7
4.0 TROUBLESHOOTING GUIDE
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. Air lines downstream of dryer are exposed
to temperatures below the dew point.
5. Excessive free moisture (bulk liquid) at
dryer inlet.
6. Condensate not being 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
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
B) High pressure drop across dryer
1. Excessive air flow
2. Freezing of moisture in evaporator
because of refrigeration system fault
3. Separator filter element clogged
Check flow rate
See D below
Replace filter element
C) Dew point indicator in red area
1. Dryer overloaded resulting in high air
outlet temperature
2. Refrigeration system not functioning
properly resulting in high air outlet
temperature
See A 7
See D below
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.
