4 Zone 42,000 BTU OLMO Series Ductless Mini Split AC Wall Mounted 9k+9k+9k+24k | No Kit

OLMO5-Yr Warranty

OS-RMS42-230VOM09SRWM09SRWM09SRWM24SRW-NO
Product specifications
Brand Olmo
Voltage 230V
SEER 21
WiFi Included
Zone Four Zone
Type Wall Mount
Freon R454B
Compressor Inverter
$3,739.50 Sold out
Shipping Policy calculated at checkout.
Add more to unlock bulk savings
All Zones Installation Kit: No Installation Kit

Pickup currently unavailable at 3550 Northwest 113th Court

FREE Armbridge Accessory With This Purchase

Choose one below — it will be added to your cart for free

Select your free accessory:

FREE
ARMBRIDGE AB-RF Rubber Feet Mounting Set Heavy-Duty Adjustable Base with Built-In Leveler
AB-RF Rubber Feet Mounting Set Heavy-Duty Adjustable Base...
FREE
ARMBRIDGE Mini Split Wall Mounting Bracket High Load Capacity Zinc, Vibration-Absorbing (Up to 550 lbs Each)
Mini Split Wall Mounting Bracket High Load Capacity Zinc,...
FREE
ARMBRIDGE Mini Split Wall Mounting Bracket High Load Capacity Foldable 304 Stainless Steel, Vibration-Absorbing (Up to 550 lbs Each)
Mini Split Wall Mounting Bracket High Load Capacity Folda...
FREE
ARMBRIDGE Heavy-Duty Mini Split Ground Stand, Zinc-Coated Brackets for 24,000–60,000 BTU Units Weatherproof Design, 330+ lbs Capacity
Heavy-Duty Mini Split Ground Stand, Zinc-Coated Brackets ...
FREE
ARMBRIDGE 18"x38"x3" Ribbed Plastic Condenser Pad Shock-Absorbing, Anti-Slip Foundation for HVAC Systems and Outdoor Equipment
18"x38"x3" Ribbed Plastic Condenser Pad Shock-Absorbing, ...
Free gift added to your cart!
All Zones Installation Kit
Discount Banner
TrustScore 4.8

Sierra Wall Mount

OLMO's Multi-Zone Sierra Series is a versatile HVAC solution that provides efficient heating and cooling for multiple rooms, featuring advanced inverter technology for precise temperature control and significant energy savings. Using eco-friendly R410A refrigerant, the system delivers reliable performance with minimal environmental impact. Ideal for both residential and commercial applications, the Sierra Series combines quiet operation, flexible installation, and user-friendly controls, making it a perfect choice for maintaining year-round comfort across multiple zones with one efficient system.

White multi-zone sierra air conditioner with shield logo and checkmark.

Warranty and Tech Support Info

By selecting OLMO products for your home or business, you’ll receive expert technical support from heating and cooling specialist, including access to product manuals, troubleshooting guides and warranty information.

The manufacturer provides a Limited Warranty of 5 years for the compressor and 2 years for parts.

Warranty terms
White wall-mounted air conditioner with sleek design and modern aesthetic.

Main Features

OLMO's Multi-Zone Sierra Series delivers efficient multi-room comfort with advanced inverter technology for precise temperature control. Its eco-friendly R454B refrigerant reduces environmental impact, while quiet operation ensures minimal disruption. With flexible installation options, sleek design, and reliable heating and cooling, it’s the perfect solution for modern multi-zone climate control needs.

All Accessories Included

With your purchase, you receive a comprehensive MiniSplit system. MiniSplits4Less ensures you have everything needed for a seamless installation. Your package includes an Indoor Unit, Outdoor Unit, Remote Control, Manuals, optional LineSet, and a Smartkit (WIFI). We've meticulously thought of every detail to provide you with all the essentials for your installation.

