Note
Reference to The Institute of Gas Engineers publication UP-1
and
UP-2
together
with
BS
6891
is
strongly
ad
vised.
Service
and
Installation
pipework
must
be
of
a
diameter
equal
to
or
greater
than
the
inlet
connection
on
the
heater, all joints
must
be
sealed
using
an
approved
sealing
compound
,
and
the
system
purged
and
tested for
soundness.
2.2 Electrical
supply
Wiring external to
the
cabinet
heater
must
be
installed in accordance
with
any
local, national,
and
European
regulations, as well as
meeting
the
appropriate
requirements
of lEE regulations.
The
means
of
connection
to
the
main
electrical
supply
must
allow
for
complete
electrical
isolation of
the
heater(s), furthermore,
in
the case of heaters
wired
for a three
phase
supp
i
y,
the
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
aU
times, additionaUy
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
gas
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,
and
where
the
insulation of the "viring
could
be
impaired
as a result of
such
contact.
All 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
wiE
not
be
considered
if
they
have
resulted
from incorrect
wiring
or
the
incorrect
use
of the heater.
2.3 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
potentiaUy
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
Area
of
vent direct to
outside
Low
level
(inlet)
High
level
(outlet)
540cm
2
+ 4.5cm
2
per
kW
of
rated
input
per
heater
270cm
2
+ 2.2Scm2
per
kW of
rated
input
per
heater
8
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