Mitsubishi PEAD-A24AA4 Service Manual
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Mitsubishi PEAD-A24AA4 Service Manual

Split-type, heat pump air conditioners
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SPLIT-TYPE, HEAT PUMP
AIR CONDITIONERS

SERVICE MANUAL

Series PEAD
<indoor unit> Service ref.
Models
PEAD-A24AA4
PEAD-A30AA4
PEAD-A36AA4
PEAD-A42AA4
INDOOR UNIT
R410A
CONTENTS
1. SAFETY PRECAUTION ····························· 2
2. PART NAMES AND FUNCTIONS ·············· 3
3. SPECIFICATION ········································ 4
4. FAN PERFORMANCE AND
CORRECTED AIR FLOW ·························· 6
5. SOUND PRESSURE LEVELS ···················1 1
6. OUTLINES & DIMENSIONS ······················15
7. WIRING DIAGRAM ····································16
9. HEATER CONTROL ··································17
10. TROUBLESHOOTING ·······························20
11. DISASSEMBLY PROCEDURE ··················33
2010
NOTE:
• This manual describes only
service data of the indoor
units.
TM

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Summary of Contents for Mitsubishi PEAD-A24AA4

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP 2010 AIR CONDITIONERS SERVICE MANUAL Series PEAD R410A <indoor unit> Service ref. NOTE: Models PEAD-A24AA4 • This manual describes only service data of the indoor PEAD-A30AA4 units. PEAD-A36AA4 PEAD-A42AA4 CONTENTS 1. SAFETY PRECAUTION ····························· 2 2. PART NAMES AND FUNCTIONS ·············· 3 3.

  • Page 2: Safety Precaution

    SAFETY PRECAUTION 1-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must be disconnected. 1-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilising refrigerant R410A Use new refrigerant pipes. Do not use refrigerant other than R410A. In case of using the existing pipes for R22, be careful with If other refrigerant (R22 etc.) is used, chlorine in refrige- the followings.

  • Page 3: 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 4: Specification

    SPECIFICATION Service Ref. PEAD-A24AA4 Power supply (phase, cycle, voltage) 1 phase, 60Hz, 208/230V Max. Fuse Size Min. Circuit Ampacity 2.63 External finish Galvanized sheets Heat exchanger Plate fin coil Fan (drive) × No. Sirocco fan × 2 an motor output 0.121...
  • Page 5 Service Ref. PEAD-A42AA4 Power supply (phase, cycle, voltage) 1 phase, 60Hz, 208/230V Max. Fuse Size Min. Circuit Ampacity 3.50 External finish Galvanized sheets Heat exchanger Plate fin coil Fan (drive) × No. Sirocco fan × 2 an motor output 0.244 F.L.A 2.80 Fan motor...

  • Page 6: Fan Performance And Corrected Air Flow

    FAN PERFORMANCE AND CORRECTED AIR FLOW PEAD-A24AA4 PEAD-A24AA4 (External static pressure 35Pa) 208-230V 60Hz (External static pressure 100Pa) 208-230V 60Hz [0.241] [0.602] [0.201] Limit Limit Rated point [0.161] [0.401] Rated point High [0.120] High Middle [0.080] Middle [0.201] [0.040] [353]...
  • Page 7 PEAD-A30AA4 PEAD-A30AA4 (External static pressure 35Pa) 208-230V 60Hz (External static pressure 100Pa) 208-230V 60Hz [0.281] [0.602] [0.241] Limit High Limit Rated point [0.201] High [0.401] [0.161] Rated point Middle Middle [0.120] [0.201] [0.080] [0.040] [353] [530] [706] [883] [1059] [353] [530] [706] [883]...
  • Page 8 PEAD-A36AA4 PEAD-A36AA4 (External static pressure 35Pa) 208-230V 60Hz (External static pressure 100Pa) 208-230V 60Hz [0.281] [0.602] Limit Limit [0.241] High [0.201] Rated point [0.401] Middle [0.161] Rated point [0.120] High Middle [0.201] [0.080] [0.040] [353] [530] [706] [883] [1059] [1236] [1412] [1589] [353]...
  • Page 9 PEAD-A42AA4 PEAD-A42AA4 (External static pressure 35Pa) 208-230V 60Hz (External static pressure 100Pa) 208-230V 60Hz [0.281] [0.803] Limit Limit High [0.241] Middle High [0.602] [0.201] [0.161] Middle Rated point Rated point [0.401] [0.120] [0.080] [0.201] [0.040] [530] [706] [883] [1059] [1236] [1412] [1589] [530]...
  • Page 10 PEAD-A24, 30, 36,42AA4 Air filter 208-230V 60Hz [0.060] A36,42 [0.040] A24,30 [0.020] [353] [706] [1059] [1412] Airflow rate (m /min)[cfm]...

