Trane M5MHWUN12A1N0A High-wall Ductless Indoor Unit 12000 Btu/h 19 Seer R-454B 208-230V

Product Description

The Trane M5MHWUN12A1N0A is a 12,000 BTU/h high-wall ductless indoor air handler designed for single-zone mini-split systems operating on the R-454B refrigerant. Rated at 19 SEER, this unit is part of the Trane Runtru Value Series and is built for 208-230V single-phase power. It mounts to a wall-mounted plate and connects to a compatible outdoor inverter-driven condensing unit via refrigerant lines and low-voltage control wiring. Licensed HVAC technicians install and commission this equipment in both residential and light commercial applications.

This indoor unit is suited for single-zone cooling applications where a ductless high-wall configuration is preferred. Typical installations include bedrooms, additions, server rooms, retail spaces, and other areas requiring independent zone control without ductwork. The unit pairs with a compatible R-454B outdoor condensing unit to complete the system. Its inverter-compatible design allows the outdoor unit to modulate capacity to match the load, improving efficiency at partial-load conditions.

Key Features

• 12,000 BTU/h cooling capacity for single-zone ductless applications
• 19 SEER efficiency rating reduces operating costs in moderate climates
• R-454B refrigerant compliance meets current low-GWP refrigerant requirements
• 208-230V single-phase operation compatible with standard residential and light commercial electrical service
• High-wall indoor unit design with front-panel air filter for easy maintenance access
• Inverter-system compatible for variable-capacity operation and improved part-load efficiency

Compatibility

Designed for use with a compatible Trane R-454B inverter-driven outdoor condensing unit in a single-zone ductless mini-split system configuration. Confirm outdoor unit compatibility using Trane engineering documentation before installation.

Installation Notes

Installation must be performed by a licensed HVAC technician holding the appropriate refrigerant handling certification, as R-454B is an A2L mildly flammable refrigerant subject to specific handling and ventilation requirements under current codes. Shut off all electrical power to the circuit before mounting, wiring, or making refrigerant connections. Follow the manufacturer installer guide and applicable local mechanical and electrical codes for line-set sizing, drain slope, and electrical disconnect requirements. Do not mix refrigerants or attempt to retrofit this unit with refrigerants other than R-454B.

Technical Specifications

• Cooling Capacity: 12,000 BTU/h
• SEER Rating: 19 SEER
• Refrigerant: R-454B
• Voltage: 208-230 volts
• Phase: Single-phase
• Configuration: High-wall ductless indoor unit
• Series: Runtru Value Series

Standard Information

• Brand: Trane
• Manufacturer Part Number: M5MHWUN12A1N0A