Table 25 - Failure List - York YHAU-CW Manual

FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
The failures addressed in Failure section of this screen
are:

TABLE 25 - FAILURE LIST

BUTTON LABEL OPERATION
(FAILURE AT FAILURE
NAME) OCCURRENCE
Chilled W. Time
Out (Chilled
Water Time Out)
Not start
Cooling W. Time
Out (Cooling
Water Time Out)
Operation
Interlock
CW Pump
Interlock (Cooling
Stop after
Water Pump
dilution
Interlock)
Monitor Interlock
(Constant
Monitoring
Interlock)
Chilled W.
Suspension
(Chilled Water
Suspension)
Stop without
dilution
Chilled W.
Overcooled
(Chilled Water
Overcooled)
Refrigerant
Overcooled
Low Cool. W.
Inlet Temp. (Low Stop after
Cooling Water dilution
Inlet Temperature)
JOHNSON CONTROLS
CAUSE
Chilled water pump operation
interlock and/or chilled water
suspension relay was not
established within a set time
while start-up.
Cooling water pump operation
interlock was not established
within a set time while start-
up.
Operation interlock was not
established during solution
pump automatic operation.
Cooling water pump interlock
was not established during
cooling water pump operation
command output.
Constant monitoring interlock
was not established.
Chilled water flow was not
detected continuously during
solution pump automatic
operation.
Chilled water outlet
temperature was abnormally
low during cooling operation.
Low refrigerant temperature
during cooling operation, and
then refrigerant overcool relay
was activated.
Cooling water inlet
temperature had been kept
at its lower limit or lower for
30 minutes or longer during
cooling operation.
COUNTER MEASURES
• Check the chilled water pump.
• Check the chilled water line.
• Check the chilled water flow.
• Check the chilled water suspension relay.
• Check whether or not the pipe is clogged.
Check interlocked equipment.
Check the cooling water pump interlock.
• Check the components of the constant monitoring
interlock.
• If any of the components are not working, contact
your local Johnson Controls Service Center.
• Check the chilled water pump.
• Check the chilled water line.
• Check the chilled water flow.
• Check the chilled water suspension relay.
• Check whether or not the pipe is clogged.
• Check equipment in cooling load line.
• Check the chilled water flow.
• Check the chilled water flow control system.
• Contact your local Johnson Controls Service
Center.
• Check the chilled water line.
• Check the chilled water flow.
• Contact your local Johnson Controls Service
Center.
Check the cooling water inlet temperature control
system.
SECTION 6 – OPERATION
123
6