Page 4
3) SYSTEM DESCRIPTION.
The system comprises a room unit cooling
section, an external heat exchanger and the
two are interconnected by means of a flow
and return water pipe and an electrical
supply to the heat exchanger fan. The room
unit is fitted with an automatic condensate
disposal pump which discharges the
condensate via a small plastic pipe into the
base of the external heat exchanger. This
pipe and all interconnecting pipes and
electrics are secured together. In addition,
both ends of each pipe are fitted with "quick
connect" couplings that open on coupling
but reseal to become water tight on
disconnect.
4) AIR FLOW
The angled air outlets at the top of the
standard room unit are fitted with air grilles
that allow the angle of air outlet to be
adjusted vertically and horizontally and, in
conjunction with the fan speed control
switch, the air velocity and direction can be
carefully set up to obtain maximum
coverage of the area being cooled without
causing drafts. Care should be taken to
avoid outlet air being obstructed as this will
cause the air to "eddy" around the unit
resulting in recirculation and short/
inaccurate cycling of the machine. Ideally,
cold air should be directed to create a
"blanket" all across the ceiling area allowing
natural convection to drop the air over the
whole area at very low velocity.
5) SITING
ROOM UNIT.
Ideally, the room unit should be positioned
equidistant along the shortest wall in the
room blowing down the length of the room.
If there is more than one unit in the same
area, then they would normally be
positioned side by side, and equidistant
along the long wall, all pointing in the same
direction. Sometimes it may be necessary
to position units around the perimeter of an
area but, in this case, great care should
be taken to avoid one unit blowing cold air
straight into another which will adversely
affect the machine operation. Good and
correct air flow is, perhaps, the single most
important aspect of satisfactorily applying
portable air conditioners. If in doubt seek
the advice of your supplier.
HEAT EXCHANGER
The heat exchanger must stand external to
the area being cooled and, preferably, in the
outside atmosphere. It can stand freely on
a flat surface. The castor wheels should be
locked to prevent the heat exchanger from
moving.
