Please read this manual carefully before installation and keep it for future reference. Owner’s Manual Universal Series ® Air Handler (High ESP) Model - MDUI180**E 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®.
Contents ! Safety Precautions ....................... 2 1 Appliance Overview ..................... 5 1. 2. 3. 4. Introduction ........................................................ 5 Accessories ........................................................ 6 Unit Dimensions ................................................ 7 Main Parts ........................................................... 8 2 Unit Installation ........................... 9 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.
Safety Precautions Safety Precautions Read Before Installation ! Incorrect installation may cause serious damage or injury. The seriousness of potential damage or injuries is classified as either a WARNING or CAUTION. This symbol indicates ignoring instructions may cause death or serious injury. WARNING This symbol indicates that ignoring instructions may cause moderate personal injury, damage to the unit, or other property.
Safety Precautions 6. Install the unit in a firm location that can support the unit’s weight. If the installation location cannot support the weight, or the installation is performed improperly, the unit could fall and cause serious personal injury and/or property damage. 7. For all electrical work, follow all appropriate wiring standards, regulations, and the installation manual. 8. You must use an independent circuit to supply power. DO NOT connect other appliances to the same circuit.
Safety Precautions DO NOT install the unit within 3 ft (1 m) of combustible materials if the unit is equipped with an auxiliary electric heater. DO NOT install the unit in a location where it could be exposed to combustible gases. If combustible gas accumulates around the unit, it could cause fire. 1. 2. DO NOT operate your air conditioner in a room where it could be exposed to excessive amounts of water, such as a bathroom or laundry room.
Safety Precautions Appliance Overview 1 To Our Customers; Thank you for choosing a MRCOOL® home HVAC product. Please read this manual carefully before installation and operation of the Universal™ Series High-ESP Air Handler to ensure correct use and handling. In addition to the safety precautions in the previous section, please adhere to the following guidelines and note our exceptions to liability. 1.
Appliance Overview The Universal® Series Air Handler (High-ESP) offers the perfect combination of superior product quality, operating efficiency, operating sound levels, and value for money. It uses the environmentally friendly refrigerant R-410A, which is chlorine-free to help prevent damage to the ozone layer. Unless otherwise stated (as “OPTIONAL”) the air conditioning system includes the following accessories. Use all of the installation parts and accessories to install the air conditioner.
Appliance Overview Unit Dimensions MDUI18024E/MDUI18036E & MDUI18048E/MDUI18060E A B H Fig. 1.1 W D Unit Dimensions: Inches (mm) Page 7 Depth Height A B Model Width MDUI18024E & MDUI18036E 21-1/4 in (540 mm) 21-1/4 in (540 mm) 48-1/4 in (1224 mm) 20 in 11-5/8 in (295 mm) (508 mm) MDUI18048E & MDUI18060E 24-3/4 in (630 mm) 21-1/4 in (540 mm) 57 in (1448 mm) 20 in 11-5/8 in (295 mm) (508 mm) mrcool.
Appliance Overview Main Parts Electric Box Assembly Centrifugal Fan Fan Motor Secondary Drain Pan Evaporator Assembly Fig. 1.2 Primary Drain Pan Model Cooling capacity (ton) 3.0 MDUI18024E / MDUI18036E 4.0 MDUI18048E MDUI18060E 5.
2 Unit Installation The Universal™ Series Has 2 Installation Methods 1. The Conventional Weld Line Set Installation MRCOOL® Preferred Method Instructions can be found on page 11 OR View complete install video by scanning this QR code 2. No-Vac® Quick Connect® Line Set* Installation Instructions can be found on page 13 OR View complete install video by scanning this QR code *Pat. https://mrcool.
Unit Installation Installation Location WARNING • When installing the air handler, take consideration to minimize the length of refrigerant piping as much as possible. • When installing in an area directly over a finished ceiling (such as an attic), installation of an emergency drain pan is required directly under the unit. See local and state codes for requirements. • When installing this unit in an area that may become wet, elevate the unit with a sturdy, non-porous material.
Unit Installation - OPTION 1: Conventional Weld / Flare Line Set Conventional Line Set Installation Specification of Connection Pipe IMPORTANT External Diameter (inch) Model Vapor Pipe Liquid Pipe 3/4 in 3/8 in MDUI18024E / MDUI18036E (2-3 ton) MDUI18048E / MDUI18060E (4-5 ton) In order to prevent the refrigerant piping from sweating, you can insulate them with closed-cell insulation foam for refrigerant line sets which is readily available. Piping Preparation 1.
Unit Installation OIL RETURN BENDS Add an oil return bend as described below: • If the outdoor unit is installed beneath the indoor unit, install an oil return bend every 20 ft (6 m). A non-return bend is not needed in this configuration. Please refer to Fig. 2.6 below: • If the outdoor unit is installed above the indoor unit, install an oil return bend every 20 ft (6 m). It is also necessary to add a non-return bend at the lowest and highest position of the vertical pipe, as shown below in Fig. 2.
