MrCool DIY Series Installation & Owner's Manual
Multi-zone mini-split system
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DIY
®
Mini-Split System
INSTALLATION & OWNER'S MANUAL
MODELS:
DIY-**-HP-WMAH-230D25-O
DIY-MULTI*-**HP230D-O
DIYCASSETTE**HP-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: January 24, 2025
Please visit www.mrcool.com/documentation
to ensure you have the latest version of this manual.
This product utilizes R-454B refrigerant
Series Multi-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: January 24, 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
7.3 Test Run ......................42 7.4 Manual Operation ..................... 43 7.5 Care & Maintenance ..................44 7.6 Troubleshooting ....................46 7.7 Error Display (Indoor Unit) ................48 7.8 Outdoor Unit Point Check Function ..............49 7.9 Quick Maintenance by Error Code ..............51 mrcool.com... -
Page 3: Safety Precautions
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 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 39. An unventilated area where the appliance using flammable refrigerants is installed should be constructed so that should any refrigerant leak, it will not 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®. 46. 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
(To be installed on the back of the main air filter by an authorized technician during installation.) Quick Connect Line Set ® ® Neoprene (wall sleeve sealant) / 1- liquid side adapter suction side adapter Line Set Adapter Set (used for installing units rated 24K or greater.) Allen Wrench mrcool.com... -
Page 11: Specifications
24/7.5 24/7.5 24/7.5 When installing multiple indoor units with a single outdoor unit, ensure that the length of the refrigerant pipe and the drop height between the indoor and outdoor units meet the requirements illustrated in the following diagram: mrcool.com... -
Page 12: Product Overview
3. Hanging Bracket Air Filter (Behind) 13. Fan Hood 10. Fan Hood 4. Display Panel 5. Horizontal Louver 5. Drain Pipe 6. LCD Display Window 6. Remote Control 7. Vertical Louver 8. Manual Control Button (Behind) 9. Remote Control mrcool.com... -
Page 13: Operating Conditions
When your unit is used outside of the following temperature ranges, certain safety protection features may activate and cause the unit to disable. Cool Mode Heat Mode Dry Mode Room Temperature 60°F-90°F (16°C-90°C) 32°F-86°F (0°C-30°C) 50°F-90°F (10°C-32°C) -13°F-122°F (-25°C-50°C) -13°F-75°F (-25°C-24°C) Outdoor Temperature 32°F-122°F (0°C-50°C) -22°F-122°F (-30°C-50°C) -22°F-75°F (-22°F-75°F) mrcool.com... -
Page 14: Parts Overview
The installation must be performed in accordance with the requirements of local and national standards. The installation may be slightly different in different areas. DIYPRO Cable ® NOTE Illustrations in this manual are for explanatory purposes. The actual shape of your unit may vary. mrcool.com... -
Page 15: Packing & Unpacking The Unit
SWING, TURBO or SILENCE feature is turned on. • TIMER OFF is set. (for 3 seconds) • SWING, TURBO or SILENCE feature is turned off. • When defrosting. • When Active Clean feature is turned on. • When 46°F (8°C) heating feature is turned on. mrcool.com... -
Page 16: Installation Diagram
Copper lines must be independently insulated. NOTE The installation must be performed in accordance with More than More than 11.8in (30cm) the requirement of local and national standards. The 11.8in (30cm) installation may be slightly different in different areas. More than 23.6in (60cm) mrcool.com... -
Page 17: Indoor Unit Installation
9. Remote Control Holder 6. Connection Cable 2. Front Panel 10. Outdoor Unit Power Cable 3. Louver 7. Refrigerant Piping 4. Air Filter Tools NOT Included: Goggles & Vinyl Tape Gloves Screwdriver & Hammer Core Drill Masks Wrench Drill mrcool.com... -
Page 18: Installation Location
91.7/2.6 86/7.99 155.2/4.4 145/13.51 inst the floor of the room after installation. 98.8/2.8 93/8.6 162.2/4.6 152/14.13 105.8/3.0 99/9.21 169.3/4.8 159/14.74 112.9/3.2 106/9.83 176.4/5.0 165/15.36 mrcool.com... - Page 19 204g, and you will get the total releasable charge of the system. Note: The calculation is based on the standard connection pipe length of 24.6ft (7.5m) for each indoor unit. An extra releasable charge should be added per meter exceeding 24.6ft (7.5m). mrcool.com...
