Mitsubishi Electric 9000 BTU Wall Mounted Ductless Mini Split Heat Pump System R454B Refrigerant | MZ-FX09NL

Overview

This Mitsubishi Electric Trane HVAC US wall-mounted ductless heat pump system pairs the MSZ-FX09NL indoor unit with the MUZ-FX09NLHZ H2i Sumo Hyper-Heating INVERTER outdoor unit. It is rated 9,000 BTU/h for cooling and 12,000 BTU/h for heating at 47°F, with variable-capacity operation to match changing loads. Efficiency ratings include 33.1 SEER2, 18.35 EER2, and 13.3 HSPF2 [IV]. The system uses R454B refrigerant and ships factory pre-charged for up to 25 ft (7.50 m) of piping. Electrical requirements are 208/230V, 1 phase, 60 Hz with a recommended 15A outdoor fuse/breaker. Indoor unit dimensions are 39.28 x 9.75 x 12.00 in (998 x 247 x 305 mm) and outdoor unit dimensions are 31.50 x 11.25 x 28.13 in (800 x 285 x 714 mm). Indoor package dimensions are 43.31 x 12.75 x 15.75 in (1100 x 330 x 400 mm) and outdoor package dimensions are 37.00 x 15.00 x 35.00 in (940 x 380 x 890 mm).

Performance

Cooling capacity modulates from 2,500 to 15,000 BTU/h with a rated input of 490 W at 95°F conditions. Heating at 47°F is rated at 12,000 BTU/h with a rated input of 710 W, supporting efficient cold-weather operation. The H2i Sumo Hyper-Heating INVERTER design maintains 100% heating capacity at -10°F and is guaranteed to operate down to -22°F. The outdoor unit uses a twin rotary compressor (model SRB140FQHMT) and reverse-cycle defrost. Outdoor airflow is listed at 1,815 CFM in cooling and 1,321 CFM in heating, supporting stable heat exchange across operating conditions. Blue Fin coating is applied to the outdoor heat exchanger fins to help resist corrosion from salt, sulfur, and other airborne contaminants.

Smart Features

Built-in 3D i-see Sensor scans the room to build a thermal profile based on size, temperature, and movement, then adjusts temperature and airflow based on occupancy and user preference. Wi-Fi enabled capability supports pairing with the Comfort app for control of temperature, fan speeds, operating modes, schedules, and more. Multiple control options are supported, including a provided back-lit handheld remote controller plus optional wired and wireless controllers. Third-party interfaces are supported, including a thermostat interface accessory for integration with compatible external controls. Econo Cool mode automatically adjusts airflow based on heat exchanger temperature while slightly increasing setpoint to reduce energy use. Powerful Mode temporarily changes setpoint and fan speed to pull down or warm up the space more quickly.

Comfort & Noise

Indoor fan speed selections include Low, Medium, High, Powerful, and Auto to tune airflow to occupant preference and room load. Indoor airflow in cooling (dry) ranges from 198 to 526 CFM, supporting both quiet operation and higher-output delivery when needed. Indoor sound pressure levels in cooling range from 20 to 44 dB(A), with a 20 dB(A) minimum listed for low-speed operation. The outdoor unit sound pressure level is listed at 49 dB(A) in both cooling and heating. Dual Vane airflow control allows independent vane direction to spread air across wide areas or to different locations in the room. Smart Dry+ mode provides humidity control with minimal over-cooling of the space.

Use Case Fit

This system is designed for wall-mounted, ductless zone comfort control where precise temperature and airflow management is required. It supports cold-climate applications with heating operation listed down to -22°F outdoor conditions and a built-in base pan heater on the outdoor unit. Cooling operation is listed up to 115°F outdoor intake temperature, supporting summer operation across a wide range of climates. Piping connections are flared 1/4 in liquid and 3/8 in gas, with a maximum piping length of 65 ft (20 m) and a maximum height difference of 40 ft (12 m). Factory charge supports up to 25 ft of piping, and additional charge is specified at 0.22 oz/ft for longer runs. Optional accessories listed for the platform include condensate pumps and outdoor mounting supports such as stands and wall brackets.

Value & Reliability

Dual Barrier Coating on the indoor heat exchanger reduces collection of contaminants like dust, fibers, smoke, and oil on internal surfaces to help maintain airflow. Dual Barrier Fusion is fused into the indoor vane material to reduce contaminant buildup and support vane cleanliness and odor reduction over time. The outdoor unit includes Blue Fin coating to protect the heat exchanger fins in coastal or industrial environments where airborne contaminants are common. Hot-start technology prevents the fan from blowing until the heat exchanger has warmed, reducing cold drafts at start-up in heating mode. Triple Action Filtration includes standard microparticle and electrostatic enzyme filters, with an optional carbon-based deodorizing filter. Recommended outdoor overcurrent protection is 15A, supporting straightforward electrical integration for 208/230V applications.

Summary Wrap-Up

The MUZ-FX09NLHZ with MSZ-FX09NL delivers variable-capacity cooling and Hyper-Heating performance in a wall-mounted ductless format. It combines listed efficiency ratings of 33.1 SEER2, 18.35 EER2, and 13.3 HSPF2 [IV], low indoor sound levels, and room-sensing control to manage comfort in small-zone applications. R454B refrigerant, factory charge for 25 ft piping, and published piping limits simplify system planning for a wide range of layouts. Indoor and outdoor protective coatings help reduce contaminant buildup on key heat exchange and airflow surfaces. Multiple control options, including app-based scheduling and optional third-party interfaces, support both homeowner and contractor preferences. For D2C buyers seeking cold-weather heating and for wholesale customers standardizing on a high-efficiency ductless platform, this kit provides a complete indoor/outdoor system with published performance data.

Key Features

• H2i Hyper-Heating INVERTER: Maintains 100% heating capacity at -10°F with guaranteed operation down to -22°F for cold-climate comfort.
• Variable-capacity output range: Delivers 2,500–15,000 BTU/h cooling with 9,000 BTU/h rated cooling capacity to match changing loads.
• R454B factory charge: Includes 2 lb 12 oz of pre-charged refrigerant for up to 25 ft of piping, with 0.22 oz/ft add-on charge for longer runs.
• Wall-mounted air delivery: Uses Dual Vane directional control with indoor airflow up to 526 CFM (cooling, dry) and listed sound levels down to 20 dB(A).
• Room sensing and humidity modes: Combines the 3D i-see Sensor with Smart Dry+ mode to adjust airflow and manage humidity with minimal over-cooling.
• Surface protection coatings: Uses Blue Fin coating on the outdoor heat exchanger and Dual Barrier Coating/Fusion on indoor components to reduce contaminant buildup.
• Control and connectivity options: Includes a back-lit handheld remote and supports the Comfort app plus optional wired, wireless, and third-party control interfaces.