Mitsubishi Electric PEAD Series Service Manual
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Mitsubishi Electric PEAD Series Service Manual

Mitsubishi Electric PEAD Series Service Manual

Split-type, heat pump air conditioners
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2024
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE MANUAL
Series PEAD
Model name
<Indoor unit>
PEAD-AA09NL
PEAD-AA12NL
PEAD-AA15NL
PEAD-AA18NL
PEAD-AA24NL
PEAD-AA30NL
PEAD-AA36NL
PEAD-AA42NL
INDOOR UNIT

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  • Page 1 2024 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SERVICE MANUAL Series PEAD Model name <Indoor unit> PEAD-AA09NL PEAD-AA12NL PEAD-AA15NL PEAD-AA18NL PEAD-AA24NL PEAD-AA30NL PEAD-AA36NL PEAD-AA42NL INDOOR UNIT...

  • Page 2: Table Of Contents

    CONTENTS 1. SAFETY PRECAUTION ··········································································· 3 2. PART NAMES AND FUNCTIONS ······························································ 8 3. SPECIFICATION ···················································································· 9 4. FAN PERFORMANCE AND CORRECTED AIR FLOW ·································13 5. SOUND PRESSURE LEVELS ·································································21 6. OUTLINES & DIMENSIONS ····································································28 7. WIRING DIAGRAM ················································································30 8. REFRIGERANT SYSTEM DIAGRAM ························································31 9.

  • Page 3: Safety Precaution

    SAFETY PRECAUTION 1. SAFETY PRECAUTION MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT Refrigerant This unit uses flammable refrigerant. Safety Group WARNING If refrigerant leaks and comes in contact with fire or heating part, it will create (Risk of fire) harmful gas and there is risk of fire. Read the OPERATION MANUAL carefully before operation.
  • Page 4 SAFETY PRECAUTION <1> Warning for service (1) Do not alter the unit. (2) For installation and relocation work, follow the instructions in the Installation Manual and use tools and pipe components specifically made for use with refrigerant specified in the outdoor unit installation manual. (3) Ask a dealer or an authorized technician to install, relocate and repair the unit.

  • Page 5: Additional Refrigerant Charge

    SAFETY PRECAUTION <3> Additional refrigerant charge When charging directly from cylinder • Check that cylinder for R454B on the market is syphon type. • Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.) <4>...
  • Page 6 SAFETY PRECAUTION (5) Detection of flammable refrigerants Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall not be used. The following leak detection methods are deemed acceptable for all refrigerant systems.

  • Page 7: Service Tools

    Failure to install and maintain such temperature control mechanism may void the warranty for this unit. • Mitsubishi Electric shall not bear any warranty obligation or other liability for any damage or loss in connection with such third party auxiliary heaters.

  • Page 8: Part Names And Functions

    PART NAMES AND FUNCTIONS 2. PART NAMES AND FUNCTIONS • Indoor Unit Air intake (sucks the air inside the room into the unit) Air outlet In case of bottom inlet In case of rear inlet HWE24030...

  • Page 9: Specification

    SPECIFICATION 3. SPECIFICATION Service Ref. PEAD-AA09NL-U1 Power supply (phase, cycle, voltage) 1 phase, 60Hz, 208/230V Max. Fuse Size Min. Circuit Ampacity 2.13 External finish Galvanized sheets Heat exchanger Plate fin coil Fan (drive) × No. Sirocco fan × 2 Fan motor output 0.121 Fan motor F.L.A...
  • Page 10 SPECIFICATION Service Ref. PEAD-AA15NL-U1 Power supply (phase, cycle, voltage) 1 phase, 60Hz, 208/230V Max. Fuse Size Min. Circuit Ampacity 2.25 External finish Galvanized sheets Heat exchanger Plate fin coil Fan (drive) × No. Sirocco fan × 2 Fan motor output 0.121 Fan motor F.L.A...
  • Page 11 SPECIFICATION Service Ref. PEAD-AA24NL-U1 Power supply (phase, cycle, voltage) 1 phase, 60Hz, 208/230V Max. Fuse Size Min. Circuit Ampacity 2.25 External finish Galvanized sheets Heat exchanger Plate fin coil Fan (drive) × No. Sirocco fan × 2 Fan motor output 0.121 Fan motor F.L.A...
  • Page 12 SPECIFICATION Service Ref. PEAD-AA36NL-U1 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 × 3 Fan motor output 0.300 Fan motor F.L.A...

