Sullair SN55 User Manual page 77

SN55, SN55S, SN55V, SN75, SN75S, SN75V User Manual
Symptom
Line pressure rises
above unload pressure
set-point
Excessive compres-
sor fluid consumption
Pressure relief valve
opens repeatedly
Liquid water in com-
pressed air lines
Probable cause
Leak in control system caus-
ing loss of pressure signals
Inlet valve stuck open
Defective unload solenoid
valve
Plugged control line strainer
Defective blowdown valve
Clogged return line or orifice
Separator element damaged or
not functioning properly
Leak in the lubrication system
Excess fluid foaming
Fluid level too high
Defective pressure relief valve
Plugged separator
Plugged strainer in moisture
drain line
Water vapor condensation
from cooling and compression
occurs naturally
Defective drain solenoid valve
Inadequate drain timer settings
02250247-571 R04
Subject to EAR, ECCN EAR99 and related export control restrictions.
Remedy
Check for leaks.
Remove the intake hose and check for inlet
valve operation.
Check that the valve is open when de-ener-
gized. Replace if necessary.
Clean strainer (screen and O-ring replacement
kit available).
Check that separator/sump tank pressure is
exhausted to the atmosphere when the sole-
noid valve opens. Repair or replace if neces-
sary (kit available).
Clean strainer (screen and O-ring replacement
kit available).
Clean orifice.
Change separator.
Check all pipes, connections and components.
Drain and change.
Drain and change. Check that the compressor
temperature has not dropped below 170°F
(76.7°C).
Replace.
Check separator differential.
Clean and service strainer located in the line off
the bottom of the water separator.
Remove the water vapor from compressed air
prior to distribution through the air system.
Check operation of aftercooler and moisture
separator. Install a compressed air dryer sized
for the flow and dryness level required. (Note:
Filters may also be required to remove particu-
lates, liquid oil aerosols or for oil vapor removal.
Change cartridges as recommended by the fil-
ter manufacturer). Check all drain traps rou-
tinely to insure their proper operation. Maintain
them regularly.
Ensure valve opens and closes as signaled by
the STS Controller™.
Check STS Controller control drain interval and
drain time, and adjust accordingly. High humid-
ity conditions require longer drain times or more
frequent openings.
6: Maintenance
76