Installation guide
F.
SERVICE
VALVES
Service
valves
are
closed
and
plugged
from
the
factory.
Outdoor
units
are
shipped
with
a
refrigerant
charge
sealed
in
the
unit.
Leave
the
service
valves closed
until
all
other
refrigerant
system
work
is
complete
or
the
charge
will
be
lost.
Leave
the
plugs
in
place
until
line
set
tubing
is
ready
to
be
inserted.
Heat
pumps
require
a
piston
metering
device
in
the
liquid
service
valve
for
proper
heating
operation.
Piston
is
shipped
in
the
piston
body
of
the
liquid
service
valve,
temporarily
held
in
place
with
a
plastic
cap.
Do
not
remove
the
plastic
cap
until
line
set
tubing
is
ready
to
be
installed.
Refer
to
Figure
7
and
follow
these
steps
for
piston
installation:
1.
Remove
plastic
cap holding
piston
in
piston
body
of
liquid
service
valve.
2.
Check
that
piston
size
(stamped
on
side
of
piston)
matches
with
number
listed
on
unit
rating
plate.
Return
piston
to
piston
body
of
liquid
service
valve
(either
direction).
3.
Find
plastic
bag
taped
to
unit
containing
copper
adapter
tube,
brass
nut,
and
plastic
washer.
4.
Install
plastic
washer
in
the
seat
inside
piston
body.
5.
Fit
brass
nut
onto
adapter
tube
and
install
tube
onto
liquid
service
valve.
Tighten
nut
finger
tight,
then
wrench
additional
‘2
turn
only.
Over
tightening
may
damage
the
plastic
washer.
Service
valve
bodies
are
brass and
suction
tube
stub
is
copper.
Liquid
Service
Valve
with
Heating
Figure
7
Piston
and
Adapter
Tube
PISTON
PISTON
BODY
SERVICE
VALVE
VALVE
CORE
<
G.
BRAZING
CONNECTIONS
NOTE:
For
Liquid
Service
Valve
-
Braze
lineset
to
adapter
tube
BEFORE
bolting
adapter
to
valve.
This
helps
prevent
overheating
and
damage
to
plastic
washer
or
o-ring.
For
Vapor
Service
Valve
-
remove
valve
core
from
schrader
port
on
Service
Valve
BEFORE
brazing.
This
helps
prevent
overheating
and
damage
to
valve
seals
(refer
to
Figure
7).
Replace
valve
core
when
brazing
is
completed.
4&
WARNING
FIRE
HAZARD
Failure
to
remove
refrigerant
and
oil
charge
before
brazing
could
result
in
personal
injury,
death,
and/
or
property
damage.
Refrigerant
and
oil
mixture
could
ignite
and
burn
as
it
escapes
and
contacts
brazing
torch.
Make
sure
the
refrigerant
charge
is
properly
removed
from
both
the
high
and
low
sides
of
the
system
be-
fore
brazing
any
component
or
lines.
Clean
line
set
tube
ends
with
emery
cloth
or
steel
brush.
Remove
any
grit
or
debris.
Insert
line
set
tube
ends
into
service
valve
tube
stubs.
Apply
heat
absorbing
paste
or
heat
sink
product
between
service
valve
and
joint.
Wrap
service
valves
with
a
heat
sinking
material
such
as
a
wet
cloth.
Braze
joints
using
a
Sil-Fos
or
Phos-copper
alloy.
CAUTION
PRODUCT
DAMAGE
HAZARD
Failure
to
follow
this
caution
may
result
in
product
damage.
A
Braze
with
Sil-Fos
or
Phos-copper
alloy
on
cop-
per—-to-copper
joints
and
wrap
a
wet
cloth
around
rear
of
fitting
to
prevent
damage
to
TXV.
428
01
5103
02