Specifications

Maintenance, troubleshooting, spares and dismantling
34 DRYPOINT RA 80 – 720
 DewPoint too low.
 The fan is always ON - P
V
pressure switch is faulty - replace it (Air-Cooled).
 Ambient temperature is too low - restore de nominal condition.
 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.
 Verify the electric wiring.
 The DewPoint is too low - the condensate is frozen - see specific point.
 Bekomat drainer is not operating correctly ( see BEKOMAT MANUAL).
 The dryer
continuously drains
condensate.
 Bekomat drainer is dirty ( see BEKOMAT MANUAL).
 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.
7. Reset the thermo-switch by pressing the button on the thermo-switch itself – verify the
correct operation of the dryer.
8. The TS 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).
6. Reset the pressure-switch pressing the button on the controller itself - verify the dryer for
correct operation.
7. The PA 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.