Specifications

HighInletTemperatureRefrigeratedAirDryer
21
Problem Probable Cause Remedy
Water downstream and
dryer system not working
properly or not working
(Cont).
Refrigerationcompressor
short cycles and cannot
maintain suction pressure,
dryer undersized.
Checkairflow(cfm)anddryercapacity.Reduce
airflow through dryer or replace with a larger
rated cfm dryer.
Shortedfanmotor
winding.
Check fan motor with ohmmeter and refer to
motor specifications for correct value and check
wiring schematic to ensure proper wiring of fan
motor.Replacemotorifrequired.
Fan motor overload
cutting out or unit short
cycling.
Check circuitry against electrical schematic
(wiring diagram). Check for high refrigerant
pressure or for high ambient temperature.
Defectiveoverload
protectors (fuses or
breakers).
Check overload protectors and replace if
necessary.
Low voltage or 3-phase
imbalance.
Check incoming power supply, voltage must be
within 8-12% of rating on data plate.
Low water flow or
pressure to water-cooled
condenser.
Check water flow and/or pressure and adjust
according to specifications.
Defectivefancontrol
cycling switch.
Replacefancontrolcyclingswitch.
Low air pressure
downstream or high
pressure drop across
the dryer system.
Optional pre-filter element
dirty or plugged.
Replacefilterelement.
Suctionpressurebelow 
set point which causes
freezing in the dryer heat
exchanger.
Ifexpansionvalveisoutofadjustment,contact
an authorized service technician.
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.
Suctionpressurebelow
set point which causes
freezing in the dryer heat
exchanger.
Refrigerationcircuitlowonrefrigerant,locate
leak in refrigeration circuit, repair and recharge
according to specifications.
Incorrect sizing or restriction
in compressed air line
piping.
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.