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Troubleshooting Guide 5 - 3
Back pressure on a desiccant chamber during the
regeneration cycle. (Chamber’s pressure gauge
indicates above zero (0) PSIG.
Note: The presence of back pressure will result
in insufficient regeneration followed by dew point
degradation. An off-stream chamber’s pressure
gauge MUST indicate zero (0) PSIG throughout
all regeneration cycles.
1. Purge Adjusting Valve is supplying excessive
purge gas to regenerating chamber as indi-
cated by the Purge Pressure Indicator
(gauge).
Note: If correct setting is unknown, refer to
the Calculation of Purge Pressure Setting in-
structions in Appendix A.
2. Purge or Outlet Check Valve seat is worn,
damaged, or fouled (allowing slight pressure
leakage to enter regenerating chamber).
3. Off-stream chamber’s Inlet Switching Valve
or on-stream chamber’s Purge Exhaust
Switching Valve seat is worn, damaged or
fouled (allowing slight pressure leakage to
enter regenerating chamber).
Loss of power to Operating Status and Alarm
Indicators (no illumination). (Both chambers
are at line pressure, as indicated by the left and
right chamber pressure gauges.)
1. Loss of power supply to (or at) dryer’s electri-
cal disconnect switch, or breaker (customer
supplied).
2. Loose connections at customer power con-
nections (H, N, GND).
3. Control system’s power fuse (F1) is blown.
4. Damaged components.
1. SLOWLY rotate Purge Adjusting Valve until correct purge pres-
sure setting is noted on the Purge Pressure Indicator.
Note: The purge pressure setting can only be read and ad-
justed when the off-stream chamber has depressurized for re-
generation. When the off-stream chamber is pressurized the
Purge Pressure Indicator will read system pressure.
2. Shutdown and Depressurize Dryer. Refer to the Purge and
Outlet Check Valve Maintenance procedure which is applicable
to your specific dryer model. Disassemble, clean and inspect
the Purge and Outlet Check Valves. Replace all worn or dam-
aged components as noted.
3. Shutdown and Depressurize Dryer. Refer to the Inlet Switch-
ing Valve and Purge Exhaust Switching Valve Maintenance pro-
cedures which are applicable to your specific dryer model. Dis-
assemble, clean and inspect the Inlet Switching Valves and
Purge Exhaust Switching Valves. Replace all worn or damaged
components as noted.
1. Check power disconnect switch (or breaker) CLOSED. If tripped
breaker or blown fuse is noted, investigate and remedy cause.
2. De-energize Dryer Power Supply. Check power supply input
wiring connections (H, N, GND).
3. De-energize Dryer Power Supply. Replace fuse if blown, in-
vestigate and remedy cause.
4. For damaged solid state components and/or circuit boards of
microprocessor units, contact your local Deltech Sales Repre-
sentative for assistance.
PROBLEM/POSSIBLE CAUSE CHECKS AND REMEDY