MRCOOL Olympus Multi-Zone 4th Gen — Ceiling Cassette System (Professional Installation)
MRCOOL Olympus 4th Generation 4-Zone Ductless Mini Split AC & Heat Pump 36000 BTU (9K+9K+9K+18K), Ceiling Cassette Units, 230V
A space-saving ceiling cassette solution with a clean, flush look, quiet operation, and multi-zone comfort for up to six rooms.
Overview
36000 BTU
4 Zones
24 SEER2
Operates to -13°F
R-454B
SmartHVAC App
Alexa & Google
Ceiling Cassette
Quiet Operation
Designed to fit seamlessly into the ceiling for a flush look, Olympus ceiling cassettes help free up wall space while delivering efficient, even comfort. Multi-zone systems run in one mode at a time (the system heats or cools as a whole).
System Combination
MULTI5-36HP230C-O + 3X CASSETTE09HP-230C-P-O + CASSETTE18HP-230C-P-O
MULTI5-36HP230C-O + 3X CASSETTE09HP-230C-P-O + CASSETTE18HP-230C-P-O
Outdoor Model
MULTI5-36HP230C-O
MULTI5-36HP230C-O
Min Circuit Ampacity
30.5
30.5
Max Fuse / Breaker
35
35
Why Homeowners Love It
- Clean, modern aesthetic: Ceiling-mounted design delivers a discreet, flush appearance that blends into the room.
- Save wall space: Ideal when wall space is limited or you prefer an uncluttered layout.
- Quiet comfort: Designed for low-noise operation—great for bedrooms, offices, and nurseries.
- Multi-zone control: Flexible zone-by-zone comfort for up to six areas with one outdoor unit.
- Smart control: Manage schedules and setpoints using SmartHVAC app plus Alexa/Google voice control.
Important: This system is not DIY—professional installation is required.
What’s Included
- (1) Outdoor condenser: MULTI5-36HP230C-O
- Indoor ceiling cassettes:
- 9,000 BTU (x3) — Model: CASSETTE09HP-230C-P-O
- 18,000 BTU (x1) — Model: CASSETTE18HP-230C-P-O
- Zone remotes/controllers (model-specific)
- Refrigerant line sets & interconnect/communication wiring (must be selected in the options to be included; choose the appropriate length for each indoor unit based on your layout)
- Mounting/ceiling hardware (model-specific)
- Installation documentation (see Documents & Downloads)
Mrcool DIY Multi-Zones
Key Features
- Space-saving ceiling design: Flush look that maximizes usable wall space.
- Advanced inverter efficiency: High performance with strong SEER2 ratings (varies by model pairing).
- Low-ambient cooling capability: Suitable for specialty cooling needs in colder weather (application dependent).
- Refrigerant leak detection: Built-in monitoring with fault indication to help protect the system.
- Gold Fin® condenser: Added corrosion resistance for long-term durability.
- SmartHVAC control: App scheduling + remote access, plus Alexa/Google voice integration.
R-454B is an A2L refrigerant. Installation/service must follow the manufacturer manual and applicable codes.
Comfort Modes
- Auto: Automatically selects heating or cooling to maintain setpoint.
- Cool / Heat: Dedicated modes for seasonal comfort.
- Dry: Dehumidifies while maintaining comfort.
- Sleep: Energy-saving overnight profile.
- Timer: Scheduled on/off for efficiency.
Multi-zone systems operate in one mode at a time—you can’t heat one room while cooling another.
Warranty
Standard coverage commonly includes a 7-year compressor warranty and a 5-year parts warranty (registration requirements apply).
Extended limited lifetime replacement coverage may require MRCOOL® Care Kit enrollment and additional conditions/fees. Some extended program terms may exclude certain indoor types—confirm program details for ceiling cassette configurations.
