22
7.1 TROUBLESHOOTING
The troubleshooting and the eventual checks have to be worked out by qualified personnel. Pay particular
attention in entering the refrigerating circuit. The refrigerant if under pressure, while expanding could cause burns
and serious damage to the eyes, should it gets in contact with them.
SYMPTOM
POSSIBLE CAUSE - SUGGESTED ACTION
The machine doesn't start.
Check for power failure.
Verify the electric wiring.
The compressor doesn’t work.
Activation of the internal protection - wait for 30 minutes, then retry.
Verify the electric wiring.
Replace the internal protection.
If present, replace the start-up relay.
If present, replace the start-up capacitor.
If present, replace the run capacitor.
If the compressor still doesn’t work, replace.
The fan of the condeser doesn’t work.
Verify the electric wiring.
The PV pressure switch is faulty (25 SCFM) -contact refrigeration engineer to
replace it.
If the fan still doesn’t work, replace.
The fan of the final refrigerant
Verify the electric wiring.
Doesn’t work.
If the fan still doesn’t work, replace.
The dryer doesn’t drain the
Verify the electric wiring.
condensate.
The condensate drain mechanical filter is clogged- remove and clean.
The drain solenoid valve is jammed - remove and clean.
The coil of the condensate drain solenoid valve burned out - replace.
Air Dry Controller doesn’t work - replace.
The DewPoint is too low - the condensate is frost - see the specific section.
The dryer continuously drains
The drain solenoid valve is jammed - remove and clean.
condensate.
Air Dryer Controller doesn’t work - replace.
Water within the line.
The dryer is off - switch it on.
Untreated air flows through the by-pass unit (if installed) - close the by-pass.
The dryer doesn’t drain condensate - see the specific section.
DewPoint too high - see the specific section.
DewPoint too high.
The dryer is off - switch it on.
The refrigerating compressor doesn’t work - see the specific section.
The fan of the condenser doesn’t work - see the specific section.
The fan of the aftercooler doesn’t work - see the specific section.
The inlet air is too hot - restore the nominal conditions.
The inlet airflow rate is higher than the rate of the dryer - reduce the flow rate -
restore the normal conditions.
The ambient temperature is too high or the room ventilation is insufficient -
provide proper ventilation.
The condenser is dirty - clean.
The aftercooler is dirty - clean.
The dryer doesn’t drain the condensate - see the specific section.
LED of the Air Dry Controller is always on - see specific paragraph.
The set point of the Air Dry Controller is very high - see SET-UP of the Air Dry
Controller.
There is a leak in the refrigerating circuit - contact a refrigerating systems
engineer.
