. ASU SP 3751 . 7.1 cf Fridge Holding Plate System with Water-Cooled Thru-Hull
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, itelligent energy management system which reduces battery consumption by 30 to 50 percent
Patented SP system - lower noise than a ventilated condenser & reaches a very low power consumption
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, holding plate, thru-hull, zinc, ASU control and click-on mounting bracket
Easy installation thanks to “click-on” system
Compact sea water cooled units - Self Pumping (SP)
Even on the hottest day the water-cooled Isotherm SP operates consistently at an extremely high level of efficiency. Without fans or pumps to remove the heat generated by the compressor, the SP system consumes much less battery power and is remarkably quiet.
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.)
7.1 Cu Ft.
Holding Plate: Medium
Amps Power Consumption: Max / Hourly *
6.0 / 0.5
Low Voltage Battery Protection:
8" L x 5" W x 6" H 204mm L x 127mm W x 153mm H
Holding Plate Dimensions:
14" L x 11" W x 2.4" H 356mm L x 280mm W x 61mm
37 LBS 17 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.