Trane M3THS2209A91NA Mini Split Heat Pump Outdoor Unit 9000 Btu/h 23 Seer 115 Volt Single Zone

Product Description

The Trane M3THS2209A91NA is a single-zone ductless mini split heat pump outdoor unit rated at 9,000 BTU/h cooling capacity and 9,500 BTU/h heating capacity. Operating on 115/60/1-phase power, this unit achieves a 23 SEER efficiency rating, making it suitable for high-efficiency residential and light commercial installations. It uses R-32 refrigerant and connects to a compatible indoor air handler via a 3/8-inch gas line and 1/4-inch liquid line. Licensed HVAC technicians install this unit as part of a complete ductless system in spaces where traditional ducted systems are impractical or unavailable.

The M3THS2209A91NA is designed for single-zone residential ductless applications, including room additions, garages, sunrooms, and converted spaces where a dedicated heating and cooling source is required. It is rated for installation across all regions at 18 SEER minimum compliance. The unit operates at low sound levels, cited in the range of 28 to 36 dB, making it appropriate for noise-sensitive environments such as bedrooms and home offices. The compatible indoor unit is the M3MHW2209A9N0A.

Key Features

• 23 SEER efficiency rating for high-performance single-zone cooling and heating
• 9,000 BTU/h cooling capacity and 9,500 BTU/h heating capacity
• 115/60/1-phase power supply — compatible with standard residential single-phase circuits
• R-32 refrigerant — lower global warming potential compared to R-410A
• Low sound operation in the 28 to 36 dB range
• Available for installation in all regions at 18 SEER compliance threshold
• Maximum overcurrent protection rated at 25 amps

Compatibility

Compatible indoor unit: M3MHW2209A9N0A. Designed for single-zone ductless mini split systems requiring 115-volt single-phase power. Confirmed compatible pairing data is sourced from Ameristar ductless system documentation.

Installation Notes

Installation must be performed by a licensed HVAC technician certified to handle refrigerants under EPA Section 608 regulations. Before any service or connection work, disconnect and lock out all electrical power to the system. The refrigerant used is R-32, which requires handling equipment rated and approved for flammable refrigerants — verify that all tools and recovery equipment are compatible before beginning work. Follow local mechanical and electrical codes, including NEC requirements for disconnect placement and overcurrent protection sizing, and consult the manufacturer installation manual for line set length and elevation limits.

Technical Specifications

• Cooling Capacity: 9,000 BTU/h
• Heating Capacity: 9,500 BTU/h
• SEER Rating: 23
• Voltage: 115/60/1 (115 volts, 60 Hz, single phase)
• Refrigerant: R-32
• Gas Line Connection: 3/8 inch
• Liquid Line Connection: 1/4 inch
• Maximum Overcurrent Protection: 25 amps
• Sound Level: 28 to 36 dB
• Unit Type: Outdoor Unit (ODU)
• Zone Configuration: Single Zone

Standard Information

• Brand: Trane
• Manufacturer Part Number: M3THS2209A91NA