Mitsubishi Electric Mr.SLIM PKA-A12HA4 Service Manual

Split-type, heat pump air conditioners and split-type, air conditioners

Hide thumbs Also See for Mr.SLIM PKA-A12HA4:

Installation manual (44 pages)

Table of Contents

Quick Links

Troubleshooting

Need help?

Do you have a question about the Mr.SLIM PKA-A12HA4 and is the answer not in the manual?

Questions and answers

Summary of Contents for Mitsubishi Electric Mr.SLIM PKA-A12HA4

Page 1: Table Of Contents
November 2010 No. OCH483 SERVICE MANUAL Indoor unit [Model names] [Service Ref.] NOTE: • This manual describes PKA-A12HA4 PKA-A12HA4 only service data of the indoor units. PKA-A18HA4 • RoHS compliant products PKA-A18HA4 have <G> mark on the spec name plate.
Page 2: Cool
REFERENCE MANUAL 1-1. OUTDOOR UNIT SERVICE MANUAL Service Ref. Service Manual No. PUZ-A18/24/36NHA4 OCH481 PUZ-A18/24/36NHA4-BS PUY-A12/18/24/36NHA4 OCB481 PUY-A12/18/24/36NHA4-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 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: 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-A12HA4 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 Fan(drive) Line flow fan (direct) 0.030 Fan motor output Fan motor 0.33 F.L.A...
Page 8: Noise Criterion Curves
NOISE CRITERION CURVES PKA-A12HA4 SPL(dB) LINE NOTCH PKA-A18HA4 High 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-A12HA4 PKA-A18HA4 Unit: inch (mm) 15-3/16(387) 7-1/2(192) Top side Mount board 23-9/16(599) Front side Right side Left side 9-13/16(249) 3/16(5) 27-1/16(688) 2-1/8 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-A12HA4 PKA-A18HA4 [LEGEND] 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))
Page 11: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM PKA-A12HA4 PKA-A18HA4 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)
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: Wired Remote Controller
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> ■IR wireless remote controller [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 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...
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. Check contact failure of connector (CN44) on The unit is in 3-minute resume protec- Contact failure of connector 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.” other to sub. Abnormal if remote controller could not find blank of transmission path for 6 sec- (In case of 2 remote con- onds and could not transmit.
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-A12HA4 PKA-A18HA4 Parts name Check points Room temperature Disconnect the connector then measure the resistance with 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...
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. board and fan motor.) (It causes trouble of the indoor controller circuit Self check...
Page 24 9-7. TEST POINT DIAGRAM Indoor controller board PKA-A12HA4 PKA-A18HA4 CNMF Connect to the fan motor (MF) 1-3 : DC294~325V CN105 4-3 : DC15V 5-3 : DC0~6.5V (Radio frequency interface) 6-3 : DC0 or DC15V CN01 Connect to the Terminal block (TB4)
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. Setting by the dip switch and jumper wire Jumper wire Remarks Functions...
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.
Page 29: Disassembly Procedure
DISASSEMBLY PROCEDURE PKA-A12HA4 PKA-A18HA4 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 30: Operation Procedure
OPERATION PROCEDURE PHOTOS 3. REMOVING THE INDOOR CONTROLLER BOARD Photo 3 AND IR WIRELESS CONTROLLER BOARD Screw (side cover) Electrical box Screw (top cover) cover (top) (1) Remove the front panel. (Refer to step 2) Electrical box (2) Remove the room temp. thermistor TH1. (see Photo 3) cover (side) (3) Remove the electrical box covers (screw 4 ×...
Page 31 OPERATION PROCEDURE PHOTOS Electrical box cover (side) 5. REMOVING THE NOZZLE ASSEMBLY (with VANE Photo 7 Electrical box cover (top) and VANE MOTOR) AND DRAIN HOSE Screw (side cover) Screw (top cover) (1) Remove the front panel (Refer to step 2). (2) Remove the electrical box cover.
Page 32 OPERATION PROCEDURE PHOTOS 8. REMOVING THE LIQUID PIPE THERMISTOR AND Photo 12 Condenser/evaporator temp. thermistor (TH5) COND/EVA TEMP. THERMISTOR (1) Remove the front panel. (Refer to step 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 2010 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. New publication, effective Nov. 2010 Distributed in Nov. 2010 No.OCH483 Specifications subject to change without notice Made in Japan...

This manual is also suitable for:

Mr.slim pka-a18ha4