Indoor Specs
Indoor Unit Specifications — CASSETTE09HP-230C-P-O
| brand name | MRCOOL |
|---|---|
| series | Olympus Cassette |
| model | CASSETTE09HP-230C-P-O |
| unit type | Mini-Split |
| short description | Olympus 9,000 BTU 3/4 Ton Ductless Mini-Split Ceiling Cassette with Panel - 230V/60Hz |
| long description | The MRCOOL® OLYMPUS 9K CASSETTE provides dependable heating and cooling for spaces up to 400 square feet, making it perfect for bedrooms, home offices, and smaller areas. Designed to fit seamlessly into the ceiling for a flush look, it almost disappears, creating a clean, modern aesthetic that complements any room style. Its versatile design is perfect for homes or businesses looking to maximize space while maintaining an elegant, high-performance climate solution. The indoor fan operates at a quiet 42 dB, ensuring a peaceful environment without compromising performance. This ultra-low noise level means you can enjoy consistent, efficient heating or cooling without disruptive fan sounds, ideal for spaces where silence is crucial, like bedrooms, offices, or nurseries. The quiet operation helps enhance the overall comfort of your space, providing a relaxing atmosphere free from distractions. The unit uses R-454B refrigerant, an eco-friendly solution that provides top-tier performance while being environmentally responsible. With low global warming potential, R-454B helps reduce the environmental impact of your system, contributing to a greener, more sustainable home, without sacrificing performance or efficiency. This refrigerant is an important choice for homeowners seeking to lower their carbon footprint while still enjoying reliable performance. The MRCOOL® OLYMPUS 9K CASSETTE comes with a limited lifetime warranty, 7-year compressor coverage, and a 5-year parts warranty, ensuring reliability, cutting-edge technology, and peace of mind. This unit is the ideal solution for homeowners who value efficiency, comfort, and modern design. |
| works with | O-ES-09-HP-C-230C-O1 MULTI3-18HP230C-O MULTI4-27HP230C-O MULTI5-36HP230C-O MULTI6-48HP230C-O |
| tonnage | 0.75 |
| voltage (v) | 208/230 |
| phase | 1 |
| cycle (hz) | 60 |
| max fuse breaker (a) | 15 |
| min circuit ampacity (a) | 3.0 |
| mount type | Ceiling |
| color | White |
| max coverage area | Up to 400 |
| refrigerant type | R-454B |
| decibel rating (dba) | 42.5/40/37.5/26/24 |
| decibel rating low (dba) | 24.0 |
| decibel rating high (dba) | 42.5 |
| air flow direction | Downflow |
| number of speeds | 5 (Variable) |
| oscillation | Yes |
| lineset fitting type | Flare |
| liquid line size | 1/4 |
| suction line size | 3/8 |
| blower motor speeds | 353.2/312/264.9/182.5/147.2 |
| blower motor rpm | 600/530/380 |
| filter type | Reusable |
| auxiliary heater included | No |
| auxiliary heater available | No |
| fan only option | Yes |
| sleep mode | Yes |
| auto cool | Yes |
| wifi compatibility | No |
| app compatibility | No |
| works with ios | No |
| works with android | No |
| remote control included | Yes |
| ul listed | Yes |
| csa listed | Yes |
| etl listed | Yes |
| base warranty | 5-Year Parts |
| base parts warranty | 5-Year |
| base remote warranty | 5 Year |
| registered labor warranty | None |
| base labor warranty | None |
| has batteries | Yes |
| contains electronics | Yes |
| contains chemicals | Yes |
| contains compressed gas | Yes |
| proposition 65 warning | Yes |
| restricted states | GU, PR, VI |
| net depth (in) | 22.44 |
| net height (in) | 9.65 |
| net width (in) | 22.44 |
| net weight | 35.27 |
| gross weight (lbs) | 41.89 |
Indoor Unit Specifications — CASSETTE18HP-230C-P-O
| brand name | MRCOOL |
|---|---|
| series | Olympus Cassette |
| model | CASSETTE18HP-230C-P-O |
| unit type | Mini-Split |
| short description | Olympus 18,000 BTU 1.5 Ton Ductless Mini-Split Ceiling Cassette with Panel - 230V/60Hz |
