19
3.8.4 - Locating and clearing alarm
Fig. 22 - List of alarm messages and
their causes and remedies
Display and content of alarm
Alarm of the chilled water and/or cooling water system
Check that the discharge pressure of both chillled-
Chilled water temperature is too low.
water and cooling water pumps is normal.
Chilled water flow alarm
→
If not, the strainer may be clogged, or there may
be an air leak in the piping, etc.
Is the chilled-water setpoint too low?
Cooling water temperature is too low
→
Correct it to the specified setpoint.
Cooling water flow alarm (option)
Is the cooling water setpoint too low?
→
Correct it to specified setpoint (e.g. 28°C).
Correct the above causes and restart the chiller.
If the "CHILLER ALARM" continues, check the
following and contact your Carrier service agent:
• Entering and leaving chilled/hot water temperature
• Entering and leaving cooling water temperature
• Generator temperature and pressure
Alarm of the motor(s)
First check that the reset button(s) of the
Absorbent pump overload alarm.
overload relay connected to the electromagnetic
contactor is not pushed in, and then contact your
Carrier service agent.
Refrigerant pump overload alarm
Reset buttons
Alarm of the auxiliary equipment
Chilled water pump interlock alarm.
Check that the chilled/hot water pump and cooling
water pump are rotating.
→
Start the pumps
Cooling water pump interlock alarm.
Check the fan and/or other equipment connected
to the system interlock.
Correct the above causes and restart the chiller.
If the "CHILLER ALARM" continues, contact your
Carrier service agent.
Cooling tower fan overload alarm.
Generator alarm
Check that the cooling water pump is rotating.
Generator temperature is too high.
→
Start the pump.
Check that the cooling water line valve is open.
→
Open the valve.
Generator pressure is too high.
Check that the cooling water pump discharge
pressure of is normal.
→
If not, the strainer may be clogged, or there may
be an air leak in the piping, etc.
High concentration of absorbent
Correct the above causes and restart the chiller
If the "CHILLER ALARM" continues, check the
following and contact your Carrier service agent:
• Entering and leaving chilled-water temperature
• Entering and leaving cooling water temperature
• Generator temperature and pressure.
• Is the chilled water setpoint too low?
→
Correct it to the specified setpoint.
• Water in the heat transfer tubes may be fouled
(especially cooling water).
3.8.2 - Troubleshooting flowchart
Symptoms
Action
An alarm occurs.
Alarm buzzer sounds (option), and the
indication light of the "STOP" key blinks.
The alarm message is shown in the data
display.
Press the "BUZZER STOP" key on the
control board.
The alarm buzzer stops (option).
Check alarm message and solve the problem.
Press the "STOP" key on the control board
after the troubleshooting is completed.
The indication light of the "STOP" key
stops blinking and remains lit. The alarm
code on the data display disappears.
NOTES:
1. The data display still shows an alarm, when
the "STOP" key is pressed. Check the
alarm message, before cancelling the alarm.
2. If a combustion alarm occurs, operation
does not restart without pressing the reset
button on the burner controller.
Start operation
Operation restarts.
3.8.3 - Alarm message and setpoint
Fig. 21 - List of alarms and setpoints
in cooling operation
Purpose
Display
Alarm message
Setpoint
Protection of
Chilled water temperature is too low.
2.5°C or below
chilled water
Chilled water pump interlock alarm.
-
system
Chilled water flow alarm
50% or below
Cooling water temperature is too low.
24°C or below
after 30 minutes
Prevention of
Cooling water pump interlock alarm.
-
Crystallisation
Cooling water flow alarm
50% or below
Generator temperature is too high.
105°C
Protection of
Generator pressure is too high.
101.3 kPa or above
high
temperature
High concentration of absorbent
65% or above
generator
twice
65.5% or above
Protection of
Absorbent pump overload alarm.
Rated current
motor
Refrigerant pump overload alarm.
value or above
Purge pump overload alarm.
"
Others
Fan interlock etc. alarm.
"
Efficiency is too low.
-
Cooling tower fan overload alarm.