  • Page 13: Fan Performance And Corrected Air Flow

    FAN PERFORMANCE AND CORRECTED AIR FLOW 4. FAN PERFORMANCE AND CORRECTED AIR FLOW PEAD-AA09NL PEAD-AA09NL (External static pressure 35Pa) 208-230V 60Hz (External static pressure 100Pa) 208-230V 60Hz [0.16] [0.44] [0.40] [0.36] Limit [0.12] Limit [0.32] High [0.28] High Middle1 [0.24] [0.08] Middle1 Middle2...
  • Page 14 FAN PERFORMANCE AND CORRECTED AIR FLOW PEAD-AA12NL PEAD-AA12NL (External static pressure 35Pa) 208-230V 60Hz (External static pressure 100Pa) 208-230V 60Hz [0.24] [0.48] [0.44] [0.20] [0.40] High Limit [0.36] [0.16] [0.32] Limit Middle1 [0.28] High Middle2 [0.12] [0.24] Middle1 [0.20] Limit Middle2 [0.08] [0.16]...
  • Page 15 FAN PERFORMANCE AND CORRECTED AIR FLOW PEAD-AA15, 18NL PEAD-AA15, 18NL (External static pressure 35Pa) 208-230V 60Hz (External static pressure 100Pa) 208-230V 60Hz [0.48] [0.44] [0.20] [0.40] High Limit [0.36] Limit [0.16] [0.32] Middle1 High [0.28] [0.12] [0.24] Middle1 Middle2 Limit [0.20] [0.08] [0.16]...
  • Page 16 FAN PERFORMANCE AND CORRECTED AIR FLOW PEAD-AA24NL PEAD-AA24NL (External static pressure 35Pa) 208-230V 60Hz (External static pressure 100Pa) 208-230V 60Hz [0.48] [0.44] [0.20] High [0.40] Limit Limit [0.36] [0.16] [0.32] Middle1 [0.28] [0.12] Middle2 [0.24] High [0.20] Middle1 [0.08] [0.16] Middle2 Limit [0.12]...
  • Page 17 FAN PERFORMANCE AND CORRECTED AIR FLOW PEAD-AA30NL PEAD-AA30NL (External static pressure 35Pa) 208-230V 60Hz (External static pressure 100Pa) 208-230V 60Hz [0.52] [0.28] High [0.48] [0.44] [0.24] [0.40] Limit Limit [0.20] [0.36] High Middle1 [0.32] [0.16] [0.28] Middle2 Middle1 [0.24] [0.12] Middle2 [0.20] Limit...
  • Page 18 FAN PERFORMANCE AND CORRECTED AIR FLOW PEAD-AA36NL PEAD-AA36NL (External static pressure 35Pa) 208-230V 60Hz (External static pressure 100Pa) 208-230V 60Hz [0.36] [0.60] [0.32] [0.28] Limit Limit High [0.24] [0.40] High Middle1 [0.20] Middle2 Middle1 [0.16] Middle2 [0.12] [0.20] [0.08] Limit [0.04] [530] [706]...
  • Page 19 FAN PERFORMANCE AND CORRECTED AIR FLOW PEAD-AA42NL PEAD-AA42NL (External static pressure 35Pa) 208-230V 60Hz (External static pressure 100Pa) 208-230V 60Hz [0.48] [0.44] High [0.40] [0.60] [0.36] High Limit Limit [0.32] Middle1 [0.28] [0.40] Middle1 Middle2 [0.24] Middle2 [0.20] [0.16] Limit [0.20] [0.12] [0.08]...
  • Page 20 FAN PERFORMANCE AND CORRECTED AIR FLOW PEAD-AA09, 12, 15, 18, 24, 30, 36, 42NL Air filter 208-230V 60Hz [0.06] AA36, 42NL [0.04] AA24, 30NL AA09, 12, 15, 18NL [0.02] [353] [706] [1059] [1412] Airflow rate(m /min)[cfm] HWE24030...

