Mitsubishi Electric PAA-A18AA1 Installation Manual
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Mitsubishi Electric PAA-A18AA1 Installation Manual

Mitsubishi Electric PAA-A18AA1 Installation Manual

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MANUFACTURED BY:
MITSUBISHI ELECTRIC US, INC.
Air Conditioners
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
INSTALLATION MANUAL
FOR INSTALLER
For safe and correct use, please read this installation manual thoroughly before installing
this product.

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  • Page 1 MANUFACTURED BY: MITSUBISHI ELECTRIC US, INC. Air Conditioners PAA-A18, 24, 30, 36, 42AA1/BA1/CA1 INSTALLATION MANUAL FOR INSTALLER For safe and correct use, please read this installation manual thoroughly before installing this product.

  • Page 2: Table Of Contents

    15.8.2. Capacity balance point ..................65 15.8.3. Extended balance point ................... 65 15.9. Condensate overflow safety switch connection (CN4F) ..........65 15.10. Energy recovery ventilation (ERV) ................66 Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 3 16.1. Before test run ......................69 16.2. Perform test run ......................70 16.3. Complete self check ....................70 16.4. Auto restart function ....................71 17. Cut out gauge ........................72 Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 4: Warning

    • For proper airflow and system performance, FURNACE only install coils that match within 1” of the fur- nace width. • The PAA unit does not support supplemental electric heating systems. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 5 15. Top drain (for horizontal in- Horizontal installations stallation) NOTE Items 13 and 14 are for refer- ence only and are not provi- ded by Mitsubishi Electric US, Inc. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 6: Dimensions

    PAA-A18, 24, 30, 36, 42AA1/BA1/CA1 2.3. Dimensions Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 7 (32) PAA-A42BA1 445.0 409.6 811.6 (17-1/2) (15-5/16) (16-1/8) (32) PAA-A36CA1 534.6 479.4 811.6 (21) (18-7/8) (19-5/8) (32) PAA-A42CA1 534.6 479.4 811.6 (21) (18-7/8) (19-5/8) (32) Control Box Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 8: Inspect Shipment

    Describes precautions that should be observed to prevent danger of injury or death to the user. CAUTION Describes precautions that should be observed to prevent damage to the unit. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 9: Before Installation And Electric Work

    – If the unit is installed improperly, water leak- the “National Electrical Code" and local electri- age, electric shock, or fire may result. cal codes, “Interior Wire Regulations” and the Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 10 PAA-A18, 24, 30, 36, 42AA1/BA1/CA1 instructions provided in this installation manual, – The manufacturer, Mitsubishi Electric Corpo- and always use a dedicated breaker. ration, its affiliates and suppliers, cannot be held responsible for malfunctions or acci- – If the power source capacity is inadequate or...
  • Page 11 (AGA, UL, CSA, ETL/Intertek, etc.), or if the gas furnace does not comply with AC- CA (Air Conditioning Contractors Association) Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 12: Devices That Use R410A Refrigerant

    • For PAA unit piping connections, use flare con- CAUTION nection as the equipment was designed for. Mitsubishi Electric US, Inc. is not responsible Risks related to PAA unit installation for improper brazing connection done by the • When installing and relocating the PAA unit, do installer.
  • Page 13 – The vacuum pump oil may flow back into the refrigerant cycle and cause the refrigerant oil to deteriorate. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 14: Before Getting Started

