Please read this manual carefully before installation and keep it for future reference. Owner’s Manual Universal™ Series DC Inverter / Condenser Thank you for choosing MRCOOL Please read this manual carefully before installation and keep it for future reference. Copyright © 2019 MRCOOL, LLC | v1.10.
Contents ! Safety Precautions ................................... 2 1 Appliance Overview ................................. 5 1. 2. 3. 4. Introduction .................................................................. 5 Accessories .................................................................. 6 Operating Range .......................................................... 7 Unit Dimensions .......................................................... 7 2 Unit Installation ........................... 8 1.
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 injury to your person, damage to your unit, or other property.
Safety Precautions 5. 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 may fall and cause serious injury and/or damage. 6. For all electrical work, follow all appropriate wiring standards, regulations, and the Installation Manual. 7. You must use an independent circuit to supply power. Do not connect other appliances to the same circuit.
Safety Precautions 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 cause fire. DO NOT operate your air conditioner in a wet room such as a bathroom or laundry room. Too much exposure to water may cause electrical components to short circuit. 1.
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 Univeral™ Series Central HVAC System to ensure corect 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 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. Improper installation may result in water leakage, electrical shock, fire, or equipment failure. PART LOOKS LIKE... QUANTITY Please read this manual carefully before installation and keep it for future reference.
Appliance Overview Operating Range Outdoor Temperature COOLING HEATING 5°F(-15°C) ~ 125.6°F (52°C） -22°F(-30°C) ~ 86°F (30°C) Unit Dimensions MDUO18024036 Fig. 1.2 Outdoor Unit Dimensions Width (A) x Height (C) x Depth (G) MDUO18024036 Page 7 37 x 32.25 x 18.125 in. 940 x 820 x 460 mm Mounting Dimensions Width (A / D) 37 / 24 in. 940 / 610 mm mrcool.com Depth (B / E) 20.875 / 19.125 in.
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 pages 14 through 21 OR View complete install video by scanning this QR code 2. No-Vac® Quick Connect® Line Set Installation Instructions can be found on page 22 OR View complete install video by scanning this QR code Installation Location WARNING 1.
Unit Installation Installation Location For best performance of the outdoor unit, make sure its installation space conforms to the following installation dimensions... For installation of a single condenser refer to fig 2.1 below: E e B Hb C H c b A a d D Hd A~E B A,B,C, B,E A,B,C,E D D,E B,D B,D,E Page 9 Hb Hb < Hd Hb >Hd Hd — — — — — — H Hd > H Hd < H Hb ≤ 1/2H Hb < Hd 1/2H < Hb ≤ H Hb > H Hd ≤ 1/2H Hb > Hd 1/2H < Hd ≤ H Hd > H a ≥ 11.81” 300mm ≥ 11.81” 300mm Fig. 2.
Unit Installation Installation Location For best performance of the outdoor unit, make sure its installation space conforms to the following installation dimensions... For installation of multiple condensers side by side refer to fig 2.2 below: E e ≥ 15.75” 400mm C ≥ 15.75” 400mm B Hb c b D Hd A~E Hb B,D B,D,E Hd H — — — — A,B,C, A,B,C,E D D,E Hb < Hd A d Hd > H Hd ≤ 1/2H Hb >Hd Hd < H Hb ≤ 1/2H Hb < Hd 1/2H < Hb ≤ H Hb > H Hd ≤ 1/2H Hb > Hd 1/2H < Hd ≤ H Hd > H a ≥ 11.81” 300mm ≥ 11.
Unit Installation Installation Location For best performance of the outdoor unit, make sure its installation space conforms to the following installation dimensions... For installation of multiple condensers in rows refer to fig 2.3 below: .5” 57 mm 1 ≥ 00 40 ≥ 7.87” 200mm ≥ 7.87” 200mm ≥ 7.874” 2000mm ≥ 15.75” 400mm ≥ 15.75” 400mm Hb 7” 7.1 m 7 ≥ 1 00m 45 H ≥ 23.62” 600mm 4” .87 mm 7 ≥ 00 20 Hb H Hb ≤ 1/2H 1/2H < Hb ≤ H Hb > H Page 11 B Fig. 2.3 inches (”) millimeters (mm) B ≥ 9.
