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TERMINAL
CONNECTIONS
The
wall
thermostat
terminal
block
is
located
behind
the
front
panel
and
is
easily
accessible
on front
of
control
panel.
STATUS
LED
TYPICAL
WALL
THERMOSTAT
NOTES:
@
@
@
@
a
D
\y
@
@
@
@
Energy
Management
(24VAC
in}
Common
R
WwW
O
see
Note
4
GH
GL
C
See
Note
2
TERMINAL
BLOCK
1.
Use
terminal
“O”
for
heat
pump
connection
only.
2.
Terminal
“C”
(common)
is
typically
only
required
for
digital
Wall
Thermostat
Energy
Management
Terminal
Connections
thermostats.
Terminal
Connections
TERMINAL
DESIGNATION
Fig.
24
—
Terminal
Connector
and
Status
LED
Location
R
24
VAC
WwW
Electric
Heat
Y
Compressor
oO
Reversing
Valve
GH
High
Fan
UNIT
DAMAGE
HAZARD
GL Low
Fan
c
Common
Failure
to
follow
this
caution
may
result
in
equipment
damage
or
improper
operation.
NOTE:
Any
illegal
input
combinations
will
be
captured
as
thermostat
wiring
failures
and
will
light
the
STATUS
LED
indicator
on
main
board
(see
Intelligent
Self-Checking
Contro/
section)
Improper
wiring
may
damage
unit
electronics.
Common
Fig.
25
—
Wiring
Connections
busing
is
not
permitted.
Damage
or
erratic
operation
may
result.
ENERGY
MANAGEMENT
INPUT
(FRONT
DESK
CONTROL)
The
controller
can
handle
a
switch
signal
from
remote
energy
management
input,
called
EM
signal
or
front
desk
control.
Input
must
be
24VAC.
If
system
receives
a
24VAC
signal,
it
will
turn
unit
off;
otherwise,
the
unit
runs
in
normal
control.
This
function
will be
disabled
under
Freeze
Guard
protection.
See
Fig.
25
for
terminal
connections.
INTELLIGENT
SELF-CHECKING
CONTROL
Your
E-TAC
has
a
computer
board
that
continuously
checks
key
components
of
the
unit
to
ensure
they
are
operating
properly.
Under
normal
operation,
unit
status
indicator
(STATUS,
on
main
PCB),
light
is
steadily
ON.
If
there
is
a
major
problem,
the
unit will
shut
down
and
display
a
diagnostic
failure
code
on
the
unit’s
display.
If
it
is
only
a
minor
failure
and
unit
is
correcting
the
fault
by
itself,
the
diagnostic
code
will
be
flashed
on
the
status
LED
that
can
easily
be
seen
when
the
front
panel
is
removed
(see
Fig. 24),
Failure
STATUS
codes
are
defined
in
the
table
below
Table
6—STATUS
LED
Indicator
Definitions
I
Indoor
air
temp
sensor
open/short
8-segment
display
‘Fl’,
with
STATUS
light
flash
|
times and
off
3
sec,
repeat
2
Indoor
coil
sensor
open
or
short
8-segment
display
‘F2’,
with
STATUS
light
flash
2
times and
off
3
sec,
repeat
3
Outdoor
coil
sensor
open/short
8-segment
display
‘F4’,
with
STATUS
light
flash
3
times and
off
3
sec,
repeat
4
Freeze
Guard
protection
8-segment
display
‘FP’
5
Indoor
coil
freeze
protection
STATU
light
flash
5
times and
off
3
sec,
repeat
6
Outdoor
coil
high
temp
protection
STATU
light
flash
6
times and
off
3
sec,
repeat
7
Defrost
(heat
pump
type)
STATU
light
flash
7
times and
off
3
sec,
repeat
8
Indoor
coil
high
temp
protection
STATU
light
flash
8
times and
off
3
sec,
repeat
9
Thermostat
wiring
error
STATU
light
flash
9
times and
off
3
sec,
repeat
10
High
pressure protection
(optional)
8-segment
display
‘El’,
(the
highest
display
grade)
NOTE:
When
status
light
is
flashing,
it
will
be
ON
for
1
seconds
and
OFF
for
another
|
seconds.
14
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