Defender Home Page
Phone: 800-628-8225 Fax: 800-654-1616 Int'l.: 860-701-3400 Email: Contact Us
follow me on facebook
Shipping Info
no sales tax Defender Home Page
Your Cart

View Cart View Shopping Cart
Check My Order(s)
Track My Package(s)
Conversion Chart
Shopping Areas
Boats & Motors
 Defender Seal

Isotherm 3201 ASU Air Cooled Refrigeration Component System

  • Maximum Box Volume (cu ft): Fridge: 4.4 (No Freezer)
  • Power: 12 / 24 Volt DC, Fan-Air Cooled
  • Small Holding Plate Dimensions: 11.8" x 8.25" x 2.4"
  • Item #: 
    Model #: 
    Shipping Weight: 
    30.80 Lbs.
    List Price: 
    Our Price:
    Status:      In Stock


    Indel Webasto Marine Product Catalog

    The Air Cooled ASU (Automatic Start Up*) Model 3201 Refrigeration System can cool as a refrigerator or as a freezer. The maximum freezer capacity is 1.4 Cubic Feet and the maximum refrigerator capacity is 4.4 cubic feet . 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 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 Air Cooled Features:

    • Fan-Air Cooled
    • 12/24 Volt DC Danfoss Compressor
    • Easy installation with pre-charged system, "Click-on" bracket and quick connect lines
    Isotherm ASU 3201
    Maximum Box Volume cu ft.
    Small holding plate
    Dimensions evaporator
    A x B x C inches
    11.81 x 8.25 x 2.38
    Dimensions compressor
    L x W x H inches
    10.63 x 6.31 x 6.13
    Power Consumption (Amp)
    Average A/hour/
    Max by 12 V
    Weight (lbs.)
    Danfoss Compressor Model
    Temp Range
    WARNING: This product MAY expose you to chemicals, which are known to the State of California to cause cancer, birth defects and/or other reproductive harm. For more information go to


    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.

    Isotherm 3251 ASU SP Water Cooled Refrigeration Component System
    Item #: 401772
  • Maximum Box Volume (cu ft): Fridge: 4.4 (No Freezer)
  • Power: 12 / 24 Volt DC, Sea Water-Cooled / Self Pumping
  • Small Holding Plate Dimensions: 11.8" x 8.25" x 2.4"
  •  Include

    Model #:
    Isotherm 2351 Compact SP Water Cooled Refrigeration Component System
    Item #: 401774
  • Maximum Box Volume (cu ft): Fridge: 5.3 or Freezer: 1.8
  • Power: 12 / 24 Volt DC, Sea Water-Cooled / Self Pumping, Max Draw: 3.5 Amps
  • Medium "O" Evaporator Dimensions: 13" x 4" x 9"
  •  Include

    Model #:
    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
  •  Include

    Model #:

    Have A Suggestion?

    Help us make our site better for everyone! Let us know you've found something wrong or frustrating on this page and we will improve it. Please mark each that apply.

    Product has been improperly categorized
    Page loads too slowly
    Product information is incorrect
    Page has errors or bugs
    Site is frustrating or difficult to use
    Product image is missing or wrong
    Cannot find my size
    Spelling errors on page
    Not enough product information

    Comments or Examples:
    Examples: Missing information such as dimensions and model number, typos, inaccuracies, etc...

    Please include your e-mail address below if you would like us to respond to your comments or questions.             

    Join Our Email List And Receive our Monthly Promotions
    Defender Email Specials
    Click Here For Our Privacy Policy