York YK-EP B Operation & Maintenance Manual page 165

FORM 160.87-OM1
ISSUE DATE: 8/24/2018
Warning – Condenser Or VGD Sensor Failure
The difference between the Stall Pressure transducer
output and the Condenser Pressure transducer output
has exceeded 0.28VDC for 3 continuous minutes while
the chiller was running. This feature verifies the opera-
tion of the Stall transducer and the Condenser trans-
ducer. Since both transducers are measuring essentially
the same pressure, both outputs should be within the
specified tolerance. This message must be manually
cleared. It will be displayed until the transducer out-
puts are within the acceptable range of each other and
the WARNING RESET key in SERVICE access level.
While this message is displayed, the Variable Geom-
etry Diffuser (VGD) is driven to the full open position
and held there until this warning is manually cleared.
When cleared, the VGD returns normal operation.
Warning – Conditions Override VGD
An extreme stall condition has been detected while the
chiller was running. An extreme stall condition exists
when the Stall Detector Voltage (output of the Stall De-
tector Board) exceeds twice the High Limit setpoint for
the duration programmed in the Extreme Stall Dura-
tion Setpoint (10 to 20 minutes). While this message is
displayed, the compressor Variable Geometry Diffuser
(VGD) is driven to the full open position and held there
until the message is manually cleared. This protects the
VGD ring from possible damage from an extreme stall
condition. This message can be cleared after the Stall
Detector Voltage returns to less than two times the
High Limit Setpoint and the WARNING RESET key is
pressed in SERVICE access level.
The extreme stall condition is not checked under the
following conditions:
• While the VGD is in manual control mode.
• While the VGD is fully closed (VGD Limit
Switch closed).
• While the Pre-Rotation Vanes position is greater
than the PRV VGD INHIBIT Setpoint.
Warning – Motor Bearing Lube Suggested
The Operating Hours Since Last Motor Lubrication has
exceeded 1000 hours. This will be displayed until man-
ually cleared by the Operator or the Operating Hours
Since Last Motor Lubrication exceed 1200 hours,
whereupon it is replaced by the message WARNING
– MOTOR BEARING LUBE REQUIRED below. The
Operator clears this message by entering his/her ini-
tials, name or user ID in OPERATOR access level (or
JOHNSON CONTROLS
SECTION 3 - DISPLAY MESSAGES
higher) using the MOTOR LUBE ACKNOWLEDGE
key on the MOTOR LUBRICATION Screen. Refer to
the Motor Lubrication Screen on Page 107 for entry
instructions. The date and time of this entry is automati-
cally logged as the Date Of Last Motor Lubrication and
Time Of Last Motor Lubrication. It also resets the Op-
erating Hours Since Last Lubrication to zero. The date
this warning occurs is stored as the Date Of Last Motor
Lubrication Warning Or Fault. This warning message
will not be displayed if the Auto Lube Setpoint on the
MOTOR LUBRICATION Screen enabled.
Warning – Motor Bearing Lube Required
The Operating Hours Since Last Motor Lubrication has
exceeded 1200 hours. This replaces WARNING – MO-
TOR BEARING LUBE SUGGESTED above. This is
displayed until manually cleared by the Operator or the
Operating Hours Since Last Motor Lubrication exceed
1400 hours, whereupon it is replaced by the message
Motor – Lack Of Bearing Lubrication below. The Op-
erator clears this message by entering his/her initials,
name or user ID in OPERATOR access level (or high-
er) using the MOTOR LUBE ACKNOWLEDGE key
on the MOTOR LUBRICATION Screen. Refer to the
Motor Lubrication Screen on Page 107 for entry in-
structions. The date and time of this entry is automati-
cally logged as the Date Of Last Motor Lubrication and
Time Of Last Motor Lubrication. It also resets the Op-
erating Hours Since Last Lubrication to zero. The date
this warning occurs is stored as the Date Of Last Motor
Lubrication Warning Or Fault. This warning message
will not be displayed if the Auto Lube Setpoint on the
MOTOR LUBRICATION Screen enabled.
Warning – Motor – High Winding Temperature
This warning occurs when any of the enabled Motor
Winding Temperatures exceeds the following: [High
Winding Temperature Shutdown threshold - 18°F] for
3 continuous seconds. This warning will automatically
clear when all winding temperatures decrease below
the warning threshold. The value programmed for the
above threshold is displayed as High Winding Temper-
ature Shutdown on the MOTOR SETPOINTS Screen.
It is programmed with the Winding Setup Setpoint on
that screen. This warning not occur when the Wind-
ing Temperature Protection Setpoint is set to Disabled
on the MOTOR DETAILS Screen. Also, it will not act
on any RTD input registering as an open RTD or any
individual winding temperature sensor that has been
disabled with the Temperature Disable Setpoint on the
MOTOR SETPOINTS Screen.
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