PREVOST X3-45 Multiplex, Руководство по обслуживанию

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Troubleshooting
Problem Cause Repair
Water in air
1. Contaminants in desiccant. 1. Change desiccant cartridge. Check
system
compressor for excessive oil passage.
2. Leaks in air system. 2. Tighten air connections, soap
connection and recheck for leaks per
Testing the DRY
est section.
Constant
1. Defective dryer outlet check valve. 1. Clean valve seat and replace
exhaust of air
check valve.
at air dryer
2. Dryer unloading valve not closing. 2. At compressor cut-out there
must
be a
and not
slight blow of regenerated air from the
Blow-Thru Type
purge tank for approximately 30
seconds. If air flow continues, replace
valve pack.
Excessive
1. Excessive leaks in air system. 1. Tighten air connections, soap
compressor
connection and recheck for leaks.
cycling
2. Defective dryer outlet check valve. 2. Clean valve seat and replace
check valve.
3. Undersize compressor, duty cycle of 3. Reduce air demand or use greater
compressor should not exceed 25%. output compressor.
Safety valve
1. Desiccant cartridge is plugged. 1. Excessive oil passage from compressor.
is open
Check for worn compressor. Replace
desiccant cartridge.
2. Ice block in dryer. 2. Check heater function.
3. Excessive system pressure. 3. Repair or replace governor.
Short life of
1. Air at inlet of dryer exceeds 170°F. 1. Extend length of compressor discharge
dryer or
line; see Installing the DRY est section.
desiccant
The 170°F dryer inlet temperature can
cartridge
usually be accomplished with 12’ to 15’
of compressor discharge line.
2. Duty cycle of compressor does not 2. During normal operation the compressor
allow for sufficient time for must remain unloaded for a minimum
desiccant regeneration. of 30 seconds to allow for sufficient
purge. Lengthy loading times must be
avoided. Air dryer must be “by-passed”
in applications with high air use such as
bulk unloading.
Poor drying
1. Air at inlet of dryer exceeds 170°F. 1. Extend length of compressor discharge
efficiency
line; see Installing the DRY est section.
The 170°F dryer inlet temperature can
usually be accomplished with 12’ to 15’
of compressor discharge line.