25
Troubleshooting and Testing
EN
Table E: System Saver HP Series Air Dryer Troubleshooting
Condition
Possible Cause
Solution
Dryer leaks from purge valve
during compressor loaded
cycle. The leak may cause
excessive compressor cycling
or prevent the system from
building air pressure.
Purge valve frozen open
(cold weather operation).
Check heater. Repair/replace if necessary.
Make sure governor to dryer port 4 line is
free of water/oil.
Remove and inspect purge valve and
clean water/oil from top of piston.
Debris under purge valve
seat, such as particles from
fittings or air inlet line.
Remove purge valve cartridge and inspect
for contamination. Remove if possible, or
replace purge valve cartridge.
Remove desiccant cartridge and clean
sump area.
Turbo cut-off valve is
cracked or O-rings are
leaking.
Remove turbo cut-off valve. Clean dryer
bore and check for damage. Replace turbo
cut-off valve if damaged component is
found. Lubricate O-rings .
Leaks in governor signal
line between port 4 and
compressor.
Repair signal line or fittings as necessary.
Make sure downward slope of signal line
from compressor to dryer.
Regeneration cycle too long
(more than 30 seconds),
accompanied by loss of
pressure in the supply tank.
Outlet check valve not
seating.
Inspect and replace outlet check valve as
needed.
Regeneration cycle too short
(less than 10 seconds).
High air system demands
during compressor unloaded
cycle.
Increase air system capacity or reduce air
demands.
Air governor not working
correctly.
Verify that dryer governor is operating at
correct pressures and that signal changes
levels in one second or less. Replace if
necessary.
No regeneration cycle. No
airflow from purge valve
after initial purge blast (dryer
decompression).
Air dryer connections
reversed at dryer.
Verify correct dryer installation per system
diagram.
Blocked/contaminated,
internal dryer orifice
Replace dryer.
Air dryer does not purge when
compressor unloads (no blast
of air from purge valve).
Purge valve stuck closed.
Replace purge valve.
Air governor not working
correctly.
Inspect air governor. Repair/replace per
instructions.
Cut-out pressure never
achieved by air compressor.
Check for air leaks in system and repair
as needed. If no leaks in system, check
compressor output. Repair/replace per
manufacturer’s instructions.
Summary of Contents for SYSTEM SAVER HP MM1736
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