General
Specially designed to operate in tough marine environments, Isotherm Cruise refrigerators 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 efficiently
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 Cruise 36 refrigerator is fitted with a manually operated, infinitely-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 inside the fridge in the upper right corner and allow setting within
normal refrigeration temperatures.
Defrosting
Defrosting shall be made when the frost layer is more than 4 mm thick. Set the thermostat in
OFF position. 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 fridge is completely
defrosted and dried.
Maintenance
The Isotherm fridges have a fully hermetic closed cooling system and do not require any
maintenance or refilling of refrigerant. The compressor is of domestic type and has a very high
efficiency and an outstanding life-time. The refrigerator 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 door,
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 10.4 V 11.7 V
24 V 22.8 V 24.2 V
