Sullair SD-300 - SECTION 7: TROUBLE SHOOTING & FAULTS; 7.1. THE DEW POINT IS TOO HIGH; 7.2. THE DRYER DOES NOT SWITCH TOWERS

INSTALLATION, START-UP & MAINTENANCE MANUAL
SD-220 TO SD-600
REV 04 – 10 Oct 2003
Page 30 of 32
SECTION 7: TROUBLE SHOOTING & FAULTS
7.1. THE DEW POINT IS TOO HIGH
Possible Cause Solution
Operating pressure too low, air flow capacity too high Increase operating pressure, reduce air flow capacity
Air inlet temperature too high Reduce temperature, or connect an air cooler upstream
Differential pressure at the pre-filter too high Check filter element for impurities, change if necessary
Condensate drain is not functioning Check operation of the condensate drain and replace if
necessary
Desiccant is soiled or has disintegrated Check pre-filter for impurities and either change the filter
element and change the complete desiccant and dispose of
the old desiccant
Volume of regeneration gas too low Check regeneration orifice for soiling, clean if necessary;
check operation of silencer and blow-off valve, replace if
necessary.
Back pressure in regenerating vessel Check if mufflers are clogged or if there is any valve leak.
7.2. THE DRYER DOES NOT SWITCH TOWERS
Possible Cause Solution
The Inlet valve combination does not open or switch Check the electrical functioning of the solenoids and replace
either the solenoid or the complete valve combination
PLC does not function Check PLC and the fuse in the control cabinet
The vessel is not pressurized Check whether the blow-off valves are dirty and replace these
if necessary; Check the electrical functioning of the solenoids
and replace either the solenoid or the complete valve
combination
The regeneration orifice is obstructed Clean or replace the regeneration orifice