Troubleshooting Guide 5 - 1
5
TroubleshootingGuide
Dew point degradation
1. Insufficient or excessive purge gas flow
during regeneration.
2. Inlet gas pressure is below the design pres-
sure specified on the Dryer Specification La-
bel located on the inside cover of the dryer
control system enclosure.
3. Inlet gas flow (SCFM) is above the dryer’s
design flow rate.
PROBLEM/POSSIBLE CAUSE CHECKS AND REMEDY
1. Refer to the Calculation of Purge Pressure Setting instructions
in Appendix A (refer to Appendix C for -100°F pdp). Ensure that
the dryers purge flow has been properly calculated and adjusted.
2. Check the dryer’s inlet pressure and correct if necessary. The
efficiency of the dryer decreases as the inlet pressure de-
creases.
3. Verify the actual flow rate through dryer. Reduce flow rate if op-
erating above the inlet flow rate specified on the Dryer Specifica-
tion Label located on the inside cover of the dryer control system
enclosure.
WARNING!
Ensure that the Dryer and any associated Prefilters and Afterfilters are valve isolated and fully depressurized before
attempting to remove or disassemble any subassemblies or components. Failure to do so may result in serious
personal injury and/or equipment damage.
WARNING!
Some of the following troubleshooting checks require entering the Dryer Control System enclosure while the
Dryer’s Electrical Power Supply is energized. THEREFORE, A POTENTIAL ELECTRICAL SHOCK HAZARD EXISTS.
These checks should be conducted by a qualified electrical technician or a Deltech authorized field service engi-
neer ONLY. The Dryer’s Electrical Power Supply must be de-energized before any electrical maintenance or re-
pair work is conducted.
CAUTION: Do not open or enter the Dryer Control System without exercising proper precautions for Static Sensitive De-
vices. Do not remove the factory programmed microcomputer chip or any I.C. chip from the Logic Control Circuit Board.
Improper removal or handling will cause irreparable damage to these highly Static Sensitive components. Damage to these
components will render the Dryer Control System inoperative until replacement is accomplished by a Deltech authorized field
service engineer. Do not remove the program identification sticker from the microcomputer chip.
Important: Water molecules can diffuse through a pinhole size leak even though pressure inside the piping is several hun-
dred PSIG. It is not at all uncommon to have a minute pinhole leak in a gas line cause an increase in dew point from -40°F
to -10°F at a distance of forty or more feet downstream of the leak.