Discharge air temperature leaving the package stays high, driving moisture and dryer overload downstream.
1
Fins clogged with dust/oil film (air-cooled)
CheckVisual inspection; compare air-on vs air-off temperature to OEM spec approach.
FixBlow out fins with low-pressure air/brush from the clean side; degrease if oily.
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2
Cooling fan underperforming
CheckCheck fan rotation, blade condition, belt/motor condition, and airflow volume.
FixRepair/replace fan, belt, or motor; verify correct rotation.
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3
Water-cooled aftercooler scaled internally
CheckCheck cooling water inlet/outlet ΔT and flow rate against OEM spec.
FixChemically clean or mechanically ream tubes; treat cooling water per water-treatment plan.
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4
Condensate accumulation blocking tubes
CheckVerify aftercooler drain/separator is functioning.
FixRepair drain; clear blocked passages.
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5
Ambient air recirculation (hot exhaust returning to inlet)
CheckCheck room ventilation and ducting layout; measure inlet air temp vs outdoor/room temp.
FixImprove ducting to prevent recirculation; add louvers/exhaust fans.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.