Johnson Controls York YHAU-C - Page 137

Table 24: Alarm list
Button label (alarm
name)
Cause of alarm and condition to reset Countermeasures
Abnormal Purge Freq.
(Abnormal Purge
Frequency)
• Purge frequency in a set time exceeded its
defined value, so chiller is suspected of poor air-
tightness.
• Press the ALARM RESET button to reset the
alarm.
Purge Abnormal
• Manual Purge OFF button was not pressed
during an automatic purge operation.
• Press the ALARM RESET button to reset the
alarm..
• Purge manually (according
to instructions shown in
Maintenance).
• Contact your local Johnson Controls
Service Center.
Chilled W. Overcool
Prevent. (Chilled Water
Overcool Prevention
Control)
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.
Refrig. Overcool Prevent.
(Refrigerant Overcool
Prevention Control)
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 resumes when the refrigerant
temperature rises.
• Check the equipment in cooling
load line.
• Check the chilled water flow.
• Check the chilled water flow control
system.
Gen. Hi Temp. Prevent.
(Generator High
Temperature Prevention
Control)
Generator solution temperature rose to its upper
limit or higher. The load limit operation was activated.
The alarm resets when the generator solution
temperature drops.
• Check the cooling water line.
• Check the cooling water flow rate.
• Check the cooling tower.
• Purge manually (according
to instructions shown in
Maintenance).
• Contact your local Johnson Controls
Service Center.
Gen. Hi Press. Prevent.
(Generator High Pressure
Prevention Control)
Generator pressure rose, then load limit operation
was applied. The alarm resets if the pressure falls
• Check the cooling water line.
• Check the cooling water flow rate.
• Check the cooling tower.
• Purge manually (according
to instructions shown in
Maintenance).
• Contact your local Johnson Controls
Service Center.
Cooling W. Tube Fouling
(Cooling Water Tube
Fouling)
Temperature difference between the absorber
temperature and cooling water inlet temperature
widened, so fouling of cooling water tube inside is
likely to be accumulated. Press the ALARM RESET
button to reset the alarm..
Check the cooling water line. Check the
cooling water flow.
Refrigerant Pump Stop
The refrigerant pump switch was set to OFF for one
hour or longer while the operation command was
output.
Press the Refrigerant Pump Auto button.
Low Cool. W. Inlet. Temp.
(Low Cooling Water Inlet
Temperature)
Cooling water inlet temperature fell to its lower limit
or lower during cooling operation, and then load
limit operation was activated. Alarm resets when the
cooling water inlet temperature rises.
Check the cooling water inlet
temperature control system.
High Cool. W. Inlet Temp.
(High Cooling Water Inlet
Temperature)
Cooling water inlet temperature rose to it’s upper
limit or higher during cooling operation, and the load
limit operation was activated. The alarm resets when
the cooling water inlet temperature drops.
• Check the cooling water inlet
temperature control system.
• Check the cooling tower.
135YHAU-C Single Effect Steam-Fired Absorption Chiller