MrCool Universal Series Owner's Manual
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MrCool Universal Series Owner's Manual

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Please read this manual carefully before installation and keep it for future reference.
Owner's Manual
Universal
Series
®
Air Handler
Model - MDUI180**
Due to updates and constantly improving performance, the information and instructions within this
manual are subject to change without notice. Please visit www.mrcool.com/documentation to
ensure you have the latest version of this manual.
Version Date: 10-25-21
Thank you for choosing MRCOOL
. Please read this manual carefully before installation and keep it for future reference.
®
Copyright © 2021 MRCOOL
, LLC
®

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Summary of Contents for MrCool Universal Series

  • Page 1 Air Handler Model - MDUI180** Due to updates and constantly improving performance, the information and instructions within this manual are subject to change without notice. Please visit www.mrcool.com/documentation to ensure you have the latest version of this manual. Version Date: 10-25-21 Thank you for choosing MRCOOL .

  • Page 2: Table Of Contents

    9. Electric Heat Kit Installation ......15 10. Air Handler Field Conversion ......16 11. Electrical Connection ........17 Post Installation Checks ... 23 Troubleshooting ......25 ....Maintenance and Care EU Disposal Guidelines ....29 *Pat. https://mrcool.com/mrcool-patents/ Page 1 mrcool.com...

  • Page 3: Safety Precautions

    fine. These regulations may vary due to the passage of laws. A certified technician must perform the installation and service of this product. Should questions arise, contact your local EPA office. mrcool.com Page 2...
  • Page 4 Product un-installation and recycling must be performed by a certified technician. If the system has a leak-detection system installed, it should be checked for leaks at least once every 12 months. Keep a record of all leak checks for the lifetime of the unit. mrcool.com Page 3...
  • Page 5 8 hours. If it is to be deactivated for a short time, for example, one night, do not cut off the power (this is to protect the compressor). mrcool.com Page 4...

  • Page 6: Appliance Overview

    , we will continuously assess and innovate. We retain the right to make necessary revisions to the product from time to time. We reserve the right to revise the contents of this manual without notice. If the supply cord is damaged, it must be replaced by MRCOOL , a professional service agent, or a similarly ®...

  • Page 7: Accessories

    Please read this manual carefully before installation and keep it for future reference. Owner’s Manual Owner’s Manual UNIVERSAL Series ™ For more details visit www.MrCool.com Liquid Side Stub Kit To connect the unit with the liquid pipe Gas Side Stub Kit To connect the unit...

  • Page 8: Unit Dimensions

    20 in MDUI18024 & MDUI18036 (540 mm) (1224 mm) (540 mm) (295 mm) (508 mm) 21-1/4 in 57 in 20 in 24-3/4 in 11-5/8 in MDUI18048 & MDUI18060 (540 mm) (1448 mm) (508 mm) (630 mm) (295 mm) mrcool.com Page 7...

  • Page 9: Main Parts

    20-11/16 in x 20-5/16 in x 5/8 in (525 mm x 516 mm x 15 mm) NOTE Dry coil and filter should be installed based upon nominal tonnage. Use 0.96 as approximate SCFM correction factor for wet coil (optional). mrcool.com Page 8...

  • Page 10: Unit Installation

    ® Instructions can be found on page 12 View complete install video by scanning this QR code *Pat. https://mrcool.com/mrcool-patents/ CAUTION • Before servicing or installing this equipment, the electrical power to this unit must be in the “OFF” position. • More than one electrical disconnect may exist on this unit. Lock out and tag the switch with a suitable warning label.

  • Page 11: Installation Location

    8 ft (2500 mm). Also make sure the air handler is not accessible to the Fig. 2.2 general public. Fig. 2.1 mrcool.com Page 10...

  • Page 12: Conventional Line Set Installation

    Air Handler line set size matches service valve connection. DO NOT crimp the service valve connector when the pipe is smaller than the connector. See diagram below. MRCOOL Universal Series DC Inverter Fig. 2.3 Must open stop valves after pulling vacuum...

  • Page 13: Vac ® Quick Connect ® Installation

    3/8” Piping/Valve Size 3/4” Allen Wrench Size (Stamped on piping) 52 ft/lb 3/8” 5 mm 3/4” MRCOOL Universal Series 3/4” 8 mm DC Inverter Open the stop/cuto IMPORTANT valves only after connecting the refrigerant lines The stop/cutoff valves on the unit must be opened AFTER connecting the lines and BEFORE turning on the unit.

  • Page 14: Bending The Line Set

    DO NOT connect the condensate drain pipe into the rain pipe. This will prevent rain water from pouring in and causing property loss or personal injury. Drain Connection Unit 2” Minimum Flexible Tubing (Hose or Pipe) 3” Minimum Positive Liquid Seal (Required) Fig. 2.9 mrcool.com Page 13...

