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Please read this manual carefully before installation and keep it for future reference.
Owner's Manual
Universal™ Series
Air Handler | 2-3 Ton
Model - MDUI18024/MDUI18036
Thank you for choosing MRCOOL. Please read this manual carefully before installation and keep it for future reference.
Copyright © 2020 MRCOOL, LLC | v3.26.20
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Table of Contents
Related Manuals for MrCool MDUI18024
Summary of Contents for MrCool MDUI18024
- Page 1 Please read this manual carefully before installation and keep it for future reference. Owner’s Manual Universal™ Series Air Handler | 2-3 Ton Model - MDUI18024/MDUI18036 Thank you for choosing MRCOOL. Please read this manual carefully before installation and keep it for future reference. Copyright © 2020 MRCOOL, LLC | v3.26.20...
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Page 2: Table Of Contents
5. Ductwork ............14 6. Electric Heater ..........14 7 Air Handler Field Conversion ......16 8. Electrical Connection ........17 Post Installation Checks ... 23 Troubleshooting ......25 ....Maintenance and Care EU Disposal Guidelines ....30 Page 1 mrcool.com... -
Page 3: Safety Precautions
CEC (by authorized personnel only.) Contact an authorized service technician for repair or maintenance of the unit. Only use the included accessories and specified parts for installation. Using non-standard parts can cause water leakage, electrical shock, or fire and may cause the unit to fail. mrcool.com Page 2... - Page 4 Product uninstallation 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 every 12 months. Keep a record of all leak checks for the lifetime of the unit. mrcool.com Page 3...
- Page 5 Before operating the unit under low temperature, connect it to power for 8 hours. If it is 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...
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Page 6: Appliance Overview
We reserve the right to revise the contents of this manual without notice. 8. If the supply cord is damaged, it must be replaced by MRCOOL, a professional service agent or similarly qualified person in order to avoid damage to the product. -
Page 7: Accessories
Please read this manual carefully before installation and keep it for future reference. Owner’s Manual Owner’s Manual (this) UNIVERSAL Series ™ For more details visit www.MrCool.com Liquid Side Stub Kit To connect the unit with the liquid pipe To connect the unit Gas Side Stub Kit with the gas pipe OPTIONAL ®... -
Page 8: Unit Dimensions
Appliance Overview Unit Dimensions MDUI18024/MDUI18036 Fig. 1.1 Unit Dimensions (Inches/MM) Width Depth Height 21-1/4in. (540)mm 48-1/4in. (1224mm) 11-5/8in. (295mm) 20in. (508mm) 21-1/4 in. (540mm) mrcool.com Page 7... -
Page 9: Main Parts
Evaporator Fig. 1.2 Assembly Primary Drain Pan Model Cooling capacity (ton) Optional electric heater (kW) 5-10 MDUI18024 / MDUI18036 Motor @ 230V ～, 60Hz Model MDUI18024 / MDUI18036 Unit: inch ( mm) Model Filter size MDUI18024 / MDUI18036 19-5/16×20-5/16× 5/8 (490×516×15) mrcool.com... -
Page 10: Unit Installation
This product is designed and manufactured to comply with national codes. It is installer’s responsibilities to install the product in accordance with such codes and/or any prevailing local codes/regulations. The manufacturer assumes no responsibilities for equipment installed in violation of any codes or regulations. 4. Replacement Parts... (continued on following page) mrcool.com Page 9... -
Page 11: Installation Location
8 Fig. 2.2 feet/2500mm. and the air handler is not accessible to the general public. Fig. 2.1 mrcool.com Page 10... -
Page 12: Conventional Line Set Installation
Specification of Connection Pipe External diameter (inch) Model Vapor pipe Liquid pipe MDUI18024 / MDUI18036 Piping Preparation WELD Type Complete Unit Replacement Air Handler All cut ends are to be round, burr free, and cleaned. Failure to follow this practice increases the chances for refrigerant leakage. Line set size matches service valve connection. -
Page 13: Vac® Quick Connect ® Installation
Air Handler 70 N 3/8” 50 N 3/8” 3/4” 70 N 3/4” MRCOOL Universal Series DC Inverter Open the stop valve only after connecting the refrigerate lines Connect using precharged A-coil Precharged line set with quick connect with 410 Refrigerate ttings in length 15, 25, 35, 50 feet Failure to follow the instructions provided could result in severe harm to you, this product, or other property. -
Page 14: Condensate Removal
See the following figure for details of a typical condensate line “P” trap. Drain Connection Unit 2” Minimum Flexible Tubing (Hose or Pipe) 3” Minimum Positive Liquid Seal (Required) Fig. 2.6 mrcool.com Page 13... -
Page 15: Ductwork
Please refer to installation instructions provided with heater kit for the correct installation procedure. WARNING • The electrical characteristics of the air handler, the electric heater kit, and the supply power should be identical. mrcool.com Page 14... - Page 16 If a circuit breaker is not installed, do not knock off the holes; otherwise, electric shock may occur. Replace access panel and check operation. 10) Connect power temperature controller cords. Compatible Heat Kits for Model# MDUI18024/MDUI18036 Fig 2.7 Kit #. Description MHK05U...
