. Magnum ASU 4701 . 8.5 cf Fridge Holding Plate System with Integral Water Pump
Holding plate stores cold to minimize run time
ASU technology detects when surplus power is available (engine, wind, solar, etc.) and freezes the holding plate at those times
ASU is a patented, intelligent energy management system which reduces battery consumption by 30 to 50 percent
Self-priming sea water pump to ensure extra high efficiency for tropical applications
Variable speed water pump according to the temperature of condenser
12/24 V Danfoss/Secop compressor. Known for it's durability, low noise and low power consumption
Universal kit AC/DC optional for a complete power supply compatibility (12/24 V, 230/115 V and 50/60 Hz)
Pre-charged system with quick-connect refrigerant lines
Includes: compressor, self-priming seawater pump, holding plate, ASU control and click-on mounting bracket
Easy installation thanks to "click-on" system
Compact sea water cooled units - Waterpump - Cooled (Magnum)
Isotherm Magnum uses the surrounding water to increase cooling efficiency. All Magnum models are fitted with integral seawater pumps for circulating the cooling water through the cooling section of the refrigerator compressor.
Installation is easy: simply mount the evaporator high in the box, connect the pre-charged plate and compressor, and connect power. Converting your old ice box into a modern refrigerator has never easier.
Once installed, the age-old hassle of hauling ice will be over! Isotherm specializes in dependable, energy-efficient systems which are backed by the exclusive Isotherm 5-year warranty on all compressors so you'll have the confidence of knowing you have purchased the best!
Isotherm ASU charges the holding plate while the engine is running. The patented ASU system has now been available for more than 30 years and has been installed on tens of thousands of boats worldwide. The ASU system starts the compressor when the engine is running and the power is available to freeze the holding plate completely. The energy stored in the holding plate will keep the refrigerator cool for many hours. When the engine is stopped, the compressor will not restart until the cold stored in the plate is all consumed. Once the stored cold is completely consumed, the compressor starts to run for short periods to maintain the required temperature in the box. With its unique principle of operation – the patented ASU “Automatic Start Up” system – Isotherm ASU has an important competitive advantage over traditional refrigerators.
ASU - Automatic Start Up This unique system is designed to start the compressor up to 75 % of its performance mainly when the engine is running and plenty of power is available. Using a powerful compressor (a three-phase compressor with full-range speed control) is highly recommended as it achieves a quicker freezing of the holding plate. By taking advantage of the surplus energy generated by the alternator when the engine is running, the ASU feature does not reduce the engine’s effectiveness.
Max. Box Volume Fridge (Cu Ft.)
8.5 Cu Ft.
Holding Plate: Large
Amps Power Consumption: Max / Hourly *
6.5 / 1
Low Voltage Battery Protection:
15" L x 8" W x 7" H 381mm L x 204mm W x 178mm H
14" L x 11" W x 3.6" H 356mm L x 280mm W x 92mm H
51 LBS 24 KG
5-Year limited on the compressor and 2-year on all other parts
*Power consumption figures for comparison purposes are listed as the amps consumed when running / average hourly consumption on 12 volt system with 42°F in the refrigeration space, ambient air temperature 72° F. and medium sized insulation.
** Refrigerator temperatures from mid-30's to mid-40's are proper refrigerator temperatures. Reduce the box volume by 10-20 %, in tropical conditions. Dual can operate both as a fridge or a freezer by setting the temperature with a special thermostat. Specification changes may be made without prior notice.