7
FIELD SERVICE GUIDE
PROBLEM
SYMPTOM
POSSIBLE CAUSE
REMEDY
Water downstream of
dryer.
No discharge from no loss drain
valves.
Drain valve failure or accumulation
of dirt in drain valve strainer.
Dismantle drain valve: clean, repair or replace.
See maintenance section.
Inlet air temperature is too high.
Aftercooler malfunction.
Check aftercooler discharge temperature.
Reduce temperature to 122°F (50°C) max.; reduce
airflow if temperature is above 95°F (35°C).
Liquid water entering dryer.
Aftercooler drain valve malfunction.
Dismantle aftercooler drain valve; clean, repair or
replace.
Excessive airflow (may also cause
high pressure drop).
Dryer improperly sized.
Check airflow and dryer capacity (See Engineering
Data Tables).
Reduce airflow or resize and replace dryer.
Compressor cuts out on internal
overload.
Inadequate ventilation of refriger-
ant compressor.
Ensure adequate ventilation of the condensing unit
(see Clearance).
Motor will restart automatically when compressor
is cool.
Leak in refrigeration system.
Locate leak, repair and recharge. Motor will restart
automatically when compressor is cool.
Compressor windings read open or
shorted.
Compressor burned out.
Have a refrigeration mechanic check and replace.
The dew point level is red on LCD
window.
Inlet air temperature too high.
Reduce aftercooler discharge temperature to design
conditions (See Engineering Data Tables).
Excessive airflow.
Check airflow and system capacity. Reduce airflow or
resize and replace system.
Condenser fouled or clogged.
Clean or replace condenser.
Fan motor inoperative.
Replace fan motor.
High ambient temperature.
Ventilate area.
See Engineering Data Tables.
High pressure drop
across dryer.
Inlet air temperature is too low.
Low ambient temperature.
Consult your local distributor.
Excessive airflow (may also cause
water downstream of dryer).
Dryer improperly sized.
Check airflow and dryer capacity. Reduce airflow or
resize and replace dryer.
Dryer icing up.
Adjust operating conditions to meet sizing condi-
tions.
No condensate from
no loss drain valve.
Valve venting. But no condensate
from valve.
Accumulation of dirt in valve
strainer.
Dismantle valve strainer.
Strainer clean or replace.
Valve continuously venting.
Clogged valve orifice.
Replace valve.
Short in electrical component.
Check and replace connector or controller assembly.
Valve not cycling.
No electrical power.
Check and correct power supply and connections.
Drain valve malfunction.
Replace drain valve.
No response when test button is
pushed.
No electrical power.
Check and correct power supply and connections.
Burn out fuse.
Check solenoid coil and wiring cable and replace
fuse.
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