A
PD MANUAL
IOM-39
13 of 36
Aug 99 R1
Where
CM
is
circular
mils
of
conductor
for
a
constant
load
of
I
amps,
wire
length
L
in
feet
from
the
unit
to
the
field
device
and
back,
and
voltage
drop
V
.
When
connecting
to
a
three
phase
power
supply,
check
for
the
correct
rotation
of
all
motors
and
fans.
If
the
rotation
is
incorrect,
reverse
the
rotation
at
the
incoming
power
only.
All
electrical
conduit
outlets
in
the
control
panel
must
be
sealed
to
prevent
moist
building
air
from
migrating
to
the
control
panel.
All
penetrations
through
the
unit
walls
must
be
caulked
and
sealed
to
prevent
air
and/or
water
from
entering
the
unit.
COIL
CONNECTIONS
This
equipment
may
require
field
connection
of
water,
steam
or
refrigerant
coils.
For
proper
operation
airflow
must
be
counterflow
to
the
flow
of
the
fluid.
The
inlet
water
connection
is
normally
at
the
bottom
of
one
header
and
the
outlet
water
connection
at
the
top
of
the
other
header.
The
steam
connection
is
at
the
middle
of
the
supply
header
and
the
condensate
is
at
the
bottom
of
the
other
header.
Caution:
Use
a
backup
wrench
on
threaded
coil
connections
when
installing
piping.
For
refrigerant
coils,
all
piping
is
to
be
installed
by
a
qualified
refrigeration
mechanic.
All
refrigeration
specialties
shall
be
installed
using
good
refrigeration
installation
and
design
practices.
Recovery,
reuse,
recycling,
reclamation,
and
safe
disposal
of
refrigerant
is
the
only
acceptable
practice
today.
Venting
of
refrigerant
into
the
atmosphere
during
installation
or
servicing
is
unacceptable.
To
avoid
damage,
use
an
accepted
refrigerant
recovery
system
whenever
removing
refrigerant.
When
working
with
refrigerants
you
must
comply
with
all
local
government
safety
and
environmental
laws.
DRAIN
TRAPS
Each
drain
connection
requires
a
separate
drain
trap
supplied
and
installed
by
the
contractor.
For
a
trap
to
work
properly,
it
must
be
primed.
During
freezing
periods,
primed
traps
may
need
to
be
heat
traced
or
drain
and
plug
the
trap
when
not
in
use.
If
a
drain
connection
has
a
smaller
pipe
inside,
connect
to
the
outer
pipe
only.
Ensure
that
the
trap
is
of
adequate
depth
to
operate
against
a
static
that
includes
the
extra
pressure
drop
for
dirty
filters.
Warning:
Failure
to
properly
trap
each
connection
can
result
in
drain
pan
flooding,
standing
water
in
unit,
building
damage,
injury
or
death,
cause
poor
air
quality
or
other
problems.
