MrCool DIY Series Installation & Owner's Manual
Single-zone mini-split system
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- User manual (60 pages) ,
- Installation & owner's manual (54 pages) ,
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Mini-Split System
INSTALLATION & OWNER'S MANUAL
MODELS:
DIY-*-HP-WMAH-115D25-O
DIY-*-HP-WMAH-230D25-O
DIY-*-HP-C-115D25-O
DIY-*-HP-C-230D25-O
Read this manual carefully before installation and keep it where
the operator can easily find it for future reference.
Due to updates and constantly improving performance, the
information and instructions within this manual are subject to
change without notice.
Version Date: February 26, 2025
Please visit www.mrcool.com/documentation
to ensure you have the latest version of this manual.
This product utilizes R-454B refrigerant
DIY
Series
®
Single-Zone
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Table of Contents
Related Manuals for MrCool DIY Series
Summary of Contents for MrCool DIY Series
- Page 1 Due to updates and constantly improving performance, the information and instructions within this manual are subject to change without notice. Version Date: February 26, 2025 Please visit www.mrcool.com/documentation to ensure you have the latest version of this manual.
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Page 2: Table Of Contents
To return your used device, please use the return and collection systems or contact the retailer where the product was purchased. They can take this product for environmental safe recycling. mrcool.com... -
Page 3: Safety
The unit’s circuit board (PCB) is designed with a fuse to provide over-current protection. • The specifications of the fuse are printed on the circuit board, examples of such are T5A/250VAC and T10A/250VAC. Note: Only a blast-proof ceramic fuse can be used. mrcool.com... -
Page 4: Electrical Warnings
Call your local dealer, or MRCOOL® tech support at (270) 366-0457, for further assistance. 2. If the air conditioner is used together with burners or other heating devices, thoroughly ventilate the room in order to avoid an oxygen deficiency. - Page 5 • Protection devices, piping and fittings must be protected as much as possible against adverse environmental effects. For example, against the danger of water collecting and freezing in relief pipes or against accumulation of dirt or debris. mrcool.com...
- Page 6 mrcool.com...
- Page 7 • Ensure that contamination of different refrigerants does not occur when using charging equipment. Hoses or lines shall be as short as possible to minimize the amount of refrigerant contained in them. mrcool.com...
- Page 8 37. An unventilated area where the appliance using flammable refrigerants is installed should be constructed so that should any refrigerant leak, it will nto stagnate so as to create a fire or explosion hazard. If appliances connected via an air duct system to one or more rooms below the ventilation requirements, mrcool.com...
- Page 9 0.25 times the maximum allowable pressure. No leak should be detected. • Any servicing should be performed only as recommended by MRCOOL®. 43. Any maintenance, service, or repair operations must be performed by qualified personnel. Every working procedure that affects safety should only be carried out by competent persons that are both trained and certified.
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Page 10: Unit Overview
Drain Pipe Sleeve Sound- Anchor Absorbent Pads 5-8 each (Packaged Together) Mounting Plate Seal Fixing Screw Smart Drain Joint Controller Kit Plastic Wall DIYPRO Cable ® Sleeve & Cap Quick Connect® Line Small Filter Neoprene Allen Wrench Non-Adhesive Tape mrcool.com... -
Page 11: Indoor Unit Display
(for 3 seconds) • TIMER OFF is set. • SWING, TURBO or SILENCE feature is turned off. (for 3 seconds) • When defrosting. • When Active Clean feature is turned on. • When 46 F(8 C) heating feature is turned on. mrcool.com... -
Page 12: Additional Functions
When the unit is turned off, a 10 second delay occurs then the outdoor fan runs in reverse rotation for 70 seconds. This will blow off loose accumulated dust and debris. mrcool.com... -
Page 13: Setting Angle Of Airflow
The horizontal angle of the airflow can also be set by remote control. (Refer to the Remote Control Manual for instructions.) CAUTION DO NOT put your fingers in or near the blower and suction side of the unit. The high-speed fan inside the unit may cause injury. mrcool.com... -
Page 14: Manual Operation
4. Close the carton and seal it with packing tape. 1. Cut the packing belt. 5. Use the packing belt, if necessary. 2. Take the unit out of the carton. 3. Remove the foam from the unit. 4. Remove the packaging bag from the unit. mrcool.com... -
Page 15: Indoor Unit Installation
5. Drain Pipe (purchase separately) 9. Remote Control Holder 2. Front Panel 6. Connection Cable (purchase (purchase separately) separately). 3. Louver 10. Outdoor Unit Power Cable 7. Refrigerant Piping (purchase 4. Air Filter separately). (purchase separately) Tools NOT Included: mrcool.com... -
Page 16: Installation Summary
INDOOR UNIT INSTALLATION 3.2 Installation Summary mrcool.com... - Page 17 INDOOR UNIT INSTALLATION mrcool.com...
