| Problem |
Probable
Cause |
Remedial
Action |
| Low pressure at point of use |
Leaks in distribution piping |
Check lines, connections and valves
for leaks; clean or replace filter elements |
| a |
Clogged filter elements |
a |
| a |
Fouled dryer heat exchanger |
Clean heat exchanger |
| a |
Low pressure at compressor discharge |
See Below |
| Low pressure at compressor discharge |
For systems with modulating load
controls, improper adjustment of air capacity control |
Follow manufacturer's recommendation
for adjustment of control
|
| a |
Worn or broken valves |
Check valves and repair or replace as
required |
| a |
Improper air pressure switch setting |
Follow manufacturer's recommendations
for setting air pressure switch |
| Water in lines |
Failed condensate traps |
Clean, repair or replace the trap |
| a |
Failed or undersized compressed air
dryer |
Repair or replace dryer |
| Liquid oil in air lines |
Faulty air/oil separation
|
Check air/oil separation system;
change separator element |
| Dirt, rust, or scale in air lines |
In the absence of liquid water, normal
aging of the air lines |
Install filters at point of use |
| Excessive service to load/hour ratio |
System idling too much
|
For multiple compressor systems,
consider sequencing controls to minimize compressor idle
time; Adjust idle time according to manufacturer's
recommendations |
| a |
Improper pressure switch setting |
Readjust according to manufacturer's
recommendations |
| Elevated compressor temperature |
Restricted air flow |
Clean cooler exterior and check inlet
filter mats |
| a |
Restricted water flow |
Check water flow, pressure, and
quality; clean heat exchanger as needed |
| a |
Low oil level |
Check compressor oil level, add oil as
required |
| a |
Restricted oil flow |
Remove restriction, replace parts as
required |
| a |
Excessive ambient temperatures |
Improper ventilation to compressor;
check with manufacturer to determine maximum operating
temperature |
