DewPoint too low. The fan is always ON - PV pressure switch is faulty - replace it (Air-Cooled).
The hot gas by-pass valve is out of setting - contact a refrigeration engineer to restore the
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.
The condensate drain strainer is clogged - remove and clean it.
The drain solenoid valve is jammed - remove and clean it.
Verify the electric wiring.
The coil of the condensate drain solenoid valve burned out - replace it.
The DewPoint is too low - the condensate is frozen - see specific point.
DMC20- Drain time on DMC20 is set at zero seconds. - see DMC20 “Set-Up” section.
The dryer
continuously drains
condensate.
The drain solenoid valve is jammed - remove and clean it.
Try to remove the electric connector on the solenoid valve - if drain stops verify the electric
wiring or the electronic instrument is faulty - replace it.
Water within the line. The dryer doesn't start - see specific point.
Where 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.
The safety thermo-
switch T
S
tripped.
Check which of the following has caused the activation :
1. Excessive thermal load – restore the standard operating conditions.
2. The inlet air is too hot - restore the nominal conditions.
3. The ambient temperature is too high or the room aeration is insufficient - provide proper
ventilation.
4. The condenser unit is dirty - clean it.
5. The fan doesn’t work - see specific point.
6. There is a leak in the refrigerating fluid circuit - contact a refrigeration engineer.
Reset the thermo-switch by pressing the button on the thermo-switch itself – verify the
correct operation of the dryer.
The T
S
thermo-switch is faulty - replace it.
The P
A
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 the nominal condition (Water-Cooled).
5. The cooling water flow is insufficient - restore the nominal condition (Water-Cooled).
Reset the pressure-switch pressing the button on the controller itself - verify the dryer for
correct operation.
The P
A
pressure switch is faulty - contact a refrigeration engineer to replace it.
The P
B
low-pressure
switch has been
activated.
There is a leak in the refrigerating fluid circuit - contact a refrigeration engineer.
The pressure switch restores automatically when normal conditions are restored - check the
proper operation of the dryer.
DMC14- The “alarm”
led is ON.
The P
A
high-pressure switch is activated - see specific point.
The P
B
low-pressure switch is activated - see specific point.
The electric protection (see Q1 on the electric diagram) of the compressor is activated -
restore it and retry.
The electric protection (see Q2 on the electric diagram) of the fan(s) is activated - restore it
and retry (air cooled).
The thermal protection (see TV on the electric diagram) inside the fan is activated - wait 30
minutes and retry.
The safety thermo-switch T
S
has been activated - see specific point.
DMC14- The LED
of the
instrument is on or
flashes to indicate
alarm situations.
The LED flashes because the DewPoint is too high – see specific point.
The LED flashes because the DewPoint is too low - see specific point.
The LED flashes because the probe is faulty or interrupted, the instrument displays
the message “PF” (Probe Failure) – replace the probe.
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