Mitsubishi PEFY-L18NMSU-A 18,000 BTU Low Static Horizontal-Ducted Indoor Unit - R454B

Mitsubishi PEFY-L18NMSU-A – 18,000 BTU/H Low Static Horizontal-Ducted Indoor Unit
Deliver high-capacity, concealed comfort with the Mitsubishi PEFY-L18NMSU-A, an 18,000 BTU/H low static horizontal-ducted indoor unit engineered for quiet performance, flexible airflow control, and streamlined ceiling installations. Designed for residential and light commercial applications, this slim ducted solution provides powerful zoned comfort while maintaining a clean, unobtrusive interior appearance.

Powerful & Efficient Performance
The PEFY-L18NMSU-A delivers 18,000 BTU/H of nominal cooling capacity and 20,000 BTU/H of nominal heating capacity, making it ideal for medium-to-large spaces requiring dependable year-round climate control. Equipped with a high-efficiency 96W DC fan motor, the unit offers multiple airflow settings of 353, 441, and 529 CFM to match varying comfort demands and duct configurations.

Low Static Ducted Comfort with Flexible Air Distribution
Designed for low external static pressure applications, the unit supports adjustable static pressure settings of 0.02, 0.06, 0.14, and 0.20 in. WG. This adaptability allows for short duct runs, multi-room distribution, and concealed airflow delivery through supply grilles, helping maintain balanced temperatures without visible indoor equipment.

Quiet Operation for Occupied Environments
With sound pressure levels ranging from 30 to 37 dB(A), the PEFY-L18NMSU-A provides strong airflow performance while maintaining a comfortable acoustic profile. Its low-noise operation makes it suitable for offices, classrooms, conference rooms, and residential living spaces where performance and sound control must work together.
Compact, Ceiling-Ready Design
Despite its higher capacity output, this unit maintains a slim 7-7/8" height for low-clearance ceiling cavities. Measuring 39" W × 27-9/16" D × 7-7/8" H and weighing 53 lbs, it is engineered for efficient installation in both retrofit and new construction projects.

Built-In Condensate Management
The PEFY-L18NMSU-A includes an integrated condensate lift pump capable of lifting condensate up to 21-11/16", simplifying drain routing and increasing installation flexibility. A 1-1/4" O.D. drain connection ensures reliable condensate removal for gravity or pumped drainage configurations.

Smart Controls & System Compatibility
This indoor unit supports a wide range of advanced control options, including wired MA controllers, RedLINK® wireless remotes, third-party thermostat interfaces, and building automation connectivity via BACnet® or Modbus® with the appropriate adapters. Optional kumo cloud® Comfort App integration enables remote monitoring and control for modern, connected comfort management.

Reliable Refrigerant & Electrical Configuration
Designed for use with R454B refrigerant systems, the unit connects via a 1/4" liquid line and 1/2" gas line. It operates on 208/230V single-phase power with an MCA of 1.35 and MOCP of 15 amps, ensuring safe and dependable electrical performance within compatible Mitsubishi Electric systems.

Engineered for Concealed Zoned Comfort
Purpose-built for hidden ceiling installations, the Mitsubishi PEFY-L18NMSU-A combines higher-capacity performance with a compact, low-profile cabinet. Ideal for applications requiring powerful yet discreet ducted comfort, this low static horizontal-ducted indoor unit delivers efficient, reliable, and unobtrusive climate control for demanding residential and light commercial environments.