2. Operation
The refrigerators are made for use at
ambient temperatures between 0°C/32°F
and +42°C/107°F.
2.1 Temperature regulation thermostat
The refrigerator is fitted with a manually
operated 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, 0-position. A
certain spring resistance is recognized at the
off position. It is advisable to start with the
thermostat in a medium position. It is
advisable to keep a temperature of 5-6°C/ 41-
43°F inside the refrigerator. Higher
temperatures will reduce storage time. The
ambient air temperatures also influence the
temperature inside the fridge. Avoid direct
sunshine and other heat sources close to the
refrigerator. The thermostat control knob is
placed inside the refrigerator.
2.2 User tips
- Load the food inside the refrigerator in such
a way, air can circulate to equalize the
temperature.
-Do not cover the shelves with glass, paper
etc.
-To reduce the amount of ice building
up in the evaporator, cover all liquids
and moist food.
-Let all hot foods cool well before putting them
into the refrigerator.
2.3 Defrosting
The evaporator is working on below freezing
temperatures and will form frost and ice from
humidity in the air. The humidity increases
with higher outside temperature, with storage
of non sealed fresh food and liquids and the
time the door is kept open. Defrosting shall be
made when the frost layer is more than 4 mm
/ 1/8” thick. Set the thermostat in OFF position
or switch off on the ASU control panel. Store
the foodstuff and the liquid as cold as possible
during the defrosting process.
Do not use sharp metal tools to remove frost or
ice. Do not re-start until the refrigerator is
completely defrosted, cleaned and dried. Empty
and clean also the plastic drip tray below the
evaporator. Place towels in the bottom of the
refrigerator to collect melt water.
3. Maintenance
The Isotherm DR Refrigeration systems
have a fully hermetic closed cooling system
and do not require any maintenance or
refilling of refrigerant. The compressor is of
mobile 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 may 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 sharp tools. Keep the cabinet
inside clean. Use lukewarm water and a
mild detergent for cleaning the inside. Put
the doors, during not in operation periods,
in their slightly open ventilation position.
3.1 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 V Cut out V Cut in V
12 9.6 (10.4) 10.9 (11.7)
24 21.3 (22.8) 22.7 (24.2)
If the bridge between C and P is cut off,
values within the () are valid.
4 Installation instructions
Many boats have a space which is intended for
a fridge. The Isotherm Cruise fridge has been
designed to suit the general dimensions
normally used for this purpose. The compressor
should normally stand upright in the boat, but
will operate at an angle of heel up to 30° and for
short periods even more. The INOX type
refrigerators have a flush mounting frame, three
side frame, as standard.
