General
Specially designed to operate in tough marine environments, Isotherm fridge and freezer boxes are outstanding
in both performance and reliability. Fitted with a fully hermetic, leak-free compressor, they offer the lowest
possible power consumption and noise level. All models are extremely simple to install. They will operate at a
continuous angle-of-heel of up to 30° in all directions, for a short time even more. To ensure that your Isotherm
box operates as effi ciently as possible, please follow these general guidelines:
* Unnecessary opening of the lid will increase power consumption.
* Good ventilation of the compressor and condenser unit will reduce power consumption.
* The electrical system should be in good condition. Inspect batteries and charging levels regularly.
Always use a separate starter battery for the engine. Follow carefully the guidelines regarding
electrical cable areas and fuse placements.
* Keep the inside of the box clean and dry. Keep the lid slightly open to air the fridge
when leaving the boat for any length of time.
Operation
Temperature setting
The box is fi tted with a manually operated, infi nitely-variable thermostat. This is turned clockwise to reduce
temperature and anti-clockwise to both increase temperature and activate the on-off switch at the end position.
The thermostat knob is placed outside the box and allow setting within normal refrigeration temperatures between
+8°C and -14°C. A separate on-off switch is placed besides the thermostat knob.
Defrosting
Defrosting shall be made when the frost layer is more than 4 mm thick. Set the thermostat in OFF position
alternatively switch off by means of the switch. Store the foodstuff and the bottles as cold as possible during
the defrosting. Do not use sharp metal objects to remove frost or ice. Do not re-start until the box is completely
defrosted and dried.
Maintenance
The Isotherm boxes have a fully hermetic closed cooling system and do not require any maintenance or refi lling
of refrigerant. The compressor is of domestic type and has a very high effi ciency and an outstanding life-time. The
build-in box shall be left in the boat during the winter. (If the temperature is below freezing point, the compressor
will not start).
The maintenance is reduced to periodically, not less than a year, cleaning of the condenser from dust. Use a soft
brush and no hard objects.
Keep clean inside the box. Use lukewarm water and a mild cleaner for the inside. Put the lid, during not in
operation periods, in a slightly open ventilation position.
Battery voltage sensor
To protect the batteries from becoming completely discharged, a battery voltage sensor switches off the
compressor automatically at the following levels:
System voltage Cut-out Cut-in
12 V 10.1 V 11.4 V
24 V 22.3 V 23.7 V
Safety instructions
When connected to shore power, ensure that the power supply system is equipped with an automatic earth leak
switch. Danger!
Never tough bare electrical wiring connected to the mains supply. Danger!
Never connect battery charger direct to the refrigeration system. A battery charger must be connected to the
battery.
In addition to acid, a newly-charged battery contains explosive gas. Danger!
Never cover up the ventilation systems for the compressor unit.
The refrigeration unit must be disposed by a refrigeration specialist for correct recycling of components and care
taking of the refrigerant.
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