Puregas PCDA, Instruction Manual

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Problem A: Expected outlet dewpoint or purity is not met.
Model Potential Cause Verification Corrective Action
A1 All Current operating
conditions do not match
the unit's specifications.
Verify that the actual operating
pressure and inlet/outlet flow rates
match the specified performance of
the unit. Contact the factory if you
require sizing data for your model.
Reduce the outlet flow
requirements, increase the
operating pressure, or resize the
dryer by increasing the orifice
size and/or the size of the
desiccant towers.
A2 PHF
PCDA
PCME
PHCA
Sealing surface of
solenoid valve core
deteriorated, resulting in
air leakage.
Remove and inspect solenoid valve
core by unscrewing valve assembly
from bottom of manifold.
Purchase solenoid repair kit from
PUREGAS and replace solenoid
core and base.
A3 All Desiccant tower
contamination.
Check inlet filtration for proper
operation and inspect outlet air line
for evidence of oil.
Replace or repack desiccant
towers. Replace or install proper
inlet filtration. See Maintenance
Section for details.
A4 PHF
PCDA
PCME
PHCA
Desiccant tower attrition. Remove chamber and depress
perforated disc at open end of tower.
If perforated disc can be
depressed more than 1/4" from
the retaining ring, replace or
repack desiccant towers.
A5 All Solenoid coil burned out. Listen for a distinctive “click” when
the solenoid is energized.
Contact PUREGAS for a
replacement solenoid valve
assembly.
A6 All Inlet air temperature
exceeds specified
maximum.
Inlet air temperature should not
exceed maximum for operating
conditions (usually 70ºF or 100ºF).
Reduce inlet air temperature or
resize dryer.
A6 All Dirty or obstructed inlet
air filter element.
Check service life indicator on top of
filter (if equipped) or inspect filter
element surface for coating of dirt or
condensate.
Replace filter element.
A7 All Purge orifice plugged. Remove and inspect purge orifice. Clean hole of debris using an air
gun. Do not force a wire through
the critically drilled orifice.
A8 All Timer defective. Measure the output voltage from the
timer, as per the cycle and voltage
of your model. See Maintenance
Section for more information.
Replace timer if defective.
A9 All Purge flow restricted. Check mufflers or purge piping for
excessive back-pressure.
Replace mufflers or oversize
piping for purge (if so equipped).