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Haier CI0193AANB Installation, Operation And Technical Manual page 49

Air cooled semi-hermetic screw chiller
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11.2.4.1 Piping system failure
① Cycling water cut-off: when the cycling water stop flow or the flow volume is too low, the target
flow controller in this cycling pipe will activate and control the system alarm, units will stop respectively.
Startup the chiller manually after cycling water system is normal.
② Cooling water outlet temperature is too low: the control system will alarm when the cooling
water outlet temperature is less than 3℃ and the chillers will stop respectively during cooling mode,
until the temperature reach 6℃ and failure had been eliminated, the chiller can be started manually.
③ Warm water outlet temperature is too high: the control system will alarm when the warm water
outlet temperature is over 60℃ and the chillers will stop respectively during heating mode, until the
temperature reach 50℃ and failure had been eliminated, the chiller can be started manually.
④ Power protector protection: power protector can protect the phase sequence, lack of voltage
and over voltage of 3-phase, the protector is normally open.
11.2.4.2 Compressor system failure
① High/low pressure protection: the unit will check the comparative between the suction pressure
and setting value of suction pressure (alarm when less than the setting value), the discharge pressure
and setting value of discharge pressure (alarm when more than the setting value), press 【Reset】 on
the touch screen after troubleshooting, the compressor will restart.
② Oil level too low: the control system will alarm and compressor will stop if the oil level switch
has opened for 60 seconds during compressor working. Press 【Reset】 on the touch screen after
troubleshooting, the compressor will restart.
③ Pressure difference of oil filter is too high: the control system will alarm and compressor will
stop if the pressure difference switches beside oil filter have opened for 60 seconds during compressor
working. That means the oil filter blocked and need to be cleaned. Press 【failure reset】 on the touch
screen after troubleshooting, the compressor will restart.
④ Compressor electrical controller protection: the main influence factors of compressor inner
electrical controller protection are: motor of compressor overheat, discharge temperature too high. The
compressor will stop when electrical controller actives, the compressor can be restarted after failure
disappeared. Once failure occurs, the touch screen will display "Failure" automatically no matter what
condition the unit in.
⑤ Compressor discharge temperature protection: when the detect value of discharge
temperature is higher than its setting protection value, resume when it is lower than its setting value - 5
℃. Once failure occurs, the touch screen will display "Failure" automatically no matter what condition
the unit in.
⑥ Compressor overload protection: control system alarm when the running current is higher than
the relay setting value for protection, compressor stops once failure occurs.
11.2.5 Checkup process
Though the control cabinet has been checked systemically before out of factory, but because of
time or other possible deleterious factors, check the chiller carefully before using.
49
HAIER CHILLER

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