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Mitsubishi Electric Mr.Slim PEA-A12AA4 Technical & Service Manual

Split-type, heat pump air conditioners pea series ceiling concealed indoor units
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
Indoor unit
[Model names]
INDOOR UNIT
PEA-A12AA4
PEA-A18AA4
Model name
indication
December 2010
REVISED EDITION-B
CONTENTS
1. PART NAMES AND FUNCTIONS ········2
2. SPECIFICATIONS·································3
3. OUTLINES AND DIMENSIONS············8
4. WIRING DIAGRAM ·······························9
6. HEATER CONTROL ···························11
7. TROUBLESHOOTING·························14
8. DISASSEMBLY PROCEDURE ···········25
CM
No.HWE0807B

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Summary of Contents for Mitsubishi Electric Mr.Slim PEA-A12AA4

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS December 2010 No.HWE0807B REVISED EDITION-B TECHNICAL & SERVICE MANUAL Indoor unit [Model names] PEA-A12AA4 PEA-A18AA4 CONTENTS 1. PART NAMES AND FUNCTIONS ········2 2. SPECIFICATIONS·································3 3. OUTLINES AND DIMENSIONS············8 4. WIRING DIAGRAM ·······························9 5. REFRIGERANT SYSTEM DIAGRAM·······10 Model name 6.

  • Page 2: Part Names And Functions

    PART NAMES AND FUNCTIONS Indoor Unit PEA-A12AA4 PEA-A18AA4 Air outlet Air outlet duct flange Air inlet...

  • Page 3: Specifications

    SPECIFICATIONS PEA-A12AA4 PEA-A18AA4 Model Name Capacity Cooling Heating Cooling Heating BTU/h 12000 18000 19000 Power source 208/230V (60Hz) 208/230V (60Hz) Power input 0.07 0.09 0.07 Current 0.57 0.74 0.63 Temperature set range Remote controller ˚ F( ˚ C) 67 to 86 (19 to 30) 67 to 86 (19 to 30) 63 to 83 (17 to 28) Airflow direction...
  • Page 4 SOUND CRITERION CURVES <60Hz> <60Hz> PEA-A12AA4 PEA-A12AA4 NOTCH LINE NOTCH LINE SPL(dB) SPL(dB) External static pressure : High External static pressure : High Middle Middle 0.020[in.WG](5Pa) 0.060[in.WG](15Pa) NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE TERESHOLD OF TERESHOLD OF HEARING FOR HEARING FOR...
  • Page 5 <60Hz> <60Hz> PEA-A18AA4 PEA-A18AA4 NOTCH SPL(dB) LINE NOTCH SPL(dB) LINE High High External static pressure : External static pressure : Middle Middle 0.020[in.WG](5Pa) 0.060[in.WG](15Pa) NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE TERESHOLD OF TERESHOLD OF HEARING FOR HEARING FOR NC-20...
  • Page 6 INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW PEA-A12AA4 PEA-A12AA4 (External static pressure 0.020[in.WG](5Pa) 208/230V 60Hz (External static pressure 0.060[in.WG](15Pa) 208/230V 60Hz [0.16] [0.20] [0.16] [0.12] Limit [0.12] Limit [0.08] High [0.08] High Middle Rated point [0.04] Middle [0.04] Rated point [212] [247] [282]...
  • Page 7 PEA-A18AA4 PEA-A18AA4 (External static pressure 0.020[in.WG](5Pa) 208/230V 60Hz (External static pressure 0.060[in.WG](15Pa) 208/230V 60Hz [0.20] [0.16] Limit Limit [0.16] [0.12] High [0.12] Middle [0.08] High [0.08] Middle Rated point [0.04] [0.04] Rated point [318] [353] [388] [424] [459] [494] [530] [565] [600] [636] [671] [318] [353] [388]...

  • Page 8: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PEA-A12AA4 Unit : mm(in.) PEA-A18AA4 Drain pipe(O.D.ø32(1-1/4)) 345(13-19/32) (Emergency draining) 37(1-15/32) 100 (3-15/16) Suspension bolt hole 157.5 (6-7/32) 20 (13/16) 4-14X30(9/16X1-3/16) Slot 37(1-15/32) 12(1/2) 15(19/32) 2XE-ø2.9(1/8) L-ø2.9(1/8) inlet outlet Air filter 10 (13/32) 625 (Suspension bolt pitch) (1-15/16) (24-5/8) Drain pipe(O.D.ø32(1-1/4))

  • Page 9: Wiring Diagram

    WIRING DIAGRAM PEA-A12AA4 PEA-A18AA4 INSIDE SECTION OF CONTROL BOX I. B. CN01 (BLACK) CN3C (BLUE) CN24 CN32 (YELLOW) CN51 CN41 DC294-340V FUSE (RED) RECTIFY CIRCUIT CN2L CN22 (BLUE) ON OFF LED2 LED3 LED1 (WHITE) (RED) (WHITE) (WHITE) (RED) (WHITE) CN90 CN105 CN4F CN44...

  • Page 10: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PEA-A12AA4 PEA-A18AA4 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 Distributor...

