Technical data

Maintenance, troubleshooting, spare parts and dismantling
ACT 600 – 5000 33 – EN
SYMPTOM POSSIBLE CAUSE - SUGGESTED ACTION
 Dew Point too
low
 The fan is always on – verify the correct operation of the fan power contactor (see
KV1/KV2 on the electric diagram) and/or of pressure transducer (see BHP on the
electric diagram) – (Air-Cooled).
 Ambient temperature is too low - restore nominal conditions (Air-Cooled).
 The hot gas by-pass valve is out of setting - contact a refrigeration engineer to
restore nominal setting.
 Excessive
pressure drop
within the dryer.
 The dryer doesn’t drain the condensate - see specific point.
 The DewPoint is too low - the condensate is frost and blocks the air - see specific
point.
 Check for throttling the flexible connection hoses.
 The dryer
doesn’t drain
the condensate
 The condensate drain service valve is closed - open it.
 Verify the electric wiring.
 The DewPoint is too low - the condensate is frost and blocks the air - see specific
point.
 Inlet compressed air pressure is too low and condensate is not drained – restore
nominal conditions.
 Electronic drainer is not operating correctly (see paragraph 7.16).
 The dryer
continuously
drains
condensate.
 Electronic drainer is dirty (see paragraph 7.16).
 Water within the
line.
 The dryer doesn't start - see specific point.
 If installed - Untreated air flows through the by-pass unit - close the by-pass.
 The dryer doesn’t drain the condensate - see specific point.
 DewPoint too high - see specific point.
 HPS high
pressure switch
has been
activated.
 Check which of the following has caused the activation :
1. The ambient temperature is too high or the room aeration is insufficient - provide
proper ventilation (Air-Cooled).
2. The condenser is dirty - clean it (Air-Cooled).
3. The condenser fan doesn’t work - see specific point (Air-Cooled).
4. The cooling water is too hot - restore nominal conditions (Water-Cooled).
5. The cooling water flow is insufficient - restore nominal conditions (Water-Cooled).
 Reset the pressure switch pressing the button on the controller itself - verify the
dryer for correct operation.
 HPS pressure switch is faulty - contact a refrigeration engineer to replace it.
 LPS low
pressure switch
has been
activated.
 There is a leak in the refrigerating fluid circuit - contact a refrigeration engineer.
 The pressure switch reset automatically when normal conditions are restored -
check the proper operation of the dryer.