Technical Specifications

Indoor Models OS-RM09SW-230VI OS-RM12SW-230VI OS-RM18SW-230VI OS-RM24SW-230VI
Power Supply (V-Ph-Hz) 208/230V-1Ph-60 208/230V-1Ph-60 208/230V-1Ph-60 208/230V-1Ph-60
Cooling Capacity (Btu/h) 9000 12000 18000 23400
Heating Rated Capacity (Btu/h) 9500 13000 19000 26000
Output Power (W) 25 25 35 35
Rated Current (A) 0.11 0.11 0.17 0.17
Indoor Air Flow (CFM) 341 365 647 706
Indoor Noise Level (Hi/Mi/Lo) (dB(A)) 39/35/30 39/35/30 45/41/37 47/45/42
Net Dimensions (WxHxD) (in) 32.02x10.75x8.13 37.38x10.75x8.13 48x12.63x9.25 48x12.63x9.25
Packing (WxHxD) (in) 39.38x13.19x6.38 39.38x13.19x6.38 51.75x15.44x12.50 51.75x15.44x12.50
Net/Gross Weight (lbs) 19.84 / 24.25 19.84 / 24.25 31.97 / 37.48 31.97 / 37.48
Refrigerant Piping (Liquid Side / Gas Side) (in) 1/4" / 3/8" 1/4" / 3/8" 1/4" / 1/2" 3/8" / 5/8"
Outdoor Models OS-RMS18-230VO OS-RMS24-230VO OS-RMS36-230VO OS-RMS42-230VO
Power Supply (V-Ph-Hz) 208/230V-1Ph-60 208/230V-1Ph-60 208/230V-1Ph-60 208/230V-1Ph-60
Cooling Capacity (Btu/h) 18000 27000 36000 42000
EER2 13.33 12.85 12.85 12.0
SEER2 22.0 23.0 22.0 22.0
Heating Rated Capacity (Btu/h) 18000 27000 36000 36000
HSPF2 10.0 10.0 10.0 9.5
COP2 (W/W) 3.82 3.60 3.91 3.60
Max Fuse (A) 30 40 50 60
Outdoor Air Flow (Hi) (CFM) 1850 3357 3357 3357
Outdoor Side Noise Level (dB(A)) 55 62 64 64
Dimensions (WxHxD) (in) 33.88x26.38x12.25 38.38x32.88x14.12 38.38x32.88x14.12 38.38x32.88x14.12
Outdoor Unit Packing (WxHxD) (in) 39x28.75x17.75 43.75x37.75x18.12 43.75x37.75x18.12 43.75x37.75x18.12
Net/Gross Weight (lbs) 101.4/112.4 160.6/183.2 169.8/191.8 172/194
Refrigerant Type/Quantity (oz) R454B/51.15 R454B/76.2 R454B/105.8 R454B/105.8
Refrigerant Piping (Liquid Side / Gas Side) (in) 1/4" / 3/8" 1/4" / 3/8" 1/4" / 3/8" 1/4" / 3/8"
Max Refrigerant Pipe Length Each/Total (ft) 82/164 82/230 82/230 82/262
Ambient Outdoor (Cooling) (°F) 5~125 5~125 5~125 5~125
Ambient Outdoor (Heating) (°F) -13~75 -13~75 -13~75 4~75

Multiple Control Methods

Olmo’s Multi-Zone Sierra Series can be managed with a user-friendly remote control and the. This options offer precise temperature adjustments and optimal climate control for ultimate convenience.

App Promo

Frequently Asked Questions

How many rooms can the Olmo 4 Zone 42,000 BTU mini split cool?

The Olmo 4 Zone 42,000 BTU system is designed to effectively cool multiple rooms, with the capacity to serve up to four distinct zones. Depending on the layout and insulation of your spaces, it can accommodate a variety of room sizes efficiently.

Can I mix BTU sizes with the Olmo mini split system?

Yes, with the Olmo 4 Zone 42,000 BTU mini split, you can mix BTU sizes across different zones, as long as the total does not exceed the overall capacity of 42,000 BTU. This flexibility allows you to customize the cooling needs based on the specific requirements of each room.

Do all zones run simultaneously in the Olmo multi-zone mini split?

In the Olmo 4 Zone mini split, all zones can be operated simultaneously, providing efficient cooling or heating as needed. This feature allows you to maintain comfortable temperatures in multiple rooms at once, thanks to its 21.0 SEER efficiency rating.

Is the Olmo mini split system more efficient than using multiple single-zone units?

The Olmo 4 Zone 42,000 BTU mini split system, with its 21.0 SEER rating, is generally more efficient than multiple single-zone systems. This efficiency not only reduces energy costs but also streamlines installation and maintenance across four zones.

What warranty does the Olmo mini split offer?

The Olmo 4 Zone 42,000 BTU mini split comes with a 5-year parts and compressor warranty, ensuring that you have reliable coverage for your investment. This warranty reflects the brand's commitment to quality and customer satisfaction.

Does the Olmo mini split come pre-charged with refrigerant?

Yes, the Olmo 4 Zone 42,000 BTU system comes pre-charged with R454B refrigerant for up to 25 ft of line set. This pre-charging simplifies the installation process, allowing for a quicker setup and immediate operation.