  • Page 11: Heater Control

    HEATER CONTROL 6-1. Control specifications and Function setting Table 1 shows how the field-installed heater is controlled. Select the desired pattern in the table below, and set the Function on the indoor units as shown in Table 1. Table.1 [Function table] Select unit numbers 01 to 03 or all units (AL[wired remote controller] / 07[IR wireless remote controller]) Mode Setting...
  • Page 12 6-3. PAC-YU25HT (Optional Parts) installation The following section describes installation of the External Heater Adapter that connects to PEA-A AA4 series indoor unit. This products is the special wiring parts to drive an electric heater with the air conditioner. (1) Parts list Check that the following parts are included in the package.
  • Page 13 For relay X use the specifications given below Operation coil Rated voltage: 12VDC Power consumption: 0.9W or less * Use the diode that is recommended by the relay manufacturer at both ends of the relay coil. The length of the electrical wiring for the PAC-YU25HT is 2 meters (6-1/2 ft.) To extend this length, use sheathed 2-core cable.

  • Page 14: Troubleshooting

    TROUBLESHOOTING 7-1. CAUTIONS ON TROUBLESHOOTING (1) Before troubleshooting, check the followings: 1 Check the power supply voltage. 2 Check the indoor/outdoor connecting wire for mis-wiring. (2) Take care 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 15 7-2. SELF-CHECK FUNCTION • Refer to the installation manual that comes with each remote controller for details. • RF thermostat is not established. [Output pattern A] Errors detected by indoor unit Wired remote controller IR wireless remote controller RF thermostat Symptom Remark Beeper sounds/OPERATION...

  • Page 16: Auto Restart Function

    For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table. LED 1 (power for microcomputer) Indicates whether control power is supplied. Make sure that this LED is always lit. LED 2 (power for remote controller) Indicates whether power is supplied to the remote controller.
  • Page 17 Note: Refer to the manual of outdoor unit for the details of display 7-3. 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) characteristics...
  • Page 18 Abnormal point and detection method Countermeasure Error Code Cause Freezing/overheating protection is (Cooling or drying mode) (Cooling or drying mode) 1 Clogged filter (reduced airflow) 1 Check clogging of the filter. working 1 Freezing protection (Cooling mode) 2 Short cycle of air path 2 Remove shields.
  • Page 19 Abnormal point and detection method Countermeasure Error Code Cause 1 Defective thermistor 1–3 Check resistance value of thermistor. Abnormality of pipe temperature ther- mistor / Condenser-Evaporator (TH5) characteristics For characteristics, refer to (P1) above. 1 The unit is in three-minute resume pro- 2 Check contact failure of connector (CN44) 2 Contact failure of connector on the indoor controller board.
  • Page 20 Abnormal point and detection method Countermeasure Error Code Cause ∗ Check LED display on the outdoor control cir- 1 Contact failure, short circuit or, Indoor/outdoor unit communication error (Signal receiving error) cuit board. (Connect A-control service tool, mis-wiring (converse wiring) of 1 Abnormal if indoor controller board PAC-SK52ST.) indoor/outdoor unit connecting...
  • Page 21 7-4. 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 Power supply of rated voltage is not supplied to out- 1 Check the voltage of outdoor power is off.
  • Page 22 7-5. TEST POINT DIAGRAM 7-5-1. Indoor controller board PEA-A12AA4 PEA-A18AA4 Fuse(6.3A 250V) CN01 Power supply voltage (208 - 230VAC) Emergency operation Model selection Capacity setting CN01 CN105 Radio frequency interface CN32 Remote start/stop adapter CN24 Heater control (12VDC) CN22 For MA remote controller cable con- nection (10 - 13 VDC (Between 1 and 3.)) CNMF...
  • Page 23 7-6. TROUBLE CRITERION OF MAIN PARTS PEA-A12AA4 PEA-A18AA4 Part name Check method and criterion Room temperature Measure the resistance with a tester. thermistor (Part temperature 10°C(50°F) ~ 30°C(86°F)) (TH1) Normal Abnormal Pipe temperature 8kΩ~20kΩ Opened or short-circuited thermistor/liquid (TH2) Condenser/evaporator temperature thermistor (TH5) Wiring diagram...
  • Page 24 7-7. 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 connecter (CNMF) for the fan motor. Give attention to the service. ·...

  • Page 25: Disassembly Procedure

    DISASSEMBLY PROCEDURE Exercise caution when removing heavy parts. PEA-A12AA4 PEA-A18AA4 1. Control box 1. Removing the control box cover (1) Remove the two fixing screws on the cover (A) to remove it. Fig. 1 Fig. 2 2. Thermistor (Intake air) 1.
  • Page 26 Exercise caution when removing heavy parts. 3. Drainpan 1. Removing the filter and the bottom plate (1) Push up the tab on the filter, and pull out the filter in the direction of the arrow 1. (2) Remove the fixing screws on the bottom plate (D), (E) to remove it.
  • Page 27 Exercise caution when removing heavy parts. 4. Thermistor (Condenser / evaporator) (Liquid pipe) 1. Remove the drain pan according to the proce- dure in section [3]. 2. Removing the Heat exchanger cover (1) Remove the four fixing screws on the heat exchanger cover (F) to remove it.
  • Page 28 Exercise caution when removing heavy parts. 5. Fan and fan motor 1. Removing the filter and the bottom plate (1) Push down the tab on the filter, and pull out the filter in the direction of the arrow 1. (2) Remove the fixing screws on the bottom plate (J) to remove it.
  • Page 29 Exercise caution when removing heavy parts. 6. Bearing [PEA-A18AA4 model only] 1. Removing the bearing (1) Remove the two fixing screws on the bearing cover (K) to remove it. Fig. 13 (2) Remove the two bearing retainer screws to remove the bearing. Fig.
  • Page 32 New publication, effective Dec. 2010. Specifications subject to change without notice. HWE0807B First edition published in Oct. 2008.

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Mr.slim pea-a18aa4

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