⚓ Working on this equipment?

Ask the AI troubleshooter, log your hours on board and turn them into invoice-ready service reports — for this exact model.

Start free — 14 days →

No credit card required

🔧 21 verified suppliers & service companies for Daikin Marine in the Maritime Network Find suppliers →

Is Daikin Marine your company? Claim this page

Daikin Marine

FWN Self-Contained 75kW R134a

Name: Daikin Marine FWN Self-Contained 75kW R134a
Brand: Daikin Marine
SKU: OSE-108333

Daikin Marine FWN Self-Contained 75kW R134a — Air Conditioning.

Inspector Detail

▸

Common issues

Refrigerant leakage at flare/brazed joints, gradually reducing cooling capacity
Seawater-cooled condenser fouling/scaling, raising head pressure and reducing heat rejection
Compressor short-cycling from low refrigerant charge or a faulty pressure switch
Evaporator coil icing from low airflow or low refrigerant charge
Seawater pump/strainer blockage causing a high condensing pressure trip
Fan motor bearing wear causing noise/vibration in the air handling section
Control system sensor drift causing erratic temperature control

Inspection checklist

Check refrigerant charge/sight glass condition and leak-test the flare/brazed joints
Measure suction and discharge pressures against expected values for R134a at the current seawater/ambient temperature
Inspect and clean the seawater-cooled condenser tubes and strainer
Check compressor oil level (where a sight glass is fitted) and listen for abnormal noise
Verify safety cutouts (high/low pressure, motor overload) trip at the correct settings
Inspect the evaporator coil and filters for fouling or icing
Check fan motor bearings and belt/drive condition
Verify control panel readings against a reference thermometer/gauge

Service intervals

Filter cleaning/replacement	commonly monthly, or per maker schedule, more often in dusty spaces
Refrigerant leak check	annually, or at any sign of capacity loss
Condenser tube cleaning (seawater side)	annually, or sooner if fouling raises head pressure
Safety cutout function test	annually, as part of periodical survey

Critical spares

Compressor or compressor repair kit - Daikin-specific; confirm the exact spare with an authorised Daikin Marine service agent before ordering
Refrigerant filter drier
Condenser seawater pump seal kit
Fan motor
High/low pressure switches
Liquid line solenoid valve

Safety

R134a is a high-pressure refrigerant - use only rated recovery/charging equipment and avoid venting to atmosphere
440 V electrical supply - isolate and verify dead before opening the control panel
Rotating fan/belt hazards - guards must be in place before running with covers removed
Follow the vessel's confined space/ventilation procedure when working on refrigerant lines in an enclosed machinery space

Class survey

Accommodation/HVAC units generally sit outside strict statutory machinery survey scope unless the unit serves a safety-critical space (e.g., engine control room, battery space ventilation) - confirm applicability against the vessel's class notation before treating this as a survey item.

Estimated lifetime: Self-contained marine AC units of this type typically give 15-20 years of overall service, though the compressor itself often needs overhaul or replacement well before that (commonly in the 40,000-60,000 running hour range depending on duty and maintenance) - confirm against Daikin Marine's documentation for the FWN series.