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Page 20: Attach Mounting Plate
If the wall is made of brick, concrete, or similar material, drill 0.2in-diameter (5mm-diameter) holes in the wall and insert the sleeve anchors provided. Then, secure the mounting plate to the wall by tightening the screws directly into the clip anchors. mrcool.com... -
Page 21: Drill Wall Hole
If you find that you don't have ample room to connect embedded pipes to the indoor unit, the unit can be adjusted left or right by approximately 1.18-1.96in (30-50mm), depending on the model. mrcool.com... -
Page 22: Prepare Refrigerant Piping
DRAIN HOSE MUST BE ON BOTTOM: The drain hose must be places at the bottom of the bundle. If it is not, it could cause the drain pan to overflow, which could lead to fire or water damage. mrcool.com... -
Page 23: Outdoor Unit Installation
; Where snowfall is anticipated, Installation requirements above. prolonged periods of take appropriate measures to direct sunlight or rain. prevent ice buildup & coil damage. NOTE: Install the unit by following local codes and regulations. These may differ slightly between different regions. mrcool.com... -
Page 24: Drain Joint Installation
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 25: Anchor Outdoor Unit
Rows of Series Installation The relations between H, A, and L are as follows: L ≤ 1/2H 9.8in (250mm) or more L ≤ H 1/2H < L ≤ H 11.8in (300mm) or more L > H Cannot be installed mrcool.com... -
Page 26: For Maximum Performance
To distinguish the connectors to be connected to the indoor units and outdoor unit, the refrigerant pipe connectors have been labeled "A", "B", "C", "D", and "E". Ensure the marks on the connectors match the indoor units and outdoor unit respectively during connection. mrcool.com... -
Page 27: Refrigerant Piping Connection
Step 3: Pack the wall hole with the supplied neoprene (or spray foam can also be used) to seal the hole, filling any space that was not taken up by the refrigerant piping and lines. mrcool.com... -
Page 28: Connect Line Set To Indoor Unit
24K & 36K confident connecting the line set connectors yourself, Or 2x • 3/4" (19mm) • 3/4" (19mm) it is imperative that you contact the MRCOOL® Crescent • 7/8" (22mm) • 15/16" (24mm) customer service team or an HVAC professional. - Page 29 (based on pipe/coupling size). *If an HVAC torque wrench is NOT available: Using two wrenches you used to tighten the connector, once the connector is snug, turn the wrench slightly beyond that point to torque the connector, but do not overtighten it. mrcool.com...
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Page 30: Connect Line Set To Outdoor Unit
NOTE: Ensure the adapters attached to the once the connector is snug, turn the wrench slightly outdoor valves have been tightened properly beyond that point to torque the connector but do not before attempting to connect the line set. overtighten it. mrcool.com... - Page 31 IMPORTANT: Later in the installation process you will be asked to check for leaks at the piping connections. Be sure to include checking these adapters at both ends during your check. mrcool.com...
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Page 32: Opening Refrigerant Valves
DO NOT force it. Then, reinstall the caps and tighten them securely to ensure that they are properly sealed. CAUTION If the King Valves are not fully opened, the system could malfunction and suffer damage. mrcool.com... -
Page 33: Wrap Piping Connections
The drain pipe 1. Wrap the supplied insulation material over the will need to be at the bottom of the bundle. DO connectors and exposed refrigerant piping. NOT wrap the end of the drain hose. mrcool.com... -
Page 34: Connect Drain Pipe
Make sure to arrange the drain hose correctly according to the following images. • DO NOT kink the drain hose. • DO NOT create a water trap. • DO NOT put the end of the drain hose in water or a container that will collect water. mrcool.com... -
Page 35: Electrical Wiring
1/8in. (3mm) must reasoning to the client, and refuse to install the unit be incorporated in the fixed wiring. The qualified until the safety issue has been resolved properly. technician must use an approved circuit breaker or switch. mrcool.com... -
Page 36: Outdoor Unit Wiring
4. Clamp down the cable with the cable clamp. 5. Insulate unused wires with electrical tape. Keep them away from any electrical or metal parts. 6. Reinstall the cover of the electric control box. mrcool.com... - Page 37 Run the main power cord through the lower line- outlet of the cord clamp. This symbol ---- indicates field wiring. 3-Zone Models: 4-Zone Models: 5-Zone Models: Wiring Diagram: 6-Zone Models: Wire Identification Number Color White Black mrcool.com...
