JOHNSON CONTROLS
112
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
SECTION 6 – OPERATION
FAILURE
NAME
OPERATION
AT FAILURE
OCCURRENCE
CAUSE
COUNTER MEASURES
Control Sensor
Abnormal
Stop after
dilution
Temperature sensor and/
or pressure sensor detected
abnormal value due to
disconnection, short circuit,
etc.
• Tighten terminal in control panel.
• Contact your local Johnson Controls Service Center.
CPU Abnormal
Stop after
dilution
CPU was judged to be
abnormal.
Contact your local Johnson Controls Service Center.
Solution
Pump Inverter
Abnormal
(Option)
Stop without
dilution
Solution pump inverter
protection function was
activated, and the inverter
output was suspended.
• Check indication of inverter alarm code.
• Contact your local Johnson Controls Service Center.
Alarm
When an alarm occurs, an audible alarm does NOT
sound (buzzer). The type of alarm lights up in the
Alarm section of the screen. To view the details of the
alarm and the remedy, press the lighted button (the
name of the alarm).
After fixing the alarm, press the
ALARM RESET
but-
ton to reset the lighted alarm button. If you press the
ALARM RESET
button before fixing the alarm, the
lit alarm button will not go out.
TABLE 31 -
ALARM LIST
ALARM NAME
CAUSE OF ALARM AND
CONDITION TO RESET
COUNTER MEASURES
Abnormal Purge
Frequency
Purge frequency within a set time exceeded
its defined value, therefore chiller-heater is
suspected of poor air-tightness, etc.
Alarm is reset via alarm reset.
• Purge manually (according to instructions in
SECTION 7- MAINTENANCE
on
).
• Contact your local Johnson Controls Service Center.
Purge Abnormal
Purge switch was not turned OFF while
automatic purge operation.
Alarm is reset via alarm reset.
Chilled Water
Overcool Prevention
Low chilled water outlet temperature
during dilution operation, and then dilution
operation was interrupted (cooling water
pump, solution pump, and refrigerant pump
operations were suspended). The dilution
operation resumes when the chilled water
outlet temperature rises.
• Check the equipment in cooling load line.
• Check the chilled water flow.
• Check the chilled water flow control system.
Refrigerant
Overcool Prevention
Low refrigerant temperature during
dilution operation, and then the dilution
operation was interrupted (cooling water
pump, solution pump, and refrigerant
pump operations were suspended). The
dilution operation is resumed if refrigerant
temperature rises up.
TABLE 20 -
FAILURE LIST (CONT'D)
