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INDOOR UNIT CONTROLS and COMPONENTS
Terminal Block
Display
●
The
unit
terminal
block
receives
electrical
power
from the
outdoor
unit.
There
are
4
connections
for
electrical
wires.
Terminals
1
and
2
are
connected
to
terminals
1
and
2
of
the
outdoor
unit.
This
wiring
supplies
power
to
the
indoor
unit.
Terminal
3
is
a
communication
wire.
The
indoor
unit
sends
indoor
air
temperature,
coil
temperature
and
temperature
setpoint
information
to
the
outdoor
unit
on
this
wire.
If
a
splice
or
break
in
this
wire
is
present,
the
indoor
unit
will
not
be
able
to
communicate
with
the
outdoor
unit.
The
ERROR
C
ODE
will
be
an
E7.
The
indoor
display
has
an
infrared
communication
circuit
that
receives
operating
commands
from
the
remote
control.
This
displa
y
will
indicate
operating
modes,
error
codes,
indoor
air
temper
ature,
timer
status, and power status.
Ambient Temperature Sensor
The
Ambient (room) Temperature Sensor
is
a
negative
c
thermistor
that
will
decrease
in
resistance
with
increases
in
room
air
temperature.
The
sensor
is
located
on
a
clip
mounted
in the return air stream.
T
he
sensor
connects
to
the
control
board
at
Plug
CN-6.
Piping Temperature Sensor
The
Piping
Temperature
Sensor
is
a
negative
thermist
or
that
will
decrease
in
resistance
with
increases
in
c
oil
temperature.
The
sensor
is
located
in
a
socket
soldered
t
o the surface of the indoor coil.
This
sensor
will
monitor
the
temperature
of
the
indoor
coil
in
both
cooling
and
heating
modes
of
operation.
Should
abnormally
cold
or
hot
coil
temperature
be
detected
by
this
sensor
,
sensor
sensor
the
system
will
take
steps
to
c
orrect
the
condition
or
report
an
ERROR
CODE.
T
he
sensor
connects
to
the
control
board
at
Plug
CN-6.
PAGE 23
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