| long description | The MRCOOL® OLYMPUS 18K CASSETTE provides efficient heating and cooling for areas up to 800 square feet, making it an ideal solution for bedrooms, home offices, or smaller spaces. Its ceiling-mounted design ensures a flush installation, seamlessly blending into your room and creating a sleek, contemporary appearance that enhances any interior style. This adaptable system is perfect for both residential and commercial applications, maximizing space while offering a practical and stylish climate control option. Operating at a quiet 48 dB, the indoor fan maintains a peaceful environment while delivering reliable performance. The low noise level ensures that heating or cooling is achieved without unnecessary distractions, making it perfect for quiet spaces like bedrooms, offices, or nurseries. Its unobtrusive operation fosters a relaxing atmosphere that supports both comfort and productivity. The unit utilizes R-454B refrigerant, an eco-friendly choice that combines exceptional performance with environmental sustainability. With its low global warming potential, R-454B helps reduce the environmental footprint of your system while still providing optimal energy efficiency. This makes it an excellent choice for homeowners who want to minimize their impact on the environment while enjoying consistent, high-quality performance. The MRCOOL® OLYMPUS 18K CASSETTE is backed by a limited lifetime warranty, 7-year compressor coverage, and a 5-year parts warranty, ensuring reliable operation and innovative technology. This unit is the perfect choice for those who value energy efficiency, modern design, and superior comfort. |
| works with | O-ES-18-HP-C-230C-O1 MULTI4-27HP230C-O MULTI5-36HP230C-O MULTI6-48HP230C-O |
| tonnage | 1.5 |
| voltage (v) | 208/230 |
| phase | 1 |
| cycle (hz) | 60 |
| max fuse breaker (a) | 15 |
| min circuit ampacity (a) | 3.0 |
| mount type | Ceiling |
| color | White |
| max coverage area | Up to 800 |
| refrigerant type | R-454B |
| decibel rating (dba) | 48/44.5/41/27.5/23.5 |
| decibel rating low (dba) | 23.5 |
| decibel rating high (dba) | 48.0 |
| air flow direction | Downflow |
| number of speeds | 5 (Variable) |
| oscillation | Yes |
| lineset fitting type | Flare |
| liquid line size | 1/4 |
| suction line size | 1/2 |
| blower motor speeds | 447.3/338.5/317.8/194.2/147.2 |
| blower motor rpm | 800/750/700 |
| filter type | Reusable |
| auxiliary heater included | No |
| auxiliary heater available | No |
| fan only option | Yes |
| sleep mode | Yes |
| auto cool | Yes |
| wifi compatibility | No |
| app compatibility | No |
| works with ios | No |
| works with android | No |
| remote control included | Yes |
| ul listed | Yes |
| csa listed | Yes |
| etl listed | Yes |
| base warranty | 5-Year Parts |
| base parts warranty | 5-Year |
| base remote warranty | 5 Year |
| registered labor warranty | None |
| base labor warranty | None |
| has batteries | Yes |
| contains electronics | Yes |
| contains chemicals | Yes |
| contains compressed gas | Yes |
| proposition 65 warning | Yes |
| restricted states | GU, PR, VI |
| net depth (in) | 22.44 |
| net height (in) | 9.65 |
| net width (in) | 22.44 |
| net weight | 35.27 |
| gross weight (lbs) | 41.89 |
Manuals
- https://doxrepo.mrcool.com/mc-oly-mz-4g-cass-im-um-en-01.pdf
- https://doxrepo.mrcool.com/mc-oly-mz-4g-cass-sm-en-01.pdf
Submittals
Documents
Warranty
Outdoor Specs
Outdoor Unit Specifications — MULTI5-36HP230C-O
| brand name | MRCOOL |
|---|---|
| series | Olympus 4th Gen Multi-Zone Condensers |
| model | MULTI5-36HP230C-O |
| unit type | Mini-Split |
| short description | Olympus 36,000 BTU Mini-Split Condenser - 230V/60Hz |
