Table 27: Failure list
Failure name
Operation at
failure occurrence
Cause
Counter measures
Chilled/Hot Water
Suspension
Chilled/Hot water flow suspension
had been detected continuously
during solution pump automatic
operation.
•
Check the chilled/hot water
pump.
•
Check the chilled/hot water
line.
•
Check the chilled/hot water
flow.
•
Check the chilled/hot water
suspension relay.
•
Check whether or not the
pipe is clogged.
Chilled Water
Overcooled or
High Hot Water
Temperature
Chilled water outlet temperature
was abnormally low during cooling
operation. Hot water outlet
temperature increased abnormally
during heating operation
•
Check equipment in cooling
load line.
•
Check the chilled/hot water
flow.
•
Check the chilled/hot water
flow control system.
•
Contact your local Johnson
Controls Service Center.
Refrigerant Overcooled
Stop without dilution
Low refrigerant temperature
during cooling operation, and then
refrigerant overcool relay was
activated
•
Check the chilled water line.
•
Check the chilled water
flow.
•
Contact your local Johnson
Controls Service Center
Constantly Monitoring
Interlock
Constant monitoring interlock was
not established.
•
Check the components of
the constant monitoring
interlock.
•
If any of the components
are not working, contact
your local Johnson Controls
Service Center.
Combustion
Monitoring Interlock
Stop after dilution
Combustion monitoring interlock
was not established during
combustion.
•
Check equipment
connected as combustion
monitoring interlock
components.
•
Contact your local Johnson
Controls Service Center.
Low Cooling Water
Inlet Temperature
Stop after dilution
Cooling water inlet temperature had
been kept at its lower limit or lower
for 30 minutes or longer during
cooling operation
Check the cooling water inlet
temperature control system.
Cooling Water
Suspension (Option)
Stop without dilution
Cooling water suspension detected
continuously during solution pump
automatic operation while cooling
operation.
•
Check the cooling water
pump.
•
Check the cooling water
line.
•
Check the cooling water
flow.
•
Check the cooling water
suspension relay.
•
Check whether or not the
pipe is clogged.
125
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
