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REFRIGERANT
METERING
DEVICE
EDM2,
EDD2,
EDA2
Models:
These
Coils
have
a
factory
installed
hard
shut-off
TXV
designed
only
for
use
with
R-22
refrigerant.
Use
only
with
outdoor
units
designed
for
R-22.
EDM4,
EDD4,
EDA4
Models:
These
Coils
have
a
factory
installed
hard
shut-off
TXV
designed
only
for
use
with
R-410A
refrigerant.
Use
only
with
outdoor
units
designed
for
R-410A.
TXV
is
factory
set
and
not
field
adjustable.
CHECK
AND
ADJUST
AIR
FLOW
A
CAUTION
PRODUCT
DAMAGE
HAZARD
Failure
to
follow
this
caution
may
result
in
product
damage.
This
Coil
has
a
hard
shut-off
TXV
metering
device.
Acompressor
Hard
Start
Kit
is
required
in
all
ap-
plications
where
the
matching
outdoor
unit
has
a
single-phase
reciprocating
compressor.
4&
WARNING
ELECTRICAL
SHOCK
HAZARD
Failure
to
shut
of
electric
power
could
result
in
personal
injury
or
death.
Before
adjusting
blower
speed,
shut
off
electric
power
to
the
furnace
or
blower
module.
It
is
important
that
the
correct
amount
of
air
(CFM)
flows
through
the
coil.
The
installer
must
determine
the
required
CFM
based
on
the
characteristics
of
the
specific
system
(such
as
system
size,
ducting,
components,
and
accessories).
In
general,
400
CFM
per
ton
is
the
nominal
required
value,
with
a
range
of
350
-
450
CFM
per
ton.
Check
Static
Pressure
Drop
and
CFM
Across
Coil
The
amount
of
air
(CFM)
is
related
to
a
pressure
drop.
To
determine
the
CFM,
measure
the
pressure
drop
using
an
inclined
manometer
(sometimes
called
draft
gauge
or
air
flow
gauge).
1.
The
coil
should
be dry
and
clean.
The
air
filter
must
be
clean
and
in
place.
All
registers
open.
DO
NOT
run
the
outdoor
unit
when
checking
air
flow.
2.
Run
the
blower
on
cooling
speed.
3.
Using
the
manometer
(draft
gauge
or
flow
gauge),
measure
the
static
pressure
drop
across
the
dry
coil
and
compare
it
to
the
numbers
in
Figure
11.
4.
Find
the
corresponding
CFM
in
Figure
11.
Adjusting
Air
Flow
If
CFM
is
too
low,
increase
the
blower
speed
and
measure
the
static
pressure
drop
again.
Determine
CFM
from
Figure
11.
If
CFM
is
too
high,
reduce
the
blower
speed
and
measure
the
static
pressure
drop
again.
Determine
CFM
from
Figure
11.
NOTE:
Change
blower
speed
as
shown
instructions
for
the
furnace
or
air
handler.
in
the
NOTE:
It
may
not
be
possible
to
obtain
a
gauge
reading
exactly
the
same
as
shown
in
Figure
11.
This
is
due
to
variations
in
duct
systems
and
blower
speeds.
If
the
motor
is
at
the
highest
speed
and
the
CFM
is
still
not
high
enough,
replace
the
blower
and/or
motor
with
a
larger
size.
If
the
unit
has
an
adjustable
belt
driven
blower,
use
an
ammeter
to
check
the
motor
current
draw.
If
the
current
draw
is
higher
than
the
motor
name
plate
amps,
replace
the
motor
with
one
of
greater
horsepower.
484
01
3001
03
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