  • Page 11: Sound Pressure Levels

    SOUND PRESSURE LEVELS 5-1. Sound pressure level Ceiling concealed Aux. duct test unit Measurement location 5-2. NC curves PEAD-A24AA4 External static pressure 0.14 [in.WG] (35Pa) External static pressure 0.40 [in.WG] (100Pa) 70.0 70.0 High High Middle Middle 65.0 65.0 60.0 60.0...
  • Page 12 PEAD-A30AA4 External static pressure 0.14 [in.WG] (35Pa) External static pressure 0.40 [in.WG] (100Pa) 70.0 70.0 High High Middle Middle 65.0 65.0 60.0 60.0 NC-60 NC-60 55.0 55.0 50.0 50.0 NC-50 NC-50 45.0 45.0 40.0 40.0 NC-40 NC-40 35.0 35.0 30.0 30.0 NC-30 NC-30...
  • Page 13 PEAD-A36AA4 External static pressure 0.14 [in.WG] (35Pa) External static pressure 0.40 [in.WG] (100Pa) 70.0 70.0 High High Middle Middle 65.0 65.0 60.0 60.0 NC-60 NC-60 55.0 55.0 50.0 50.0 NC-50 NC-50 45.0 45.0 40.0 40.0 NC-40 NC-40 35.0 35.0 30.0 30.0 NC-30 NC-30...
  • Page 14 PEAD-A42AA4 External static pressure 0.14 [in.WG] (35Pa) External static pressure 0.40 [in.WG] (100Pa) 70.0 70.0 High High Middle Middle 65.0 65.0 60.0 60.0 NC-60 NC-60 55.0 55.0 50.0 50.0 NC-50 NC-50 45.0 45.0 40.0 40.0 NC-40 NC-40 35.0 35.0 30.0 30.0 NC-30 NC-30...

  • Page 15: Outlines & Dimensions

    OUTLINES & DIMENSIONS INDOOR UNIT PEAD-A24, 30, 36, 42AA4 NOTE 1. Use M10 screw for the Suspension bolt (field supply). 2. Keep the service space for the maintenance at the bottom. 3. This chart indicates for PEAD-A24·30·36·42AA4 models,which have 2 fans. 4.

  • Page 16: Wiring Diagram

    WIRING DIAGRAM PEAD-A24, 30, 36, 42AA4 TB15 INSIDE SECTION OF CONTROL BOX TRANSMISSION WIRES DC12V R.B. I.B. TO OUTDOOR UNIT CN30 CN105 CN32 CN3C P.B. (GREEN) (RED) (BLUE) CN41 (RED) CN2A LED2 (BLACK) CN90 CN51 CN22 (BLUE) LED1 (BLUE) CNXB2 (BLUE) LED3 CNXA2...

