NANO VDR 2600, Instruction Book, Page: 85 / 96

Before carrying out any maintenance or repairs on the dryer, stop the dryer and
switch off the voltage.
Open the isolating switch to prevent an accidental start.
Isolate the dryer from the air net and depressurize by opening valve (5) on
outlet collector (6).
Faults and remedies (general)
Condition Fault Remedy
Pressure dew-point too
high Air inlet temperature too
high Check and correct; if necessary,
install a pre-cooler
Ambient temperature too
high
Check and correct; if necessary,
draw cooling air via a duct from a
cooler place or relocate dryer
Air inlet pressure too low Increase inlet pressure
Dryer capacity exceeded Reduce air flow
Shortage of refrigerant
Have circuit checked for leaks and
recharged
Refrigerant compressor
does not run
See below
Evaporator pressure too
high
See below
Condenser pressure too
high
See below
Automatic drain system
clogged
Have the system cleaned
Condenser pressure too
high or too low on air-
cooled dryers
Fan or fan motor out of
order
Check fan/fan motor
Fan control switch out of
order
Replace
No signal to fan Check run enable signal
Ambient temperature too
high
Check and correct; if necessary,
draw cooling air via a duct from a
cooler place or relocate dryer
Condenser externally
clogged
Clean condenser
Condenser pressure too
high or too low on water-
cooled dryers
Cooling water system
clogged
Have cooling water system cleaned
Cooling water
temperature too high
Check and correct as necessary
Compressor stops or does
not start
Electric power supply to
compressor is
interrupted
Check and correct as necessary
Instruction book
2987 2020 00 83