Unit Installation Installation Location For best performance of the outdoor unit, make sure its installation space conforms to the following installation dimensions... For installation of multiple condensers on a vertical face refer to fig 2.4 below: ≥ 15.75” 400mm ≥ 19.69” 500mm WALL ≥ 7.874” 2000mm Fig. 2.4 ≥ 15.75” 400mm ≥ 19.69” 500mm ≥ 11.81” 300mm mrcool.
Unit Installation Outdoor Unit Installation 1. If the outdoor unit is installed on a solid surface such as concrete, use M10 screw bolts and nuts to secure the unit. Make sure the unit stands erect and level. 2. Do not install it on top of a building. 3. If the unit vibrates and generates noise, add rubber cushions between the unit’s feet and the installation surface. 4. When the outdoor unit is in heating or defrosting mode, it must drain water.
Unit Installation Conventional Line Set Installation INSTALLATION METHOD Connect the refrigerant lines to the unit first. When bending a refrigerant pipe, be careful not to kink or crimp the pipe. Do not over-tighten the screw nut, otherwise leakage may occur. The outside of the refrigerant pipe should have a layer of insulating cotton to protect it from mechanical damage during installation, maintenance and transportation. Refrigerant lines should adopt water-proof insulating material.
Unit Installation OIL RETURN BENDS Add an oil return bend as described below: IF Outdoor unit is beneath the indoor unit, there is no need to add a non-return bend at the lowest or highest position of the vertical pipe, as shown below in Fig. 2.6: IF Outdoor unit is above the indoor unit, it is necessary to add an oil return bend and a non-return bend at the lowest and highest position of the vertical pipe, as shown below in Fig. 2.
Unit Installation Conventional Line Set Installation Pipe Cutting Step 1: Cut Pipe 1. When preparing refrigerant pipes, take extra care to cut and flare them properly. This will ensure efficient operation and minimize the need for future maintenance. 2. Measure the distance between the indoor and outdoor units. 90° Oblique Rough Warped 3. Using a pipe cutter, cut the pipe a little longer than the measured distance. 4. Make sure that the pipe is cut at a perfect 90° angle. Refer to Fig. 2.
Unit Installation Conventional Line Set Installation Pipe Flaring Step 3: Flare pipe ends Flare nut Proper flaring is essential to achieve an airtight seal. 1. After removing burrs from cut pipe, seal the ends with PVC tape to prevent foreign materials from entering the pipe. 2. Sheath the pipe with insulating material as necessary Copper pipe 3. Remove the cut-off valve of outdoor unit and take out the flare nut from the bag of indoor unit accessories. Fit the flare nut on the pipe - see Fig 2.11. Fig. 2.
Unit Installation Conventional Line Set Installation Replacement Condenser Only Existing Air Handler Fig. 2.15 MRCOOL Universal Series DC Inverter Existing Air Handler in house must be 410 air handler and 410 TXV Bioflow valve Accessory copper 90 pipe Q+y*2 Must install filter drier bi flow with this installation type must have 410 TXV Bioflow valve Purge with Nitrogen Weld joint Air Handler WELD Type Complete Unit Replacement Fig. 2.
Unit Installation Conventional Line Set Installation Pipe Bending 1. Use your hands to bend the pipes. Work carefully to collapse them. 2. Do not bend the pipes in at an angle greater than 90°. 3. If the pipe is repeatedly bent or extended, it will become hard and difficult to manipulate. Avoid bending or extending the pipe for more than 3 times. 4. Do not bend the pipe excessively, otherwise it will break. Refer to Fig. 2.
Unit Installation Conventional Line Set Installation Pipe Connection WARNING 1. Connect the pipe to the unit. Follow all instructions below. Use both spanner and torque wrench. 2. When connecting the tapered screw nut, first apply chilled machine oil on its inner and outer surface and then screw it on 3 or 4 threads. 3. Confirm the tightening torque by referring to the following table. If the screw nut is over-twisted, it may be damaged and cause leakage. 4.