  • Page 17: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PEAD-A24, 30, 36, 42AA4 Strainer (#50) Heat exchanger Refrigerant GAS pipe connection (Flare) Thermistor TH5 (Cond./ Eva.temperature) Refrigerant flow in cooling Refrigerant flow in heating Refrigerant LIQUID pipe connection (Flare) Thermistor TH2 Pipe temperature(Liquid) Thermistor TH1 (Room temperature) Strainer (#50) Distributor with strainer (#50)

  • Page 18: Fan Control

    9-2. FAN CONTROL By setting the Mode No. 23 in the Function Table in section 9-1 to 2 and using CN4Y on the optional parts PAC-YU25HT, the following patterns of fan control will become possible when [DEFROST] or [ERROR] is displayed. Fan control patterns when [DEFROST] or [ERROR] is displayed Heater is installed in the duct.
  • Page 19 (3) Locally procured wiring A basic connection method is shown below. Indoor unit Remote control board Relay circuit control board Adapter CN24 White CN4Y White Electric Heater or panel heater (applicable only when a panel heater is connected) Preparations in the field Maximum cable length is 10 m (32ft) For relay X use the specifications given below Operation coil...

  • Page 20: Troubleshooting

    TROUBLESHOOTING 10-1. 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 21 10-2. 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 22: 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 23 Note: Refer to the manual of outdoor unit for the details of display 10-3. 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 24 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 25 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) For characteristics, refer to (P1) above. characteristics 2 Check contact failure of connector (CN44) 1 The unit is in three-minute resume pro- 2 Contact failure of connector on the indoor controller board.
  • Page 26 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 27 10-4. 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 28 10-5. TEST POINT DIAGRAM 10-5-1. Power supply board PEAD-A24AA4 PEAD-A30AA4 PEAD-A36AA4 PEAD-A42AA4 Power supply voltage (208 - 230VAC) CNMF Fan motor output 1 - 4: 310 - 340 VDC 5 - 4: 15 VDC 6 - 4: 0 - 6.5 VDC 7 - 4: Stop 0 or 15 VDC Run 7.5 VDC...
  • Page 29 10-5-2. Indoor controller board PEAD-A24AA4 PEAD-A30AA4 PEAD-A36AA4 PEAD-A42AA4 CN105 CN22 Emergency operation Model selection CNXA2 Capacity setting CN105 Radio frequency interface CNXC2 CN32 Remote start/stop adapter CNXB2 CN22 For MA remote controller cable con- CN41 nection CN24 (10 - 13 VDC (Between 1 and 3.))

  • Page 30: Trouble Criterion Of Main Parts

    10-6. TROUBLE CRITERION OF MAIN PARTS PEAD-A24AA4 PEAD-A30AA4 PEAD-A36AA4 PEAD-A42AA4 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 4.3kΩ~9.6kΩ Opened or short-circuited...
  • Page 31 10-8. 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. · 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 32 Setting by the dip switch and jumper wire Remarks Functions For service board Model settings MODELS Service board 1 2 3 4 5 PEAD-A24AA4 1 2 3 4 5 PEAD-A30AA4 Capacity settings 1 2 3 4 5 PEAD-A36AA4 1 2 3 4 5 PEAD-A42AA4 <Settings at time of factory shipment>...

  • Page 33: Disassembly Procedure

    DISASSEMBLY PROCEDURE Exercise caution when removing heavy parts. PEAD-A24AA4 PEAD-A30AA4 PEAD-A36AA4 PEAD-A42AA4 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 34 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 35 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. Fig.
  • Page 36 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 37 Exercise caution when removing heavy parts. 6. Heat exchanger 1. Remove the drain pan according to the proce- dure in section [3]. 2. Remove the heat exchanger cover according to the procedure in section [4] 2. 3. Removing the cover (1) Remove the five fixing screws on the cover (K) to remove it.
  • Page 40 New publication, effective Dec. 2010. HWE0905A Specifications subject to change without notice. Printed in Japan...

This manual is also suitable for:

Pead-a30aa4Pead-a36aa4Pead-a42aa4

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