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 increase the orifice size and/or size of 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 the 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.

A7

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.

A8

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.

A9

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.

A10

PCR

Purge flow restricted.

Check mufflers for excessive back-pressure.

Replace mufflers.

Model

Potential Cause

Verification

Corrective Action

B1

All

The purge orifice size is larger than what is required for the current operating conditions.

Verify that the orifice size corresponds to the actual operating pressure and flow rate.Contact the factory if you require sizing data for your model.

Resize the dryer by replacing the orifice(s) with a smaller size.

B2

PCR
PMD

Inlet or outlet shuttle disc not shifting.

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.

Line pressure too low at inlet: Increase the operating pressure or resize the purge orifice for the new conditions.

B3

PCR
PMD

Inlet or outlet shuttle disc not shifting.

Depressurize the system, remove shuttle valve assembly, and check for damage or contamination of inside the valve body.

Replace or clean valve body and disc. Check condition of inlet filtration (A6) and desiccant (A3).

B4

All

Timer not operating properly.

Check for incoming voltage fluctuations caused by inductive devices (eg. electric motors) on the same circuit.

Supply line voltage from another source.

B5

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.

B6

All

Air leaks.

Remove electrical power from unit while it is pressurized. Check purge ports and joints for significant leaks using soapy water.

Repair as necessary.

B7

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.

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.