Table 28: 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.
Alarm is reset through alarm reset.
Purge Abnormal
Purge switch was not turned off during automatic purge
operation. Alarm is reset through alarm reset.
•
Purge manually (according
to instructions in
).
•
Contact your local Johnson
Controls Service Center.
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.
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 increases.
•
Check the equipment in
cooling load line.
•
Check the chilled water flow.
•
Check the chilled water flow
control system.
Cooling Water Tube
Fouling
Temperature difference between the absorber temperature
and cooling water inlet temperature widened, that results in the
likely accumulation of fouling of cooling water tube inside. The
alarm is reset through alarm reset.
•
Check the cooling water line.
•
Check the cooling water
flow.
•
Contact your local Johnson
Controls Service Center.
HG Tube Fouling
Temperature difference between the exhaust gas temperature
and HG temperature widened, that results in the likely
accumulation of fouling of HG tube inside. The alarm is reset
through alarm reset.
Contact your local Johnson
Controls Service Center.
Refrigerant Pump Stop The Refrigerant Pump
Stop
button has been pressed for 1 hour
or longer while operation command was output.
Press the Refrigerant Pump
Auto
button.
HG High Pressure
Prevention
HG pressure increased and the load limit operation was
activated. The alarm is reset when the HG pressure reaches 85.3
kPa.
HG High Temperature
Prevention
High generator solution temperature and load limit operation
was activated. The alarm is reset when solution temperature
reaches 316°F (158°C).
HG High Concentration
Prevention Control
High solution concentration and load limit operation was
activated. The alarm is reset when after 60 seconds.
•
Check the cooling water line.
•
Check the cooling water flow
rate.
•
Check the cooling tower.
•
Purge manually.
•
Contact your local Johnson
Controls Service Center.
Low Cooling Water Inlet
Temperature
Cooling water inlet temperature decreased to its minimum
limit or lower during cooling operation, and then load limit
operation was activated. Alarm is reset when the cooling water
inlet temperature increases.
Check the cooling water inlet
temperature control system.
High Cooling Water
Inlet Temperature
Cooling water inlet temperature increased to or higher than
its maximum limit or higher during cooling operation, and the
load limit operation was activated. The alarm is reset when the
cooling water inlet temperature falls.
•
Check the cooling water inlet
temperature control system.
•
Check the cooling tower.
Recording Sensor
Abnormal
Chilled/hot water inlet temperature sensor, cooling water inlet
temperature sensor, and/or absorber temperature sensor
detected abnormal value, due to disconnection, short circuit,
or other sensor/wiring disconnects. Remote setting signal was
abnormal during remote SP mode (remote chilled/hot water
outlet temperature setting mode) Alarm is reset through alarm
reset after temperature returns to normal.
•
Check the remote setting
signal.
•
Tighten the terminal.
•
Contact your local Johnson
Controls Service Center.
Low Battery Voltage
Voltage level of the battery in the control board fell down.
Alarm is reset through alarm reset after replacement of the
battery in the control board.
Replace the battery on the PWB.
127
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
