York YST Operation Manual page 137

FORM 160.67-O1
ISSUE DATE: 4/1/2015
"Warning – lead hotwell pump fault"
This message only applies to chillers equipped with
dual hotwell pumps when MSSP10-Hotwell Pump
Mode on Configuration Screen 1 is set for Dual. It
appears when the lead hotwell pump contactor auxiliary
contact has failed to close within 5 seconds after
the run output was energized to start the pump. The
standby pump has been started in order to continue the
start up or operation of the chiller. This message is also
displayed if the auxiliary contact opens anytime the run
output is on indicating that the pump motor protector
in the Power Panel may have stopped the pump. This
message will be displayed until the Warning Reset Key
on the Home Screen is pressed in the OPERATOR (or
higher) access mode. This also resets the standby pump
start logic so that the faulted pump (if fault condition
has been corrected) can again be used for standby
operation without shutting down the chiller.
" Warning – lead vacuum pump Sealing
Water no flow"
This message only applies to chillers equipped with
dual vacuum pumps when MSSP11-Vacuum Pump
Mode on Configuration Screen 1 is set for Dual. It
appears when the lead vacuum pump sealing water
flow switch has not closed within 10 seconds after the
lead pump sealing water solenoid has been energized.
The standby pump sealing water solenoid has been
energized to start the standby pump in order to continue
the start up or operation of the chiller. This message is
also displayed if the sealing water flow switch opens
while the associated solenoid is energized indicating
a possible failure of the solenoid coil. This message
will be displayed until the Warning Reset key on the
Home Screen is pressed in the OPERATOR (or higher)
access mode. This also resets the standby pump start
logic so that the faulted sealing water solenoid (if fault
condition has been corrected) can again be used for
standby operation without shutting down the chiller.
"Warning – lead vacuum pump fault"
This message only applies to chillers equipped with
dual vacuum pumps when MSSP11-Vacuum Pump
Mode on Configuration Screen 1 is set for Dual. It
appears when the lead vacuum pump sealing water
flow switch has not closed within 10 seconds after the
lead pump sealing water solenoid has been energized or
the lead vacuum pump contactor auxiliary contact has
failed to close within 5 seconds after the run output was
energized to start the pump. The standby pump sealing
water solenoid has been energized to start the standby
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
pump in order to continue the start up or operation of
the chiller. This message is also displayed if the sealing
water flow switch opens while the associated solenoid
is energized indicating a possible failure of the solenoid
coil. It is also displayed if the vacuum pump motor
contactor auxiliary contact opens anytime the run
output is on indicating that the pump motor protector
in the Power Panel may have stopped the pump. This
message will be displayed until the Warning Reset Key
on the Home Screen is pressed in the OPERATOR (or
higher) access mode. This also resets the standby pump
start logic so that the faulted sealing water solenoid or
pump (if fault condition has been corrected) can again
be used for standby operation without shutting down
the chiller.
"Warning – vacuum pump overrun"
This message only applies to chillers equipped with
steam ejectors and a single vacuum pump on the
steam condenser when MSSP11-Vacuum Pump Mode
on Configuration Screen 1 is set for Ejector. The
message appears if the vacuum pump has been running
continuously for 15 minutes after the Chiller is in the
System Run Mode. This could indicate either an ejector
malfunction or a major leak in the steam condenser or
exhaust piping. This message will be displayed until
the Warning Reset key on the Home Screen is pressed
in the OPERATOR (or higher) access mode. This also
resets the overrun timer so that the message will appear
again if the vacuum pump starts and runs continuously
for 15 minutes.
" Warning – Mechanical overspeed Test in
progress"
The operator has pushed the Overspeed Test key on
the Auto/Manual Screen. The software overspeed
shutdown at the SSP8-Overspeed Shutdown setpoint
shown on the Alarm/Shutdown Setpoints Screen is
disabled to allow the operator to manually increase the
Speed Setpoint up to the SSP4-Overspeed Test Limit
shown on the Speed Setpoints Screen.
"Warning – Conditions override vgd"
The Stall Detector Voltage exceeded twice the High
Limit for the Extreme Stall Duration, the VGD control
is disabled and the VGD is opened. This message will
be displayed until the Stall Detector Voltage is less than
twice the High Limit setpoint and the Warning Reset
key on the Home Screen is pressed in the SERVICE (or
higher) access level.
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