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
frame
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.
Models
WH-60
through
to WH-301
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.
The
WH-375
is
manufactured
without
the
above
controls
fitted,
these
may
be
supplied
separately
by
\-vay
of
the
CP2 control
panel
from Benson
Environmental
Ltd,
or
by
the installer to
the
customer's
specification.
17
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