Aircel VF-10 Installation And Operation Manual page 22

Aircel VF Series - Models 10 - 1200
Troubleshooting Table, continued
Problem
Water downstream and
dryer system not working
properly or not working
(Cont).
Low air pressure
downstream or high
pressure drop across
the dryer system.
*Notice: To confirm
freeze-up, shut system
off for 20 min and allow
to thaw. Air pressure in
line should come back
to normal pressure.
22
Probable Cause
Refrigeration compressor
cycles on/off and cannot
maintain suction pressure,
dryer undersized.
Shorted fan motor
winding.
Fan motor overload or unit
short cycling.
Defective overload
protectors (fuses or
breakers).
Low voltage or 3-phase
imbalance.
Low water flow or
pressure to water-cooled
condenser.
Defective fan control
cycling switch.
Optional pre-filter element
dirty or plugged.
Suction pressure below
set point which causes
freezing in the dryer heat
exchanger.
Suction pressure below
set point which causes
freezing in the dryer heat
exchanger.*
Incorrect sizing or restriction
in compressed air line
piping.
Remedy
Check airflow (cfm) and dryer capacity. Reduce
airflow through dryer or replace with a larger
rated cfm dryer.
Check fan motor with ohmmeter and refer to
motor specifications for correct value. Check
wiring schematic to ensure proper wiring of fan
motor. Replace motor if required.
Check circuitry against electrical schematic
(wiring diagram). Check for high refrigerant
pressure or for high ambient temperature.
Check overload protectors and replace if
necessary.
Check incoming power supply, voltage must be
within 8-12% of rating on the serial plate label.
Check water flow and/or pressure and adjust
according to specifications. Contact technical
support for assistance
Replace fan control cycling switch.
Replace filter element.
Refrigeration controls may require adjustment,
contact technical support for assistance.
Refrigeration circuit low on refrigerant, locate
leak in refrigeration circuit, repair and recharge
according to specifications.
Check compressed air piping for restrictions.
Check piping size to verify if it has the capacity
to handle the rated scfm at present working
pressure of compressed air system.