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ISOTHERM 3201 ASU /
3701 ASU
Operating and installation
instructions.
General
ISOTHERM 3201/3701 "ASU - Automatic
Start Up" is a modern refrigeration system for
sailing yachts and motor cruisers. It is
designed to generate low refrigeration
temperatures even in hot conditions while at
the same time consuming an absolute
minimum of battery power. This is achieved
by using a patented electronic control
system, which runs the refrigeration
compressor at 75 % higher speed when the
boat's engine is running. This, in combination
with a holding plate inside the refrigerator,
stores the refrigeration energy produced for
long periods.
The easy do-it-yourself installation requires
no connections to either the engine or its
cooling system.
This manual is also valid for 3251 & 3751
ASU SP together with the separate SP
installation instructions.
The following points are important if good
results are to be achieved.
Refrigerator box
To retain as much cold air as possible when
opened, a top-loading box is usually
preferable to a side opening one.
A most important factor in achieving good
results is that the refrigeration box is well
insulated. Expanded or cross-linked
polystyrene or polyurethane insulation
material should be used. Recommended
minimum thickness (multiply by 3 for freezer
boxes): 30 mm for a 50-litre box, 50 mm for a
100-litre box and 75 - 100 mm for larger
boxes. If space is available use thicker
insulation around the lower part of the box.
A moveable partition should be installed in
the box to allow the frozen food section
surrounding the cold plate to be reduced to
the smallest space possible so that the
correct temperature of 4 - 6° (39 - 43°F) can
easier be maintained in the refrigeration
section.
The lid must also be insulated but more
important that it fits tightly into the opening.
If a water drain is fitted in the bottom of the
box, this must always be closed during use to
avoid cold air from running out and warm,
damp air entering.
Electrical system
An electrical system that is both correctly
dimensioned and in good working order is
required. This is especially important if the
refrigeration system is to operate continuously
for a few days during warm weather and not
have to start the engine for charging.
Calculate the boat's total power requirements.
The engine should always have a separate
battery for starting. In addition to the battery
capacity required by other electrical
equipment onboard, one extra 75 Ah battery
will be sufficient for the refrigeration power
supply. In addition to increasing the amount of
"standby-power" available onboard, the extra
service battery can also store surplus power
when this is being generated by the engine.
Two batteries can, of course, accept twice the
amount of charge. The alternator is normally
not a limiting factor.
All service batteries must have generously-
dimensioned cables for both positive and
negative circuits if they are to receive full
charging voltage from the alternator.
Using the refrigerator
Power consumption is dependant to a large
degree on how the refrigerator is
used.
Let refrigerated food remain inside the fridge
as far as possible and take them out only
when required. Don't leave them out of the
fridge longer than absolutely necessary when
cooking or having your meal. Replace them as
quickly as possible.
Avoid placing warm food in the fridge. If
possible, use an insulated thermal bag when
carrying frozen or chilled foodstuffs from home
or the shops.
Let the engine run a few minutes extra when
leaving and entering harbour. The engine
alternator will then supply an extra boost of
refrigeration energy just when needed, i.e.
immediately before "no-power" periods of
sailing and in harbour.
Refrigeration temperatures
The correct temperatures for storing sensitive
foodstuffs such as meat, fish, milk, etc. are as
follows:
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