Air handler OA-ZK Series

marinefor ships

The OA-ZK Series is a seawater-cooled unitary air handling unit designed for marine and commercial large-space cabins, integrating dust filtration, cooling, optional heating and humidification. The unit can supply heating when seawater temperature exceeds 3°C and supports mixed fresh/return air intake with adjustable dampers for controlled ventilation.

Principle:

• The OA-ZKH unit comprises a compressor, condenser, expansion valve and evaporator configured for seawater heat exchange.
• Seawater cools the condenser/heat exchanger to provide cooling and dehumidification of circulating air.
• When seawater temperature is above 3°C, the system can operate in heating mode using the heat-pump circuit.
• Fresh-air and return-air inlets with dampers allow precise mixing and regulation of ventilation rates.

Features:

• Integrated floor-mounted construction for simplified installation aboard vessels or in large compartments.
• Primary frame-type filter for straightforward replacement and maintenance.
• Built-in refrigerant solenoid valve and thermostatic expansion valve for reliable refrigerant control.
• Variable-speed fan with VFD to adjust airflow and outlet static pressure to match duct resistance.
• Centralized supply and return arrangement enabling up to 100% fresh-air operation during transitional periods.
• Air treatment functions: dust filtration, cooling, optional heating and optional humidification.

Related submodels and parameters:

• OA-25ZKH — Btu/h: <96000 — Power: AC380V/50Hz/3Ph — Cooling input power: -- — Heating input power: --
• OA-35ZKH — Btu/h: 96000-720000 — Power: AC380V/50Hz/3Ph — Cooling input power: -- — Heating input power: --
• OA-50ZKH — Btu/h: 96000-720000 — Power: AC380V/50Hz/3Ph — Cooling input power: -- — Heating input power: --
• OA-70ZKH — Btu/h: 96000-720000 — Power: AC380V/50Hz/3Ph — Cooling input power: -- — Heating input power: --
• OA-105ZKH — Btu/h: 96000-720000 ("105" denotes ~105 kW cooling/heating capacity) — Power: AC380V/50Hz/3Ph — Cooling input power: -- — Heating input power: --
• OA-180ZKH — Btu/h: 96000-720000 — Power: AC380V/50Hz/3Ph — Cooling input power: -- — Heating input power: --

Technical details and options:

• Electrical supply: 380V / 50Hz / 3 Phase standard across listed submodels.
• Fan control: Variable Frequency Drive (VFD) for stepless speed regulation and outlet static pressure control.
• Operating modes: Ventilation, Cooling, Heating (optional), Humidification (optional).
• Heat exchanger: hydrophilic aluminum fins standard; copper tube options available.
• Optional accessories: galvanized steel or aluminum alloy fresh-air and return-air dampers; electric heater; Celdek or electrode humidifier.
• Applicable cooling-water (river/lake/sea) temperature range: 3°C to 35°C.

Installation and typical marine applications:

• Floor-mounted unit connecting to supply, return and fresh-air ductwork; suitable for large ship cabins, machinery spaces with ventilation needs, terminals or shore-based large-volume compartments.
• Designed for integration with shipboard seawater circuits and centralized ventilation systems.
• Maintenance access to filters, fans and control components is provided for vessel service routines.