14
TROUBLESHOOTING GUIDE
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
7. Dryer overloaded resulting in elevated
dew point.
8. Refrigeration system not functioning
1. Excessive air flow
2. Freezing of moisture in evaporator
because of refrigeration system fault
3. Filter loaded with solid particulates
a. Power failure; open circuit
a. Compressor commanded off by
manual switch or programmed
schedule
b. Open circuit
c. Control circuit open on high or low
pressure cutout
Service interval specified has elapsed
a. Hot gas by-pass valve requires
adjustment
b. Low on refrigerant
a. Lack of condenser cooling
Air-cooled - Ambient temperature too
high, clogged condenser fins,
obstructed flow across condenser,
faulty fan motor or fan control
switch.
Water-cooled - Cooling temperature
too high, flow too low, clogged
strainer, faulty water regulating valve
a. Hot gas by-pass valve requires
adjustment
a. Dryer overloaded
b. Refrigeration system off or not
cooling sufficiently
a. Drain line restricted or frozen
b. Drain mechanism faulty
Dryer left in the Set Mode for longer
than 30 seconds
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
See C below
See C below
See C below
Check flow rate
See C below
Replace filter element
Check for power to dryer
Check current command status
Check power to compressor
Check display for fault
Perform scheduled service
Contact qualified technician or
manufacturer’s service department
Check air temperature 6” in front
of condenser
Clean condenser and check for free
air flow
Check fan and switch operation
Check cooling medium temperature
and flow, clean strainer, check
valve operation
Contact qualified technician or
manufacturer’s service department
Check compressed air flow,
temperature, and pressure
Check power to unit, power to
compressor, Low or High pressure
faults Have qualified technician
evaluate system
Open drain line
Turn 3-way valve handle so it points out
from the front of the unit. Open and
adjust the manual petcock in rear leg for
manual draining.
Rebuild drain mechanism.
Finish programing and press
Set/Run button
SYMPTOM
POSSIBLE CAUSE(S)
CORRECTIVE ACTION
NOTE: After fault correction, press reset button to clear display
A) Water downstream of dryer
B) High pressure drop across dryer
C) Checkpoint faults
1. Power on/off light
2. Compressor on light off
3. Alarm/Service alert light on -
check Display for active
conditions
SERVICE DRYER
LOW PRESSURE
HIGH PRESSURE
NOTE: If high refrigerant
pressure occurs, switch
must be manually reset
LOW TEMPERATURE
(also observed as low reading on
temperature indicator)
HIGH TEMPERATURE
(also observed as high reading
on temperature indicator)
DRAIN
TIME OUT
Summary of Contents for 9VXRD Series
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