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Page 17: Air Handler Field Conversion
3 on SA2 and SA1 to Up. Location of Fig. 2.8 Fig. 2.9 Dip Switch on Air Handler Main Board DEFAULT 3 TON 2 TON SETTING 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
Do not change the length and terminals of the power cables. If you want to change the power cables, please contact MRCOOL’s local service center. Wiring terminals should be connected firmly to the terminal board. Loose connection is not safe. - Page 19 Outdoor Unit Model Power Supply Ampacity Protection (A) 208/230V MDUI18024/MDUI18036 5 amps 15 amps 60Hz . The fuse is located on the main board. . Install a circuit breaker at every power terminal near the units (indoor unit and temperature controller) with at least 0.12in (3mm) contact gap.
- Page 20 Use a round terminal fastener or clamp to secure the round terminal firmly on the peeled wire end. Locate the round terminal conduit. Use a screwdriver to replace it and tighten the terminal screw (as shown in Fig. 2.10). A. Solid Wire B. Braided Wire Solderless Terminal Fig. 2.10 Jacket / Insulation mrcool.com Page 19...
- Page 21 4.The primary input voltage of transformer is defaulted at 208V. When switching the power supply of the complete unit to 230V, connect the primary input voltage of transformer to 240V, which can be realized by exchanging the blue wire and the black wire. ① 5.Only applicable for iron shell motor. mrcool.com Page 20...
- Page 22 Refer to Fig. 2.13 on the next page Lead the connection wire and power cord through the insulation tube. Then secure the wires with wire clamps (as shown in Fig. 2.12). Insulation Tube Cord Clamp Fig. 2.12 mrcool.com Page 21...
- Page 23 When connecting the power cord, make sure the phase sequence of the power supply matches with the corresponding terminals, otherwise the compressor will get reversed and operate abnormally. Electrical wiring of Single-phase unit: MDUI18024/MDUI18036 Fig. 2.13 mrcool.com Page 22...
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Page 24: Post Installation Checks
It may cause air leak, vibration, and Is the panel mounted firmly? condensation. Are there any cracks in the air return It may cause air leak, vibration, and or supply pipe? condensation. mrcool.com Page 23... - Page 25 Operation After Connecting The Power: If all the above steps are complete, power on the unit. If there are any loud and/or abnormal sounds, turn off the unit and contact MRCOOL Tech Support immediately. Verify the unit operates normally under several modes.
- Page 26 Reduce heat source. Filter screen is blocked by dirt. Clean the lter. NOTICE Check the above items and take appropriate corrective measures. If the unit continues to function improperly, immediatey disconnect power and contact MRCOOL or your installation dealer. mrcool.com Page 25...
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Page 27: Troubleshooting
Indoor fan can be set as “ON” or “AUTO” Indoor unit still After every indoor unit receives "stop" mode. Under “ON” mode, indoor fan runs after signal, fan will keep running. will keep running after switching o the switched o . unit. mrcool.com Page 26... - Page 28 WARNING When abnormalities occur, stop the unit immediately and disconnect power. Contact MRCOOL. 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.
- Page 29 Bus low-voltage protection Bus high-voltage protection Charge loop error Input voltage error Driver memory chip 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 28...
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Page 30: Maintenance And Care
First run of the unit should be operated by professional personnel from factory appointed service center. Only factory manufactured accessories can be used on the machine. All the instructions listed in this manual should be followed. Warranty will be automatically voiced if the above requirements are not met. mrcool.com Page 29... -
Page 31: Eu Disposal Guidelines
Sell the appliance to certified scrap metal dealers. Special notice Disposing of this appliance in the forest or other natural surroundings endangers your health and is bad for the environment. Hazardous substances may leak into the ground water and enter the food chain. mrcool.com Page 30... - Page 32 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 © 2020 MRCOOL, LLC...
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