No-Vac® Quick Connect® Line Set Installation INSTRUCTIONS FOR USE WITH NO-VAC™ QUICK CONNECT® LINE SET SOLD SEPARATELY KINK RESISTANT, PRECHARGED, SIMPLE SECURE QUICK CONNECT, 100% CONNECTION GUARANTEE Please read and follow the instruc�ons and diagram below* : Connec�ons must be made exactly as specified to avoid system leaks and /or damage IMPORTANT 1. Take out matching male connectors M1 and M2. When running the Line Set 2.
Unit Installation Bending the Line Set 1. Use your hands to bend the pipes. Work carefully not to collapse the pipes during bending. 2. If the pipe is repeatedly bent or extended, it will become hard and difficult to manipulate. Avoid bending or extending the pipe more than 3 times. MINIMUM BEND RADIUS DO NOT bend the pipes in at an angle greater than 90°. When bending connective refrigerant piping, the minimum bending radius is 4 in (10 cm). Refer to Fig. 2.10.
Unit Installation Ductwork This air handler is designed for a complete supply and return ductwork system. WARNING DO NOT operate the unit without all ductwork completed and attached. • Inadequate ductwork that restricts airflow can result in improper performance and failure of the compressor or heater. • Ductwork is to be constructed in a manner that limits restrictions and maintains suitable air velocity. • Ductwork is to be sealed to the unit in a manner that will prevent leakage.
Unit Installation Electric Heat Kit Installation (continued) CAUTION Ensure that all power supply is disconnected prior to installing the heat kit. A means of strain relief and conductor protection must be provided at the supply wire entrance into cabinet. Only use copper conductors. Installation must follow National Electric Code (NEC) and other applicable codes.
Unit Installation Air Handler Field Conversion Converting a 5-Ton Unit to 4-Ton Converting a 3-Ton Unit to 2-Ton Follow these instructions during unit installation in order to enable a Universal® Series 3-ton condenser and air handler split system to operate at 2-ton capacity. 1. 2. 3. 4. DO NOT attempt this conversion while the unit is powered on. Locate the capacity dip switch on the air handler main board. The capacity dip switch is circled on the photo below.
Unit Installation Set Indoor Fan Speed/Dip Switch Configuration The High ESP Air Handler comes equipped with an 8-speed fan. Below are settings for the dip switches (found on the indoor main control board) in order to adjust the fan to each of the speeds for the 2-3 Ton unit (For the 4-5 Ton unit, please refer to the following page). The higher the level, the higher the speed of the indoor unit fan. The default setting is Level 4. NOTE: Dip switch settings must be configured before powering on the unit.
Unit Installation Fan Speed/Dip Switch Settings for MDUI18048E/MDUI18060E (4-5 Ton) Model 48K Indoor Unit Dip Switches 60K Indoor Unit Dip Switches Level Heat (SA2) Cool (SA1) Level 1 1 0 0 0 0 0 0 0 Level 2 1 0 0 1 0 0 0 0 Level 3 1 0 1 0 0 0 0 0 1 0 1 1 0 0 0 0 Level 5 1 1 0 0 0 0 0 0 Level 6 1 1 0 1 0 0 0 0 Level 7 1 1 1 0 0 0 0 0 Level 8 1 1 1 1 0 0 0 0 Level 1 0 0 0 0 0 0 0 0 Level 2 0 0 0 1 0 0 0 0 Level 3
Unit Installation Air Flow Volume Under Different ESP & Fan Speed: MDUI18024E/MDUI18036E (2-3 Ton) Model MDUI18024E Static pressure(Inches W.C.) Level 0 Speed 1(CFM) 1030 0.1 900 0.15 840 0.2 0.3 0.4 0.5 0.6 Speed 2(CFM) 1080 960 Speed 3(CFM) 1220 1120 Speed 4(CFM) 1390 1290 0.
Unit Installation Air Flow Volume Under Different ESP & Fan Speed: MDUI18048E/MDUI18060E (4-5 Ton) Model MDUI18048E Static pressure(Inches W.C.) Level 0 0.1 0.15 Speed 1(CFM) 1640 1500 1450 Speed 2(CFM) 1680 1560 1500 0.2 1350 0.3 0.4 0.5 0.
Unit Installation Electrical Connection Vacuum Lines Electrical Regulations WARNING Before performing electrical work, read the following regulations 1. Electrical installation must be conducted by professionals in compliance with local laws, regulations, and this installation manual. 2. Never artificially extend the length of a power cord. 3. The electric circuit must be equipped with a circuit breaker and air switch. Both must have sufficient capacity. 4.
