17
5.10 Alarm R2 - Early dew point breakthrough, right tower, drying cycle (Optional)
1. Desiccant bed overloaded
• See Section 5.2.1.
2. Insufficient sample flow to dew
• See Section 5.2.2.
point sensor (DPS)
3. Air sampling valve (V20) failed to switch
• See Section 5.2.3.
4. Dew point sensor (DPS) or monitor
• See Section 5.2.4.
damaged or defective
5. Loss of desiccant drying capacity
• See Section 5.2.5.
6. Incomplete regeneration
• Check for Alarm R6 (see Section 5.13).
5.11 Alarm R3 - Failure to depressurize, right tower, regeneration cycle
1. Faulty right tower pressure switch (PS2) • See Section 5.9.3.
2. Right depressurization muffler (M2)
• Examine inner core and clean or replace as necessary.
clogged
3. Right depressurization valve (V6)
• Check valve operation. Repair or replace as necessary.
failed to open
4. Right purge exhaust piping obstructed
• Ensure piping is free of obstructions.
5. Right purge valve (V4) failed to open
• Loss of pilot air - see Section 5.9.4.
• Right purge pilot valve (V14) failure - check valve operation. Repair or
replace as necessary.
• Right purge valve (V4) - examine valve and actuator for damage.
Repair or replace as necessary.
6. Repressurization valve (V15) failed
• See Section 5.3.6.
to close
5.12 Alarm R4 - Low or no blower pressure, right tower, regeneration cycle
1. Blower intake filter (F1) clogged
• Examine intake filter element and clean or replace.
2. Improper setting on blower pressure
• Check pressure switch operation. Readjust switch setting or replace
switch (PS3)
switch if defective.
3. Loss of pressure to blower pressure
• Check lines for leaks, cracks, loose fittings, etc. Repair as necessary.
switch (PS3)
4. Other alarms preventing motor starter
• Check for Alarms R3 (see Section 5.11) and R5 (see Section 5.13) and
from being energized
correct as necessary.
5. No power to motor
• Check wiring and control components in motor circuit. Repair as
necessary.
6. Low pilot air pressure (PPS)
• Check switch operation, check system pressure.
5.13 Alarm R5 - High heater element temperature, right tower, regeneration cycle
1. False alarm
• Heater hi-limit thermocouple - check thermocouple circuit for
continuity. Repair or replace as necessary.
• Heater hi-limit controller (TC2) or (TC4) malfunction - check controller
operation. Repair or replace as necessary.
2. Improper (high) setting on heater
• Adjust to factory setting.
outlet temperature controller (TC1)
3. Restricted or blocked purge air flow
• Dirty intake filter (F1) on blower - examine filter element and clean or
replace.
• Right purge valve (V4) failed to open - see Section 5.11.5.
• Right purge exhaust piping obstructed - ensure piping is free of ob-
structions.
• Right purge check valve (V10) failed to open - examine valve internals.
Repair or replace as necessary.
4. High temperature at blower discharge
• Left purge valve (V9) is leaking - see Section 5.7.6
• Restricted or blocked purge air flow - see Section 5.13.3.
POSSIBLE CAUSES
CORRECTIVE ACTION
