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INSTALLATION
For Isotherm SP, see also additional
separate instructions for mounting the
through hull fitting.
Tools required
In addition to the usual basic hand tools such
as screwdrivers, hammer, pliers, assortment
of drills, saw, tape measure, etc., the
following are required:
Small electric drilling machine; a 30 mm (1¼")
hole-saw drill; a 12 mm (1") drill; a 21 mm and
a 24 mm fixed spanner; crimping pliers for
electrical tab-type connectors. A sufficient
length of electric cable of suitable diameter
for connecting the compressor to the battery
and an assortment of screws to attach the
various components are also required.
General
First, decide where the various components
are best situated. Choose a suitable place for
the compressor unit at a pipe-run distance of
less than 3 metres from the box. Try to find a
position that requires only gentle, wide-radius
bends on the pipe work. The space intended
for the compressor should preferably be cool
and large and able to be reached by the cable
from the battery.
If the space chosen is not well-ventilated, fit
an air supply hose kit and run it to a point
where ventilation air can be taken from the
bilge (see Fig.)
The compressor space chosen should also
be within a cable-run distance of less than 4
metres from that of the control panel. The
compressor unit, together with its electronics,
is designed to withstand a normal marine
environment. It can be fitted in a splash-free
position but should preferably be placed in as
dry surroundings as possible. Mount the
compressor in a horizontal position to
allow it to achieve its maximum permitted 30°
angle of heel.
The holding plate position in the box should
be planned with consideration being taken to
the partition, routing of piping, etc. The unit
may be fitted in any desired position but must
be as high as possible in the box.
Fitting the holding plate
If the box to be used is already in place,
inspect it to establish the quality of its
insulation, as this is an important thermal
efficiency factor.
The best insulation materials are polyurethane
foam, extruded polystyrene, Divinycell,
Bonocell or any other cross-linked expanded
foam. A good rule-of-thumb is that the
thickness of this material should be 0.8-1 mm
per litre volume of the box. Insulating
materials of type Frigolite, Rockwool, etc., do
not insulate sufficiently and should not be
used.
The holding plate can be placed in any
position. It can be fitted vertically, horizontally,
upright or hanging. Due to the fact that cold air
always "falls" downward, the holding plate
should be positioned as high up in the box as
possible as good refrigeration cannot be
achieved above this level.
The 6 mm copper pipe leading from the
holding plate can be easily bent over the
rounded corner of the plate, thereby allowing it
leave the box in any direction.
The best position for the pipe to exit the box is
behind it in the space formed by the corner
supports of the holding plate. The pipe should
be handled with care and bent gradually to
avoid creasing it. Form it around a suitable
cylindrical object if sharp bends are required.
Be particularly careful with the thin capillary
pipe and its connection at the opposite end
and do not loosen the two locking pipe turns
around the thicker pipe. The pipes are pre-
filled with refrigerant and must not be cut.
Start by unrolling the pipe to its full extent.
Installation of the holding plate is easier if
someone can assist. One person can hold the
plate and direct the pipe through the side of
the box while the other feeds the pipe together
with the two connections through bulkheads,
etc.
The holding plate can be screwed either onto
the wall or on the underside of the top if space
is available. If necessary, it may be easier to
mount if openings are cut into the holes in the
two supports under the holding plate to suit
the diameter of the screws to be used. These
screws may then be fitted into the box first
and the holding plate "slotted" into place.
Drill the 30 mm hole for the pipe and
connections as high as possible under where
the holding plate is to be fitted. This is where it
is warmest should any leakage of air occur.
Fill the hole surrounding the pipe with
insulation material. Any excess piping should
be coiled in a suitable position outside the box
and securely fastened to avoid vibrating.
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