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Isotherm 4701 ASU Magnum Water Cooled Refrigeration Component System
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Isotherm 4701 ASU Magnum Water Cooled Refrigeration Component System

  • Maximum Box Volume (cu ft): Fridge: 8.5 (No Freezer)
  • Power: 12 / 24 Volt DC, Sea Water-Cooled / Pump Included
  • Large Holding Plate Dimensions: 15.7" x 12.6" x 3.6"
  • Item #: 
    Model #: 


    Shipping Weight: 
    47.40 Lbs.
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    Status:    null In Stock

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    Indel Webasto Marine Product Catalog

    The Sea Water-Cooled ASU, (Automatic Start Up*) Magnum Model 4701 Refrigeration System can cool as a refrigerator or as a freezer. The maximum freezer capacity is 2.8 Cubic Feet and the maximum refrigerator capacity is 8.5 cubic feet. This model Includes a Self-Priming Sea Water Pump that ensures extra high efficiency for tropical applications. Isotherm's ASU Models are equipped with the optional, patented Automatic Start Up System that senses when surplus power is available and stores refrigeration energy in holding plates mounted near freezer compartment. The ASU system can dramatically reduce the drain on your battery.

    Isotherm Magnum Features:
    • Included Self-Priming Sea Water Pump ensures extra high efficiency for tropical applications
    • 12/24 Volt DC Danfoss Compressor
    • Easy installation with pre-charged system, "Click-on" bracket and quick connect lines
    • Variable speed water pump adjusts water volume according to the temperature of the compressor

    * Isotherm ASU Systems are designed for installations in existing cool boxes and mainly for use in sailing yachts where battery power is at a premium. The ASU system dramatically reduces power consumption while supplying refrigeration in abundance. It senses when surplus power is available from the engine alternator and speeds up the compressor to rapidly freeze the holding plate. When surplus power is no longer available it reduces its energy-use accordingly. The stainless-steel holding plate can be fitted at any suitable angel high up in the box before being connected to the compressor unit by the three meter long six mm diameter flexible copper piping fitted with quick-couplings. The compressor unit is small enough to be fitted in a stowage within connecting distance from the holding plate. Extremely quiet when running, it can even be fitted under a bunk if needed. After connecting the leads to the battery, the pre-filled system is ready to go.

    Isotherm ASU 4701
    Maximum Box Volume cu ft.
    Large holding plate
    Dimensions evaporator
    A x B x C inches
    Dimensions compressor
    L x W x H inches
    Power Consumption (Amp)
    Average A/hour/
    Max by 12 V
    Weight (lbs.)
    Danfoss Compressor Model
    Temp Range

    Isotherm has a 5-year limited warranty on all compressors. All other parts are covered by a two-year limited warranty with one-year warranty on labor.

    Documentation available at the following links:

    Isotherm AC / DC Voltage Converter
    Item #: 400511
  • Input: 110 Volt AC, Output: 24 Volt DC
  • Transforms AC Power into DC Power for the Compressor
  • This Unit is Not Compatible with Isotherm's Smart Energy Controller
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    Model #:
    SHURflo Swivel Nut Strainer
    Item #: 501675
  • Port: 1/2" Male NPS In, 1/2" NPS Female Out, Material: Clear Plastic
  • Dimensions: 3-1/2" H x 4" W
  • Filter Basket: 50 Mesh T304 Stainless Steel
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    SHURflo Swivel Nut Strainer
    Item #: 503643
  • Inlet: 1/2" Barb Straight, Outlet: 1/2" NPS Female, Material: Clear Plastic
  • Dimensions: 3-1/2" H x 4" W
  • Filter Basket: 50 Mesh T304 Stainless Steel
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    Model #:

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