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REFRIGERANT
TUBING
Refrigerant
Tubing
Connection
and
Evacuation
Use
accessory
tubing
package
or
field-supplied
tubing
of
refrigerant
grade.
Suction
tube
must
be
insulated.
Do
not
use
damaged,
dirty,
or
contaminated
tubing
because
it
may
plug
refrigerant
flow-control
device.
ALWAYS
evacuate
the
coil
and
field-supplied
tubing
to
500
microns
before
opening
outdoor
unit
service
valves.
4&
CAUTION
PRODUCT
DAMAGE
HAZARD
Failure
to
follow
this
caution
may
result
in
product
or
property
damage.
A
brazing
shield
MUST
be
used
when
tubing
sets
are
being
brazed
to
the
unit
connections
to
prevent
damage
to
the
unit
surface and
condensate
pan
fitting
caps.
Units
have
sweat
suction
and
liquid
tube
connections.
Make
suction
tube
connection
first.
1.
Cut
tubing
to
correct
length.
2.
Insert
tube
into
sweat
connection
on
unit
until
it
bottoms.
3.
Braze
connection
using
silver
bearing
or
non-silver
bearing
brazing
materials.
Do
not
use
solder
(materials
which
melt
below
800°F
/
427°C).
Consult
local
code
requirements.
4.
Evacuate
coil
and
tubing
system
to
500
microns
using
deep
vacuum
method.
4&
CAUTION
PRODUCT
DAMAGE
HAZARD
Failure
to
follow
this
caution
may
result
in
product
or
property
damage.
Wrap
a
wet
cloth
around
rear
of
fitting
to
prevent
damage
to
piston
assembly
or
TXV
and
factory-made
joints.
REFRIGERANT
FLOW-CONTROL
DEVICE
FEM4P,
FSM4P,
and
FSU4P
Models:
These
units
come
equipped
with
a
factory
installed
Piston
metering
device
with
Teflon
ring.
If
a
piston
replacement
if
required,
check
piston
size
shown
on
indoor
unit
rating
plate
to
see
if it
matches
required
piston
shown
on
outdoor
unit
rating
plate.
If
it
does
not
match,
replace
indoor
piston
with
piston
shipped
with
outdoor
unit.
The
piston
shipped
with
outdoor
unit
is
correct
for
any
approved
indoor
coil
combination
(See
Figure
20).
When
changing
piston,
use
a
back-up
wrench.
Hand
tighten
hex
nut,
then
tighten
with
wrench
1/2
turn.
Do
not
exceed
30
ft-lbs.The
indoor
piston
contains
a
Teflon
ring
(or
seal)
which
is
used
to
seat
against
the
inside
of
distributor
body,
and
must
be
installed
properly
to
ensure
proper
seating
in
the
direction
for
cooling
operation.
A
CAUTION
PRODUCT
OPERATION
HAZARD
Failure
to
follow
this
caution
may
result
in
improper
product
operation.
If
using
a
TXV
in
conjunction
with
a
single-phase
reciprocat-
ing
compressor,
a
compressor
start
capacitor
and
relay
are
required.
Consult outdoor
unit
pre-sale
literature
for
start
as-
sist
kit
part
number.
Figure
20
Refrigerant
Flow-Control
Device
BRASS
HEX NUT
DISTRIBUTOR
TEFLON
SEAL
TEFLON
RING
&
Elana
fe\/-=4
PISTON
ence
FLOW
IN
COOLING
BRASS
HEX
BODY
PISTON
RETAINER
aa
STRAINER
Ci
496
01
5501
01
15
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