Trane M5MHWUN12B1N0A Mini Split Indoor Wall Unit 12000 Btu/h Ductless Heat Pump Air Handler

Product Description

The Trane M5MHWUN12B1N0A is a ductless mini split indoor wall unit designed for residential and light-commercial heating and cooling applications. This high-wall air handler pairs with a compatible Trane outdoor condensing unit to deliver conditioned air without the need for ductwork. The unit mounts to a wall-mounted plate, connects to the outdoor unit via refrigerant lines and low-voltage wiring, and discharges conditioned air through an adjustable deflector and flap. It is installed by licensed HVAC technicians as part of a split-system heat pump or cooling-only configuration in the 9,000 to 24,000 BTU/h capacity range.

The M5MHWUN12B1N0A is suited for single-zone residential spaces such as bedrooms, additions, sunrooms, and converted garages where ducted systems are impractical or unavailable. It is also used in light-commercial spaces such as server rooms, offices, and retail areas requiring independent zone control. Installation follows the procedures outlined in Trane Installer Guide 88-M5MHWUN-1A-EN. Compatible system configurations cover the 9K through 24K BTU/h indoor unit platform as documented in that guide.

Key Features

• High-wall ductless design mounts on a wall plate for space-efficient installation
• Adjustable air deflector and flap for directional airflow control
• Integrated air filter accessible from the front panel for routine maintenance
• Emergency operation button on the unit for manual override
• Refrigerant line and drainage connections routed through a valve protective cover for a clean finish
• Compatible with Trane outdoor units in the 9K to 24K BTU/h indoor unit platform

Compatibility

Designed for use with compatible Trane outdoor condensing or heat pump units in the M5MHWUN series indoor wall unit platform, covering 9,000 through 24,000 BTU/h configurations as referenced in Trane Installer Guide 88-M5MHWUN-1A-EN. Verify outdoor unit compatibility against that guide before ordering.

Installation Notes

Installation must be performed by a licensed HVAC technician holding the appropriate EPA Section 608 refrigerant handling certification. Shut off all power to both the indoor and outdoor units at the disconnect and breaker before beginning any wiring or refrigerant line work. The mounting plate must be secured to solid wall structure and verified level before hanging the air handler. Condensate drainage must be pitched to drain freely per local mechanical code requirements, and all refrigerant line connections must be leak-checked after commissioning.

Technical Specifications

• Product Type: Ductless Mini Split Indoor Wall Unit
• Capacity Range: 9000 to 24000 BTU/h (9K to 24K platform)
• Configuration: High-wall ductless air handler
• Application: Single-zone residential and light-commercial
• Refrigerant Connection: Gas valve (low pressure) and liquid valve (high pressure)
• Drainage: Drainage pipe included
• Air Filter: Front-accessible panel filter

Standard Information

• Brand: Trane
• Manufacturer Part Number: M5MHWUN12B1N0A