Air Handlers Envirofresh Series Manual de instrucciones de instalación, funcionamiento y mantenimiento - Página 14
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Imprimir páginaTroubleshooting – General
FAULT
Unit not operating.
No Supply or Extract fans
running.
No air volume.
Low air volume, fans
running, air flow fail on.
No heating or cooling
Low heating output or air
volume.
POSSIBLE CAUSE
No power to unit.
Time clock output.
Fire link open.
Defective damper end
switch.
No power to fans
Fan drive or motor failure
Filters blocked
Incoming phases crossed.
Temperature controller
Fan drive or motor failure
Refrigeration fault.
Compressor fault
indication.
Dirty filters.
Defective recovery damper
actuator (SHC).
Filters freezing.
Frost coil not operational.
Outdoor coil freezing.
Re-heat coil not
operational.
REMEDY / ACTION
Check isolator, mains supply.
Check settings.
Inspect fireman‟s panel.
Check actuator operation and end switch
making when open.
Check control switch, fuses, MCB`s and
control circuit wiring.
Inspect drive belts. Check motor winding
resistance. Inspect fan pressure switch
and tubing and replace.
Remove packaging or replace.
Check fan rotation. If incorrect change
mains incoming unit phases over. Not
individual fans.
Adjust set point control. Check
operation.
Inspect drive belts. Check motor winding
resistance. Inspect fan pressure switch
and tubing and replace.
Refer to refrigeration section.
Refer to refrigeration section.
Replace filters.
Check bypass damper closed on heating
demand. Replace if faulty.
.
Check frost coil.
Check set points on thyrister controller
and check operation.
Check defrost stat operation.
Investigate operation of main step
controller.