Our 1988 Pacific Seacraft
34 has a Kollmann Marine
Products refrigeration system. In the divided ice box is a holding plate filled with propylene glycol and water
. Also in the holding plate are two copper coils. The first coil is the evaporator for an engine drive refrigeration system consisting of a belt driven compressor
mounted on the engine, a coil for condensing the R134a with sea water
going to the engine, an assortment of pressure switches, and an expansion valve. The second coil is the evaporator for a 125v package R-12 condensing unit that is mounted at the back of the port cockpit
locker. Except for the common holding plate, the two systems are entirely separate. We run the engine drive system for an hour a day when we are away from the dock and the 125v system when we can plug
it in. We make ice and keep food
I believe the system was installed sometime just after the boat was built. With the help of Richard Kollmann's two refrigeration books
and with his email
responses to my questions on his web site, I have kept the two systems running since I bought the boat in 2004. The web site contains a wealth of information and the books
contain the sort of knowledge a journeyman refrigeration technician would share with an apprentince.
A similar currently sold refrigeration system is the Technautics Inc Global 12 system. It has a 12v condensing unit in place of the 125v unit that is in my system.