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Page 18: Installation Location
When choosing a location, be aware that you should leave ample room for a wall hole (see steps for drilling a wall hole for connecting piping) for the signal cable and refrigerant piping that connect the indoor and outdoor units. The default position for all piping is the right side of the indoor unit (when facing the unit). mrcool.com... - Page 19 When the unit detects a refrigerant leak, the minimum airflow of the indoor unit is as follows: Model Indoor Unit Outdoor Unit Indoor Normal Air Volume 9K (115V) DIY-09-HP-WMAH-115D25-O DIY-09-HP-C-115D25-O 540m 318CFM 12K (115V) DIY-12-HP-WMAH-115D25-O DIY-12-HP-C-115D25-O 540m 318CFM DIY-18-HP-WMAH-230D25-O DIY-18-HP-C-230D25-O 800m 470CFM DIY-24-HP-WMAH-230D25-O DIY-24-HP-C-230D25-O 1000m 588CFM DIY-36-HP-WMAH-230D25-O DIY-36-HP-C-230D25-O 1000m 588CFM mrcool.com...
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Page 20: Drilling Wall Opening
When the pipe size of the gas side is Φ5/8in (Φ16mm) or more, the wall hole should be Φ3.54in (Φ90mm). When the pipe size of the gas side is less than Φ5/8in (Φ16mm), the wall hole should be Φ2.5in (Φ65mm). mrcool.com... - Page 21 Step 2: Place the protective wall cuff in the hole. This protects the edges of the hole and will help seal it when you finish the installation process. mrcool.com...
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Page 22: Refrigerant Pipe & Drain Hose Installation
• 1 open-ended spanner, 24mm/27mm line connectors yourself, it is imperative that • 1 Allen Key, 5mm you contact MRCOOL® customer service or a • 1 Philips Screwdriver refrigeration contractor. • 1 leak detection spray or water/soap mixture... - Page 23 After connecting the quick connectors, pass the drain hose and refrigerant pipes through the wall hole. NOTE: The quick connector parts must be located outside of the room. Use the wall hole sleeve, cap, and neoprene to seal the wall hole. mrcool.com...
- Page 24 For the exposed portion on the top, use the supplied white insulation material to wrap it up completely. Step 8: Finally, use the tape to wrap the refrigerant pipe and drain hose together. The cable should be protected by an applicable conduit. mrcool.com...
- Page 25 For the portion of the drain hose that will remain indoors, wrap it with foam pipe insulation to prevent condensation. • Remove the air filter and pour a small amount of water into the drain pan to ensure the water flows from the unit smoothly. mrcool.com...
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Page 26: Electrical Wiring
4. As shown in the illustration, insert the wires including the ground wire into the conduit and DO NOT MIX LIVE AND NULL WIRES. secure them with a lock nut onto the conduit This is dangerous, and can cause the unit to mounting plate. malfunction. mrcool.com... -
Page 27: Wrap Piping & Cables
DO NOT WRAP ENDS OF PIPING When wrapping the bundle, keep the ends of the piping unwrapped. You need to access them to test for leaks at the end of the installation process. mrcool.com... -
Page 28: Mount Indoor Unit
6. Remove the bracket or wedge that is propping up the unit. 7. Using even pressure, push down on the bottom half of the unit. Keep pushing down until the unit snaps onto the hooks along the bottom of the mounting plate. mrcool.com... - Page 29 2. Keep pressing the cross-shape part of connector B with a tool for approximately 5-10 seconds until the red protruding point of Connector A retracts completely. 3. Remove connectors A and B, then perform the refrigerant piping connection between the indoor unit and the outdoor unit. mrcool.com...
