Hisense asu-18u3thb25u Mini-split Indoor Unit 18K Btu

Product Description

The HISENSE asu-18u3thb25u is an 18,000 BTU/h indoor wall-mounted air handler designed for multi-zone ductless mini-split heat pump systems. Operating on 208-230 volts and charged with R-454B refrigerant, this unit handles both cooling and heating loads in a single head. It connects to a compatible multi-zone outdoor condenser via a 1/4-inch liquid line and 1/2-inch suction fitting. The unit ships with a remote controller and supports optional wired wall controller or smart device app control via built-in Wi-Fi. HVAC technicians install this head as part of a multi-zone variable refrigerant system in residential or light commercial applications.

The asu-18u3thb25u is suited for multi-zone ductless installations where a single outdoor unit serves multiple indoor heads. Typical applications include residential bedrooms, living areas, offices, and add-on spaces where ducted distribution is not practical. The unit mounts high on an interior wall and requires a line set penetration through the wall to reach the outdoor condenser. It is not rated for single-zone (one-to-one) system configurations based on available data.

Key Features

• 18,000 BTU/h cooling and heating capacity in a wall-mounted form factor
• R-454B refrigerant — lower global warming potential alternative to R-410A
• Built-in Wi-Fi enables app-based remote access via compatible smart device platform
• 6.4-way auto-swing louver for wide air distribution coverage across the room
• Washable high-definition filter reduces maintenance cost and frequency
• Indoor self-cleaning function helps maintain coil hygiene between service intervals
• Auto-restart function restores prior settings after a power interruption

Compatibility

Designed for use in HISENSE multi-zone ductless mini-split systems operating at 208-230 volts with R-454B refrigerant. This is an indoor air handler only and requires a compatible multi-zone outdoor condensing unit. Single-zone pairing is not supported per available specifications.

Installation Notes

Installation must be performed by a licensed HVAC technician holding an EPA Section 608 refrigerant handling certification, as this unit uses R-454B, a mildly flammable (A2L) refrigerant requiring adherence to applicable safety codes. Shut off all power to the system at the disconnect before making electrical or refrigerant connections. Mount the indoor unit on a structurally sound wall surface using the provided mounting plate, ensuring proper pitch for condensate drainage through the dual-direction drain port. Follow the outdoor unit manufacturer wiring diagram and all local mechanical and electrical codes during commissioning.

Technical Specifications

• Cooling Capacity: 18,000 BTU/h
• Heating Capacity: 18,000 BTU/h
• Nominal Capacity: 18,000 BTU/h
• Voltage: 208-230 volts
• Refrigerant: R-454B
• Zone Type: Multi-Zone
• Unit Type: Indoor
• Style: Wall Mounted
• Width: 42-1/16 inches
• Height: 12-5/8 inches
• Depth: 9-1/16 inches
• Weight: 29.7 pounds
• Liquid Line Connection: 1/4 inch
• Suction Line Connection: 1/2 inch
• Sound Pressure Cooling: 48/45/41/39/36 dBA
• Sound Pressure Heating: 48/45/41/39/36 dBA
• Color: White/Black
• Wi-Fi Enabled: Yes
• Remote Included: Yes
• Shipping Weight: 105.8 pounds
• Shipping Dimensions: 39.19 inches L x 28.38 inches W x 16.50 inches H

Standard Information

• Brand: HISENSE
• Manufacturer Part Number: asu-18u3thb25u