A marine cabin unit – also described as a marine HVAC cabin unit, ship cabin unit, cabin air terminal or marine air terminal device – is a terminal air-distribution unit connected to a vessel’s central HVAC system. Sedina UAT Marine Cabin Units receive prepared supply air, distribute or regulate the required air volume and deliver it to the occupied space through a compatible UAD Diffuser. Depending on the selected configuration, the cabin unit may also provide electric, hot-water or water-glycol reheating.

UAT Marine Cabin Units are available with fixed or adjustable airflow control. In adjustable C, CE, CW and C2 variants, airflow adjustment is made from the UAD Diffuser using a diffuser-mounted control knob. The knob operates the airflow-regulating mechanism inside the cabin unit, providing local air volume control. This makes the adjustable UAT a marine cabin air terminal with adjustable airflow rather than a simple diffuser. The available airflow range and operating conditions depend on the selected model.

A fixed airflow cabin unit is commissioned to deliver the design air volume and remains at that setting during normal operation; no airflow-adjustment device is included in the fixed-flow unit. UAT, UAT-E and UAT-W families use fixed airflow. Adjustable UAT-C, UAT-CE, UAT-CW and dual-duct UAT-C2 variants use the UAD diffuser control knob to change the delivered airflow or, in dual-duct operation, the warm/cold air proportion.

The control method depends on the HVAC configuration. With a fixed-flow cabin unit and no local reheat, room temperature is controlled by the central air-handling unit. With electric or water reheat, airflow remains constant while the supply air is reheated and a room thermostat controls the heating function. With an adjustable single-duct cabin unit, room temperature can be controlled by changing the airflow rate while supply-air temperature remains equal to the central HVAC supply temperature. In a dual-duct cabin unit, the UAD diffuser control knob adjusts the proportion of warm and cold supply air delivered to the room.

A single-duct cabin unit receives one supply-air stream from the vessel’s central HVAC system and distributes, regulates and, where applicable, reheats that air before delivery through the diffuser. A dual-duct marine cabin unit receives two separate supply-air streams, typically from a warm air duct and a cold air duct. The dual-duct terminal controls the proportion of warm and cold supply air locally. In Sedina’s UAT-C2 models, the same diffuser-mounted control knob is used for this warm/cold supply-air control.

Yes. UAT-E and UAT-CE configurations are electric reheat cabin units. Electric heating output is available up to 3600 W only where confirmed for the relevant model. The E and CE variants are therefore electric reheat cabin units – marine cabin units with electric reheaters. The catalogue specifies a 230 V AC, 50/60 Hz supply for reheating and over-temperature protection using a 60 °C safety switch with automatic reset and an 85 °C safety switch with manual reset. Electric heaters are designed for a maximum surface temperature below 200 °C. A TR-001X wall-mounted room thermostat is used in the documented electric-heater control circuits.

Yes. UAT-W and UAT-CW configurations are water reheat cabin units for connection to a vessel hot-water or water-glycol heating circuit. The range can provide water-based heating output up to 2700 W only where confirmed for the relevant model and operating conditions. A room thermostat can control the heating demand, and a zone control valve is available for water-heating systems. Selection of a marine cabin unit with a water reheating coil or water-glycol coil must account for the required duty and the project’s heating-medium conditions.

Select the UAT size from the required design supply-air volume and then verify pressure, reheat and installation conditions. The documented model ranges are UAT-1: 50–200 m³/h, UAT-2: 150–350 m³/h and UAT-3: 250–500 m³/h. Because the ranges overlap, airflow alone does not determine the final model. The marine HVAC engineer should also check supply-air conditions, available duct pressure, control method, heating duty, duct arrangement, ceiling space, material.

The documented UAD Diffuser sizes are DN200 and DN250. UAD DN200 is matched to UAT-1 and UAT-2 cabin units, while UAD DN250 is matched to UAT-3. The UAD Diffuser is a distinct system component in the product nomenclature, but the catalogue identifies the corresponding diffuser as included with the UAT arrangement. The current quotation and documentation package should state the exact supply scope for the selected model.

The supplied catalogue text states that Sedina UAT Cabin Units are approved for use within the certified B-15 ceiling arrangement in accordance with the applicable MED type-approval requirements. The B-15 classification applies to the complete tested assembly and to installation in the approved configuration, including the approved construction, materials, mounting arrangement and installation details. For a marine cabin unit specification or RFQ, the exact model, configuration and installation scope should still be checked against the current certificate before the product is described as MED approved for a specific project.

Provide the vessel or project type, room application, required airflow, available duct pressure, supply-air conditions, single-duct or dual-duct arrangement, fixed or adjustable airflow preference, reheat duty, casing material, diffuser requirement, electrical or water reheating mode, certification requirement and project stage. For Sedina UAT Marine Cabin Units, this information allows the engineering team to confirm the model, UAD Diffuser, heating option and quotation scope.