection (Cooling mode) Short cycle of air path Remove shields. 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)LED2 on indoor controller board • When LED1 on indoor controller board is also off. is off. Power supply of rated voltage is not supplied to out- Check the voltage of outdoor power door unit. - Page 21 Note: Refer to the manual of outdoor unit for the detail of remote controller. Phenomena Cause Countermeasure (2)LED2 on indoor controller board • When LED1 on indoor controller board is also blinking. Check indoor/outdoor unit connecting wire is blinking. Connection failure of indoor/outdoor unit connecting for connection failure.
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Page 22: Emergency Operation
9-5. EMERGENCY OPERATION 9-5-1. When 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 23 9-6. HOW TO CHECK THE PARTS PKA-A12HA PKA-A18HA PKA-A12HAL PKA-A18HAL 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.)
- Page 24 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. board and fan motor.) (It causes trouble of the indoor controller circuit Self check...
- Page 25 9-7. TEST POINT DIAGRAM Indoor controller board PKA-A12HA PKA-A18HA CNMF PKA-A12HAL PKA-A18HAL Connect to the fan motor (MF) 1-3 : DC294~325V 4-3 : DC15V 5-3 : DC0~6.5V 6-3 : DC0 or DC15V CN01 Connect to the Terminal block (TB4) 1-3 : 208/230VAC...
- Page 26 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. (Marks in the table below) Jumper wire ( : Short : Open) Jumper wire Setting by the dip switch and jumper wire Functions Remarks MODELS...
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Page 27: Special Function
SPECIAL FUNCTION 10-1. Rotation Function (and back-up function, 2nd stage cut-in function) Only PKA-A·HA (Wired remote controller use model) 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 28 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 29 (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 30: Disassembly Procedure
DISASSEMBLY PROCEDURE PKA-A12HA PKA-A18HA PKA-A12HAL PKA-A18HAL Be careful when removing heavy parts. OPERATION PROCEDURE PHOTOS & ILLUSTRATIONS 1. REMOVING THE LOWER SIDE OF THE INDOOR Figure 1 UNIT FROM THE INSTALLATION PLATE (1) Remove the front panel. (2) Insert the screw driver to the corner hole at both left and right side as shown in the figure 1. -
Page 31: Operation Procedure
OPERATION PROCEDURE PHOTOS 3. REMOVING THE INDOOR CONTROLLER BOARD Photo 3 AND WIRELESS CONTROLLER BOARD Electrical box cover (top) Electrical box Screw (side cover) cover (side) Screw (top cover) (1) Remove the front panel. (Refer to 2.) (2) Remove the room temp. thermistor TH1. (see Photo 3) (3) Remove the electrical box covers (screw 4 ×... - Page 32 OPERATION PROCEDURE PHOTOS Electrical box cover (side) 5. REMOVING THE NOZZLE ASSEMBLY (with VANE Photo 8 Electrical box cover (top) and VANE MOTOR) AND DRAIN HOSE Screw (side cover) Screw (top cover) (1) Remove the front panel (Refer to 2.). (2) Remove the electrical box cover.
- Page 33 OPERATION PROCEDURE PHOTOS Photo 13 Condenser/evaporator temp. 8. REMOVING THE LIQUID PIPE THERMISTOR AND thermistor (TH5) COND/EVA TEMP. THERMISTOR (1) Remove the front panel. (Refer to 2) Heat exchanger (2) Remove the electrical box cover. (3) Remove the motor band. (4) Cut the wiring fixed band.
- Page 36 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2009 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Distributed in Mar. 2009 No.OCH456 PDF 7 Made in Japan New publication, effective Mar. 2009 Specifications subject to change without notice...