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Internal teperature of
refrigerated food
10°C (50°F)
8°C (46°F)
6°C (43°F)
4°C (39°F)
1°C (34°F)
The correct way to store refrigerated food is
to never allow its temperature to exceed 6°
(43°F). Switching off the refrigerator overnight
is a false economy and from a hygienic point-
of-view is not recommended.
MAIN COMPONENTS
ISOTHERM refrigerator systems consist of
three main components: the Compressor
Unit, the Holding Plate and the Control Panel.
Compressor Unit - (Fig. A)
The Danfoss BD35F and BD50F dual volt
12/24 type refrigeration compressor is of the
very latest design. It produces extremely high
refrigeration energy while consuming very
little battery power.
As it is driven by 12 volt 3-phase alternating
current, it has an unbeatable starting ability
and its speed and capacity can be regulated.
It is of the same totally hermetic design as
that of domestic refrigerators and has,
therefore, a long operating life, low sound
level, and is completely maintenance-free.
The piston-type compressor operates on a
mixture of cooling medium and oil. It is to be
fitted horizontally with its feet downwards but
it will operate at a continuous angle-of-heel of
up to 30° in all directions. Should this angle
be exceeded, the compressor will stop
automatically. It will re-start automatically
when the angle has been reduced.
The BD 35F compressor unit is integral with
the condenser, which is equipped with a fan
that also can be equipped with a connection
for an optional cooling-air hose kit. The
BD50F compressor is equipped with a
lamellar condenser having a hose connection
mounted.
Duration after which
food can become unfit
for consumption
1 day or less
1-2 days
2-3 days
5 days
5-7 days
The compressor unit is delivered pre-filled
with cooling medium and has irreversible,
quick-coupling connections on the ends of
the flexible piping which connects it to the
holding plate. These couplings can be
disconnected and re-connected should either
unit need re-positioning.
To simplify connecting up the system, the
electronic control unit mounted on the left
side of the compressor is fitted with tab-type
terminals for the positive and negative main
power cables; large modular (telephone type)
connectors for the 4 metre cable to the
control panel; and small modular connectors
for the 3.5 metre cable for the temperature
sensor on the rear of the holding plate. It
contains a micro-processor with programmed
functions for slow-running; speeding-up the
compressor when the engine is running;
battery monitoring for high and low voltage
(cut-out at 10/22.0 volt, cut-in 12/23.5 volt);
monitoring of compressor speed and power
consumption; regulating the holding plate
temperature and fan speed; transmitting
signals to the control panel such as flashing
indicator lights should there be a malfunction.
The compressor together with its electronic
unit fulfils applicable radio interference
regulations and is CE-marked.
When connected to shore power, a high-
quality battery charger of minimum 10 Amp
output should be used. This must always be
connected to the boat's service batteries and
never directly to the control unit. When using
shore-power, the Control Panel should be in
the "MAN.TEMP" position.
Holding Plate - (Fig. B)
The holding plate is a hermetic, stainless
steel container holding a special freon-free
eutectic liquid medium, which freezes to ice
when the engine is running. The freezing
point of the liquid is normally -8°C (17°F).
The holding plate is connected to the
compressor unit by a pliable, 3 metre long
tinned copper pipe of 6 mm diameter fitted
with quick-coupling connections. The holding
plate must be fitted as high as possible in the
refrigerator. It may be installed in any vertical
or horizontal position required and at any
level above or below that of the compressor
unit.
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