Emerson Copeland Scroll Installation And Reference Manual page 17

Trip to
Fault Type
Set Point
Set based on
Over Current
Compressor
Compressor
intends to start
Electrical but current
Failure transformers
sense no
current
*
Minimum 3
Compressor
minutes off time
Rapid Cycling
between starts
Ambient Ambient sensor
Temperature reads
Sensor Failure < -22°F or
(See Table 10) >145°F
Condensor Mid-coil sensor
Mid-Coil reads
Sensor Failure < -22°F or
(See Table 10) >145°F
© 2011 Emerson Climate Technologies
Printed in the U.S.A.
Application Engineering
B U L
Table 9 Continued
Code Code
Char. Char.
1 2
5 2
5 2
2 0
1 8
1 9
L E T
Control Board
Actions
-Stop the Unit
-Display over current
trip on diagnostic
-Display waiting to
restart on diagnostic
*
- Auto start the unit
after 3 minutes
-Lockout unit if 6 trips
in less than 12 hour
-Display over current
lockout on diagnostic
-Display compressor
protector trip on
diagnostic
-Auto Start When
protector resets
*
- Delay compressor
start, if minimum off
time is less than 3 min
-Display about to turn
on diagnostic
-Display ambient temp
sensors failure on
diagnostic
-Continue to run the
unit on default mode.
-Display mid-coil temp
sensors failure on
diagnostic
-Continue to run the
unit on default mode.
16
I N
AE5-1377 R2
Auto Possible Error and
Resets Solution
-Check rotarty switch,
make sure it is on the
right position according
to the unit model;
-Check oil level through
Auto compressor sight glass
Start (Low temp unit only);
-Check accumulator
(Low temp unit only),
inlet should connect
to return gas service
valve.
-Check whether contact
is pull-in? If not, check
wiring of contact coil;
-Check wiring, make
Auto sure compressor is
Start connected to contactor,
and is powered;
-Compressor motor
thermal protector trips,
wait until it resets.
-Compressor start
signal is active when
Auto
unit stops; the only
Start
thing needed to do is
wait until the unit starts
-check whether actual
ambient temperature is
out of range;
Run -Check whether
ambient sensor is
OK and connected to
control board.
-check whether actual
mid-coil temperature is
out of range;
Run -Check whether mid-
coil sensor is OK and
connected to control
board.