  • Page 21: Sound Pressure Levels

    SOUND PRESSURE LEVELS 5. SOUND PRESSURE LEVELS 5-1. Sound pressure level Ceiling concealed Aux. duct test unit Measurement location 5-2. NC curves PEAD-AA09NL External static pressure 0.14 [in.WG] (35Pa) External static pressure 0.40 [in.WG] (100Pa) 70.0 70.0 High 60Hz High 60Hz Middle1 60Hz...
  • Page 22 SOUND PRESSURE LEVELS PEAD-AA12NL External static pressure 0.14 [in.WG] (35Pa) External static pressure 0.40 [in.WG] (100Pa) 70.0 70.0 High High 60Hz 60Hz Middle1 60Hz Middle1 60Hz 65.0 65.0 Middle2 Middle2 60Hz 60Hz 60Hz 60Hz 60.0 60.0 NC-60 NC-60 55.0 55.0 50.0 50.0 NC-50...
  • Page 23 SOUND PRESSURE LEVELS PEAD-AA15, 18NL External static pressure 0.14 [in.WG] (35Pa) External static pressure 0.40 [in.WG] (100Pa) 70.0 70.0 High High 60Hz 60Hz Middle1 60Hz Middle1 60Hz 65.0 65.0 Middle2 Middle2 60Hz 60Hz 60Hz 60Hz 60.0 60.0 NC-60 NC-60 55.0 55.0 50.0 50.0...
  • Page 24 SOUND PRESSURE LEVELS PEAD-AA24NL External static pressure 0.14 [in.WG] (35Pa) External static pressure 0.40 [in.WG] (100Pa) 70.0 70.0 High High 60Hz 60Hz Middle1 60Hz Middle1 60Hz 65.0 65.0 Middle2 Middle2 60Hz 60Hz 60Hz 60Hz 60.0 60.0 NC-60 NC-60 55.0 55.0 50.0 50.0 NC-50...
  • Page 25 SOUND PRESSURE LEVELS PEAD-AA30NL External static pressure 0.14 [in.WG] (35Pa) External static pressure 0.40 [in.WG] (100Pa) 70.0 70.0 High High 60Hz 60Hz Middle1 60Hz Middle1 60Hz 65.0 65.0 Middle2 Middle2 60Hz 60Hz 60Hz 60Hz 60.0 60.0 NC-60 NC-60 55.0 55.0 50.0 50.0 NC-50...
  • Page 26 SOUND PRESSURE LEVELS PEAD-AA36NL External static pressure 0.14 [in.WG] (35Pa) External static pressure 0.40 [in.WG] (100Pa) 70.0 70.0 High High 60Hz 60Hz Middle1 Middle1 60Hz 60Hz 65.0 65.0 Middle2 60Hz Middle2 60Hz 60Hz 60Hz 60.0 60.0 NC-60 NC-60 55.0 55.0 50.0 50.0 NC-50...
  • Page 27 SOUND PRESSURE LEVELS PEAD-AA42NL External static pressure 0.14 [in.WG] (35Pa) External static pressure 0.40 [in.WG] (100Pa) 70.0 70.0 High 60Hz High 60Hz Middle1 Middle1 60Hz 60Hz 65.0 65.0 Middle2 Middle2 60Hz 60Hz 60Hz 60Hz 60.0 60.0 NC-60 NC-60 55.0 55.0 50.0 50.0 NC-50...

  • Page 28: Outlines & Dimensions

    OUTLINES & DIMENSIONS 6. OUTLINES & DIMENSIONS INDOOR UNIT PEAD-AA09, 12, 15, 18, 24, 30, 36, 42NL HWE24030...
  • Page 29 OUTLINES & DIMENSIONS HWE24030...

  • Page 30: Wiring Diagram

    WIRING DIAGRAM 7. WIRING DIAGRAM PEAD-AA09, 12, 15, 18, 24, 30, 36, 42NL HWE24030...

