Trane M5MHWUN24A1N0A Ductless Mini-split Indoor Air Handler 24000 Btu/h 19 Seer Heat Pump

Product Description

The Trane M5MHWUN24A1N0A is a wall-mounted ductless indoor air handler (IDU) rated at 24,000 BTU/h and designed for single-zone mini-split heat pump systems. Operating on R454B refrigerant at 208-230 volts, 1-phase power, this unit carries a 19 SEER efficiency rating and is marketed under the RunTru product line. It handles both cooling and heating functions as part of a matched outdoor unit system. Licensed HVAC technicians install this unit as part of a ductless split system in applications where running ductwork is impractical or cost-prohibitive. The indoor section mounts to a wall plate and connects to the outdoor condensing unit via refrigerant lineset and low-voltage control wiring.

This indoor air handler is suited for residential and light commercial single-zone applications. Typical installations include room additions, converted garages, server rooms, or any conditioned space where a standalone ductless solution is required. The unit operates with R454B refrigerant, a lower-GWP alternative to R410A, aligning with current industry refrigerant transition requirements. It is intended to be paired with a compatible Trane or RunTru outdoor condensing unit to form a complete mini-split heat pump system. HVAC technicians familiar with inverter-driven mini-split systems will recognize the standard wall-mount configuration with front-panel access for the air filter and internal components.

Key Features

• 24,000 BTU/h cooling capacity suitable for spaces up to approximately 1,000-1,200 square feet depending on load conditions
• 19 SEER efficiency rating for reduced operating costs relative to standard single-speed systems
• R454B refrigerant compliance meets current low-GWP refrigerant transition standards
• 208-230 volt, 1-phase electrical connection compatible with standard residential and light commercial service
• Wall-mount design with mounting plate, front-access air filter, and integrated drainage pipe for straightforward installation
• Heat pump IDU supports both heating and cooling modes from a single indoor unit

Compatibility

The M5MHWUN24A1N0A is a RunTru-branded Trane ductless indoor air handler designed to be paired with a compatible Trane or RunTru 24,000 BTU outdoor condensing unit in a matched single-zone mini-split heat pump system using R454B refrigerant.

Installation Notes

Installation must be performed by a licensed HVAC technician holding the appropriate EPA Section 608 refrigerant handling certification for R454B systems. Before any service or connection work, confirm that all power to the circuit is de-energized at the breaker. Refrigerant lineset sizing, line set length, and system evacuation procedures must follow the manufacturer installer guide (document 88-M5MHWUN-1A-EN) and applicable local mechanical codes. Do not operate the unit in cooling mode below the manufacturer-specified ambient temperature range, and ensure the condensate drain line is pitched correctly to prevent standing water in the drain pan.

Technical Specifications

• Cooling Capacity: 24,000 BTU/h
• SEER Rating: 19 SEER
• Refrigerant: R454B
• Voltage: 208-230 volts
• Phase: 1-phase
• Unit Type: Wall-mounted ductless indoor air handler (heat pump)
• Product Line: RunTru

Standard Information

• Brand: Trane
• Manufacturer Part Number: M5MHWUN24A1N0A