14
SYMPTOM
POSSIBLE CAUSE(S)
CORRECTIVE ACTION
A) Water downstream of dryer
1. Residual free moisture remaining in
downstream pipelines.
2. Air bypass system is open.
3. Inlet and Outlet connections are reversed.
4. Temperatures surrounding air lines
downstream of dryer have dropped below
dryers dew point rating.
5. Excessive free moisture (bulk liquid) at dryer
inlet.
6. Condensate not being automatically drained
Drain mechanism is clogged or inoperative.
Drain line is restricted or frozen.
Electric drains-timer not set to allow for
sufficient condensate removal.
7. Dryer overloaded resulting in elevated dew
point.
8. Refrigeration system not functioning properly
resulting in elevated dew point.
9. Separator element not properly installed.
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.
Open drain line.
Electric drains-reset time so that all liquid is
discharged.
Check inlet air temperature and pressure, flow
rate (compressor capacity) and ambient air or
water temperature.
See D below.
Check element installation.
B) High pressure drop across
dryer
1. Excessive air flow
2. Freezing of moisture in evaporator because of
refrigeration system improperly functioning.
3. Inlet air strainer clogged.
4. Separator filter element clogged
Check flow rate.
See D below.
Clean inlet air strainer.
Replace filter element.
C) High Temperature Alarm
1. Dryer overloaded resulting in high air outlet
temperature.
2. Refrigeration system not functioning properly
resulting in high air outlet temperature.
3. Unit functioning normally but temperature
sensor is malfunctioning or not securely
mounted.
See A7.
See D below.
Contact qualified refrigeration repairman or
manufacturer’s service department. Check power
to unit.
D) Refrigeration system not
functioning properly
1. Power on light off
2. Compressor on light off
3. Refrigeration compressor
cycles on and off
a. Power failure
b. Line disconnect switch open
c. Blown fuses, open breaker
d. Faulty wiring, loose terminals
a. ON/OFF switch is “OFF”
b. Line disconnect switch open
c. Blown fuses, open breaker
d. Faulty wiring, loose terminals
a. High or low ambient conditions
b. Air-cooled - Dirty, clogged condenser fins,
obstructed flow across condenser, faulty fan
motor or fan control switch.
Check for power to unit
Close disconnect switch
Check for continuity
Have electrician check electrical connections.
Turn switch “ON”
Close disconnect switch
Check for continuity
Have electrician check electrical connections
Check min./max. temperature ranges
Clean condenser and check for free air flow, if
problem persists contact qualified refrigeration
repairman or manufacturer’s service department.
TROUBLESHOOTING GUIDE