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Maintenance
75
87
System’s
cooling water
outlet
temperature is
too high
When the system’s
cooling outflow water
temperature
≥
the high
setpoint of the cooling
outflow water
temperature for 3s,
there will be fault
alarm;
when the system’s
cooling outflow water
temperature
≥
the high
setpoint of the cooling
outflow water
temperature -6°C, the
fault will be released,
Main machine’s
emergency stop
Automatically; If it occurs for three times within 1 hour, the circuit will be locked
88
System’s
chilled water
outlet
temperature is
too low
When the system’s
chilled outflow water
temperature
≤
the low
setpoint of the chilled
outflow water
temperature for 3s,
there will be fault
alarm; when the
system’s shilled
outflow water
temperature
≥
the low
setpoint of the chilled
outflow water
tempe6°C, the
fault will be released
Main machine’s
emergency stop
Automatically; If it occurs for three times within 1 hour, the circuit will be locked
6.4. Fault Analysis
Fault
Causes
Maintenance method
A No display on
controller
1.
No power supply to the main
machine
2.
Wiring error
3.
Fault itself
1.
Check power circuit breaker, fuse status
and power supply wiring
2.
Contact professional service center
3.
Contact professional service center
B compressor
stopped working
without obvious
reasons
1. Electronic control system fault
2. Fault of compressor itself
1.
Contact professional service center
2.
Contact professional service center
C Noise and
excessive vibration
1.
Noise from the compressor
2.
Vibration echo caused by floor and
wall
1.
Contact professional service center
2.
Check whether the base is in proper
installation
D Low suction
pressure alarm
1.
Insufficient chilled water flow
2.
Evaporator’s filth blockage
3.
Excessive low chilled water
temperature
4.
Electronic expansion valve fault
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
E reduction of
refrigeration/heating
capacity
1.
Compressor fault
2.
There is filth in water circulation
system of the heat exchanger
3.
Insufficient refrigerant charge
volume
1.
Contact professional service center
2.
Clean heat exchanger’s water circulation
system by chemical method
3.
Fill correct amount of refrigerant
Cooke Industries - Phone: +64 9 579 2185 Email: [email protected] Web: www.cookeindustries.co.nz