Here are a few tips that I hope will help you to diagnose or correct a problem with your system.
Green, grimy growths and various sea creatures can lower the performance of your refrigeration system! Check and clean out your sea-water condenser at least once a year.
Tighten those caps!! 30% of all lost refrigerant complaints are caused by improperly installed service connection caps.
Take care of those components! A refrigeration system can last 20 years or more if you provide a good environment for the components by following the guidelines below.
Keep them free from salt water exposure
Make sure that the electric compressor gets cooling from another area.
Keep the system moisture free!!
Keep it dry! When a refrigeration system gets moisture in it, and a simple filter/dryer replacement does not solve the problem. Then you might have to:
Put an ice bag on the filter and run the system for 20 minutes. This will double the amount of water captured in the dryer.
The best way to remove moisture is with a vacuum pump, if you have acess to one, but before you use it all the components in the system must be warmed to 75° F. At 90° F with 700 microns of vacuum, water can be boiled from most systems in an hour.
Your compressor can fail! The compressor pumps the refrigerant through the system, and although they are usually very reliable they can fail. You probably have a compressor failure if:
If you have trouble with your AC compressor restarting when it's warm, you are about to have a failure.
If your Danfoss Compressor draws more than 7 AMPS, you are about to have a failure
Unplug that expansion device! Expansion devices rarely fail but they can be plugged with debris or ice particles.
Don't bypass that high pressure switch! All water cooled systems should be equipped with high pressure switches to stop the compressor when higher than normal pressures are experienced. A good compressor can pump burst pressures of over 500 pounds.
Know what type of refrigerant and oil your compressor uses! Servicing with the wrong refrigerant or oil can cause your compressor to fail so keep a placard posted near the compressor to remind you.
A frost covered evaporator means that the refrigerant level is probably correct.
Your refrigerator should run between 4 and 6 hours per day operating in the cool Northwest. The cycling off & on will be determined by the volume of products in the box. The more food the fewer the cycles. If yours is running more, There are three things that are probably causing your problem.
1. A leaking door seal: To check: close the door on a thin strip of paper then try to remove the paper. Do this all the way around the door.
2. Insufficient condenser cooling: These units were designed for the RV industry where louvers in the RV exterior wall provided air flow, in at the bottom and out at the top. If your unit is located in a cabinet, that provides no air movement across the back where the condenser is located, you would need to modify the cabinet to provide the adequate flow of air. The addition of a small 12 volt fan will also provide improvement.
3. Lost of refrigerant: You can check this by observing the accumulation of frost on the evaporator inside the box. The amount of frost is not critical in this test, but it's where the frost is located that is significant. Let the unit run 10-12 hours on high. If there is a skim coat or more on the entire evaporator surface, the refrigerant charge is probably correct.
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