Mitsubishi Electric PAA-A18AA1 Service Manual
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Mitsubishi Electric PAA-A18AA1 Service Manual

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MANUFACTURED FOR:
MITSUBISHI ELECTRIC US, INC.
Air Conditioners
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
SERVICE MANUAL

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Summary of Contents for Mitsubishi Electric PAA-A18AA1

  • Page 1 MANUFACTURED FOR: MITSUBISHI ELECTRIC US, INC. Air Conditioners PAA-A18, 24, 30, 36, 42AA1/BA1/CA1 SERVICE MANUAL...

  • Page 2: Table Of Contents

    11.6. Trouble criterion of main parts ..................52 11.7. Thermistor ......................... 53 12. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE ............. 54 13. DISASSEMBLY PROCEDURE ....................55 Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 3: Safety Precautions

    Failure to follow these regulations may harm the environment and can lead to the imposition of substantial fines. NOTE The service of the unit is regulated by the mechanical code adopted by the authority having jurisdiction. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 4 In some cases, it can lead to death. Properly support the PAA unit in these situations. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 5 • Do not reconstruct or change the settings of the protection devices. – If the pressure switch, thermal switch, float switch or other protection devices are shorted and operated forcibly, or parts other than those specified by Mitsubishi Electric are used, fire or explosion may result.
  • Page 6 A-Coil section resulting in refrigerant and oil leaks. Furthermore, poisoning, fire, and explosions may occur from this, doing so can cause bodily harm and damage to property. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 7 • Never substitute parts or components from other manufacturers when repairing or replacing components in the PAA unit. Never service or operate the PAA unit if any parts or components are damaged. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 8 Standard or Guideline (Code)], or due to aging deterioration or the influence of the usage environment, there is a risk of poisoning symptoms due to combustion gas or igniting fuel gas and causing a fire or explosion. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 9 Service guidelines • For PAA unit piping connections, use flare connection as the equipment was designed for. Mitsubishi Electric US, Inc. is not responsible for improper brazing connection done by the service technician. – For pipe flaring, use an R410A flaring tool.

  • Page 10: Devices That Use R410A Refrigerant

    • Use liquid refrigerant to fill the system. – If gas refrigerant is used to seal the system, the composition of the refrigerant in the cylinder will change and performance may drop. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 11: Before Getting Started

    ✓ PUY-A36NKA7 ✓ PUY-A42NKA7 PUZ-A18NKA7 No connection allowed ✓ ✓ PUZ-A24NHA7 ✓ PUZ-A30NHA7 ✓ PUZ-A36NKA7 ✓ PUZ-A42NKA7 ✓ PUZ-HA24NHA1 ✓ PUZ-HA30NKA ✓ PUZ-HA36NKA PUZ-HA42NKA1 No connection allowed Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 12 3 or more Connected Connected Indoor Capacity (kBtu/h) <27 492 ft 492 ft (N/A, (N/A, MXZ-SM36/48NAM (150 m) (150 m) *above 27 *above 27 MXZ- kBtu/h) kBtu/h) SM36/42/48NAMHZ Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 13 A42BA1 PAA- PAA- PAA- PAA- PAA- A18BA1 A24BA1 A30BA1 A36CA1 A42CA1 Airflow 23.0 23.5 29.0 34.0 47.0 Maximum 1024 1201 1660 12.0 15.6 19.8 22.7 26.5 Minimum Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 14 The above airflow restriction is limited to the heat pump operation only. WARNING • Ensure the gas furnace complies with ANSI-Z21.47/CSA2.3 standards by NRTL 3rd party lab such as AGA, CSA, UL, or ETL/Intertek. Mitsubishi Electric US, Inc. air conditioner/heat pump system must only be connected with ANSI-Z21.47/CSA2.3 certificated gas furnace.
  • Page 15 • Failure to follow this warning could result in property damage, severe personal injury, or death: verify the furnace is properly installed according to the gas furnace service manual and local building codes. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 16: Before Servicing Or Moving The Paa Unit - Electrical Work

    PAA-A18, 24, 30, 36, 42AA1/BA1/CA1 1.4. Before servicing or moving the PAA unit - electrical work NOTE Ensure the wiring is not pinched or damaged when fitting the control box cover. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 17 – Failure to disconnect power may result in electric shock or injury. • Label all wires prior to disconnection when servicing controls. Verify proper operation after servicing. – Wiring errors can cause improper and dangerous operation. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 18: Before Starting The Test Run

    Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 19: To Dispose Of The Paa Unit