Unit Installation Electrical Connection Electrical Parameters Power Supply Min. Circuit Ampacity Max. Overcurrent Protection (A) MDUI18024E/MDUI18036E 208/230V (60 Hz) 4 amps 15 amps MDUI18048E/MDUI18060E 208/230V (60 Hz) 8 amps 15 amps Indoor Unit Model 1. The fuse is located on the main board. 2. Install a circuit breaker at every power terminal near the units (indoor unit and thermostat) with at least 0.12 in (3 mm) contact gap. Both units must reach the plug. 3.
Unit Installation Electrical Connection Connecting the Power Cord & Thermostat Wires For solid wires (Refer to Fig. 2.15 A): 1. Use wire cutters to cut off the wire end and then peel away about 1 in (25 mm) of the insulation layer. 2. Use a screwdriver to unscrew the terminal screw on the terminal board. 3. Use nippers to bend the solid wire into a ring that fits the terminal screw. 4. Form a proper ring and attach to the terminal board. Use a screwdriver to tighten the terminal screw.
Unit Installation Electrical Connection Electrical wiring of ESP Air Handler MDUI18024E/MDUI18036E (With & Without Heat Pump) High ESP Air Handler w/cooling only condenser High ESP Air Handler w/heat pump condenser NOTE: B and D terminals are not used in cooling only condenser Fig. 2.19 Fig. 2.
Unit Installation Electrical Connection Wiring Diagram of MDUOC18024E/MDUI18036E (2-3 Ton with Electric Heat Kit) NOTE: A Heat Kit Installation is NOT required for the unit to function properly. It is intended for Emergency Heat Purposes ONLY. Optional: Heat Kit Installation Instructions 1. 2. 3. 4. 5. Remove the upper access panel from the air handler. Remove the cover plate inside the upper access panel of the air handler.
Unit Installation Electrical Connection Wiring Diagram of MDUOC18048E/MDUI18060E (4-5 Ton with Electric Heat Kit) NOTE: A Heat Kit Installation is NOT required for the unit to function properly. It is intended for Emergency Heat Purposes ONLY. Optional: Heat Kit Installation Instructions 1. 2. 3. 4. 5. Remove the upper access panel from the air handler. Remove the cover plate inside the upper access panel of the air handler.
3 Post Installation Checks Before Test Run Only perform test run AFTER you have completed the following steps: • Electrical Safety Checks – Confirm that the electrical system is safe and operating properly. • Gas Leak Checks – Check all refrigerant piping connections/valves and confirm that the system is not leaking. • Confirm that gas and liquid (high and low pressure) valves are fully open.
Post Installation Checks Test Run Preparation Before Connecting The Power: DO NOT connect power unless installation is complete. 1. Verify the control circuit is correct and all the wires are firmly and securely connected. 2. Ensure valves on the vapor and liquid refrigerant lines are completely opened. 3. Remove any scattered objects or debris, especially metal filings, thrum, and clippings. 4. Ensure the unit’s appearance and piping system have not been damaged during transportation or handling. 5.
Outdoor Unit Installation Troubleshooting Maintenance 44 (1) If your air conditioner fails to function normally, check the following items before conducting maintenance: Problem The unit will not activate. The unit operates but stops immediately. Cause Corrective Measure The unit is not connected to a power supply. Connect it to the power supply. Low voltage. Check the circuit voltage is within specified range. Fuse broken or circuit breaker trips. Replace fuse or reconnect circuit breaker.
Troubleshooting (2) The following situations are not operation failures. Problem Time of Occurrence When unit is started immediately Unit does not run. after it is just turned off. When power is turned on. Mist comes from the unit. The unit generates noise. Dust comes from the unit. The unit emits odor. Indoor unit still runs after being switched off. Cause Overload protection switch causes a 3 minute delay. Start up could be delayed up to 1 minute. During operation.
Troubleshooting WARNING • When abnormalities occur, stop the unit immediately and disconnect power. Contact MRCOOL® Tech Support, at (270) 366-0457. If the unit continues to run abnormally, it may damage the unit and cause an electric shock or a 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 (270) 366-0457 for further guidance or a qualified professional for repairs. mrcool.
Maintenance and Care Regular checks, maintenance, and care should be performed by professional personnel, which will extend the lifespan of the unit. 5 Drain Pipe Regularly check the drain pipe for clogs in order to ensure smooth condensate drainage. Notice Before Seasonal Use 1. 2. 3. 4. 5. Check the inlet/outlet of the indoor unit and ensure it is not clogged. Check the ground wire and ensure it is securely connected. Check if the filter screen has been installed correctly.
Refrigerant Piping Connection EU Disposal Guidelines 6 This appliance contains refrigerant and other potentially hazardous materials. When disposing of this appliance, the law requires special collection and treatment. DO NOT dispose of this product as household waste or unsorted municipal waste. When disposing of this appliance, you have the following options: • Dispose of the appliance at a designated municipal electronic waste collection facility.
Universal Series ® ELECTRICIAN and/or HVAC TECHNICIAN: 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.
