supply
should
only
be
used
to
serve
the heater(s).
The
position of
the
isolation
switch
must
be
such
that
it is adjacent to the heater(s)
and
easily accessible
at
all times,
additionally
the
isolator itself
must
have
a contact
separation
of
not
less
than
3mm
(as
per
BS
5991 clause 20.2).
The
main
isolator
fuse ratings are
detailed
on
the
appliance
data
plate.
Warning
Ensure
that
the electric
and
oil
supplies
are
turned
off before
any
electrical
work
is carried
out
on
the heater.
Ensure
that
wiring
cannot
make
contact
with
any
surfaces liable to be subject to high
temperatures
or
where
the
insulation
of
the
wiring
could
be
impaired
as a result of
such
contact.
All
Pakaway
cabinet heaters
must
be
earthed.
Caution
The
main
electrical
supply
must
not
be
switched
off
or
disconnected
as a
method
for
stopping
the
heater,
the
exception to this is in
an
emergency,
or
during
servicing,
when
the
heat
exchanger
has
been
allowed
to cool sufficiently to
prevent
any
damage
from occurring.
Claims
for
damage
will
not
be
considered
if
they
have
resulted
from incorrect
wiring
or
the
incorrect
use
of
the
heater.
2.9
Air
supply
Provision
must
be
made
for
the
existence
of
an
air
supply
for both
combustion
and
ventilation.
It
is a
requirement
that
the
area
where
the air
heater
is located
must
have a
permanent
air
vent
of
negligible resistance direct to the
outside
air. Such air vents
must
be
positioned so as
not
to
become
blocked
or
flooded,
nor
should
they
be placed so as to introduce
undesirable
matter
(e.g. flammable,
volatile,
or
aggressive
chemicals/
compounds
or
potentially
hazardous
or
harmful
substances)
either direct from the outside,
or
through
their proximity to
an
adjacent extraction system.
The criteria necessary for establishing the
minimum
size of
natural
vents
is detailed below;
Position
of
vent
Low level
(inlet)
High
level
(outlet)
Area
of
vent
direct
to
outside
540cm
2
+ 4.5cm
2
per
kW of
rated
input
per
heater
270cm
2
+ 2.25cm2
per
kW of
rated
input
per
heater
Where
mechanical ventilation is
used
it is a
requirement
that
the
inlet is
of
the
mechanical type,
and
the
outlet
is
either
mechanical
or
natural.
Caution
Systems of ventilation
that
employ
mechanical extraction
and
natural
inlet
must
not
be
used.
Furthermore,
where
the air
supply
is
by
way
of a mechanical
means
the inlet
must
be
positioned
at
low
level
and
be
capable
of
providing
a
minimum
throughput
as
detailed
in
section
8 of this
manual.
The
natural
extraction
air
vents
must
have
a
minimum
area as
per
above,
and
it is
strongly
recommended
that
natural
extraction
vents
are
situated
at
high level. Additionally,
an
automatic
control interlocked to the
burner
must
be
fitted to
ensure
burner
shutdown
in
the
event
of
air
flow
failure
or
restriction.
If
the
heater
is to
be
installed
within
its
own
separate
building
or
plant
room, the
above
details
do
still apply, as
does
the
requirement
for
minimum
space.
13
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