Trane CGAD020 - Page 81

CGAD-SVN02C-EN 81
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. High air temperature through the
condenser.
1. Reduced air flow through the
condenser.
1. Readjust the flow. Check for
obstructions.
2. The air leaving the condenser is
too cold. Small temperature increase
through the condenser.
2. The condenser vanes are dirty. 2. Clean the vanes.
3. The air leaving the condenser is
too hot.
3. Poor operation of the condenser
fans.
3. Check the motors of the
condenser fans.
4. The condenser is unusually hot
and the discharge pressure is too
high.
4. Non-condensable air or gases in
the systems.
4. Transfer the refrigerant to the
recycling. Make a new vacuum and
charge the system.
5. Same as above. 5. Excessive refrigerant charge. 5. Gradually remove the excess
refrigerant. The normal subcooling
is between 6 and 10°C.
6. Dirty tubes in the condenser's
shell and tube.
6. The water leaving the condenser
is too cold. Small temperature
increase through the condenser.
6. Clean the condenser tubes.
7. Poor operation of the cooling
tower.
7. Water entering the condenser at
high temperatures.
7. Check the fan motor of the tower,
the starting device, and the
thermostat.
Symptoms Possible Cause Procedure
1. Small temperature increase in the
condenser water.
1. Excessive water flow through the
condenser.
1. Readjust the flow and the
pressure drop for the design.
2. Same for air. 2. Excessive air flow through the
condenser.
2. Readjust the flow and the
pressure drop for the design.
3. Bubbles in the sight glass. 3. Lack of refrigerant. 3. Repair the leak and charge.
4. The temperature of the air
entering the condenser is too low.
4. Outdoor temperature is too cold. 4. Install an automatic pressure
regulator.
5. Discharge or suction valves on
the compressor are broken or
leaking.
5. The suction pressure increases
more quickly than 5 psig per minute
after a downtime.
5. Remove the head, examine the
valves, and replace those that are
not working correctly.
I. DISCHARGE PRESSURE IS TOO LOW
H. DISCHARGE PRESSURE IS TOO HIGH