  • Page 15: Ductwork

    Please refer to installation instructions provided with the heat kit for the correct installation procedure. WARNING The electrical characteristics of the air handler, the electric heat kit, and the supply power should be identical. mrcool.com Page 14...

  • Page 16: Electric Heat Kit Installation

    MHK20U Circuit Breaker, 20kW heat strip 4 Ton or 5 Ton IMPORTANT You must use a compatible heat kit listed in the above chart. Using an incorrectly sized heat kit could cause the unit to overheat and/or equipment damage. mrcool.com Page 15...

  • Page 17: Air Handler Field Conversion

    Switches may be upside down. This is an example for switch location only. Refer to the illustrations above for settings. Fig 2.12 NOTE Refer to the Universal Condenser Manual for the Dip Switch instructions and settings for the condenser. mrcool.com Page 16...

  • Page 18: Electrical Connection

    Only use the power cables that are delivered along with the air conditioner. If you want to change the power cables, please contact MRCOOL’s local service center. After the electrical installation is finished, please use wire clamps to secure the power cords and thermostat wires.
  • Page 19 6 strand to ensure a proper connection. Please select a proper length of wire according to local conditions. The maximum connection length is 98 feet (30 m). 7. Thermostat wires must not be twisted together. mrcool.com Page 18...
  • Page 20 4.The primary input voltage of transformer is defaulted at 230V(BK). When switching the power supply of the complete unit to 208V, connect the primary input voltage of transformer to 208V(BU), which can be realized by exchanging the black wire and the blue wire. ① 5.①Only applicable for units with ground wire. Fig 2.13 mrcool.com Page 19...
  • Page 21 4. Locate the round terminal conduit. Use a screwdriver to replace it and tighten the terminal screw (as shown in Fig. 2.15). A. Solid Wire B. Braided Wire Solderless Terminal Jacket / Insulation Fig 2.14 Screw with Special Fastener Round Terminal Terminal Board Wire Fig 2.15 mrcool.com Page 20...
  • Page 22 NOTE: For wiring diagram of 4-5 ton MDUI 24K/36K + MHK05U 30 Amps units with electric heater please 45 Amps MDUI 24K/36K + MHK08U refer to the next page. MDUI 36K + MHK10U 60 Amps Fig. 2.17 mrcool.com Page 21...
  • Page 23 NOTE: A Heat Kit Installation Combination Max Amperage is NOT required for the unit to function properly. It is MDUI 48K/60K + MHK15U 60/30 Amps intended for Emergency MDUI 48K/60K + MHK20U 60/60 Amps Heating Purposes ONLY. Fig. 2.18 mrcool.com Page 22...

  • Page 24: Post Installation Checks

    Is the panel mounted securely? It could cause an air leak, vibration, and noise. Are there any cracks in the air return or It could cause an air leak, vibration, and supply pipe? condensation. mrcool.com Page 23...
  • Page 25 1. If all the steps above have been completed, power on the unit. 2. Verify the unit functions properly under several of its different operating modes. 3. If there are any loud and/or abnormal sounds, turn off the unit and contact MRCOOL Tech Support, at ®...
  • Page 26 Filter screen is blocked by dirt. Clean the filter. NOTICE Check the above items and take appropriate corrective measures. If the unit continues to function improperly, immediately disconnect power and contact the MRCOOL® technical department, at (270) 366-0457, or your installation dealer. mrcool.com Page 25...

  • Page 27: Troubleshooting

    fire hazard. DO NOT attempt repairs to the appliance yourself. Improper repair and maintenance can create electric shock and fire hazards. Please contact MRCOOL Tech Support, at ®...
  • Page 28 Bus low-voltage protection Bus high-voltage protection Charge loop error Driver memory chip error High pressure sensor error ODU jumper cap error NOTICE When the unit is connected with the wired controller, the error code will show simultaneously on it. mrcool.com Page 27...

  • Page 29: Maintenance And Care

    Purchase replacement parts from local appointed service center or dealer if necessary. After-Sales Service If the air-conditioning unit you purchased has any quality problem or you have any inquiry, please contact the MRCOOL Tech Support, at (270) 366-0457. ® Warranty should meet the following requirements: 1.

  • Page 30: Eu Disposal Guidelines

    Special notice Disposing of this appliance in the forest or other natural surroundings not only endangers your health, but is also bad for the environment. Hazardous substances may leak into the ground water and enter the food chain. mrcool.com Page 29...
  • Page 31 LICENSE #: INSTALLATION DATE: INSTALLATION LOCATION: SERIAL NUMBER: The design and specifications of this product and/or manual are subject to change without prior notice. Consult with the sales agency or manufacturer for details. Copyright © 2021 MRCOOL , LLC ®...

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Mdui180 series

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