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Problem C: Excessive pressure drop across unit.
Model
Potential Cause
Verification
Corrective Action
C1
All Current
operating
conditions do not match
the unit's specifications.
Verify that the maximum flow rate for the unit
is not being exceeded. Contact the factory if
you require sizing data for your model.
Reduce the outlet
flow rate.
C2
All
Dirty or obstructed 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.
C3
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.
C4
All
Plugged air passages.
Check inlet and outlet air passages and
piping for blockages.
Clear restrictions.
C5
All
Solenoid coil burned out. Listen for proper purge cycle. Once removed
from the unit, the magnetic field from coil can
also be checked with a screw driver or nail.
Contact PUREGAS
for a replacement
solenoid valve
assembly.
C6
PHF
PCDA
PCME
PHCA
Check valve ball not
seated properly.
Remove desiccant towers, orifice plugs, and
inspect condition of check ball and spring for
excessive wear or damage.
Replace check ball
and spring.
C7
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.
