MRCOOL — Wall Mount
MRCOOL Olympus 4th Gen Wall AH 18,000 BTU (1.5 Ton) – O-18-HP-WMAH-230C-O
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MRCOOL Olympus 4th Gen Wall AH 18,000 BTU (1.5 Ton) – O-18-HP-WMAH-230C-O
Overview
Ideal for up to 800 sq. ft., this ESTAR® 18K wall unit pairs quick, clean installation with quiet performance down to 19.5 dBA. Built-in Wi-Fi enables app and voice control, and the included remote keeps everyday adjustments simple. With efficiency up to SEER2 23.5 and low-GWP R-454B refrigerant, it’s an easy upgrade for bedrooms, offices, and garages seeking year-round comfort and lower operating costs. Covered by limited lifetime, 7-year compressor, and 5-year parts warranties.
Quick Facts
- Capacity: 18,000 BTU (1.5 Ton)
- Coverage: Up to 800 sq. ft.
- Refrigerant: R-454B
- Voltage/Phase/Frequency: 208/230V, 1-Phase, 60 Hz
- Sound: 49.5 / 45 / 38 / 31.5 / 19.5 dBA
- Fan Speeds: 5 (Variable) with Oscillation
- Smart Control: Wi-Fi + App + Alexa/Google
- Listings: UL, CSA, ETL
Use our sizing calculator (BTU Calculator).
Works With (Outdoor Units)
O-ES-18-HP-C-230C-O1, MULTI4-27HP230C-O, MULTI5-36HP230C-O, MULTI6-48HP230C-O
Key Features
- Clean, modern wall-mount design
- Quiet operation down to 19.5 dBA
- R-454B low-GWP refrigerant
- Wi-Fi/app/voice + handheld remote
- Sleep Mode, Auto Cool, Fan-Only
Technical Specifications
| Specification | Details |
|---|---|
| Brand / Series | MRCOOL / Olympus 4th Gen Air Handlers |
| Model | O-18-HP-WMAH-230C-O |
| GTIN / UPC | 00840255587723 / 840255587723 |
| Unit Type | Mini-Split |
| Tonnage | 1.5 |
| Voltage / Phase / Cycle | 208/230V / 1-Phase / 60 Hz |
| Max Fuse Breaker | 15 A |
| Min Circuit Ampacity | 3 A |
| Mount Type | Wall |
| Color | White |
| Max Coverage Area | Up to 800 |
| Refrigerant Type | R-454B |
| Sound (dBA) | 49.5 / 45 / 38 / 31.5 / 19.5 |
| Number of Speeds | 5 (Variable) |
| Oscillation | Yes |
| Lineset Fitting Type | Flare |
| Liquid / Suction Line | 1/4" / 1/2" |
| Blower Motor Speeds (CFM) | 635.7 / 500.3 / 359 / 294.3 / 294.3 |
| Blower Motor RPM | 1190 / 994 / 896 |
| Filter Type | Reusable |
| Aux Heater (Incl/Avail) | No / No |
| Fan Only / Sleep / Auto Cool | Yes / Yes / Yes |
| Wi-Fi / App / iOS / Android | Yes / Yes / Yes / Yes |
| Remote Included | Yes |
| UL / CSA / ETL Listed | Yes / Yes / Yes |
| Prop 65 | Yes |
| Restricted States | GU, PR, VI |
| Net Dimensions (HxWxD) | 12.64" × 40.31" × 9.69" |
| Net / Gross Weight | 27.34 lbs / 36.6 lbs |
| Gross Dimensions (HxWxD) | 15.75" × 43.11" × 12.8" |
Warranty Information
- Limited Lifetime (see MRCOOL terms)
- 7-Year Compressor Coverage
- 5-Year Parts Warranty
Manuals & Downloads
- Olympus 4th Gen Performance Sheet
- Olympus 4th Gen Service Manual
- Olympus 4th Gen Install/User Manual
- Olympus 4th Gen Brochure
Please note: Indoor air handler must be matched with a compatible MRCOOL outdoor unit.