    1.6. To dispose of the PAA unit CAUTION To dispose of the PAA unit, consult a dealer, contractor, or technician with certifications required by laws and codes. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 20: Installation Positions And Corresponding Airflow Direction

    2. INSTALLATION POSITIONS AND CORRESPONDING AIRFLOW DIRECTION Indoor Unit Vertical Air Outlet Horizontal Right Air Outlet Air Inlet Air Inlet Downflow Air Inlet Horizontal Left Air Inlet Air Outlet Air Outlet Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 21: Specifications

    PAA units should be serviced by a dealer, contractor, or technician with proper certifications as required by laws and codes. For outdoor units to be connected, refer to the installation manual that comes with the units. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 22: Internal Pressure Drop

    Airflow rate (CFM) PAA-A24BA1 Vertical, Downflow Horizontal Right, Horizontal Left PAA-A24BA1 PAA-A24BA1 0.200 0.250 0.200 0.150 0.150 0.100 0.100 0.050 0.050 0.000 0.000 Airflow rate (CFM) Airflow rate (CFM) Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 23 0.350 0.300 0.300 0.250 0.250 0.200 0.200 0.150 0.150 0.100 0.100 0.050 0.050 0.000 0.000 1000 1100 1200 1000 1100 1200 Airflow rate (CFM) Airflow rate (CFM) Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 24 0.300 0.200 0.200 0.100 0.100 0.000 0.000 1050 1150 1250 1350 1450 1550 1650 1050 1150 1250 1350 1450 1550 1650 Airflow rate (CFM) Airflow rate (CFM) Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 25: Outlines And Dimensions

    PAA-A18, 24, 30, 36, 42AA1/BA1/CA1 5. OUTLINES AND DIMENSIONS Cabinet Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 26 409.6 785.2 (17-1/2) (15-5/16) (16-1/8) (31) (21-3/8) PAA-A36CA1 534.6 479.4 785.2 (21) (18-7/8) (19-5/8) (31) (21-3/8) PAA-A42CA1 534.6 479.4 785.2 (21) (18-7/8) (19-5/8) (31) (21-3/8) Control Box Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 27 Ensure the hole is completely sealed after cleaning. The sealing material used must be able to withstand a minimum temperature of 350° F. Designated area to cut hole for inspection 165 mm Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 28: Wiring Diagram

    CN32 ON/OFF Lockout Input CN51 Error Status Output W/W1 First Stage Furnace Secondary Stage Furnace Y/Y2 High Speed Fan 24VAC Power From Furnace 24VAC Return To Furnace Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 29 2 3 4 2 3 4 2 3 4 2 3 4 2 3 4 2 3 4 2 3 4 2 3 4 42,000 BTU PAA-A42CA1 Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 30: Refrigerant System Diagram

    Refrigerant flow in cooling Refrigerant flow in heating Thermistor TH2 Pipe temperature(Liquid) Refrigerant LIQUID pipe connection (Flare) Thermistor TH1 (Return Air temperature) Strainer (#50) Distributor with strainer (#50) Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 31: Test Mode And Emergency Mode

    (b) there is an error state that does not allow full system control. The PAA unit remains in emergency mode until power is restored to the outdoor unit or the error is resolved. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 32 If DIP switch SW01-4 is set to OFF, the NAT connected to the PAA unit control box controls the heat applied to the furnace during an emergency mode failover. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 33 Test • OFF (default): mode. Emergency mode operation, which is controlled by the NAT. NOTE To enable W2, W1 must be ON. Otherwise, W2 will not operate. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 34 (indicator color: amber). Test mode push button (not illuminated, button color: white). IMPORTANT Be sure to change back to Normal mode operation after Test mode operational checks are completed! Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 35 To enable both W1 and W2 to come on when the emergency thermostat calls for heat, connect the W1 and W2 together to one side of the NAT and R to its other side. Non-adjustable (emergency) thermostat connection Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 36: Humidifier Control Specifications

    CN105, regardless of mode or settings) Humidifier supported See Mode 16 table below. (applies if Mode no. See Mode 16 table below. 13 Setting no. = 2) Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 37 • Humidifier output will only run when in heating mode. • Mode 25 set to 1 = furnace fan on, when thermo OFF. Mode 25 set to 2 = furnace fan off, when thermo OFF. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 38: Installation

    Heat operation & Thermo ON Except for heat operation RC setting RC: Remote controller The fan continues to run for 30 seconds after the humidifier stops. *Factory Setting Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 39: Erv (Energy Recovery Ventilation) Control

    It is recommended to set Modes 25 and 27 to 2, in order to have the indoor fan stop running when set temperature is met. Otherwise, CN2C will energize the ERV 24/7. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 40: Installation

