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FB – PROTECTION OF FREQUENCY CONVERSION
Cause of Error
Tools Required
Possible Broken Part
Troubleshooting
Procedures
Cause: In routine operation of the unit, there will be times
where the unit will need to protect the compressor during
defrost, overheating, or undercooling. Three indicator lights
are used on the outdoor unit control panel to signify this
protection is occurring. The unit will protect the compressor
during defrosting, over current protection, cooling overload
protection, indoor heating high temperature protection, and
indoor cooling freezing protection.
Multimeter
Regular protection, system blockage, power supply,
resistance value of sensor drifts or is used wrong.
1.
Defrosting: If the unit defrosts frequently, please note
these possible causes: heat exchange of the external unit
is faulted, if the fan revolving speed is low and if the
resistance value of the coil sensor is wrong or the
temperature is inaccurately measured, or it is damaged.
2.
Over current protection: It is normal if such protection
appears under a very high temperature cooling status
but not under low temperature low load status.
3.
Cooling overload protection: When the outdoor coil
sensor senses the temperature is too high, as to provent
the compressor from overload, it would possitively lower
the frequency and it is normal for the protection under
the high temperature cooling status.
4.
Indoor high temperature heating protection: When the
indoor coil sensor senses the temperature is too high, as
to prevent the compressor from overload, it would
positively lower the frequency and it is normal for the
protection in a warm room.
5.
Indoor cooling freezing protection: When the indoor coil
sensor senses the temperature is too low, it would
possitively lower the frequency and it is normal for the
protection in a low temperature room.
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