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When the system's
cooling outflow water
temperature ≥ the high
setpoint of the cooling
outflow water
System's
temperature for 3s,
cooling water
there will be fault
87
outlet
alarm;
temperature is
when the system's
too high
cooling outflow water
temperature ≥ the high
setpoint of the cooling
outflow water
temperature -6°C, the
fault will be released,
When the system's
chilled outflow water
temperature ≤ the low
setpoint of the chilled
outflow water
System's
temperature for 3s,
chilled water
there will be fault
88
outlet
alarm; when the
temperature is
system's shilled
too low
outflow water
temperature ≥ the low
setpoint of the chilled
outflow water
temperature +6°C, the
fault will be released
6.4. Fault Analysis
Fault
A No display on
controller
B compressor
stopped working
without obvious
reasons
C Noise and
excessive vibration
D Low suction
pressure alarm
E reduction of
refrigeration/heating
capacity
Cooke Industries - Phone: +64 9 579 2185
Main machine's
emergency stop
Main machine's
emergency stop
Causes
1. No power supply to the main
machine
2. Wiring error
3. Fault itself
1. Electronic control system fault
2. Fault of compressor itself
1. Noise from the compressor
2. Vibration echo caused by floor and
wall
1. Insufficient chilled water flow
2. Evaporator's filth blockage
3. Excessive low chilled water
temperature
4. Electronic expansion valve fault
1. Compressor fault
2. There is filth in water circulation
system of the heat exchanger
3. Insufficient refrigerant charge
volume
Email: sales@cookeindustries.co.nz
Automatically; If it occurs for three times within 1 hour, the circuit will be locked
Automatically; If it occurs for three times within 1 hour, the circuit will be locked
Maintenance method
1. Check power circuit breaker, fuse status
and power supply wiring
2. Contact professional service center
3. Contact professional service center
1. Contact professional service center
2. Contact professional service center
1. Contact professional service center
2. Check whether the base is in proper
installation
1. Check whether the system water flow
meets the operation requirements of the
unit
2. Clean the evaporator
3. Up-regulate the chilled water
temperature's set point
4. Contact professional service center
1. Contact professional service center
2. Clean heat exchanger's water circulation
system by chemical method
3. Fill correct amount of refrigerant
75
Maintenance
Web: www.cookeindustries.co.nz
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