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INTRODUCTION
The
ENH4X
is
a
horizontal,
multi-use
furnace
coil
(see
Figure
1).
With
the
use
of
field-supplied
transition
duct,
these
furnace
coils
can
also
be
applied
to
other
similar
horizontal
furnaces
on
the
market.
The
ENH4X
is
available
in
sizes
24
through
60.
All
models
are
equipped
with
a
factory-installed
TXV
and
are
used
with
R-410A
refrigerant
systems.
NOTE:
Models
with
tin-plated
copper
coils,
“T”
in
the
8th
position
of
the
model
number,
are
installed
the
same
as
standard
copper
coils.
INSTALLATION
Shipping Brace
-|,
Remove
2
Screws
Pan
Extension
A06031
Figure
1
-
Model
ENH4X
Furnace
Coil
This
coil
is
not
designed
to
be
installed
with
furnaces
that
measure
wider
than
the
coil
itself.
These
units
can
be
installed
in
multiple
configurations.
Before
installation,
there
are
several
performance
requirements
that
must
be
considered
because
poor
installation
can
negatively
alter
performance.
This
section
will
briefly
discuss
those
factors.
Ductwork
Coil
Furnace
<<
a
Airflow
¢«——
Filler
Plate
Ductwork
Coll
Furnace
os
|
Airflow
©
200
|)
«—
Fifer
Plate
Ductwork
Coil
Furnace
>
oO
¢
Filler
Plate
A08065
Figure
2
-
Horizontai-Left
installation
with
Filler
Plate
Furnace
Coil
Ductwork
Airflow
S90
Filler
Plate
——»
Furnace
Coil
Ductwork
Filler
Plate
——»
oC
Filler
Plate
—»
Coil
Ductwork
a
Furnace
Airflow
——
A08066
Figure
3
-
Horizontal-Right
Installation
with
Filler
Plate
Airflow
Airflow
amount
and
distribution
are
vital
to
adequate
system
performance.
In
addition,
heat
pump
applications
require
airflow
in
a
particular
direction
for
best
performance.
See
decal
on front
of
coil
for
correct
direction.
Problems
that
can
be
experienced
with
incorrect
airflow
include:
¢
low
system
performance
¢
restricted
TXV
¢
frosted
coil
*
poor
humidity
control
«
water
blow-off
When
attaching
the
coil
and
building
the
plenum,
pay
special
attention
to
the
effect
these
details
will
have
on
airflow.
After
system
start-up,
check
the
cfm
to
insure
that
it
is
correct.
(Generally,
the
cfm
should
be
350
to
400
cfm/ton
during
normal
cooling
operation.)
IXv
A
thermal
expansion
valve
is
utilized
in
this
coil
design
to
optimize
performance
and
comfort
throughout
the
entire
operating
range
of
the
system.
Special
attention
needs
to
be
taken
to
the
TXV
when
installing
the
coil
¢
Do
not
overheat
valve.
Temperatures
that
exceed
212°F
(100°C)
can
harm
valve
performance.
Use
a
wet
cloth
or
heat
sink
when
brazing.
484
01
3700
01
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