Mitsubishi Electric 24000 BTU Wall Mounted Ductless Mini Split Heat Pump System R454B Refrigerant | MZ-FX24NL

Overview

Mitsubishi Electric’s MUZ-FX24NLHZ-MSZ-FX24NL is a bundled ductless heat pump system pairing the MSZ-FX24NL wall-mounted indoor unit with the MUZ-FX24NLHZ outdoor unit. It delivers a rated 20,800 BTU/h of cooling and 19,800 BTU/h of heating for single-zone comfort control. This system uses R454B refrigerant and operates on 208/230V, 1-phase, 60Hz power for common North American electrical service. Efficiency ratings are listed at 23.5 SEER2 and 10.5 HSPF2 (Region IV), supporting high seasonal performance in both cooling and heating. Factory piping support includes 1/4 in liquid and 5/8 in gas line connections, with a maximum piping length of 100 ft and up to 50 ft of pre-charged piping length. The indoor unit’s slim wall-mount format provides zone comfort without ductwork while the outdoor unit includes a built-in base pan heater for low-ambient operation.

Performance

The outdoor unit uses an INVERTER-driven twin rotary compressor to modulate output from low to high capacity as conditions change. Rated power input is 1,560 W in cooling and 1,500 W in heating, with maximum power input listed at 3,370 W (cooling) and 3,590 W (heating at 47°F). Indoor airflow is adjustable across multiple fan speeds, reaching up to 720 CFM in cooling (dry) and up to 749 CFM in heating (dry) for effective air distribution. Moisture removal is listed at 4 pints per hour to support dehumidification during cooling and dry operation. Coil and surface protection features include Dual Barrier Coating on the indoor heat exchanger and Blue Fin Coating on the outdoor heat exchanger fins to support long-term heat transfer performance in varied environments. System piping allowances include a 50 ft maximum pre-charged piping length and an additional refrigerant charge rate of 0.22 oz/ft beyond that length when required.

Smart Features

The MSZ-FX24NL indoor unit includes a built-in 3D i-see Sensor that scans the room to map heat signatures, temperature, and movement, then adjusts airflow and setpoint behavior based on occupancy. Wi‑Fi connectivity enables control through the Mitsubishi Electric Comfort app for temperature, fan speed, mode selection, and scheduling from a phone or tablet. A back-lit handheld remote controller is supplied for local control, and the system supports multiple controller pathways including wired and wireless controllers as well as third-party interface options when used. Available operating selections include cooling, heating, dry, and automatic operation, along with Powerful Mode for rapid pull-down or warm-up and Auto fan control for set-and-forget operation. Econo Cool adjusts airflow based on heat exchanger temperature and slightly increases set temperature to reduce energy use while maintaining comfort. These controls and sensors work together to balance comfort, responsiveness, and energy management across changing load conditions.

Comfort and Noise

For occupied spaces, the indoor unit operates across a published sound pressure range of 27 to 53 dB(A) in cooling and 26 to 55 dB(A) in heating, depending on fan speed. The outdoor unit sound pressure level is listed at 55 dB(A) in both cooling and heating operating conditions. Dual Vane airflow provides independent vane direction control to distribute air across a wider area of a room or to different locations within the same zone. Hot-start technology prevents the indoor fan from blowing until the heat exchanger has warmed in heating mode, reducing cool drafts at start-up. Smart Dry+ provides humidity control with minimal over-cooling, and Econo Cool supports comfort-focused airflow management during cooling. Together, these features support stable room temperature control, targeted airflow, and reduced disruption from start-stop cycling.

Use Case Fit

This bundled wall-mounted ductless system is designed for spaces that benefit from dedicated zone control without extending or modifying ductwork. The outdoor unit’s H2i Sumo Hyper-Heating INVERTER performance is listed to maintain 100% heating capacity at -10°F and provides guaranteed operation down to -22°F for cold-weather applications. Cooling operation is listed for outdoor intake temperatures from 14°F up to 115°F to support a wide range of seasonal conditions. Fan speed selections (Low, Medium, High, Powerful, Auto) and adjustable vane control help match airflow to room layout, load changes, and occupant preference. With 1/4 in liquid and 5/8 in gas piping connections, the system supports common line set configurations and a maximum height difference of 50 ft between indoor and outdoor units. This combination of operating range, capacity modulation, and airflow control supports a wide variety of residential and light commercial zone-conditioning scenarios.

Value and Reliability

Design elements focus on maintaining airflow and heat transfer performance over time, including patented Dual Barrier Coating on the indoor heat exchanger and Dual Barrier Fusion on indoor vanes to reduce contaminant buildup. Triple Action Filtration includes standard microparticle and electrostatic enzyme filters, with an optional carbon-based deodorizing filter for odor control. The outdoor unit’s Blue Fin Coating provides additional protection on the heat exchanger fins, supporting installations in coastal or industrial environments where corrosion exposure may be higher. A built-in base pan heater supports cold-weather operation by helping manage ice accumulation in low ambient conditions. Serviceability is supported by flared refrigerant connections and a published additional charge rate for longer piping runs beyond the pre-charged length. These materials, coatings, and electrical design specifications support long-term performance with predictable operating characteristics.

Summary Wrap-Up

The MUZ-FX24NLHZ-MSZ-FX24NL bundle delivers 20,800 BTU/h rated cooling with 23.5 SEER2 efficiency and pairs it with Hyper-Heating performance for low-ambient comfort. With R454B refrigerant and an INVERTER twin rotary compressor, output modulation supports consistent temperature control while matching real-world loads. Wi‑Fi Comfort app control, the 3D i-see Sensor, and multiple controller options provide flexible control pathways for homeowners, property managers, and installers. Indoor airflow up to 720 CFM (cooling, dry) and Dual Vane distribution support large rooms and open layouts where directional airflow matters. For cold-weather buyers, heating operation is specified down to -22°F with 100% heating capacity maintained at -10°F, backed by a built-in base pan heater. Whether purchasing direct or sourcing for projects, this bundled system combines published performance ratings, broad operating range, and feature-driven comfort control in a single SKU.

Key Features

• H2i Sumo Hyper-Heating INVERTER: Maintains 100% heating capacity at -10°F and provides guaranteed operation down to -22°F for cold-weather heating.
• 23.5 SEER2 and 10.5 HSPF2 (Region IV): Provides published seasonal efficiency ratings for both cooling and heating performance.
• R454B refrigerant system: Uses R454B with a factory charge of 3 lb 6 oz and supports up to 50 ft of pre-charged piping with 0.22 oz/ft additional charge beyond that length when required.
• 3D i-see Sensor: Scans room temperature and occupancy patterns to adjust airflow and temperature behavior based on detected conditions.
• Dual Barrier Coating and Dual Barrier Fusion: Reduces dust, smoke, oil, and fiber adherence on the heat exchanger and vanes to support airflow stability and easier upkeep.
• Comfort app Wi‑Fi control and controller options: Enables mobile scheduling and mode control, plus includes a back-lit handheld remote and supports wired, wireless, and third-party interface options.
• Air distribution and filtration: Dual Vane airflow direction control pairs with Triple Action Filtration using microparticle and electrostatic enzyme filters with an optional carbon-based deodorizing filter.