Description
MRCOOL Olympus 9K BTU 3/4 Ton Wall-Mount Air Handler ONLY — O-09-HP-WMAH-230C-O
Professional-Grade Ductless Mini Split Indoor Unit for Precision Zone Control
The MRCOOL Olympus 9K BTU 3/4 Ton Wall-Mount Air Handler (O-09-HP-WMAH-230C-O) is a premium ductless indoor unit engineered for professional HVAC installations. As part of the Olympus series — MRCOOL's highest-tier ductless line — this air handler delivers superior comfort, whisper-quiet operation at just 38 dB, and smart connectivity via the MRCOOL Smart HVAC app. Designed for spaces up to 350 square feet, it pairs with compatible Olympus single-zone or multi-zone condensers to create a complete, high-efficiency mini split system.
Factory pre-charged with R-454B refrigerant — a next-generation, low-GWP alternative to R-410A — this unit meets current environmental standards while delivering outstanding performance. With a 27.4 SEER2 efficiency rating, the Olympus series dramatically reduces energy costs compared to conventional HVAC systems. Smart home integration with Amazon Alexa and Google Assistant provides hands-free control from anywhere.
Technical Specifications
| Specification | Value |
|---|---|
| Model / SKU | O-09-HP-WMAH-230C-O |
| Series | Olympus 4th Gen Air Handler |
| Type | Air Handler ONLY — Wall-Mount Ductless |
| Capacity | 9,000 BTU |
| Tonnage | 3/4 Ton |
| Coverage Area | 151–350 sq ft |
| SEER2 Rating | 27.4 |
| EER2 Rating | 15.4 |
| HSPF2 Rating | 12.5 |
| Refrigerant | R-454B |
| Voltage | 208-230V / 60Hz |
| Max Breaker | 15A |
| Min Circuit Ampacity | 3A |
| Sound Level | 38 dB |
| Dimensions | 33.74" W x 9.09" D x 11.81" H |
| Net Weight | 23.37 lbs (10.6 kg) |
| Liquid Line | 1/4" |
| Suction Line | 3/8" |
| WiFi / App | Yes — MRCOOL Smart HVAC App |
| Smart Home | Amazon Alexa, Google Assistant |
| Remote Control | Included |
| Certifications | UL Listed, ETL Listed, AHRI Certified |
| Warranty | 5-Year Parts |
Product Tips
- Air Handler ONLY: This listing is for the indoor air handler unit only. A compatible Olympus condenser (sold separately) is required to complete the system.
- Professional Installation Required: The Olympus series requires licensed HVAC installation. Proper vacuum, nitrogen testing, and refrigerant charging must be performed by a certified technician.
- Multi-Zone Compatible: This air handler is compatible with Olympus multi-zone condensers for up to 6-zone installations.
- R-454B Refrigerant: Uses next-generation R-454B refrigerant. Ensure your technician is certified for R-454B handling.
- Smart Control: Download the MRCOOL Smart HVAC app for remote control, scheduling, and energy monitoring from your smartphone.
Frequently Asked Questions
Is this a complete system or just the air handler?
This is the air handler (indoor unit) only. You will need a compatible Olympus condenser (outdoor unit) to complete the system. The condenser is sold separately.
What condenser is compatible with this air handler?
Compatible with MRCOOL Olympus single-zone condensers (O-XX-HP-C series) and multi-zone condensers (MULTI series). Always verify BTU compatibility when pairing units.
Does this require professional installation?
Yes. The Olympus series is a professional-grade system requiring a licensed HVAC technician. Refrigerant handling requires EPA Section 608 certification. DIY installation voids the warranty.
What refrigerant does this unit use?
Uses R-454B refrigerant — a next-generation, lower-GWP alternative to R-410A. The system is pre-charged at the factory.
What size room can this cool or heat?
The 9K BTU unit is designed for approximately 151–350 sq ft, depending on insulation, climate zone, and ceiling height.
Does this unit have WiFi?
Yes. This air handler includes built-in WiFi and is compatible with the MRCOOL Smart HVAC app for iOS and Android. It also works with Amazon Alexa and Google Assistant.
What electrical requirements are needed?
Requires a dedicated 15A circuit breaker at 208-230V. Minimum circuit ampacity is 3A.
What is the warranty?
5-Year Parts Warranty when registered within 30 days of installation by a licensed HVAC contractor.
Can this be used in cold climates?
When paired with a compatible Olympus heat pump condenser, the system can operate in heating mode down to 5°F ambient temperature, making it suitable for most US climates.
What accessories are compatible?
Compatible with MRCOOL Non-DIY line sets (MC25-1412 for 9K/12K/18K), MRCOOL Smart Wi-Fi Mini Stat, and MRCOOL Condenser Wall Mounting Kits.
Compatible Accessories
- MRCOOL Olympus Single-Zone Condenser (O-XX-HP-C series)
- MRCOOL Olympus Multi-Zone Condenser (MULTI series)
- MRCOOL Non-DIY Line Set (MC25-1412 for 9K/12K/18K)
- MRCOOL Smart Wi-Fi Mini Stat (MSTAT01)
- MRCOOL Condenser Wall Mounting Kit
Need help? Contact us at /contact-us/
Warranty Information
The MRCOOL Olympus 4th Gen Air Handler includes a 5-Year Parts Warranty when registered within 30 days of installation by a licensed HVAC contractor.
