Mitsubishi PLA-AE42NL & PUY-AK42NL 42,000 BTU 21 SEER2 Four-Way Ceiling Cassette Cooling Only System (w/ Grille) - R454B

Mitsubishi PLA-AE42NL & PUY-AK42NL: 42,000 BTU Ceiling Cassette Cooling-Only System

The Mitsubishi PLA-AE42NL indoor cassette paired with the PUY-AK42NL outdoor unit delivers high-capacity, efficient cooling with 42,000 BTU of output, engineered for large commercial or residential spaces up to ~2,000 sq ft. Designed for lobbies, classrooms, retail stores, offices, restaurants, and other high-demand environments, this system provides powerful airflow distribution, quiet operation, and reliable cooling performance even in severe outdoor conditions.

The indoor cassette features Mitsubishi’s advanced 3D i-see Sensor®, scanning the room for temperature variations and occupancy while adjusting airflow and cooling output automatically for optimized comfort and reduced energy use. The unit includes individual vane control, swing-mode air distribution, multiple airflow levels, and a built-in condensate lift mechanism for easier installation. With a compact 33" × 33" ceiling footprint and clean appearance, it fits seamlessly into modern commercial ceilings while delivering up to 1,200 CFM for fast, even room cooling.

The PUY-AK42NL outdoor condenser uses an INVERTER-driven twin-rotary compressor for stable, efficient cooling. Designed for extreme environments, it provides low-ambient cooling down to –40°F (with wind baffles), 24-hour continuous operation, and robust Blue Fin and seacoast corrosion protection. This makes it ideal for coastal regions, industrial settings, and applications requiring year-round cooling performance. The heavy-duty outdoor unit is engineered for durability with anti-corrosion coatings, high-pressure protection, and rapid restart capability.

Though large in capacity, the system maintains quiet performance with indoor sound levels starting at 34 dB(A). It supports a full suite of control options—including wired and wireless remotes, third-party thermostat interfaces, and app-based control via the Comfort App—allowing flexible integration into any project. With ENERGY STAR® certification and high EER/SEER2 ratings, it delivers high efficiency and reduced operating costs for large spaces requiring heavy cooling.

General Information

System Type: Ceiling cassette indoor unit + single-zone cooling-only outdoor unit
Models: Indoor – PLA-AE42NL | Outdoor – PUY-AK42NL
Capacities: 42,000 BTU Cooling (Max 42,500 | Min 15,400)
Room Size: Ideal for ~2,000 sq ft
Operating Modes: Cooling Only (24-hour continuous operation)
ENERGY STAR®: Yes
Refrigerant / Factory Charge: R-454B, 9 lb 14 oz (pre-charged for 100 ft line length)

Key Features

INVERTER-Driven Compressor: Efficient, precise cooling control
Low-Ambient Cooling: Operates down to –40°F with wind baffles
3D i-see Sensor®: Advanced thermal and occupancy sensing
High Airflow Output: Up to 1,200 CFM for large-area cooling
Quiet Operation: Indoor sound levels as low as 34 dB(A)
Seacoast & Blue Fin Protection: Corrosion-resistant design for harsh environments
Smart Controls: Comfort app compatible, wired/wireless remotes, thermostat interfaces
Compact Cassette Design: 33" × 33" grille with integrated condensate lift

Specifications (Rated Conditions)

Cooling Capacity: 42,000 BTU (Max 42,500 | Min 15,400) | SEER2: 21 | EER2: 12
Electrical: 208/230 V, 1-Ph, 60 Hz | MCA: 34 A | MOCP: 56 A
Indoor Airflow: 740–1,200 CFM | Indoor Sound: 34–45 dB(A)
Outdoor Sound: 52 dB(A)
Piping: Liquid 3/8 in | Gas 5/8 in | Max line length: 225 ft | Max height: 100 ft
Outdoor Dimensions / Weight: 41-11/32 × 13-31/32 × 52-43/64 in | 224 lb
Indoor Dimensions / Weight: 33-1/16 × 33-1/16 × 11-3/4 in | 57 lb
Drain Connection: 1-1/4 in O.D.

Included Components

Indoor Unit: PLA-AE42NL ceiling cassette
Outdoor Unit: PUY-AK42NL cooling-only condenser

Ideal For

Large commercial or residential spaces needing powerful, efficient cooling with advanced airflow control and extreme low-ambient performance. The Mitsubishi PLA-AE42NL & PUY-AK42NL provides dependable, high-capacity cooling with smart comfort features and robust protection for harsh climates.