  • Page 31: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM 8. REFRIGERANT SYSTEM DIAGRAM PEAD-AA09, 12, 15, 18, 24, 30, 36, 42NL 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)

  • Page 32: Heater Control

    Failure to install and maintain such temperature control mechanism may void the warranty for this unit. • Mitsubishi Electric shall not bear any warranty obligation or other liability for any damage or loss in connection with such third party auxiliary heaters.
  • Page 33 HEATER CONTROL • Table 2 shows how the field-installed heater is controlled. Table. 2 [Heater Control Table] Mode Condition Change T RA has not (To -T RA ) > increased by EH1 ON 2.7 ° F [1.5 °C] 0.9 °F [0.5°C] in X min T RA has not (To -T RA ) >...
  • Page 34 HEATER CONTROL • Chart 1 and Table 4 show an example of heater operation. Chart 1 [Heater Operation Example] T  - 0.9 °F [0.5 °C] T - 2.7 °F [1.5 °C] > 8 X min X min X min Table. 4 [Heater Operation Example] Step Condition Result...
  • Page 35 HEATER CONTROL 9-3. FAN CONTROLL By setting the Mode No. 11 in the Function Table in section 9-2 and using panel heater connector 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 36 HEATER CONTROL (3) Locally procured wiring ♦A basic connection method is shown below. Indoor unit Remote control board Relay circuit control board Adapter CN24/CN24A (1st) (2nd) White CN2Y 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)

  • Page 37: Humidifier Control

    HUMIDIFIER CONTROL 10. HUMIDIFIER CONTROL 10-1. Control Specifications The below table shows how the field installed humidifier and fan speed is controlled. Mode (function) No. Humidistat Wired remote controller output Condition (no defrost/no error) CN25 output Fan speed (RF thermostat) 13 (113) 16 (116) CNF input...

  • Page 38: Erv (Energy Recovery Ventilation) Control

    ERV (ENERGY RECOVERY VENTILATION) CONTROL 11. ERV (ENERGY RECOVERY VENTILATION) CONTROL 11-1. Control Specifications The below table show how the field installed ERV is controlled. ERV output Function CN2C output Condition Fan speed Mode26 (=Fan output) CNER input Cool/Heat/Fan operation RC setting Defrost STOP...

  • Page 39: Troubleshooting

    TROUBLESHOOTING 12. TROUBLESHOOTING 12-1. CAUTIONS ON TROUBLESHOOTING (1) Before troubleshooting, check the followings: Check the power supply voltage. Check the indoor/outdoor connecting wire for mis-wiring. (2) Take care the followings during servicing. 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 40 TROUBLESHOOTING 12-2. 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 IR wireless remote Wired remote controller controller RF thermostat Symptom Remark Beeper sounds/OPERATION...
  • Page 41 TROUBLESHOOTING • If the unit cannot be operated properly after the test run has been performed, refer to the following table to remove the cause. Symptom Cause Wired remote controller LED 1, 2 (PCB in outdoor unit) For about 2 After LED 1, 2 are lighted, LED 2 is •...
  • Page 42 TROUBLESHOOTING 12-3. SELF-DIAGNOSIS ACTION TABLE Note: Refer to the manual of outdoor unit for the details of display such as F, U, and other E. Error Code Abnormal point and detection method Cause Countermeasure Room temperature thermistor (TH1) 1. Defective thermistor 1–...
  • Page 43 TROUBLESHOOTING Error Code Abnormal point and detection method Cause Countermeasure Freezing/overheating protection is (Cooling or drying mode) (Cooling or drying mode) working 1. Clogged filter (reduced airflow) 1. Check clogging of the filter. 1. Freezing protection (Cooling mode) 2. Short cycle of air path 2.
  • Page 44 TROUBLESHOOTING Error Code Abnormal point and detection method Cause Countermeasure Abnormality of pipe temperature 1. Defective thermistor 1–3. Check resistance value of thermistor. thermistor / Condenser-Evaporator characteristics For characteristics, refer to (P1) above. (TH5) 2. Contact failure of connector 2. Check contact failure of connector (CN44) 1.
  • Page 45 TROUBLESHOOTING Error Code Abnormal point and detection method Cause Countermeasure Indoor/outdoor unit communication 1. Contact failure, short circuit or, * Check LED display on the outdoor control error (Signal receiving error) mis-wiring (converse wiring) of circuit board. (Connect A-control service tool, 1.
  • Page 46 TROUBLESHOOTING Error Code Abnormal point and detection method Cause Countermeasure Water leakage 1. Mis-piping of extension pipes 1. Check the extension pipes for mis-piping. This detection is performed during the (When connected with multiple operation (stop, heating, fan, or error stop units) mode etc.) other than cooling and dry.
  • Page 47 TROUBLESHOOTING 12-4. 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 is • When LED1 on indoor controller board is also off. off.
  • Page 48 TROUBLESHOOTING 12-5. TEST POINT DIAGRAM 12-5-1. Indoor controller board SW1 SW2 Power supply voltage CN24 CN25 CN105 (208V – 230VAC) CN51 CNMF Fan motor output CN32 1-4 : 294-325VDC CN4F 5-4 : 15VDC 6-4 : 0-6.5VDC CN2L CN90 7-4 : STOP 0 or 15VDC CN2C LED2 Run 7.5VDC...
  • Page 49 TROUBLESHOOTING 12-6. TROUBLE CRITERION OF MAIN PARTS 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 4.3 kΩ~9.6 kΩ Opened or short-circuited thermistor/liquid (TH2) Condenser/evaporator...
  • Page 50 TROUBLESHOOTING 12-7. Thermistor <Thermistor Characteristic graph> < Thermistor for lower temperature > Room temperature thermistor (TH1) Thermistor for Pipe temperature thermistor (TH2) lower temperature Condenser/evaporator temperature thermistor (TH5) Thermistor R =15kΩ ± 3% Fixed number of B=3480kΩ ± 2% – Rt=15exp { 3480( 273+t 0°C...
  • Page 51 TROUBLESHOOTING 12-9. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE Each function is controlled by the dip switch and the jumper wire on control p.c. board. SW1 and SW2 are equipped only for service parts. Model setting and capacity setting are memorized in the nonvolatile memory of the control p.c. board of the unit. (Marks in the table below) Jumper wire ( ○: Short ×: Open) Jumper wire...

