3.8 Air Distribution Installation
The
materials
selected
must
be
of
low
heat
capacity,
and
it is
preferable
that
all
warm
air
ductwork
is thermally insulated. Where
ducting
may
be subject to deterioration from exposure to
moisture
or
high
humidity
material selection
and
insulation are
prime
considerations. Joints
and
seams
must
be air tight
and
fastened securely
and
designed to remain so,
even
when
operating
at
high
temperatures
.
Adequate
support
must
be
designed into the layout of the
ductwork
to
ensure
that
the
integrity of the
seams
and
joints is maintained. The
support
must
be
independent
and
separate
from
the
heater
and
the
ducting,
to
allow
for free
movement
during
expansion
and
contraction. Where
ducting
passes
through
walls
or
partitions
sufficient clearance
must
be left,
irrespective of
any
fire
stop
requirement, to allow for expansion
and
contraction. Failure to
adhere
to these
latter
two
points
can result
in
the
generation
and
transmission of excess noise.
Where
ducting
is installed in concrete flooring a
permanent
membrane
must
be
used
to isolate the
ducting
from the corrosive effect of the alkaline salts within the concrete. Care
should
be taken to
ensure
that soft insulation material does not become compressed
and
thereby lose its effectiveness.
3.9 Warm Air Registers
In
order
that vertical
temperature
gradients are minimal thereby
providing
a more even heat
distribution, it is preferable to install
warm
air registers at low wall levels
or
at floor level,
with
the
size, number,
and
position
commensurate
with
the
requirement of the application.
To
minimise
noise levels the registers
should
be set
away
from corners, a
good
seal
between
the register f
rame
and
the wall is important, particularly
on
high
level positions, if unsightly staining
through
warm
air
/particulate
deposition is to
be
avoided
.
3.10 Heater Control Installation
Warning
Isolate heater from mains before
undertaking
any
electrical work.
All Cabinet Heaters are
manufactured
with
the following controls pre-wired
and
installed. See figs
13
and
14.
(a)
On/
off switch
(b)
Ventilation/heat
switch
(summer/winter
switch)
(c)
Manual!
automatic switch
(d) Thermostat
(e)
Time clock
(f)
Frost
stat
All
of
the
above
controls
are
located
on
a
removable
panel
which
when
separated
from
the
heater
can
be re-positioned so as to offer a remote facility. However, to facilitate this, it is necessary
to
order
and
fit
an
electrical panel cover
and
front
panel
blanking plate to the heater
in
place
of
the
control unit.
21
To Next Page
Loading...