Unit Installation Conventional Line Set Installation Vacuum Lines WARNING Make sure the outlet of the vaccuum pump is away from any potential source of fire and is well-ventilated. 1. Remove the caps on the liquid valve, gas valve and also the service port. 2. Connect the hose at the low pressure side of the manifold valve assembly to the service port of the unit’s gas valve. Meanwhile, the gas and liquid valves should be kept closed to avoid refrigerant leak. 3.
Unit Installation Conventional Line Set Installation Vacuum Lines Pressure gauge (Low-Pressure) Gauge Manifold Pressure Gauge (Hi-Pressure) Switch (Low-Pressure) Switch (Hi-Pressure) Connection Pipe Refrigerant Lines (to indoor unit) Cap Liquid Valve Gas Valve Service Pipe Cap Hose Service Port Hose with the Valve Pin Cap Vacuum Pump Fig. 2.20 Adding Refrigerant Outdoor Unit Model Standard Pipe Length MDUO18024036 24.6 feet | 7.
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 belowⱡ : Connec�ons must be made exactly as specified to avoid system leaks and /or damage 1. Take out matching male connectors M1 and M2. 2.
Unit Installation Installation of Drain Pipe If the outdoor unit is located on a level lower than the indoor unit, arrange the condensate drain according Fig. 2.21. Sealed 1. Drain hose should be placed on the ground and its end should not be immersed into water. 2. The entire lineset, including drain pipe should be wound with insulating tape. Wind the insulating tape from bottom to top. Saddle 3. The entire lineset, including drain pipe should be supported and fixed onto the wall with saddles.
Unit Installation Condenser Field Conversion Converting Unit From 3 Ton 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. DO NOT attempt this conversion while the unit is powered on. 2. Locate the capacity dip switch on the condenser main board. The capacity dip switch is circled on the photo below. 3. The default position of the capacity dip switch is 1 & 2 ‘Up’ and 3 &4 ‘Down’.
Unit Installation Electrical Connection Electrical Regulations WARNING Before performing electrical work, read the following regulations 1. Electrical installation must be conducted only by professionals in compliance with local laws, regulations and this installation manual. Never artificially extend the length of power cord. The electric circuit must be equipped with a circuit breaker and air switch. Both must have sufficient capacity. 2.
Unit Installation Electrical Connection Electrical Parameters Outdoor Unit Model MDUO18024036 Power Supply 208/230V 1Ph - 60Hz Min. Circuit Ampacity Max. Fuse Size 24 amps (3 Ton) 18 amps (2 Ton) 35 amps (3 Ton) 20 amps (2 Ton) Connecting the Power Cord & Communication Wire For solid wires (Refer to Fig. 2.26 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 the terminal board. 3.
Unit Installation Electrical Connection Connecting the Power Cord & Communication Wire WARNING 1. Before work begins, please check to ensure the unit is powered OFF. 2. Improper wire connection may cause electrical components to burn. 3. Connect the wires firmly to the wiring box. Incomplete installation may create a fire hazard. 4. Use wire clamps to secure the external covers of connecting wires. Insulators must be clamped securely; otherwise, electrical leakage may occur. 5.
Unit Installation Electrical Connection Connecting the Power Cord & Communication Wire WARNING 1. High and low voltage wires should be led through different rubber rings of the electric box cover. 2. Do not bundle up the temperature controller wire or lay them side by side, otherwise errors will occur. 3. High and low voltage wires should be secured separately. Secure the former ones with large clamps and the latter ones with small clamps. . 4.
Unit Installation Electrical Connection Connecting the Power Cord & Communication Wire 1. Remove the big handle/front panel of the outdoor unit and insert one end of the communication wire and the power cord to the terminal board. 2. The power cord should be secured along with the right side plate and fixed to the hook with a wire clamp so as to avoid contacting the pipeline. The temperature controller wire should also be laid along with the right side plate but away from the power cord. L1 L2 300V 2.
