Trane CGAD020 - Page 82

CGAD-SVN02C-EN82
Troubleshooting
Note: These troubleshooting procedures apply to the CGAD Standard units. Troubleshooting with optional components should be checked
with the Technical Assistance Department at Trane do Brasil.
Symptoms Possible Cause Procedure
1. Suction line is abnormally cold.
Flood back into the compressor.
1. Excessive flow in the expansion
valve.
1. Regulate and adjust the superheat
of the expansion valve and check if
the bulb is correctly fixed to the
suction line.
2. Same as above 2. Expansion valve is stuck in the
open position.
2. Fix or replace the expansion valve.
3. Charge is too much for the
equipment.
3. Compressor is always on. 3.
4. Expansion valve is stuck. 4. Suction line is abnormally cold.
Flood back into the compressor.
4. Fix or replace the valve.
5. Suction valves are broken on the
compressor.
5. Noisy compressor. 5. Remove the head, examine the
valves, and replace those that are
not working.
6. Excessive flow in the expansion
valve.
6. Suction line is abnormally cold.
Flood back into the compressor.
6. Regulate and adjust the superheat
of the expansion valve and check if
the remote bulb is correctly fixed to
the suction line.
Symptoms Possible Cause Procedure
1. Bubbles in the sight glass.
1. Lack of refrigerant.
1. Repair the leak and recharge.
2. Compressor kicks into short
cycling.
2. Little thermal charge in the chiller. 2. See item B.
3. Change of temperature on the
liquid line through the dryer or the
key lock solenoid valve.
3. The liquid line dryer is clogged or
there is a restriction on the solenoid
valve.
3. Replace the dryer filter or the
solenoid valve.
4. There is no refrigerant flow
through the valve.
4. The remote bulb of the expansion
valve lost its charge.
4. Replace the expansion valve.
5. Loss of capacity. 5. Expansion valve obstructed. 5. Clean the valve and replace if
necessary.
6. Conditioned space is too cold. 6. The potentiometer of the RCM is
set too low.
6. Adjust or fix as needed.
7. Superheat is too high. 7. The pressure drop through the
chiller is too much.
7. Readjust the superheat.
8. Air flow is low.
8. Filter is clogged.
8. Clean or change the filter.
Symptoms Possible Cause Procedure
1. High temperature in the
conditioned area.
1. Operating with too great of a
thermal charge.
1. Check for air infiltrations and
thermal insulation of the area.
2. Excessive consumption 2. Operating at a low voltage. 2. Make sure that the voltage is
within the range of utilization. If not,
contact the Power Company.
3. Excessive consumption 3. Overload relay trips. 3. Check operation. Change if
necessary.
J. SUCTION PRESSURE IS TOO HIGH
K. SUCTION PRESSURE IS TOO LOW
L. SCROLL COMPRESSOR IS USING TOO MUCH ENERGY