Dometic marine air conditioner manual -

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- Dometic marine air conditioner manual

 

Nothing beats a summer retreat on your boat. But an ailing marine air conditioning system can spoil the fun and force you to a nearby hotel. Before troubleshooting your marine air conditioner or any other equipment, read and understand the user manual. The manual explains the things you can check in the system and the correct troubleshooting procedure. It can also be a tripped circuit breaker or blown a fuse, which will need a replacement. Check that there are no loose or disconnected wires or other voltage supply issues.

Check that the AC water pump is working as it provides cooling water to allow the unit to operate properly. Either the vents are insufficient, or the existing ones are blocked.

Clean the existing duct system or increase the vents for adequate airflow. Check the minimum number of vents the system requires for optimal performance and upgrade as required. It can also be because of obstruction of the return air. Remove any blockage and clean the air filter to improve ventilation.

The fan can cause a freezing evaporator is not running efficiently or being damaged. Check to see that the fan is running properly. A leak can also lead to a frozen evaporator as it reduces the level of coolant. For this, you need a professional to find and seal the leak and refill the Freon. An improperly located thermostat may also have difficulty gauging the actual cabin temperature, leading to this problem. In that case, move the thermostat for correct operation.

This issue occurs when the high-pressure switch, i. The main cause of this issue is restricted airflow and can be corrected by removing the obstruction. Increase the air grilles and remove any obstruction to the ventilation. Turn off the power and check for loose electrical connections in the electrical box. Check to see whether the reversing valve sticking produces a hissing noise when you tap it with a screwdriver during operation.

The wire on the reversing valve solenoid might be loose or worn. Replacing the connection might solve the problem. The first step is to clean and clear the pan drain nipple of any debris that might restrict the flow of water. Reassemble in case of misalignment and replace if it has extensive kinks. The AC unit may not be elevated enough for the water to leave the pan nipple. Raise the elevation to restore flow.

You can clean the filter, but extensive clogging will need a replacement. The thermostat should be in an off position. Inspect the raw water strainer and flush if dirty or clogged.

Check for disconnections and reconnect or replace any loose or worn cables. An internally short pump can also cause the problem.

To check this, disconnect the pump power and start the AC. It can also be because of a short circuit in the compressor, and this requires a replacement by a professional. But this may prove difficult based on the model and your experience. This problem occurs when the high-pressure switch is triggered while the AC unit is operating in Cool mode. Kinks in the hoses, debris, and clogged lines to the seawater pump can restrict the flow of water.

Flush the unit with a pressure pump if it is blocked. Replace or service the seawater pump if it is failing and change kinked hoses. Locate the leak and refill the coolant. A professional will be required for this. Poor or damaged insulation can reduce cooling. The proper position of the thermostat is not near the evaporator discharge.

A hatch or window might be open. Check your boat for any spaces that can allow warm air into the cabin. Clogged air conditioning condenser coils can make your boat unbearably hot. If this is the problem, clean the system for improved airflow. Over time, excessive amounts of materials in the sea strainer that acts as a barrier between the water and the thru-hull can cause a blockage. Make sure the thru-hull, sea strainer, and valves are working perfectly.

Remove accumulated growth and move the valves frequently, especially if the boat will be left in the water for extended periods. This pump provides the freshwater that cools the AC unit, preventing it from overheating. If the boat planes or the waterline changes, it can leave the pump out of the water, preventing it from performing optimally. The entry of large particles, critters, and debris can also make the pump noisy. When this happens, turn off the pump and the AC unit to allow it to cool.

Sometimes, the noise is because of friction, and some lubrication will stop it. Faulty bearings can also make the pump loud. If the AC pump is missing fins, has melted components, or worn bearings, replace it. However, the fan may become noisy to the point of being uncomfortable. If the fan has accumulated dirt and debris, has damaged bearings or worn belts, it will be loud. If you live in a place with humid summers and cruise on mosquito-infested waters, a working AC unit is a must.

Use these tips to keep your AC unit in excellent shape. The most important maintenance check for your marine AC unit is to ensure the water intake strainer is in excellent form.

Because the water flow passing through the strainer is nutrient-rich, critters and small marine life love to lodge in the space.

Look for damage, clogs, and anything which can obstruct the smooth flow of cooling water. It makes the evaporator dusty and decreases its heat-dissipating abilities.

Check for cracked and leaking hoses, broken, worn, and corroded clamps, and replace old components. A leaking hose is not only bad for your AC unit, but it can flood your boat and even sink it if you are running the system while the boat is unoccupied. Manufacturers recommend flushing the condenser coils to remove marine scum and scale every two to five years based on the frequency of use or location.

Make sure the pan is not corroded, as this can lead to leaking and will need a repair or replacement. We covered this at length in the troubleshooting section. An efficient air filter reduces the dirt and dust collecting on the evaporator coils, but you need to clean it after some time. Dusty evaporator coils are inefficient and will increase the strain on your unit.

Check your user manual for the correct way to clean the system or ask a professional to perform detailed maintenance. Unless you have a background in HVAC systems, there is a limit to what you can do with a troublesome marine air conditioner. A professional marine air conditioner technician has the requisite experience and up-to-date tools to perform in-depth diagnostic tests, repairs, and maintenance to bring your unit up to speed.

This option might be more costly than DIYing your maintenance, but it will save you time, effort and help you enjoy more quality time on your boat. But the unit can stop working without notice. This makes it imperative to know basic things to troubleshoot when your marine cooling system fails suddenly. At the end of this piece, you will know the basics to keep your air conditioner in top shape. Table of Contents. Was this article helpful? Click to share Did you find wrong information or was something missing?

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