KRSD series
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Fault
Probable cause
Remedy
Discharge air
temperature too
high
Bad vent condition, Oil lacking etc.
Check the vent condition and lubricant
level, etc.
Temperature
Sensor Failure
Cable off or PT1OO damaged
Check the wiring and PT100.
Over Pressure
Pressure too high or pressure
sensor failure.
Check the pressure and the pressure
sensor.
Pressure Sensor
Failure
Cable off, Sensor damaged or cable
connection inverted.
Check the wiring and sensor.
Phase Loss
Power phase lacking or Contactor
terminal damaged.
Check the power and contactors
Overload
Voltage too low, pipes blocked,
damaged bearings or other
mechanical problem; wrong set
data etc.
Check the set data, voltage, bearings,
pipes and mechanical system.
Unbalance
Current unbalance, contactor
damaged or internal open circuit of
the motor.
Check the power, contactors and motor.
Wrong Phase
Sequence
Reversed phase sequence.
Check the wiring
Overload or
rotor lock during
starting process
Motor start time set to a value
lower than the star-delta time
delay.
Reset the motor start time to be higher
than star-delta delay + Load delay time.
Main contactor
activates from
time to time.
Loose emergency button.
Check the wiring.
Servicing
KRSD compressors require the minimum amount of inspection and maintenance. The
controller and indicator alerts the operator to perform required maintenance or repair unit
problems.
6.1 FLUID CHANGE
KRSD series compressors utilize a pressurized fluid drain. Use the following procedure to
drain and replace the compressor fluid.
i.Press the emergency stop button and remove the right side cabinet panel (if
applicable).
ii.Check the pressure gauge reading on reservoir and wait until reservoir pressure
drops to approximately 0.5Bar (7psig).
