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A temperature sensor is fitted to the rear of
the holding plate. This is to be connected to
the compressor unit by the 3.5 metre cable
supplied and can suitably follow the same
route as the 3 metre connecting pipe This
pipe (together with the compressor and
holding plate) is pre-filled with exactly the
correct amount of cooling medium and on no
account should any attempt be made to
either shorten or lengthen it. If the pipe is too
long, the excess should be made into a coil
at some suitable position. If a longer pipe is
required, a pre-filled 2.5 metre extension
pipe is available. A 2.5 metre extension for
the temperature sensor cable is also
available.
Control Panel -(Fig. C)
The control panel is equipped with a three-
way switch; green, yellow and red indicator
lights; and a rheostat for manual
temperature adjustment when running on
shore-power or a solar panel.
Inside the control panel box is a modular
connector for the 4 metre cable from the
electronic control unit on the compressor.
Should this require extending, use the 10
metre long accessory cable instead.
OPERATION
The ISOTHERM refrigeration system can be
operated in two ways. When energy saving
is needed, switch to "NORMAL.AUTO"
position. Optimum refrigeration temperature
is then automatically maintained while
consuming the lowest amount of battery
power possible. When there is no need of
energy saving, switch to "MAN.TEMP"
position. The automatic function is now
partially blocked and refrigeration
temperature can be manually adjusted (Fig.
C). In its centre position, the ISOTHERM
unit is switched off.
"NORMAL•AUTO" position:
The green light indicates that power is being
supplied and the refrigeration programme is
activated.
When the engine is running and the voltage
supply (measured at the compressor's
control unit) is over 13.2 (26.4) volt, the
compressor starts to supply cooling energy to
the holding plate. It starts within the first 30
seconds and operates first at low speed with
the yellow "Economy" indicator lit.
After about half a minute, the speed of the
compressor and cooling fan increases by 75%
and the red "Freeze" indicator lights. This
operating condition is maintained until the
holding plate is completely frozen at
approximately -14° (7°F). This can take
between 45 minutes and 2 hours depending
on the model, ambient temperature, box size
and insulation. On reaching this temperature,
the compressor stops and red light goes out.
When the temperature of the holding plate
rises to -10°C (14°F), the compressor re-starts
to charge the holding plate and the red light
comes on again. This process is repeated a
couple of times every hour keeping the
holding plate at its optimum efficiency level.
When the engine is stopped, the compressor
also stops shortly afterwards. When the
engine is stopped and the battery voltage is
below 12.7 (25.4) volt, the surplus of
refrigeration energy stored in the holding plate
is used first.
Only when this has been consumed does the
compressor start. The yellow light indicates
that it is now running at its low "Economy"
speed to "top-up" the holding plate only. This
condition starts when the temperature of the
holding plate rises to -1°C (30°F) and stops
when it reaches economy level of -6°C (21°F).
"MAN•TEMP" position:
This position can be used either when shore-
power or solar panels are being used or when
energy saving is not required and a higher or
lower refrigerator temperature is desirable for
some reason. The automatic function is
blocked the temperature regulated by means
of the rheostat - clockwise for colder and anti-
clockwise for warmer. "A" indicates the
holding plate temperature point for
"Accumulation", approx. –8°C (17°F). In the
"MAN•TEMP" position, the compressor starts
to maintain the temperature chosen. It runs on
lowest possible speed, as the engine is
stopped, with a very nearly inaudible level of
sound.
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