Troubleshooting SFD Dryer Systems cont’d
¼ tubing connecting air control valve and valve
housing and/or manifold damaged or missing
Possible Cause Remedy Kit ID's
System pressure exceeds 200 psi (13.7 bar) relief
valve setting
Pressure control valve malfunction Replace pressure relief valve service kit H
Possible Cause Remedy Kit ID's
Desiccant cartridges require service Replace desiccant cartridges - service kit A
Desiccant cartridge contaminated
Micro Logic Timer (MLT) malfunctioning Replace Micro Logic Timer (MLT) G
(PLC) malfunctioning Replace Programmable Logic Control (PLC) Q
Pneumatic Control unit malfunctioning Replace Pneumatic Control Unit assembly (PC) E
Air control valve malfunctioning Replace air control valve assembly E
Regeneration valve malfunctioning Replace regeneration valves C
1/4" tubing connecting air control valve and valve
housing and/or manifold damaged or missing
Worn, stuck or clogged purge valve
Purge Valves incorrectly serviced
Compressed air usage exceeds drying capacity of
dryer system
Water in air dryer inlet/purge valve frozen Replace heater assemblies L
Air dryer does not exhaust every two minutes Replace heater assemblies L
Air dryer will not exhaust (purge) under 32º F Replace heater assemblies L
Repair or replace ¼ tubing and check all fittings for cracks or leaks
Inoperable Heaters (if equipped)
Dryer will not cycle (switch) approximately 60 seconds Class 1 Div 2 (PC Models only)
Contact SKF customer service 1 888 SKF FIRST
Contact SKF customer service 1 888 753 3477 or local SKF
representative
Inadequate air flow (volume) down stream from air dryer (all models)
Align exhaust ports in purge valve as detailed within service kit
Repair or replace ¼ air line tubing
Replace purge valve assemblies
Replace desiccant cartridges - service kit
Contact SKF Customer Service 1 888 SKF FIRST
Water in air system (all models)
Pressure relief valve opens (all models)
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