MRCOOL Universal Series 48K BTU, 4 Ton Air Handler - Multiposition (UAH18048-O)
The MRCOOL® Universal® Series 48K Air Handler is a high-efficiency HVAC solution engineered to deliver consistent, year-round comfort while helping homeowners cut down on energy costs. Whether you're upgrading an aging system or installing new equipment, this unit offers the ideal combination of performance, efficiency, and reliability. Designed with installation flexibility in mind, the Universal® 48K supports multiple configurations—including vertical, horizontal, and downflow setups—making it a versatile fit for a wide range of spaces. Its compact design allows for seamless placement in tight or unconventional areas. For added convenience, the unit is compatible with the MRCOOL® NO-VAC® Quick Connect® line set (sold separately), which arrives pre-charged to eliminate the need for vacuuming or flaring—significantly simplifying installation and saving on labor. The system also supports Universal® Series Heat Kits, offering increased heating capability during cold weather and providing peace of mind with emergency backup heat when needed. Inside, the air handler is equipped with an advanced M-shaped evaporator coil that maximizes surface area for heat exchange, enhances airflow, and improves overall system efficiency—all while keeping the unit lightweight. Built from 100% aluminum, the coil is corrosion-resistant, ensuring long-term durability with minimal maintenance. Operating at quiet sound levels similar to a household conversation or dishwasher, the Universal® 48K blends comfort with discretion. Backed by a 10-year parts warranty and a 2-year limited labor warranty, this air handler is a smart investment in your home’s comfort and efficiency.
Specifications
| Net Dimensions (In) |
21.5 D x 55.94 H x21.5 W |
| Net Weight (Lbs) |
186.51 |
| CFM |
1601/1442.1/1265.5/1088.9/N\A |
| Tonnage |
4 |
| Voltage (V) |
115/208/230 |
| Phase |
1 |
| Cycle |
60 |
| Max Fuse Breaker (A) |
15 |
| Min Circuit Ampacity (A) |
14.5/10 |
| Mount Type |
Multi-Position |
| Color |
Dark Grey |
| Refrigerant Type |
R-454B |
| Decibel Rating (Dba) |
N\A/53/49.5/33.5/N\A |
| Decibel Rating Low (Dba) |
33.5 |
| Decibel Rating High (Dba) |
53 |
| Number Of Speeds |
4 |
| Max Lineset Length (Ft) |
246 |
| Liquid Line Size |
8-Mar |
| Suction Line Size |
4-Mar |
| Filter Type |
Replaceable |
| Filter Size |
20 x 20 x 1 |
| Metering Device |
EXV |
| Auxiliary Heater Included |
No |
| Auxiliary Heater Available |
Yes |
| Auxiliary Heater Sizes |
5 KW / 8 KW / 10 KW / 15 KW / 20 KW |
| UL Listed |
Yes |
| CSA Listed |
Yes |
| ETL Listed |
Yes |
| Base Warranty |
10 Year Parts |
| Base Parts Warranty |
10 Years |
| Base Labor Warranty |
2 Year |
| Contains Electronics |
Yes |
| Contains Chemicals |
Yes |
| Contains Compressed Gas |
Yes |
What our Experts Think
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High-Capacity Performance – 48,000 BTU (4 Ton) design delivers reliable airflow for large homes and light commercial spaces.
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Multiposition Flexibility – Can be installed in upflow, downflow, or horizontal configurations to fit any duct setup.
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Optimized Pairing – Built to work seamlessly with MRCOOL Universal DC inverter condensers.
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Energy Efficient – Engineered to maximize SEER2 performance when matched with compatible condensers.
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Durable Build – Long-lasting construction with quiet, efficient operation for whole-home comfort.
Q&A
Q: What is this unit?
A: A 48,000 BTU (4 ton) Universal Series ducted air handler, designed to pair seamlessly with MRCOOL Universal condensers.
Q: What makes it “multiposition”?
A: It can be installed in upflow, downflow, or horizontal configurations, giving installers maximum flexibility.
Q: Is it inverter compatible?
A: Yes, it works with MRCOOL DC inverter condensers, ensuring smooth and efficient operation.
Q: What kind of homes is it best for?
A: Ideal for medium-to-large homes, typically 2,000–2,500 sq. ft., depending on insulation and climate.
Q: Does it support add-ons like heat kits?
A: Yes, it can be equipped with electric heat kits for supplemental heating.
Q: Why choose this model?
A: It provides quiet, efficient airflow, flexible installation options, and reliable performance for year-round comfort.
Maintenance Tips
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Replace or clean air filters every 1–3 months.
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Keep air vents and ducts free from dust and obstructions.
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Inspect blower motor and coils for dirt buildup.
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Ensure condensate drain line stays clear.
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Schedule annual professional service for peak airflow and efficiency.
