Troubleshooting SFD Dryer Systems
Possible Cause
Remedy
Item
Worn inlet check valves (O-rings)
Clean cavities and replace valve assemblies included in
service kit
A,D
Worn purge valve or dirt/foreign material stuck in
purge valve
Clean cavities and replace purge valve assemblies included
within service kit
A,D
Regeneration valve not closing
Clean cavities and replace regeneration valve assemblies
within service kit
C
NOTE: Light air flow of 1.6 cfm from either exhaust port (muffler) is normal as this represents the
regeneration cycle
Heavy air flow from exhaust ports (all models)
Inlet Valve
Retainer
O- rings
Inlet Location
Purge Valve
Seal Retainer
O- rings
Purge Location
Regeneration Valves
(#619708) Red = .016" (max 27 cfm)
(#619716 ) Black = .030" (max 40 cfm)
(#619730) White = .060" (max 400 cfm)
(#619731) Blue = .090" (max 800 cfm)
Prior to serial
number #xxxxxx
all regeneration
valves white
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