JPC Direct

Two approaches to provide perfect coolness at any demand:
Indel Webasto Marine provides you with two product ranges of high-quality cooling units:

1) Compact
The Compact thermostat-regulated refrigeration unit uses a
Danfoss compressor to cool an evaporator fitted in your
refrigerator or deep freezer box.

The Danfoss compressors are even more power efficient. Hermetically sealed, they operate
in a mixture of oil and refrigerant which contributes to extremely quiet running and very
little fatigue of material. All compressors used for Isotherm applications run on a threephase
electric system, just as all other high efficiency electric engines.
The three-phase current is created in a small microprocessor. In this ”computer” Indel
Webasto Marine has been able to programme a number of functions which check and
control many of the unit systems. This allows achieving the lowest possible power consumption.
The same compressor is used for both 12 V and 24 V systems, and the electronic unit
is able to protect itself from accidental reversal of the voltage polarity.

2)ASU
The intelligent refrigerator charges the holding plate while
the engine is running by means of the patented energy management
system.

The ASU technology detects when a surplus of power is available, uses this power to freeze the cooling plate which consequently stores the cold for times, when no power is available for cooling purposes. A high-quality Danfoss compressor builts the core of the patented ASU ”Automatic Start Up” electronic control system. Together with the Isotherm holding plate they are an unbeatable combination.

How much power is needed?

This is the most frequently asked question of all. We can give exact power consumption figures for our range of refrigerators, freezers and boxes, as we know their size and quality of insulation. It is more difficult to quote a figure for self-installed refrigeration boxes as we do not know the exact size of the box, or even more important, the quality and thickness of the insulation material used. The power consumption figures given for a particular volume are therefore calculated for an insulation material of
medium quality and thickness. The average power consumption is given in watt/24 hours.

This video shows a basic overview of an installation

Three possible cooling systems
Indel Webasto Marine provides a wide range of cooling units to suit every demand. For an efficient removal of the heat, various methods can be applied. Isotherm cooling units use air or sea water to remove the heat.

Using air which is blown through the condenser by a fan is the traditional way to remove the heat.
It is important that the compressor compartment is well ventilated allowing cold air to enter from
below and hot air to escape to the top.

The Isotherm SP units use sea water to remove the heat. This method has the advantage that refrigeration efficiency is completely independent from the air temperature inside the boat. 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.
The Isotherm SP unit uses the movements of the hull to draw heat down and out through a special fitting in the galley sink drain hose. The flow is completely free inside the draining hose, so each movement of the surrounding water produces a similar quantity of water level inside the hose, which results in pumping an equivalent amount of water in and out. By designing a special hull fitting containing a non restricting, fullflow spiral heat exchanger for cooling the heated refrigeration agent, an extremely efficient cooling system is created.
As the hull fitting is situated away from the boat’s centre of gravity, the smallest movement of the hull or mast of sailing boat is sufficient to create a pumping action. This movement results in constant withdraw of warm water and intake of cold water which also prevents fouling.

■ Sea water cooling for even higher efficiency.
■ Lower power consumption.
■ Silent – no fan nor pumps.
■ Heat removed by water means cooler inside the boat.
■ No extra holes in hull required.
■ Simple to fit. Replaces the through-hull fitting for galley sink.

Isotherm Magnum units are especially designed for vessels with exceptionally high refrigeration
requirements, for example vessels sailing in tropical waters. Isotherm Magnum uses the
surrounding water to increase cooling efficiency.
All Magnum models are fitted with integral sea water pumps for circulating the cooling water through the cooling section of the refrigerator compressor. The pump is quiet, self-priming, withstands being run dry and is self-aerating. The highly efficient heat exchanger is manufactured in a corrosion-resistant copper-nickel alloy and fitted with a zinc anode. Sea water-cooled units are extremely efficient and offer increased cooling capacity.

Isotherm Magnum Twin
The Magnum Twin model is the biggest and most modern refrigeration unit in the range, using twice the compressor power as the smaller Magnums. By combining two Danfoss compressors, even the largest refrigerators (up to 500 liters) or freezers (up to 175 liters) work to capacity. For trouble-free
operation over long periods, the lubrication systems of both compressors are connected with an oil cooler to ensure continuous operation at full capacity even in tropical conditions.

The ASU cooling units are also available in air-cooled or sea water-cooled models.
Equipped with the patented ASU technology they offer an innovative engery management system to the user.