MRCOOL MDHP1824NK25H00 - Manuals

Page 4 Safety Precautions mrcool.com 1.2. For units that have an auxiliary electric heater, DO NOT install the unit within 3 feet (1 meter) of combustible materials. DO NOT install the unit in a location that may be exposed to combustible gases. If combustible gas accumulates around the unit, it may...

Page 5 Safety Precautions mrcool.com 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 Air Handler to ensure correct use and handling. In addition to the safety precautions in the previou...

Page 6 mrcool.com Appliance Overview 1 1 (this) 1 1 Owner’s Manual Liquid Side Stub Kit (Optional - Sold Separately) Gas Side Stub Kit (Optional - Sold Separately) PART LOOKS LIKE... QUANTITY Unless otherwise stated (as “OPTIONAL”) the air conditioning system includes the following accessories. Use ...

Page 7 mrcool.com Appliance Overview Fig. 1.1 Unit Dimensions MDUI18048/MDUI18060 Unit Dimensions (Inches/MM) Width Depth Height A B 24-3/4 in. (630mm) 21-1/4in. (540mm) 57in. (1448mm) 11-5/8in. (295mm) 20in. (508mm) A H W D B

Page 8 mrcool.com Appliance Overview Main Parts Electric Box Assembly Centrifugal Fan Fan Motor Secondary Drain Pan Evaporator Assembly Primary Drain Pan NOTE 1. Dry coil and filter should be installed based upon nominal tonnage. 2. Use 0.96 as approximate SCFM correction factor for wet coil (optiona...

Page 9 mrcool.com Pre-Installation Instructions 1. Checking Product Received After receiving the product, please check for any damage caused by transportation. Shipping damage is the responsibility of the carrier. Verify the model number, specifications, and accessories are correct prior to installat...

Page 10 mrcool.com Unit Installation Installation Location WARNING • This air handler is designed for indoor installation only. Do not install it outdoors. • When installing the air handler, take consideration to minimize the length of refrigerant tubing as much as possible. • When installing in an ...

Page 11 mrcool.com Unit Installation - OPTION 1: Conventional Weld / Flare Line Set Conventional Line Set Installation Specification of Connection Pipe Piping Preparation 1. WELD Type Complete Unit Replacement All cut ends are to be round, burr free, and cleaned. Failure to follow this practice incre...

Page 12 mrcool.com Unit Installation - OPTION 2: No-Vac ® Quick Connect ® Line Set INSTRUCTIONS FOR USE WITH NO-VAC™ QUICK CONNECT® LINE SET SOLD SEPARATELY KINK RESISTANT, PRECHARGED, SIMPLE SECURE QUICK CONNECT, 100% CONNECTION GUARANTEE www.mrcool.com v01-07-2020 Please read and follow the instru...

Page 13 mrcool.com Unit Installation Condensate Removal 1. DO NOT connect the condensate drain pipe into the waste pipe or other pipelines that are likely to produce corrosive or peculiar smells. This will prevent odors from entering indoors or corrupting the unit. 2. DO NOT connect the condensate d...

Page 14 mrcool.com Unit Installation Ductwork This air handler is designed for a complete supply and return ductwork system. Return ductwork: Do not install and/or position ductwork in an area that can introduce toxic, or objectionable fumes/odors into the ductwork. The return ductwork is to be intr...

Page 15 mrcool.com Unit Installation CAUTION 1. Ensure that all power supply is disconnected prior to installing the heater kit. 2. A means of strain relief and conductor protection must be provided at the supply wire entrance into cabinet. 3. Only use copper conductors. 4. Installation must follow ...

NOTE Refer to the Universal® Condenser Manual for the Dip Switch instructions and settings for the condenser. mrcool.com Page 16 Fig. 2.8 Fig. 2.9 Location of Dip Switch on Air Handler Main Board Unit Installation Converting Unit From 5 Ton to 4 Ton Follow these instructions during unit installation...

Page 17 mrcool.com Unit Installation 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. Never artificially extend the length of a power cord. T...

Page 18 mrcool.com Unit Installation Outdoor Unit Model Power Supply Max. Overcurrent Protection (A) 208/230V 60Hz 15 amps 4 amps MDUI18048/MDUI18060 Min. Circuit Ampacity Electrical Connection Electrical Parameters 1 . The fuse is located on the main board. 2 . Install a circuit breaker at every po...

Page 19 mrcool.com Unit Installation Electrical Connection Connecting the Power Cord & Thermostat Wire For solid wires ( Refer to Fig. 2.10 A ): 1. Use wire cutters to cut off the wire end and then peel away about 25mm of the insulation layer. 2. Use a screwdriver to unscrew the terminal screw on...

Page 20 mrcool.com Unit Installation Electrical Connection Connecting the Power Cord & Thermostat Wire AP1 Power G L1 L2 Fan motor 1 XT3 TC RD BK BU Y E W H 1 X1 2 3 4 5 6 G M XT1- L1 XT1- L2 Note: 1.Please refer to the instruction manual to check whether the unit can connect to the engineering ...

Page 21 mrcool.com Screw with Special Fastener Round Terminal Wire Terminal Board For all terminal wiring ( Refer to Fig. 2.13 on the next page ): Lead the thermostat wire and power cords through the insulation tube. Then secure the wires with wire clamps (as shown in Fig. 2.12 ). Fig. 2.12 Fig. 2.1...

Page 22 mrcool.com Unit Installation WARNING 1. High and low voltage wires should be led through different rubber rings of the electric box cover. 2. Do not bundle the thermostat wires or lay them side by side, otherwise errors will occur. 3. High and low voltage wires should be secured separately. S...

Page 23 mrcool.com Refrigerant Piping Connection List of Checks to Perform Possible Malfunctions PASS/FAIL Is the main body installed securely? Did you conduct a water leakage test? Is the unit well insulated from heat? Does water drain properly from drain hose? Is the voltage consistent with specifi...

Page 24 mrcool.com Post Installation Checks Preparation Before Connecting The Power: 1. Power must not be connected if the installation is not complete. 2. Verify the control circuit is correct and all the wires are firmly connected. Valves on the vapor and liquid line should be completely open. 3. R...

Page 25 mrcool.com Outdoor Unit Installation Maintenance 4 4 Troubleshooting (1) If your air conditioner fails to function normally, check the following items before conducting maintenance: Problem Cause Corrective Measure The unit will not activate. Abnormal cooling or heating. The unit operates bu...

Page 26 mrcool.com Troubleshooting Problem Time of Occurrence Cause Mist comes from the unit. Unit doesn’t run. The unit generates noise. The unit emits odor. Indoor unit still runs after switched off. Dust comes from the unit. During operation. When power is turned on. When unit is started immediat...

Page 27 mrcool.com Troubleshooting Error Code WARNING 1) 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. 2) DO NOT attempt repairs to the appliance y...

5 Page 29 mrcool.com Maintenance and Care Drain Pipe Notice Before Seasonal Use Regular check, maintenance, and care should be performed by professional personnel, which will prolong the life span of the unit. Regularly check the drain pipe for clogs in order to ensure smooth condensate drainage. Pu...

Page 30 mrcool.com Refrigerant Piping Connection Special notice This appliance contains refrigerant and other potentially hazardous materials. When disposing of this appli - ance, the law requires special collection and treatment. DO NOT dispose of this product as household waste or unsorted municip...

Universal ® Series 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 . ELECTRICIAN and/or HVAC TECHNICIAN: LICENSE #: INSTALLATION DATE: INSTALLATION LOCATION:...