    PUZ-A24NHA7 ✓ ✓ TRUZA0241HA70(N/B)A PUZ-A30NHA7 ✓ TRUZA0301HA70(N/B)A PUZ-A36NKA7 ✓ TRUZA0361KA70(N/B)A PUZ-A42NKA7 ✓ TRUZA0421KA70(N/B)A PUZ-HA24NHA1 ✓ TRUZH0241HA10NA PUZ-HA30NKA ✓ TRUZH0301KA00NA PUZ-HA36NKA ✓ TRUZH0361KA00NA PUZ-HA42NKA1 connection TRUZH0421KA10NA allowed Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 15 ✔ NTXMSM60A182AA/BA MXZ-3C24NAHZ3/4 ✔ NTXMPH24A132BA/CA MXZ-3C30NAHZ3/4 ✔ ✔ NTXMPH30A132BA/CA MXZ-SM36NAMHZ/2 ✔ ✔ ✔ ✔ NTXMSH36A142AA/BA MXZ-SM42NAMHZ/2 ✔ ✔ ✔ ✔ NTXMSH42A152AA/BA MXZ-SM48NAMHZ/2 ✔ ✔ ✔ ✔ NTXMSH48A182AA/BA Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 16 The above chart is for M-Series/Nv-Series. For P- Series, follow guidelines in the P-Series outdoor unit NOTE installation manual. For extended piping lengths, please refer to Diamond System Builder (DSB). Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 17 • Install the drain piping according to this instal- lation manual to ensure proper drainage. Wrap thermal insulation around the pipes to prevent condensation. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 18: Before Getting Paa Unit Installed (Moved) - Electrical Work

    – Tension may cause the cable to break and lation manual to ensure proper drainage. Wrap generate heat and cause a fire. • Install a leak circuit breaker as required. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 19: Before Starting The Test Run

    • Do not touch the switches with wet fingers. – Do not use any phone in your building. – Touching a switch with wet fingers can cause electric shock. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 20: After Installation And Test Run

    If for any reason your HVAC system should fail to operate, damage such as burst water pipes could result from lack of proper heating to the space. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 21: Indoor Unit Accessories

    Screws (M5) TH1 Thermistor Bracket L‑bracket (not in accessories bag), qty = 1 Zip ties Operation manual Troubleshooting guide Washers U‑bend covers (PAA-A36 and PAA-A42 models on- Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 22: Selecting An Installation Site

    8.1. Installation clearance TOP View TOP View Vertical Installation Horizontal Installation Clearance Area Clearance Area 24" 24" Width of Unit Length of Unit Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 23: Duct Connections

    PAA unit can be installed in one of the following configurations: upflow, downflow, horizontal right or NOTE horizontal left orientation. All images displayed in this chapter are for the PAA-A18BA1 (17.5"). Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 24: Th1 Thermistor And Nat Thermostat Installation

    • Use a remote sensor or a remote controller with a built-in sensor. • Place the return air thermistor as far away from the furnace as possible, avoiding bypass ducts, Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 25: Upflow/Downflow Installation

    • 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 hu- midity sensor. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 26 Removal of the side drain pan and top figuration installations. Remove the side drain drain increases airflow and efficiency. pan (as well as its support and 2 triangular Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 27 Step 1: Remove pipe panel which is secured Step 2: Remove front panel which is secured by 5 screws, as displayed below: by 12 screws. (Screws not shown.) Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 28 Step 5: Remove front Z‑bracket, secured by a screw, which is located on the shelf attached to the drain pan. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 29 – Damaging these wires may cause the while the heat exchanger is inside the cab- unit to malfunction. inet. Some parts are not shown for clearer image. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 30 – Drain pan may fall and cause personal injury. PAA unit inverted to show how the 4 screws are removed. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 31 (recycle) the top drain. Step 11: Remove the 2 triangular pieces, held with 6 screws, from the heat exchanger assem- bly. Discard (recycle) the pieces. For PAA-A18 Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 32 Perform the following steps to replace the heat exchanger (without side drain pan) in- side the cabinet. Step 15: Attach the front plate to the main drain pan using the 3 screws. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 33 • Use extreme caution when inserting the heat exchanger back into the cabinet to avoid damaging the thermistor wires. – Damaged thermistor wires may result in improper or dangerous operation of the unit. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 34 Step 18: Replace the 2 side panels (side pipe panel assemblies). Step 19: Replace the pipe panel (main pipe pan- Step 20: Replace the front panel using the 12 el). screws. (Screws not shown.) Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 35: Horizontal Left Installation

