If you are new here you might be asking yourself what is the JEC Combi ??
The JEC Combi is a water-cooled multiple condensing unit for use in the marine environment. It combines all the things you need to install in one neat, self-contained package for a boat in the 45 to 100 foot (14 – 30 m) range, where reliable refrigeration, air-conditioning and freezer needs have to be met. In the case of larger vessels, multiple Combi units can be used. It is capable of delivering 12 to 14kW of refrigeration power per condenser unit or up to 42 kW combined. The Combi unit is extremely compact, eliminating the duplication of motors and pumps inherent in individual installations.
• Rugged construction for high vibration conditions;
• Corrosion protected construction for marine and severe industrial installations;
• Load management technology for high efficiency and minimum peak power needs.
• Installation Costs
• Genset Size
• Servicing Costs
OK! Let’s continue on from Part 3 then..
In the photo below all suction accumulators with transport oil separators are in place together with suction return valves. The valves are designed to separate the system from the evaporative part of the installation. In the case of a leak, it’s easier to determine the leaky part of the system.
In the photo below all the suction accumulators are in place together with the transport separators together with the suction returns valve that can completely close the entire system from the evaporative part of the installation in the case of a leak.
Below all heat exchangers are in place. The rear plate with 4 screws serves as a maintenance lid for cleaning cooling tubes with a long brush from barnacles and thus there’s no need for replacement of other types that are not cleanable.
Below the unit is complete! The COMBI VI system is tested prior to installation with water circulation and overpressure 30Bars and vacuum. It’s left under pressure and vacuumed for 24h each day. When passed the unit is filled with dry nitrogen or argon. It took more than 2 years before this unit was commissioned, typical delay in this type of restoration. When I asked the master installer, Noel Thomas of Cool Factor if the unit was still under pressure both of us were surprised that due to the amount of handling and moving there was no loss of pressure!
In the photo below, the larger box with the Red & Green indicators is a COMBI VII Booster. The function of the equipment is to rectify a single-phase 220VAC/50Hz To 400VDC. This seems to be a simple process however a team of engineers many years ago spent a considerable amount of time to make this process as efficient and safe as possible.
The heart of this process is a very complex, and dedicated integrated circuit that takes care of the rectification via a system called Power Factor Correction (PFC).
In simple terms, the system monitors the 50Hz sign wave in such a manner in order to keep the Power Factor at its optimum thus allowing more useful single-phase power to feed the COMBI VII system. (more bang for buck). In the following articles, JEC will explain how this 400VDC power is used in our own designed and manufactured Brush less motor.
Below in the background the newly installed JEC COMBI is finally mounted into the Margaret Pearl!! – Photo ( Paul Jindra ) Thanks for joining us for part 3 of the Margaret Pearl COMBI VII installation story – If you have any questions or are interested in getting in touch, don’t hesitate and reach out via our contact form below