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Maintenance, troubleshooting, spare parts and dismantling
Dew point too high.
Dew point too low with
parameter ESS=NO
(see sect. 11.12.7)
Dew point too low with
parameter ESS=YES
(see sect. 11.12.7)
Excessive pressure
drop within the dryer.
The dryer does not
drain the condensate.
The dryer continuously
drains the condensate.
Water within the line.
30
The compressor does not work – see specific point.
The DewPoint probe T1 doesn't correctly detect the temperature - ensure the sensor
is pushed into the bottom of probe well.
The ambient temperature is too high or the room aeration is insufficient - provide
proper ventilation.
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.
The condenser fan does not work – see specific point.
The dryer does not drain the condensate – see specific point.
If ESS=NO (see section 11.12.7) – The hot gas bypass valve is out of setting –
contact a refrigeration engineer to restore nominal setting.
If ESS=YES (see section 11.12.7) – DewPoint on this type of dryer is fluctuating (the
compressor turns ON and OFF) and for some periods can reach values higher than
normal - wait for the compressor start and the DewPoint will drop to lower
temperature.
The solenoid valve EVL is not operating correctly - see specific point.
There is a leak in the refrigerant circuit – contact a refrigeration engineer.
The fan is always ON – verify the electric wiring, check the setting of PV pressure
switch or PV pressure switch is faulty – replace it.
The ambient temperature is too low – restore nominal conditions.
The hot gas bypass valve is out of setting – contact a refrigeration engineer to restore
nominal setting.
DewPoint on this type of dryer is fluctuating (the compressor turns ON and OFF) and
for some periods can reach values lower than normal - wait until the DewPoint rise to
normal temperature.
The refrigerating compressor is always ON, even though the led
the electric wiring or KC1 power contactor (if installed) is faulty – replace it.
The dryer does not drain the condensate – see specific point.
The dew point is too low – the condensate is frozen and blocks the air – see specific
point.
If ESS=YES (see section 11.12.7) – The DewPoint probe T1 doesn't correctly detect
the temperature and the condensate freeze– ensure the sensor is pushed into the
bottom of probe well.
Check for throttling the flexible connection hoses.
The condensate drain service valve is closed – open it.
Verify the electric wiring.
The dew point is too low – the condensate is frozen and blocks the air – see specific
point.
Inlet compressed air pressure is too low and the condensate is not drained – restore
nominal conditions
Electronic drainer is not operating correctly
Electronic drainer is dirty
If installed - untreated air flows through the bypass unit – close the bypass.
The dryer does not drain condensate – see specific point.
Dew point too high – see specific point.
The compressed air pipeline downstream of the dryer are located at a very low
ambient temperature and the remaining humidity in the compressed air is
condensing: is required to review the plant compressed air distribution system.
If ESS=YES (see section 11.12.7) – DewPoint on this type of dryer is fluctuating (the
compressor turns ON and OFF). In low ambient temperature condition (winter
season) the remaining humidity in the compressed air is condensing. Set ESS=NO
(see section 11.12.7)
is OFF – verify
DRYPOINT® RA CT 200-500 NA 3PH
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Table of Contents
Troubleshooting