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Page 38: Air Switch
When the maximum current of the unit is more than 16A, an air switch or leakage protection switch with protective device shall be used (purchased separately). When the maximum current of the unit is less than 16A, the power cord of the air conditioner should be equipped with a plug. Systems in the North American market should be wired according to NEC and CEC requirements and regulations. Please refer to the different air switch wiring diagrams below. mrcool.com... -
Page 39: Diypro ® Cable Connection
ELECTRICAL WIRING Note: The diagrams above are for illustration/reference purposes only. 6.4 DIYPRO Cable Connection ® 1. Remove the screws from the electrical wiring cover from the outdoor condenser, as shown in the image below, and remove it. mrcool.com... - Page 40 Minimum Wire Gauge for Power Cables Appliance Amps (A) Model Series Min. Pref. 6. Finally, reinstall the electrical wiring cover and secure it by reinstalling the screws you previously removed. WARNING ALL WIRING MUST BE INSTALLED STRICTLY IN ACCORDANCE WITH THE WIRING DIAGRAM. mrcool.com...
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Page 41: Automatic Wiring/Piping Connection
2. Check that the stop valves of the liquid pipe and gas pipe are open. 3. Turn on the breaker and wait at least 2 minutes. 4. Press and hold the check switch on the outdoor PCB board unit until the LED displays "CE". mrcool.com... -
Page 42: Post-Installation
• Charging with unsuitable substances may cause explosions or accidents. Ensure that the appropriate refrigerant is used. • Refrigerant containers must be opened slowly. Always use protective gear when charging the system. • DO NOT mix refrigerant types. mrcool.com... -
Page 43: Test Run
The length of the piping and additional refrigerant stow capacity have been recorded. The power voltage is the correct voltage for the unit. The wall hole sleeve is packed airtight. Ensure all connection valves and King valves on the outdoor condenser are fully opened. mrcool.com... -
Page 44: Manual Operation
(for units without a display window). Alternatively, the defrost and alarm indication light (if applicable) will light up, or the operation indication light will flash rapidly, and the timer indication light will turn off. mrcool.com... -
Page 45: Care & Maintenance
Shake off the excess water and allow it to dry in a cool area. 6. Re-clip the small air freshening filter into the large air filter by reversing step 4. mrcool.com... -
Page 46: Pre-Season Inspection
4. Remove the batteries from the remote control. 5. The outdoor unit also requires periodic maintenance. However, it is highly recommended you contact a qualified service professional to perform this. Please do not attempt to do this on your own. mrcool.com... -
Page 47: Troubleshooting
The fan of the outdoor unit During operation, the fan speed is controlled to optimize product operation. does not operate. 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 48 Call a technician to check for leaks, re-seal if necessary, term use. and top off refrigerant. Note: If your problem persists after performing the checks and diagnostics above, turn off your unit immediately and contact a local dealer or MRCOOL customer service. ® mrcool.com...
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Page 49: Error Display (Indoor Unit)
Test the unit using the remote control. If the unit does not respond to the remote, by the service manual. Ensure that this code is not a temperature the indoor PCB requires replacement. If the unit responds, the display board reading. requires replacement. mrcool.com... -
Page 50: Outdoor Unit Point Check Function
"30". If the temperature is higher than 48°F (99°C), the digital Compressor Discharge Temperature (TP) display shows single and double digits. For example, if the display shows 0.5: 0.5 is multiplied by 10 to become 5, then added to 100 to become 221°F (105°C). mrcool.com... - Page 51 5, then added to 100 to become 221°F (105°C) The capacity unit is horse power. If the indoor unit is now connected, the Indoor Unit F Capacity digital display shows the following: "--" Indoor Unit F Capacity Demand Code Norm Code*HP (9K: 1HP, 12K: 1.2HP, 18K: 1.5HP) mrcool.com...
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Page 52: Quick Maintenance By Error Code
COMP. Discharge Temperature Sensor √ √ √ IPM Module Temperature Sensor IDU Coil Outlet Temperature Sensor √ Refrigerant Pipe Temperature Sensor √ Enthalpy Inlet Temperature Sensor √ √ Enthalpy Outlet Temperature Sensor Condenser Temperature Sensor √ Reactor √ √ IPM Module Board mrcool.com... - Page 53 To prevent possible harm to the environment or human health from uncontrolled waste disposal, recycle it responsibly to promote the sustainable reuse of material resources. 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 54 Series ® Multi-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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