Mitsubishi Electric 48,000 BTU 17.6 SEER2 Quad Zone Wall Mounted Ductless Mini Split Heat Pump System 9+9+12+15 R454B Refrigerant | MXZ-SM48NL-MSZ-GX09NL-MSZ-GX09NL-MSZ-GX12NL-MSZ-GX15NL

Overview

The Mitsubishi Electric MXZ-SM48NL system is a 48,000 Btu/h multi-zone heat pump configuration built around a single outdoor unit and the indoor units listed in this SKU. It uses R454B refrigerant and 208/230V, 1-phase, 60Hz power for North American applications. This platform is intended for zoned comfort with a mix of ductless and ducted possibilities, depending on the indoor unit selection. Efficiency ratings are listed as SEER2 23.00 (non-ducted), 20.00 (mixed), 17.00 (ducted) and HSPF2 10.40 (non-ducted), 9.95 (mixed), 9.50 (ducted). The configured system includes 2x MSZ-GX09NL, MSZ-GX12NL, MSZ-GX15NL indoor unit(s) paired to one MXZ-SM48NL outdoor unit. Included indoor units span nominal cooling capacities from 9,000 to 14,000 Btu/h, supporting room-by-room zoning.

Performance

Rated cooling capacity at 95°F is 48,000 Btu/h, and rated heating capacity at 47°F is 50,000 Btu/h. Heating performance is listed at 17°F as 31,400 Btu/h (non-ducted), 32,400 Btu/h (mixed), and 33,400 Btu/h (ducted). Maximum heating capacity at -13°F is 22,800 Btu/h. The outdoor unit uses a Twin Rotary compressor (model MRB36FEGMC-L) and reverse-cycle defrost. Blue fin heat exchanger coating is listed as Yes, and the base pan heater is optional. Line connections are 3/8 in liquid and 5/8 in gas for the outdoor unit.

Smart Features

The system is designed to support multiple control approaches depending on the indoor unit selection and accessory choices. Control accessories listed for the indoor lineup include kumo station for the Comfort app (PAC-WHS01HC-E), a wireless interface adapter (PAC-USWHS002-WF-2), and a third-party thermostat interface (PAC-US445CN-1). Indoor unit submittals list options for MA wired controllers, simple wired controllers, and wireless handheld controller accessories where applicable. For integration, interfaces listed include M-Net I/O control interfaces and BACnet/Modbus gateway options for building controls. These accessories enable centralized control, scheduling, and remote monitoring setups without requiring proprietary third-party thermostats. Configuration planning should consider zone count, indoor unit placement, and the allowable connected capacity range for the outdoor platform.

Comfort & Noise

Zoning allows different rooms to call for heating or cooling without conditioning unused areas. Outdoor sound pressure is 51 dB(A) in cooling and 54 dB(A) in heating. Indoor sound pressure levels range from 19 to 51 dB(A) depending on indoor model and fan speed. Indoor airflow ranges up to 586 CFM at cooling (dry), depending on indoor model and fan setting. The indoor lineup includes DC fan motors and lists dual barrier coating (DBC) on the heat exchanger for the GX series. Econo Cool is listed for the GX indoor lineup and adjusts airflow based on heat exchanger temperature to maintain comfort. Together, the outdoor and indoor components are suited to steady temperature maintenance with minimal swings.

Use Case Fit

The outdoor unit operates from 23 to 115°F in cooling and -13 to 70°F in heating, making it suitable for a wide range of U.S. climate zones. Guaranteed voltage range is listed as 198–253V, supporting typical residential and light commercial electrical service. It supports up to 8 connected indoor units with a branch box and up to 12 without a branch box, with a maximum connected capacity of 62,400 Btu/h. Minimum connected capacity is 12,000 Btu/h with a branch box and 24,000 Btu/h without a branch box. This makes the platform a fit for multi-room homes, townhomes, and multi-family units that need independent zones. It is also applicable for mixed-use layouts when the indoor unit selection matches the required mount type and airflow needs.

Value & Reliability

The outdoor platform lists multiple protection functions including compressor overcurrent detection, compressor thermal protection, fan motor overheating/voltage protection, and high-pressure protection. Seacoast protection is listed on the heat exchanger and base panel with a 2,000-hour salt spray rating (ASTM B117). Pre-charged refrigerant amount is 2, 11 (lbs, oz), supporting typical installation pipe runs within published limits. Indoor GX submittals list electrostatic enzyme filtration (built-in) and optional microparticle filtration for particulate capture. Common electrical specifications across the indoor GX lineup include 208/230V, single-phase, 60Hz operation for consistent system planning. Service planning benefits from standardized piping sizes across the indoor lineup, depending on the indoor model capacity.

Summary Wrap-Up

The MXZ-SM48NL multi-zone platform is built for buyers who want one outdoor unit to serve multiple comfort zones. This SKU’s indoor unit mix lets you plan zones by room size while keeping a single condenser footprint outdoors. Cold-weather capability and defrost strategy are defined at the outdoor unit level, with published low-ambient performance available in the spec table. Control accessories support everything from simple local control to app-based and building-control integrations. For wholesale projects, the platform supports standardized electrical and refrigerant requirements across zones. For D2C buyers, it provides a clear path to zoned comfort with expandable configuration options.

Key Features

• R454B refrigerant system: Uses R454B refrigerant with a pre-charge of 2, 11 (lbs, oz) on the outdoor unit.
• Multi-zone connection capacity: Supports up to 12 indoor units without a branch box and 8 with a branch box, with up to 62,400 Btu/h connected capacity.
• Twin rotary compressor: Uses a Twin Rotary compressor (model MRB36FEGMC-L) for variable-capacity operation.
• Low-ambient heating performance: Lists 22,800 Btu/h maximum heating capacity at -13°F.
• Outdoor sound ratings: Lists 51 dB(A) in cooling and 54 dB(A) in heating.
• Refrigerant piping connections: Outdoor liquid line is 3/8 in and gas line is 5/8 in.
• Defrost and coil protection: Uses reverse cycle defrost and lists blue fin heat exchanger coating.