    CN2C output Condition Fan speed CNER input (=Fan output) Cool/Heat/Fan operation RC setting Defrost STOP STOP STOP Cool/Heat/Fan operation RC setting Defrost STOP STOP STOP RC: Remote controller Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 41: Troubleshooting

    3. When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires. Lead wires Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 42: Self-Check Function, Function Table

    The auto restart function works after power is restored after a power failure. The unit will restart automatically approximately 4 minutes after power is restored. Set the AUTO RESTART FUNCTION using the wireless remote controller. (Mode no.1). Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 43 PAA Installation Manual (High fan speed only) Single fan speed 2-speed fan option Supports LOW and HIGH speeds. Dual fan speed PUZ/PUY AUTO mode also supported Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 44: Self-Diagnosis Action Table

    (3 and 4 of connector CN4F is not short-circuited.) board Operate with connector (CN4F) short- Constantly detected during operation. circuited. Refer Test Point Diagram. Re- place indoor controller board if abnormality reappears. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 45 • Fan motor is defective. • Indoor controller board is defective. Defective outdoor fan con- trol Overcharge of refrigerant Defective refrigerant circuit (clogs) Bypass circuit of outdoor unit is defective Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 46 5. When no problems are found in 1–4 above, replace the indoor unit control board. Defective indoor controller board Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 47 ∗ Other indoor controller board may have defect in case of twin triple indoor unit system. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 48 (Error code: E1) (6833) Abnormal if the clock function of remote controller cannot be operated normally. (Error code: E2) Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 49: Troubleshooting By Inferior Phenomena

    Short-cut of remote controller wires. remote controller is defective; if LED 2 is lit, connection failure of remote controller Defective remote controller. terminal block etc. has returned to normal. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 50: Test Point Diagram

    CNXA1: Connect to the indoor controller board CNXB1: Connect to the indoor controller board CNXC1: Connect to the indoor controller board CNXB1 CNXC1 CNXA1 (*1) PC51 (*1) (*1) Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 51: Indoor Controller Board

    CN51: Error Status Output CN41: JAMA standard HA terminal CN44: TH02 Pipe Temp. thermistor/Liquid; TH05 Cond./Evap Temp CN4F: Float sensor CN20: Thermistor (Inlet temperature) CN24-1: W/W1 (Heat) Command signal Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 52: Trouble Criterion Of Main Parts

    • Install PAC-USSEN00(1|2)FM-1 as the return air sensor, placed into the conditioned space. • Use kumo cloud in conjunction with the PAC-USWHS003TH-1 wireless temperature and humidity sensor. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 53: Thermistor

    Thermistor R 65.8 k" 0°C (32°F) 40.1 k" 10°C (50°F) 25.2 k" 20°C (68°F) 20.2 k" 25°C (77°F) 16.2 k" 30°C (86°F) 10.7 k" 40°C (104°F) (˚C) (˚F) Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 54: Functions Of Dip Switch And Jumper Wire

    X - No jumper Indoor There is a jumper on JP3. Indoor controller board type controller O - Jumper ⃝ Factory shipment board type ⃝ Service parts setting Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

  • Page 55: Disassembly Procedure

    FOR UPFLOW AND DOWNFLOW INSTALLATIONS: 1. THE TOP PLATE MUST BE REMOVED (AS SHOWN). 2. THE SIDE DRAIN PAN MUST BE REMOVED (AS SHOWN). REMOVE TOP PLATE REMOVE SIDE DRAIN PAN Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 56 Step 1: Remove pipe panel which is secured by 5 screws, as displayed below: Step 2: Remove front panel which is secured by 12 screws. (Screws not shown.) Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 57 Step 4: Remove the 2 side panels (side pipe panel assembly), which are hooked to the cabinet, by moving them in the directions indicated in the images below and removing them from the cabinet. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 58 /downflow installations. NOTE Side drain pan support must be removed while the heat exchanger is inside the cabinet. Some parts are not shown for clearer image. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 59 • Use extreme caution when removing the heat exchanger from the cabinet as the thermistor wires are attached to the assembly. – Damaging these wires may cause the unit to malfunction. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 60 • Removing the heat exchanger may cause the side drain pan to fall off the main drain pan. – Drain pan may fall and cause personal injury. A-Coil inverted to show how the 4 screws are removed. Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.
  • Page 61 Please be sure to put the contact address/telephone number on this manual before handing it to the customer. Manufactured for: MITSUBISHI ELECTRIC US, INC. www.mitsubishielectric-usa.com Toll Free: 800-433-4822 MEUS DOC# MD-2025-K005 Ver.1 September 2022 Specifications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc.

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