    NOTE To remove the heat exchanger from the cabinet, perform steps 1-10 detailed in "Upflow/Downflow Side drain pan must be relocated for horizontal installation" section. left installations. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 36 A) Install the 2 triangle pieces on the left B) For PAA-A18 models, remove top side of the heat exchanger assembly. drain and install to the other side as shown. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 37 Step 4: Attach the heat exchanger to the main side of the main drain pan as shown below. drain pan with the 4 screws. PAA unit inverted to show how the 4 screws are installed. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 38 • Use extreme caution when inserting the heat exchanger back into the cabinet to avoid damaging the thermistor wires. – Damaged thermistor wires may result in improper or dangerous operation of the unit. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 39 Some parts are not shown for clearer image. Step 9: Replace the 2 side panels (side pipe panel assembly). Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 40 UL 508 that will shut off the equipment served prior to overflow of the pan. The pan must be equipped with a fitting to allow for drainage. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 41: Horizontal Right Installation

    ASTM B280 Standard Specification for Seamless Copper Tube for Air Conditioning and Refrigeration Field Service. In addition, be sure that the inner and outer surfaces of the Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 42 0 to 0.02 (0 to 0.5) 1/2 (12.7) (26) 49.0 to 56.4 36 to 42 (500 to 575) 5/8 (15.88) (29) 73.5 to 78.4 54 to 58 (750 to 800) Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 43: Insulation Of Refrigerant Lines

    • If dust, dirt or water gets into the refrigerant cycle, the oil will deteriorate and the compressor may fail. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 44: Piping Size

    Always follow local codes and standards. When mounted vertically, the air handler’s primary drain connection is located in the center of the unit. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 45 24” pan. The pan must be equipped with a fitting to clearance in the front is for routine maintenance allow for drainage. or service. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 46: Float Switch

    If the float switch is not instal- line of the air conditioner, and if water begins to ac- led, Mitsubishi Electric US, Inc. is not responsible cumulate in the drain line, the ball inside the switch for any damage to the furnace.
  • Page 47 Use a level to ensure the float switch is Ensure the stem is as vertical as possible, angled oriented properly as shown. no more than 10 degrees from vertical orienta- tion. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 48: Installing The Control Box

    If installed on the cabinet, control box must be in- stalled in the designated location, depending on the PAA unit orientation. NOTE Recommended control box orientations on the cabinet as shown below. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 49: Control Box - Cabinet Installation

    • Control box must be installed at least 1 inch from the edge of the surface, as shown be- low. • The surface must be flat without any cutouts or depressions. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 50: Control Box - External Installation

    PAA unit surface. Without a gap be- tween the control box and PAA unit cabinet, dew condensation may enter the control box which may result in unit damage or failure. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 51: Electrical Wiring

    • Wire the power supply so that no tension is imparted. Otherwise disconnection, heating or fire may result. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 52: Function Settings

    Filter sign No filter sign indica- Humidifier not sup- ported Humidifier supported Humidifier control Heat mode & Ther- mo ON (applies if Mode 13 = Heat mode Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 53 These furnaces may also be configured for one fan speed operation (Mode 23=1) during heating and cooling with the heat pump which only turns on G in Dry mode, lowering the fan speed and removing more humidity in Dry mode. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 54: Paa Unit Control Box

    ① ⑤ ⑥ ① User interface ④ Control board ② Relay board ⑤ Power board (underneath the control board) ③ Terminal blocks ⑥ AC input terminal block Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 55 ④ CN4F: Float switch (connector col- ① or: white) ② ⑤ CN44: TH02 and TH05 pipe tem- peratures (connector color: white) ⑥ CNF: Humidifier input (connector ③ color: green) ④ ⑤ ⑥ Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 56 Signal W1 to furnace (first stage of Unused heating). Wire color: white Signal W2 to furnace (second stage of RTN (return air temperature sensor). heating). Wire color: brown Wire color: white Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 57: Control Signals To The Furnace

