Air Handlers Envirofresh Series Instrukcja instalacji, obsługi i konserwacji - Strona 15
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Troubleshooting – General
FAULT
Low cooling output.
Frost coil fault light
indication.
Re-heat fault light (SHC
only) indication.
Supply airflow failed
indication.
Extract airflow failed
indication.
Filter dirty indication
Noise from fan section.
POSSIBLE CAUSE
Dirty filters.
Compressor fault.
Cooling hold off stat.
Indoor coil freezing.
Fan run on timer faulty.
Unit power isolated or
power cut, bypassing auto
controls.
Power isolated by fire
alarm interlock
Fan run on timer faulty.
Unit power isolated or
power cut, bypassing auto
controls.
Power isolated by fire
alarm interlock
Fan motor or drive failure
Fan motor or drive failure.
Dirty filters.
Transit straps not removed
SHC/TA
REMEDY / ACTION
Replace filters.
Refer to compressor section.
Check operation and settings.
Check operation and settings of the
indoor frost protection stat.
Check fan runs on to dissipate heat prior
to unit shut down. Replace if faulty and
reset heater cut out switch
Ensure unit shut down via automatic
controls. Reset heater cut out switch.
Switch off unit via automatic controls
prior to tests if possible. Reset heater cut
out switch.
Check fan runs on to dissipate heat prior
to unit shut down. Replace if faulty and
reset heater cut out switch
Ensure unit shut down via automatic
controls. Reset heater cut out switch.
Switch off unit via automatic controls
prior to tests if possible. Reset heater cut
out switch.
Inspect drive belts. Check motor winding
resistance and contactors. Inspect fan
pressure switch and tubing and replace.
Inspect drive belts. Check motor winding
resistance and contactors. Inspect fan
pressure switch and tubing and replace.
Change filters.
Remove.