DRYAIRE REFRIGERATED AIR DRYERS
7
Troubleshooting
Problem
Cause
Solution
Water downstream of dryer.
Residual free moisture remaining in down-
stream pipelines.
Air bypass system is open.
Inlet and outlet connections are reversed.
Temperatures surrounding air lines down-
stream of dryer have dropped below dry-
ers dew point rating.
Excessive free moisture (bulk liquid) at
dryer inlet.
Condensate not being automatically
drained. Drain mechanism is clogged or
inoperative or drain line is restricted or fro-
zen.
Dryer overloaded resulting in elevated
dew point.
Refrigeration system not functioning prop-
erly resulting in elevated dew point.
Blow out system with dry air.
Check valve positions.
Check for correct connection.
Insulate or heat trace air lines exposed to
low ambients or dry air to lower dew point.
Install separator ahead of dryer.
Replace drain mechanism if inoperative,
or open drain line.
Check inlet air temperature and pressure,
flow rate (compressor capacity) and ambi-
ent air temperature.
See “Refrigeration system not functioning
properly,” page 8.
High pressure drop across dryer
Inlet air strainer clogged.
Excessive air flow.
Separator filter clogged.
Freezing of moisture in evaporator
because of refrigeration system improp-
erly functioning.
Clean inlet air strainer.
Check flow rate.
Replace filter sleeve.
See “Refrigeration system not functioning
properly,” page 8.
Fault Alarm
Dryer overloaded resulting in high air out-
let temperature.
Refrigeration system not functioning prop-
erly resulting in high air outlet tempera-
ture.
Unit functioning normally but thermostatic
switch is malfunctioning or not securely
mounted.
Check inlet air temperature and pressure,
flow rate (compressor capacity) and ambi-
ent air temperature.
See “Refrigeration system not functioning
properly,” page 8.
Contact qualified refrigeration repairman
or manufacturer’s service department.
