Installation guide
START-UP
PROCEDURE
1.
Set
indoor
thermostat
selector switch
to
OFF.
2.
Turn
ON
all
electrical
disconnect
devices.
3.
If
unit
has
a
crankcase
heater,
energize
the
heater
and
wait
24
hours
before
proceeding.
4.
Set
indoor
thermostat
at
desired
temperature.
Be
sure
setpoint
is
below
indoor
ambient
temperature
to
call
for
cooling,
or
above
indoor
ambient
to
call
for
heating.
5.
Set
indoor
thermostat
selector
switch
to
COOL
or
HEAT.
Operate
unit
for
minimum
15
minutes,
then
check
the
system
refrigerant
charge.
REFRIGERANT
CHARGE
Factory
charge
amount
and
desired
subcooling
are
shown
on
unit
rating
plate.
Charging
method
is
shown
on
information
plate
inside
unit.
For
TXV,
use
subcooling
method.
For
Piston,
use
superheat
method.
To
properly
check
or
adjust
charge,
conditions
must
be
favorable
for
subcooling
or
superheat
charging.
Favorable
conditions
exist
when
the
outdoor
temperature
is
between
70°F
and
100°F
(21°C
and
38°C),
and
the
indoor
temperature
is
between
70°F
and
80°F
(21°C
and
27°C).
Follow
the
procedure
below.
Unit
is
factory
charged
for
15
feet
(4.6m)
of
lineset.
Adjust
charge
by
adding
or
removing
0.6
oz/ft
(17
g/mm)
of
3/8
liquid
line
above
or
below
15
feet
(4.6
m)
respectively.
For
standard
refrigerant
line
lengths
80
feet
(24.4m)
or
less,
allow
system
to
operate
in
cooling
mode
at
least
15
minutes.
If
conditions
are
favorable,
check
system
charge
by
super
heat
method
for
fixed
metering
device
and
subcooling
method
for
TXV.
If
any
adjustment
is
necessary,
adjust
charge
slowly
and
allow
system
to
operate
for
15
minutes
to
stabilize
before
declaring
a
properly
charged
system.
If
the
indoor
temperature
is
above
80°F
(27°C), and
the
outdoor
temperature
is
in
the
favorable
range,
adjust
system
charge
by
weight
based
on
line
length
and
allow
the
indoor
temperature
to
drop
to
80°F
(27°C)
before
attempting
to
check
system
charge
by
subcooling
method
as
described
above.
If
the
indoor
temperature
is
below
70°F
(21°C),
or
the
outdoor
temperature
is
not
in
the
favorable
range,
adjust
charge
for
line
set
length
above
or
below
15
feet
(4.6m)
only.
Charge
level
should
then
be
appropriate
for
the
system
to
achieve
rated
capacity.
The
charge
level
could
then
be
checked
at
another
time
when
the
both
indoor
and
outdoor
temperatures
are
in
a
more
favorable
range.
NOTE:
If
line
length
is
beyond
80
feet
(24.4m)
or
greater
than
20
feet
(6.1m)
vertical
separation,
See
Long
Line
Guideline
for
special
charging
requirements.
14
428
01
5103
02