Troubleshooting; Temperature - Devair DRD 200 Instruction Manual

TROUBLESHOOTING GUIDE
SYMPTOM
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
LOW TEMPERATURE
(also observed as low reading
on temperature indicator)
HIGH TEMPERATURE
(also observed as high reading on
temperature indicator)
DRAIN
TIME OUT
NOTE: After fault correction, press reset button to clear display
For Sales & Service Call: 705-722-5747 Ext.1
10
POSSIBLE CAUSE(S)
1. Residual free moisture remaining in
downstream pipelines
2. Air by-pass 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
CORRECTIVE ACTION
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 ro 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 to horizontal position
and open petcock for manual draining.
Rebuild drain mechanism.
Finish programing and press
Set/Run button