    The G/Y1 signal is energized in Cool, Dry, Heat or Fan modes whenever the fan is turned on. This signal is also energized, as configured, in coordination with the humidifier and ERV/HRV. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 58: Paa Unit Control Options

    2B on the terminal block in the control box. G/Y1 to G and Y1 of the furnace and Y/Y2 to Y2 If the MA remote controller cable exceeds 32 ft of the furnace. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 59: Controller Options

    Wiring that touches sur- rounding parts may be cut by long-term opera- Before installing or servicing the system, always tion. turn off main power to the system. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 60: Dip Switch For Emergency Thermostat

    OFF. You are shock, fire or explosion may occur. now in Test mode. Verify the Test mode indicator (red color) on the control box user interface is ON. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 61 Step 8: Set SW01-4 to OFF to disable Test mode. NOTE • The PAA unit system enters emergency mode if power is still applied to the furnace and (a) Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 62 If operated improperly, it may result in gas leakage/poi- soning, fire or explosion due to unexpected gas furnace operation. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 63 Test mode push button (not illumina- ted, button color: white) W1 and W2 OFF - installer only set- tings. Test mode push button (not illumina- ted, button color: white) Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 64: Balance Points

    Please refer to the to heat with the furnace. controls product manual for more information. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 65: Capacity Balance Point

    Economic Balance Point, then only the fur- run. See diagram below. nace is used for heating. If the outdoor air tempera- ture is above both the Capacity Balance Point and Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 66: Energy Recovery Ventilation (Erv)

    15.10. Energy recovery ventilation (ERV) Part Number: CN24RELAY-KIT-CM3 Max 32 Ft. Part Number: PAC-740 12VDC Coil ERV Switch (field) Max 32 Ft. Control Board In Control Box Control Box Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 67: Hrv/Erv Heating Operation For Mxz/Ntxm Systems

    When the furnace blower is moving air for NTXMPH24/30A132BA/CA HRV/ERV operation, the unit may provide warm air to the occupied space, even in Ther- MXZ-SM36/42/60NAM/2 mo OFF mode. MXZ-SM36/42/48NAMHZ/2 NTXMSM36/48/60A142/182AA/BA NTXMSH36/42/48A142/152/182AA/BA Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 68: Humidifier

    Mode no. Setting Settings Humidifier not supported 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. © 2024 Mitsubishi Electric US, Inc.

  • Page 69: Test Run

    1.0 MΩ. furnace test operation or maintenance, be sure to power up the outdoor unit prior to powering up the furnace. Conversely, when powering down Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 70: Perform Test Run

    12 hours to prevent ler signal receiving breakdown. error If the insulation resistance rises above 1 MΩ, the compressor is not faulty. Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 71: Auto Restart Function

    Other errors (Refer to the out- automatically approximately 4 minutes after power door unit service manual.) is restored. Auto restart function is regulated using the remote controller (Mode no. 01). Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

  • Page 72: Cut Out Gauge

    PAA-A18, 24, 30, 36, 42AA1/BA1/CA1 17. Cut out gauge Refer to section "Float switch", step 3 for use instructions. CUT OUT GAUGE TEMPLATE FOLD LINE 100% SCALE MODEL Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 73 PAA-A18, 24, 30, 36, 42AA1/BA1/CA1 Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.
  • Page 76 This product is designed and intended for use in the residential and commercial environment. Manufactured by: MITSUBISHI ELECTRIC US, INC. Toll Free: 800-433-4822 MEUS DOC# MD-2025-K001 Ver. 3, March 2024 PA79G215H03 Specifications are subject to change without notice. © 2024 Mitsubishi Electric US, Inc.

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