Refrigerant Piping Connection Post Installation Checks 3 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 flare nut connections and confirm that the system is not leaking • Confirm that gas and liquid (high and low pressure) valves are fully open List of Checks to Perform Possible Malfunctions Is the main body installed securely? The unit may fall
Post Installation Checks Test Run DOUBLE-CHECK PIPE CONNECTIONS During operation, the pressure of the refrigerant circuit will increase. This may reveal leaks that were not present during your initial leak check. Take time during the Test Run to double-check that all refrigerant pipe connection points do not have leaks. Test Run Instructions Preparation before connecting the power: 1. Power must not be connected if the installation work is not completed. 2.
Maintenance Maintenance Outdoor Unit Installation 44 Troubleshooting (1) If your air conditioner fails to function normally, check the following items before conducting maintenance: Problem The air conditioner will not activate. Inadequate cooling or heating performance Page 33 Cause Corrective Measure If you turn off the unit and then immediately turn it on, in order to protect the compressor and avoid system overload, compressor will delay running fo 3 minutes. Please wait for approx. 3 minutes.
Maintenance (2) The following situations are not operation failures. Problem Time of Occurrence Cause If the unit is running under high humidity, the wet air in the room will be quickly cooled down. Mist comes from the During operation. conditioner. The air conditioner generates noise. System switches to heating mode after defrosting. The air conditioner is buzzing when operation begins. When the unit is turned on, it purrs.
Maintenance 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 yourself. Improper repair and maintenance can create electric shock and fire hazards. Please contact MRCOOL Tech Support for further guidance or a qualified professional for repairs.
Maintenance Number Error Code Error 22 P5 Over-current protection 23 P6 Master control and driver communication error 24 25 26 27 P7 P8 P9 PA Driver module sensor error Driver module high temperature protection Zero-crossing protection AC current protection 28 29 30 Pc Pd PE Driver current error Sensor connection protection Temperature drift protection 31 PL Bus low-voltage protection 32 33 34 PH PU PP Bus high-voltage protection Charge loop error Input voltage error 35 ee Driver memor
Maintenance Unit Maintenance Warning 1) Before cleaning, ensure the power is off. Turn off at circuit breaker and remove the power socket, to avoid electric shock. 2) Do not wash the air conditioner with water, otherwise fire or electric shock may occur. 3) When cleaning the filter, be careful. If you need to work above the ground, please exercise caution. Outdoor Heat Exchanger Clean the heat exchanger on the outdoor unit periodically — at least once every two months.
Maintenance Notice on Maintenance Service Information The manual contains specific information for service personnel who will perform maintenance on the product. General Work Area Inform others working in the immediate vicinity about the nature of work being performed. Avoid work confined spaces. Section off the area around the workspace. Ensure conditions within the area are safe by removing potentially flammable material.
Maintenance Electrical Device Checks Initial safety checks should include: 1) Safe discharge of capacitors to avoid the possibility of sparking; 2) No live electrical components and wiring should be exposed while charging, recovering or purging the system; 3) The system is safely grounded. Sealed Component Repairs ELECTRICAL SAFETY Ensure that this system is installed using a disconnect box that meets national, state, and local electrical and HVAC code requirements.
Maintenance Notice on Maintenance Cabling Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse environmental effects. The check should also take into account the effects of ageing or continual vibration from sources such as compressors or fans. Charging Procedures In addition to conventional charging procedures, the following parameters must be followed: 1) Ensure refrigerant contamination does not occur when charging equipment.
Maintenance Notice on Maintenance Decommissioning (cont.) 6) Do not exceed the maximum working pressure of the cylinder, even temporarily. 7) When the cylinders have been filled correctly and the process completed, ensure the cylinders and the equipment are removed from site promptly and all isolation valves on the equipment are closed. 8) Recovered refrigerant must not be charged into another refrigeration system until it has been cleaned and checked.
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 © 2019 MRCOOL, LLC.
