York YHAU-CW - TABLE 26 - Alarm List

JOHNSON CONTROLS
125
SECTION 6 – OPERATION
FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
6
TABLE 26 - ALARM LIST
BUTTON LABEL
(ALARM NAME)
CAUSE OF ALARM AND
CONDITION TO RESET
COUNTER MEASURES
Abnormal Purge
Freq. (Abnormal
Purge Frequency)
• Purge frequency within a set time
exceeded its dened value, therefore chiller
is suspected of poor air-tightness, , or other
air leakages.
• Press the ALARM RESET button to clear
the alarm.
• Purge manually (according to instructions in
SECTION 7 – MAINTENANCE).
• Contact your local Johnson Controls Service Center.
Purge Abnormal
(Purge System
Abnormal)
• Purge switch was not turned OFF while
automatic purge operation.
• Press the ALARM RESET button to clear
the alarm.
Ch. W. Overcool
Prevent. (Chilled
Water Overcool
Prevention Control)
Low chilled water outlet temperature during
dilution operation. The dilution operation was
interrupted (cooling water pump, solution
pump, and refrigerant pump operations were
suspended). The dilution operation resumes
if the chilled water outlet temperature rises.
• Check the equipment in cooling load line.
• Check the chilled water ow.
• Check the chilled water ow control system.
Refrig. Overcool
Prevent.
(Refrigerant
Overcool Prevention
Control)
Low refrigerant temperature during dilution
operation. The dilution operation was
interrupted (cooling water pump, solution
pump, and refrigerant pump operations were
suspended). The dilution operation resumes
if refrigerant temperature rises.
HG Hi Press.
Prevention (HG
High Pressure
Prevention Control)
HG pressure rose and the load limit
operation was activated. The alarm resets if
the HG pressure falls.
• Check the cooling water line.
• Check the cooling water ow rate.
• Check the cooling tower.
• Purge manually (according to instructions in
SECTION 7 – MAINTENANCE).
• Contact your local Johnson Controls Service Center.
HG Hi Temp.
Prevention (HG
High Temperature
Prevention Control)
High generator solution temperature and
load limit operation was activated. The alarm
resets if the HG temperature falls.
Cooling W. Tube
Fouling (Cooling
Water Tube Fouling)
• Temperature difference between the
absorber temperature and cooling water
inlet temperature widened. Fouling of
cooling water tube inside is likely to be
accumulated.
• Press the ALARM RESET button to clear
the alarm.
• Check the cooling water line.
• Check the cooling water ow.
Refrigerant Pump
Stop (Refrigerant
Pump Stop Time
Out)
The Refrigerant Pump Stop button was
pressed. The refrigerant pump has been off
for 1 hour or more..
Press the Refrigerant Pump Auto button.
Low Cool W.
Inlet Temp. (Low
Cooling Water Inlet
Temperature)
Cooling water inlet temperature fell down
to its lower limit or lower during cooling
operation, and then load limit operation was
activated. The alarm resets if 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 or
above it's upper limit or higher during cooling
operation, and the load limit operation was
activated. The alarm resets if the cooling
water inlet temperature falls.
• Check the cooling water inlet temperature control
system.
• Check the cooling tower.