  • Page 52: Disassembly Procedure

    DISASSEMBLY PROCEDURE 13. DISASSEMBLY PROCEDURE Exercise caution when removing heavy parts. 1. Control box 1. Removing the control box cover (1) Remove the three fixing screws on the cover (A) to remove it. • Tighten screws to a torque of 2.0±0.2 N·m. Fig.

  • Page 53: Drain Pump

    DISASSEMBLY PROCEDURE Exercise caution when removing heavy parts. 3. Drain pump 1. Remove the control box cover according to the procedure in section 1. 2. Remove the drain pump. (1) Remove the drain pump from connector (E) in control box. (2) Remove the cover (D) and the drain pump.
  • Page 54 DISASSEMBLY PROCEDURE Exercise caution when removing heavy parts. 6. Thermistor (Condenser/evaporator) (Liquid pipe) 1. Remove the drain pan according to the procedure in section 5. 2. Removing the Heat exchanger cover (1) Remove the three fixing screws on the heat exchanger cover (J) to remove it.

  • Page 55: Fan And Fan Motor

    DISASSEMBLY PROCEDURE Exercise caution when removing heavy parts. 7. 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 (M) to remove it.

  • Page 56: Heat Exchanger

    DISASSEMBLY PROCEDURE Exercise caution when removing heavy parts. 8. Heat exchanger 1. Remove the drain pan according to the procedure in section 5. 2. Remove the heat exchanger cover according to the procedure in section 6.2. 3. Removing the cover (1) Remove the five fixing screws on the cover (Q) to remove it.

  • Page 57: Inspection And Maintenance

    INSPECTION AND MAINTENANCE 14. INSPECTION AND MAINTENANCE 14-1. GUIDELINE FOR PREVENTIVE MAINTENANCE The following maintenance intervals indicate the estimated intervals of parts replacement and repair to be required as a result of periodic inspections. They do not necessarily mean that replacement is required at the maintenance intervals. The maintenance intervals do not indicate the warranty period.
  • Page 58 INSPECTION AND MAINTENANCE 14-2. RECOMMENDED PARTS INSPECTION INTERVAL Inspection Maintenance Parts Inspection items Criteria Measures interval interval • Visual check for dirt or • Filter element is seen • Clean the filter if it is Long-life torn. through. dirty. 5 years filter •...
  • Page 59 INSPECTION AND MAINTENANCE • The table above shows the main parts. Check the maintenance contract for details. • This maintenance interval is an estimated period until the day when the maintenance should be conducted to use the product safely for a long time. Make use of the table above for maintenance planning (such as planning budget for parts replacement cost).
  • Page 60 www.MitsubishiElectric.com New publication effective Sep. 2024 Specifications subject to change without notice HWE24030...

This manual is also suitable for:

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