Mitsubishi SLZ-AF15NL & SUZ-AA15NL 15,000 BTU 20.6 SEER2 Four-Way Ceiling Cassette Heat Pump System (w/ Standard Grille) – R454B

Mitsubishi SLZ‑AF15NL & SUZ‑AA15NL: 15,000 BTU Ceiling‑Cassette Heat Pump System

The Mitsubishi SLZ‑AF15NL 4‑way ceiling cassette paired with the SUZ‑AA15NL single‑zone outdoor condenser delivers an energy‑efficient 15 k BTU heating and cooling solution ideal for mid‑sized residential or light commercial spaces. Utilizing R454B refrigerant, an INVERTER‑driven compressor, and Pulse‑Amplitude Modulation (PAM) control, the system ensures quiet operation, precise comfort, and reliable performance across seasons.

Ideal for spaces around 650 sq ft, the system includes the required SLP‑18FAU grille and offers Wi‑Fi‑ready controls through Mitsubishi’s Comfort Cloud app. Its slim, recessed cassette installs discreetly in ceilings, providing even 4‑way airflow and enhanced flexibility with a built‑in 33″ condensate lift pump and optional fresh‑air intake for improved indoor air quality.

General Information

System Type: 4‑way ceiling cassette + single‑zone heat‑pump condenser
Models: Indoor – SLZ‑AF15NL (+ SLP‑18FAU grille) | Outdoor – SUZ‑AA15NL
Capacities: 15 k BTU Cooling | 18 k Heating (max 20 k BTU)
Room Size: Ideal for ~650 sq ft
Operating Modes: Heating & Cooling
ENERGY STAR®: Yes (SEER2 20.6, HSPF2 10.1)
Refrigerant / Factory Charge: R454B, 2 lb 6 oz

Key Features

INVERTER‑Driven Compressor – Modulates output for consistent comfort and energy savings.
4‑Way Vane Control – Even, customizable airflow across the entire room.
Built‑In 33″ Lift Pump – Simplifies condensate drainage above ceiling level.
Wi‑Fi Ready – Compatible with Mitsubishi Comfort Cloud for app-based control.
Ultra‑Quiet Operation – Indoor sound as low as 27 dB(A), outdoor max 54 dB(A).
Blue Fin Anti‑Corrosion Coating – Protects the condenser coil from environmental wear.
Fresh‑Air Intake Option – For improved ventilation and indoor air quality.
Optional 3D i‑see Sensor® – Adds occupancy and thermal mapping for adaptive comfort.
Hot‑Start Technology – Prevents cold air drafts when heating starts.
Compact, Discreet Design – Minimal visual footprint with a flush ceiling mount.

Specifications (Rated Conditions)

Cooling Capacity: 15,000 BTU | EER2: 12 | SEER2: 20.6
Heating Capacity @47°F: 18,000 BTU | HSPF2: 10.1 | COP (47°F): 3.3
Electrical: 208/230 V 1‑Ph 60 Hz | MCA: 14 A | MOCP: 20 A
Airflow (Dry): 245-405 CFM (cool & heat)
Sound Pressure: Indoor 27–39 dB(A) | Outdoor 49-51 dB(A)
Piping: Liquid ¼ in. | Gas ½ in. | Max length 65 ft | Max height 40 ft
Outdoor Dimensions / Weight: 31-8/16 x 11-4/16 x 21-11/16 in. | 81 lb
Drain Connection: ¾ in. O.D.

Included Components

Indoor Unit: SLZ‑AF15NL ceiling cassette
Decorative Grille: SLP‑18FAU (required)
Outdoor Unit: SUZ‑AA15NL heat‑pump condenser

Ideal For

Homeowners or light commercial users seeking a sleek, quiet, and efficient ceiling-mounted ductless system to condition medium-sized spaces such as bedrooms, conference rooms, or open living areas with modern remote control options and ENERGY STAR® savings.