Skip, Unfortunately all manufacturers of boat icebox conversion units
have some items in their designs that cause unwanted problems. Pre-
charged refrigerant lines have always come with O rings to prevent
refrigerant loss during assembly. Ounce torque down a metal seal
permanently prevents line connector leakage but Frigoboat relies on O
ring seals only to retain refrigerant. There are many applications
where O rings are used to prevent leaks. Now you are finding out why
spare O rings come with new Frigoboat units and also why at boat shows
they demonstrate how to change Orings. What you must find out for
yourself is the difficulty in re-commissioning systems after replacing
a refrigerant line O ring. When reliability and safety is demanded
from O rings shelf life of new rings is limited to one year. I read on
another forum where there was a discussion about replacing these
Frigoboat O rings every five years. My guess is that only one out of
ten refrigeration service technicians could add the correct amount of
refrigerant to your system.

Frigoboat’s refrigerant flow lines on keel cooler systems are simple.
There are three lines connected to compressor two on dome top and one
coming out of side. Line coming out of compressor’s side below welded
dome goes to keel cooler. Line out of other side of keel cooler runs
to evaporator. Return line from evaporator connects to one of the
lines coming out of compressor dome. Other line out of compressor dome
is short with the only refrigerant servicing connection on this system
There are three line connectors with O rings and no high pressure
servicing connection on a standard Frigoboat unit. Some installations
have optional line extensions that add more line connectors.

Yes there is a trouble shooting LED on the Smart Speed Control and it
will only flash when electronic control module senses an electrical
problem. Low cooling do to refrigerant loss will NOT trigger a signal
from troubleshooting LED.