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Page 30: Outdoor Unit Installation
ǿ Near a public street, crowded areas, or where noise from the unit will disturb others. ǿ Near any source of combustible gas. ǿ In a location exposed to excessive amounts of salty air. ǿ In a location exposed to large amounts of dust. mrcool.com... -
Page 31: Drain Joint Installation
Connect a drain hose extension (not included) to the drain joint to redirect water from the unit during heating mode. NOTE: In cold climates, ensure that the drain hose is as vertical as possible to ensure swift water drainage. If water drains too slowly, it can freeze in the hose and flood the unit. mrcool.com... -
Page 32: Anchor Outdoor Unit
CAUTION: SPECIAL CONSIDERATIONS FOR EXTREME WEATHER Make sure that the wall is made of solid brick, concrete, or of similarly strong material. The wall must be able to support at least four times the unit's weight. mrcool.com... -
Page 33: Signal & Power Cable Connection
2. Connect the sheathed wire by first turning the ring counterclockwise to remove. 3. Pass through the hole in the metal panel. 4. Reinstall the ring and tighten it by turning clockwise. 5. Replace the wire cover on the side of the unit, and screw it in place. mrcool.com... -
Page 34: Refrigerant Piping Connection
NOTE: The refrigerant pipes must be connected to the valves on the outdoor unit with as little stress as possible. WARNING Before connecting the pipes, ensure that the quick connectors are tightened. Before you continue, it is essential that you read the following instructions carefully. mrcool.com... - Page 35 (adjustable-type) wrench. Then, insert a 5 mm Allen key and open the valve by turning it counter- clockwise as far as it will go. DO NOT force it. The valve is now open. Screw the cover back onto the top valve and tighten it well to ensure that it is properly sealed. mrcool.com...
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Page 36: Post-Installation
AFTER PERFORMING GAS LEAK CHECKS: After confirming that all of the pipe connection points do not A: Low Pressure Stop Valve leak, replace the valve cover on the outside unit. B: High Pressure Stop Valve C & D: Indoor Unit Flare Nuts mrcool.com... -
Page 37: Test Run
All pipe connection points do not leak Water drains properly from drain hose All piping is properly insulated Unit performs cool function properly Unit performs heat function properly Indoor unit louvers rotate properly Indoor unit responds to remote control mrcool.com... -
Page 38: Care & Maintenance
Step 3: If your filter has a small air freshening filter, unclip it from the larger filter. Clean this air freshening filter with a hand-held vacuum. 1. Flip to back 2. Remove air 3. Clean with freshening filter hand-held vacuum mrcool.com... -
Page 39: Maintaining The Unit
Clean all filters. Clean all filters. until unit dries out wires. completely. Check for leaks. Replace batteries. Turn off the unit & Remove batteries disconnect the power. from remote control. Ensure nothing is blocking the air inlets & outlets. mrcool.com... -
Page 40: Troubleshooting
Disconnect the power, then reconnect. • Press the ON/OFF button on the remote control to restart operation. MRCOOL® Note: If a problem persists, contact a local dealer or customer service. Provide them with a detailed description of the unit malfunction as well as your model number. - Page 41 10 minutes. The problem may resolve itself. the following letters in the If not, disconnect the power, then connect it again. Turn the unit on. If the problem persists, display area: MRCOOL® disconnect the power and contact E(x), P(x), F(x), EH(xx), EL(xx), EC(xx), PH(xx), PL(xx), PC(xx) Note: If the problem persists after performing the checks and diagnostics above, turn off the unit immediately and contact MRCOOL®...
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Page 42: Error Display (Indoor Unit)
Test the unit using the remote control. If the unit does undefined by the service manual. Ensure that this not respond to the remote, the indoor PCB requires code is not a temperature reading. replacement. If the unit responds, the display board requires replacement. mrcool.com... -
Page 43: Error Display (Outdoor Unit With Auxiliary Board)
ODU Ambient Temperature Sensor (T4) Error TS05-ODU EC 53 Comp. Discharge Temperature Sensor (TP) Error TS05-ODU EC 54 Open or Short Circuit of Outdoor Unit Temperature Sensor (T3, T4, TP) TS05-ODU EC 50 Low Ambient Temperature Protection PC 0l mrcool.com... -
Page 44: Quick Maintenance By Error Code
√ √ √ √ Outdoor Fan Motor √ T3 Sensor √ T4 Sensor √ TP Sensor √ Reactor √ √ Compressor √ √ √ √ IPM Module Board √ High Pressure Protector √ Low Pressure Protector √ Additional Refrigerant mrcool.com... - Page 45 √ √ √ √ Outdoor PCB √ Outdoor Fan Motor T3 Sensor TP Sensor Pressure Sensor √ Reactor √ Compressor √ IPM Module Board High Pressure Valve Assembly √ High Pressure Protector √ Low Pressure Protector √ Additional Refrigerant mrcool.com...
- Page 46 Series ® Single-Zone Mini-Split System 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.
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