Technical data

Maintenance, troubleshooting, spare parts and dismantling
32 – EN ACT 600 – 5000
8.2 Troubleshooting
Only qualified personnel should perform troubleshooting and or maintenance
operations.
Prior to performing any maintenance or service, be sure that :
 no part of the machine is powered and that it cannot be connected to the mains
supply.
 no part of the machine is under pressure and that it cannot be connected to the
compressed air system.
 maintenance personnel have read and understand the safety and operation
instructions in this manual.
Before attempting any maintenance operation on the dryer, shut it down and wait at
least 30 minutes. Some components can reach high temperature during operation.
Avoid contact until system or component has dissipated heat.
SYMPTOM POSSIBLE CAUSE - SUGGESTED ACTION
 The dryer
doesn't start.
 Verify that the system is powered.
 Verify the electric wiring.
 Blow of fuse (see FU1/FU2/FU4 on the electric diagram) of the auxiliary circuit -
replace it and check the proper operation of the dryer.
 DMC24 - The led
is lighted - see specific point.
 The compressor
doesn’t work.
 Activation of the compressor internal thermal protection - wait for 30 minutes, then
retry.
 Verify the electric wiring.
 DMC24 - Internal delay device – the display shows the seconds before start-up.
 DMC24 - The led
is lighted - see specific point.
 If the compressor still doesn’t work, replace it.
 Condenser’s
fan doesn’t
work (Air-
Cooled).
 Verify the electric wiring.
 Fan power contactor (see KV1/KV2 on the electric diagram) is faulty - replace it.
 DMC24 - The led
is lighted - see specific point.
 There is a leak in the refrigerant circuit - contact a refrigeration engineer.
 If the fan still doesn't work, replace it.
 DewPoint too
high.
 The dryer doesn't start - see specific point.
 The DewPoint probe doesn’t correctly detect the temperature - ensure the sensor
is pushed into the bottom of probe well.
 The Compressor doesn’t work - see specific point.
 The ambient temperature is too high or the room aeration is insufficient - provide
proper ventilation (Air-Cooled).
 The inlet air is too hot - restore nominal conditions.
 The inlet air pressure is too low - restore nominal conditions.
 The inlet air flow rate is higher than the rate of the dryer - reduce the flow rate -
restore nominal conditions.
 The condenser is dirty - clean it (Air-Cooled)
 The condenser fan doesn’t work - see specific point (Air-Cooled).
 The cooling water is too hot - restore nominal conditions (Water-Cooled).
 The cooling water flow is insufficient - restore nominal conditions (Water-Cooled).
 The dryer doesn’t drain the condensate - see specific point.
 The hot gas by-pass valve is out of setting - contact a refrigeration engineer to
restore nominal setting.
 There is a leak in the refrigerant circuit - contact a refrigeration engineer.