Your Marine Air Conditioning System

How to Maintain or Service Your Air Con

Proper maintenance of your air conditioning system is crucial for its long-term efficiency and performance. Below, we provide a comprehensive guide to help you maintain and service your air conditioning (AC) system, whether it's for a boat or any other marine application. We sat down with Jason Holden, the Service and Aftermarket Manager for Marine APAC at Dometic. With over 15 years of experience in the marine industry, where he began as a service technician, Jason has extensive expertise in refrigeration, air conditioning, and sanitation systems. 
  
1. Check and Clean the Sea Strainer

The sea strainer plays a vital role in ensuring clean water flows into your air conditioning system. Here’s how to maintain it:

• Regularly clean the strainer basket, ensuring it's free of growth and debris.
• Inspect the water flow to the strainer and check the operation of the thru-hull handle.
• The handle should effectively shut off the water supply when needed.
• Prime the system when reassembling to avoid airlocks.
• Inspect for any potential leaks in the system.

2. Inspect the Sea Water Pump

The sea water pump is a critical component that ensures efficient cooling. To maintain it:

• Verify the pump runs efficiently without overheating.
• Check for good water flow through the strainer lid and ensure there's sufficient water flow overboard.
• Inspect the pump, fittings, hoses, and shaft seals for leaks.
• Examine the condition of the impeller.
• If multiple air conditioning units are installed, ensure each can independently activate and operate the pump.

3. Assess the Condition of Air Con Units

Properly functioning air con units are the backbone of any cooling system. Key steps include:

• Inspect the units for signs of oil leaks, sea water corrosion, or standing water in drain pans.
• Check the copper piping and foam insulation for any signs of damage or wear.
• Ensure the bonding points and electrical cables are intact and in good condition.

4. Clean Ductwork and Return Air Filters

Air circulation is essential for optimal air conditioning performance. Maintain the system by:

• Regularly cleaning the return air filter, which can be vacuumed or rinsed in the opposite direction of the air flow.
• Allow the filters to dry thoroughly before reinstalling them.
• Check that the ductwork is not restricted by tight bends or external pressure, and ensure the insulation around the duct is intact.

5. Check Controllers and Operation Settings 

A well-calibrated controller ensures the air conditioning system maintains the desired temperature. Make sure to:

• Verify that the set point and room temperature settings are correct.
• Ensure that during cooling, the system shuts off once the set point is reached and the same for heating.
• Calibrate the room temperature settings to ensure accuracy.

Why is Regular Maintenance Important?

Routine maintenance of your air conditioning system not only extends its lifespan but also improves energy efficiency, reduces the likelihood of costly repairs, and ensures optimal performance. A well-maintained AC unit provides consistent cooling and heating, keeping you comfortable year-round.

Maintaining your air conditioning system doesn’t have to be a daunting task. With these simple yet essential steps, you can ensure that your AC operates at peak efficiency. If you're unsure or notice significant issues, it’s always wise to consult professionals like Jason Holden and the Dometic team for expert servicing and advice.

About Jason

Throughout his career, he has worked in sales and aftermarket support, ensuring high-quality service for Dometic products. At Dometic, Jason now manages aftermarket and service operations, focusing on enhancing customer satisfaction and expanding service offerings. With his deep knowledge, Jason shares essential tips for maintaining and servicing your air conditioning system to ensure longevity and optimal performance.