Optional Energy Wheel; Troubleshooting; Microprocessor Controller; Phase Monitor - LG GEN2 Series Installation And Operation Manual

Optional Energy Wheel

Symptom Possible Cause
Air seals are too tight.
Energy wheel
does NOT
Broken belt.
turn
No power to wheel motor.
Energy Wheel motor overloads are
wheel runs tripping due to rubbing between
intermittently wheel and air seals.
Troubleshooting – Alarms
Several of the electronic controls in the unit monitor the
system for faults and will go into alarm, shutting down
the unit or a single function within the unit.

Microprocessor Controller

The microprocessor is located in the main control
center. If the microprocessor is in alarm condition, the
Alarm button will blink red. Press the Alarm button to
see the specific condition or to reset the
microprocessor. Refer to the microprocessor IOM for
detailed information on fault codes and see the unit-
specific wiring diagram.

Phase Monitor

The phase monitor has two LED indicator lights, one
red and one green. Green indicates proper operational
status, red indicates the unit has detected a fault and is
in alarm condition. The alarm LED will blink to show the
specific fault and there is a chart printed on the monitor
that shows the code for the blinking light. The phase
monitor is self-resetting once the alarm condition is
corrected. It is located in the main control center.
Variable Frequency Drive (VFD)
Variable frequency drives have a display screen that will
show an alarm condition. If a fault such as a voltage
spike occurs, the VFD will go into alarm and will not
reset until a hard restart is performed. See the unit-
specific manufacturer's manual supplied with the unit.
VFDs are located in the main control center.
–

Troubleshooting

Corrective Action
Refer to Adjust the Air Seals in the Optional Energy Wheel
Start-Up section.
Replace.
Make sure wheel drive is plugged in. Verify power is available.
Recheck air seals, make sure they are not too tight. See Adjust
the Air Seals in the Optional Energy Wheel Start-Up section.
Optional Digital Scroll Compressor
Controller
Present only if packaged DX with digital scroll option is
selected. The controller has
three LED indicator lights.
One is green, indicating that it
has power, one is an alarm
indicator that will flash a code
for various alarm conditions
and the third indicates
whether the compressor
is operating in a loaded or unloaded condition. See
the manufacturer's unit-specific manual for further
information.
See the Fault Code chart below. The Fault Code chart
is also printed on the back of the controller. Note that
if the controller generates either a Code 2 or a Code 4
Lockout, a manual reset must be performed. Manual
Reset is accomplished by shutting off main power to the unit
and then turning it back on.
Digital Scroll Compressor
Controller Fault Codes
System
Alert Code
Condition
High Discharge
Code 2*
Temperature Trip
Compressor
Code 3
Protector Trip
Code 4* Locked Rotor
Demand Signal
Code 5
Loss
Discharge
Code 6
Thermistor Fault
Code 7 Future
Welded
Code 8
Contactor
Code 9 Low Voltage
*Protective faults that require manual reset.
Diagnostic
Action
Alert Light
Blinks 2 Times Lockout
Blinks 3 Times Lockout
Blinks 4 Times Lockout
Blinks 5 Times Lockout
Reduce
Blinks 6 Times
Capacity
N/A N/A
Unload
Blinks 8 Times
Compressor
Blinks 9 Times Trip Compressor