2. Operation
The freezers are equipped with a standard mechanical
thermostat except for CR 90 Freezer which has an elec-
tronic thermostat.
Temperature regulation are similar for both systems.
The freezers are made for use at ambient temperatures
between 32°F and 113°F.
2.1 Temperature regulation thermostat
The freezer is fi tted 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 po-
sition. For maximum storage time of frozen food a suitable
temperature in the freezer is 1 to – 4°F. Higher
temperatures will reduce storage time.
For shorter time periods, 5 to 1°F is acceptable. The
ambient temperature infl uences the temperature also
inside the freezer. Avoid direct sunshine and other heat
sources close to the freezer.
The thermostat control knob is placed inside the freezer, in
the upper part to the right when opening the door.
Alternative positions of the
thermostat.
DR 55 Freezer INOX
3
- Start up the freezer if possible 6 - 8 hours before it
shall be loaded with frozen food.
- Load the food inside the freezer in such a way, air
can circulate to equalize the temperature.
- Do not cover the shelves with glass or paper etc.
2.4 Defrosting
The evaporator is working on 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 food and the time the door is kept open.
Defrosting shall be made when the frost layer is more than
1/8” thick.
Set the thermostat in OFF position or switch off a main
switch. Store the goods as possible during the defrosting
process.
Do not use sharp metal tools to remove frost or ice.
Do not re-start until the freezer is completely defrosted,
cleaned and dried. Empty and clean also the plastic tray
in the bottom. Place towels in the bottom of the freezer to
collect melt water.
3. Maintenance
The Isotherm refrigeration systems have a fully hermetic
closed cooling system and do not require any maintenance
or refi lling of refrigerant.
The compressor is of mobile type and has a very high
effi ciency and an outstanding life-time. The freezer 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. Release the catch
on the door for this purpose with a coin or a small
screwdriver (see fi g.) (Not valid for Stainless steel version,
“INOX”). Switch off a main switch if there is one installed
connected to the freezer power supply to avoid a small
power consumption of the electronic unit in its stand by
position.
2.3 User tips
- The freezer compartment is meant for storage of pre-
frozen food. It has limited capacity for quick or deep
freezing. In case of deep freezing, place the goods
as close as possible to the evaporator for best
effi ciency.
