York YK Style H Operation Manual page 189

This shutdown must be evaluated by a qualified Service Technician prior to starting the chiller. Starting
the chiller without this evaluation could result in severe compressor damage. To prevent the chiller
from starting without the proper evaluation, restart is inhibited until the clearance is within +10 to -25
mils of the Reference Position and a special reset procedure is performed by the Service Technician.
The evaluation and reset procedure are contained in OptiView Control Center - Service Instructions (Form
160.76-M1).
Thrust Bearing – Limit Switch Open
(Chillers with P, Q, G or H5-8 compressors)
The High Speed Thrust Bearing Limit Switch contacts, connected to TB3-81, have opened. This
occurs when the Bearing position decreases to less than the allowed position.
This shutdown must be evaluated by a qualified Service Technician prior to starting the chiller. Starting
the chiller without this evaluation could result in severe compressor damage. To prevent the chiller
from starting without the proper evaluation, restart is inhibited until the switch contacts have closed
and a special reset procedure is performed by the Service Technician. The evaluation and reset
procedure are contained in OptiView Control Center - Service Instructions (Form 160.76-M1).
Watchdog – Software Reboot
The Microboard's software Watchdog initiated a Microprocessor reset because it detected that a
portion of the chiller operating program was not being executed. The result of this reset is a safety
shutdown and re-initialization of the program. This is generally indicative of a severe electrical
power disturbance or impending Microboard Failure. The chiller can be started after the Clear Fault
key is pressed on the display.
Surge Protection – Excess Surge
(Applies only if Surge Protection Shutdown feature is Enabled)
The Surge Window Count surge events exceeded the Count Limit Setpoint. If the Surge Protection
Extended Run feature is Disabled, the chiller shuts down as soon as the count exceeds the limit. If
the Extended Run feature is Enabled, this shutdown occurs only if the count exceeds the limit at
completion of the 10 minute Extended Run period. The chiller can be started after the Clear Fault
key is pressed on the display.
Motor – Lack of Bearing Lubrication
The Operating Hours Since Last Motor Lubrication has exceeded the setpoint hours plus 200.
This message replaces WARNING MOTOR BEARING LUBE REQUIRED above. This safety shutdown
remains in effect until the Operator presses the Clear Fault key on the display. and enters his/
her initials, name or user ID in OPERATOR access level (or higher) using the MOTOR LUBE
ACKNOWLEDGE key on the MOTOR LUBRICATION Screen. See
instructions. The date and time of this entry is automatically logged as the Date Of Last Motor
Lubrication and Time Of Last Motor Lubrication. It also resets the Operating Hours Since Last
Lubrication to zero. The date this warning occurs is stored as the Date Of Last Motor Lubrication
Warning Or Fault. This message will only be displayed if the Auto Lube Setpoint is disabled. With
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center
CAUTION
CAUTION
theMotor lubrication screen for entry
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