MRCOOL Olympus Multi-Zone 4th Gen — Ceiling Cassette System (Professional Installation)
MRCOOL Olympus 4th Generation 2-Zone Ductless Mini Split AC & Heat Pump 48000 BTU (18K+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
48000 BTU
2 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
MULTI6-48HP230C-O + 2X CASSETTE18HP-230C-P-O
MULTI6-48HP230C-O + 2X CASSETTE18HP-230C-P-O
Outdoor Model
MULTI6-48HP230C-O
MULTI6-48HP230C-O
Min Circuit Ampacity
34.0
34.0
Max Fuse / Breaker
40
40
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: MULTI6-48HP230C-O
- Indoor ceiling cassettes:
- 18,000 BTU (x2) — 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 — 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 — MULTI6-48HP230C-O
| brand name | MRCOOL |
|---|---|
| series | Olympus 4th Gen Multi-Zone Condensers |
| model | MULTI6-48HP230C-O |
| unit type | Mini-Split |
| short description | Olympus 48,000 BTU Mini-Split Condenser - 230V/60Hz |
| long description | The MRCOOL® Olympus 48,000 BTU multi-zone heat pump condenser is a heating and cooling powerhouse engineered to handle up to six indoor units at once. Ideal for larger homes or spaces with diverse climate needs, this ductless solution offers precise, room-by-room comfort without the complexity of traditional HVAC systems. At the heart of its performance is advanced inverter technology, which maximizes energy efficiency with SEER2 ratings as high as 24 and HSPF2-4 ratings up to 10.6. Whether it’s sweltering heat or freezing cold, this unit remains dependable—capable of operating in outdoor temperatures as low as 5°F. Flexible compatibility with MRCOOL indoor unit styles—including sleek wall mounts, ceiling cassettes, and concealed duct models—ensures seamless integration with your home’s design. Ease of use is built into the experience. Control your climate with the intuitive MRCOOL SmartHVAC app, traditional remotes, or hands-free commands via Amazon Alexa and Google Assistant. Features such as sleep mode, auto restart, and refrigerant leak detection are designed to keep your system running smoothly, safely, and efficiently. With a 7-year compressor warranty and a 5-year parts warranty (when professionally installed), the Olympus MULTI6-48HP230C-O delivers high-capacity performance, intelligent control, and year-round reliability—perfect for those who need complete climate flexibility throughout a larger living space. |
| 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 12.5 |
| hspf2-4 | 10.3 |
| hspf2-5 | 8.0 |
| tonnage | 4.0 |
| cooling capacity (btu) | 47000.0 |
| heating capacity (btu) | 48000.0 |
| voltage (v) | 208/230 |
| phase | 1 |
| cycle (hz) | 60 |
| max fuse breaker (a) | 40 |
| min circuit ampacity (a) | 34.0 |
| color | White |
| max coverage area | Up to 2000 |
| zone capacity | 6.0 |
| refrigerant type | R-454B |
| refrigerant volume (oz) | 148.15 |
| decibel rating (dba) | 63 |
| inverter | DC |
| max lineset length (ft) | 262.4 total |
| lineset fitting type | Flare |
| compressor motor type | Rotary |
| condenser fan motor rpm | 800/700/650 |
| 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) | 16.34 |
| net height (in) | 52.48 |
| net width (in) | 37.48 |
| net weight | 222.0 |
| gross depth (in) | 19.49 |
| gross height (in) | 58.27 |
| gross width (in) | 43.11 |
| gross weight (lbs) | 254.19 |
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 (34.0) and Max Fuse/Breaker (40) as starting points, then size per the installation manual and local code.
Line sizing
Indoor line sizes: 1/4 / 1/2. Confirm final line sizes, allowable lengths, and any additional charge requirements for your exact pairing before selecting line sets.