| long description | The MRCOOL® Olympus 36,000 BTU multi-zone heat pump condenser is a high-capacity, heat pump condenser built to power up to five indoor units simultaneously. Designed for homeowners who want efficient and individualized temperature control across multiple rooms, this ductless system delivers tailored comfort to every zone—making it an excellent fit for modern, multi-room living spaces. Featuring cutting-edge inverter technology, the system provides exceptional energy performance, with SEER2 ratings up to 24 and HSPF2-4 up to 9.5. It operates reliably even in extreme outdoor conditions, functioning in temperatures as low as 5°F to keep your home comfortable year-round. Compatibility with a variety of MRCOOL indoor units—including wall-mounted, ceiling cassette, and concealed duct options—means it’s easy to customize the setup to suit your home’s layout and aesthetic. Smart control options enhance everyday convenience, offering seamless operation through the MRCOOL SmartHVAC app, included remote control, or voice commands via Amazon Alexa and Google Assistant. Additional features like sleep mode, auto restart, and built-in refrigerant leak detection further improve safety, energy efficiency, and peace of mind. Backed by a 7-year limited warranty on the compressor and a 5-year parts warranty (when installed by a professional), the MRCOOL® Olympus MULTI5-36HP230C-O is a reliable, energy-efficient choice for those looking to achieve flexible, zone-specific heating and cooling throughout their home. |
| works with | O-09-HP-WMAH-230C-O DUCT-09HP-230B-O CASSETTE09HP-230C-O O-12-HP-WMAH-230C-O DUCT-12HP-230B-O CASSETTE12HP-230C-O O-18-HP-WMAH-230C-O DUCT-18-HP-230B-O CASSETTE18HP-230C-O O-24-HP-WMAH-230C-O DUCT-24HP-230B-O CASSETTE24HP-230C-O |
| feature list | Installation by a licensed professional required where applicable 7-Year Compresser, 5-Year Parts warranty when registered and installed by a licensed professional R-454B environmentally friendly friendly refrigerant Energy Star Certified |
| seer2 | Up to 24 |
| eer2 | Up to 12 |
| hspf2-4 | 9.5 |
| hspf2-5 | 7.0 |
| tonnage | 3.0 |
| cooling capacity (btu) | 36000.0 |
| heating capacity (btu) | 37000.0 |
| voltage (v) | 208/230 |
| phase | 1 |
| cycle (hz) | 60 |
| max fuse breaker (a) | 35 |
| min circuit ampacity (a) | 30.5 |
| color | White |
| max coverage area | Up to 1500 |
| zone capacity | 5.0 |
| refrigerant type | R-454B |
| refrigerant volume (oz) | 120.63 |
| decibel rating (dba) | 64.5 |
| inverter | DC |
| max lineset length (ft) | 262.4 total |
| lineset fitting type | Flare |
| compressor motor type | Rotary |
| condenser fan motor rpm | 900/750/600 |
| metering device | EXV |
| ul listed | Yes |
| csa listed | Yes |
| etl listed | Yes |
| energy star certified | Yes |
| ahri certified | Yes |
| base warranty | 5-Year Parts/7-Year Compressor |
| base parts warranty | 5-Year |
| base compressor warranty | 7-Year |
| base remote warranty | 5 Year |
| registered labor warranty | None |
| base labor warranty | None |
| has batteries | Yes |
| contains electronics | Yes |
| contains chemicals | Yes |
| contains compressed gas | Yes |
| proposition 65 warning | Yes |
| restricted states | GU, PR, VI |
| net depth (in) | 16.14 |
| net height (in) | 31.89 |
| net width (in) | 37.24 |
| net weight | 168.87 |
| gross depth (in) | 19.68 |
| gross height (in) | 34.84 |
| gross width (in) | 42.91 |
| gross weight (lbs) | 180.12 |
Manuals
- https://doxrepo.mrcool.com/mc-oly-mz-4g-im-um-en-01.pdf
- https://doxrepo.mrcool.com/mc-oly-mz-4g-sm-en-01.pdf
Documents
Warranty
Helpful Notes
Professional installation required
Installation must be completed by a qualified HVAC professional. Improper installation can cause water leakage, electrical shock, or fire.
Mode limitation (multi-zone)
The system heats or cools as a whole. You can’t heat one room while cooling another at the same time.
Line sets & wiring (options)
Line sets and communication wiring may be bundled depending on your selected options. If no installation kit is selected, they may not be included. Select the appropriate length for each indoor unit based on your layout.
Electrical & breaker sizing
Use MCA (30.5) and Max Fuse/Breaker (35) as starting points, then size per the installation manual and local code.
Line sizing
Indoor line sizes: 1/4 / 3/8 | 1/4 / 1/2. Confirm final line sizes, allowable lengths, and any additional charge requirements for your exact pairing before selecting line sets.
