York YK Style H Operation Manual page 176

LCSSS – Low Phase (X) Temperature Sensor
The Liquid Cooled Solid State Starter Logic/Trigger Board has detected that the temperature of the
starter phase A, B or C (designated as X in the message) Silicon Controlled Rectifier (SCR) Module
has decreased to less than 37°F. This would generally be indicative of a disconnected or defective
sensor. If all three SCR Modules are indicating a temperature of less than 37°F, the SCR Module
cooling pump turns on. This is accomplished by disconnecting all three sensors. This feature allows
Service Technicians to run the cooling pump while filling the cooling system by disconnecting plugs
P2, P3 and P4 in the LCSSS.
LCSSS – Run Signal
The Liquid Cooled Solid State Starter receives two start signals from the Control Center
simultaneously; one via the serial communications link and one via the start relay TB6-24 in the
Control Center. If they are not received within 5 seconds of one another, a cycling shutdown is
performed and this message is displayed. This is generally indicative of defective wiring.
LCSSS – Invalid Current Scale Selection
There is an invalid compressor motor current scale jumper combination installed in the Liquid
Cooled Solid Starter Logic/Trigger Board J1. Jumper combination determines allowable "100% FLA"
setpoint range; 7L-35 to 260A, 14L-65 to 510A, 26L-125 to 850A and 33L-215 to 1050A. The chiller will
be permitted to start when the jumpers are configured correctly. Refer to Solid State Starter (Mod
"B") – Operation and Maintenance (Form 160.00-O2) for valid jumper configurations.
LCSSS – Phase Locked Loop
The Liquid Cooled Solid State Starter Logic/Trigger Board phase locked loop circuit was not able to
maintain lock with phase A of the power line. This could be caused by a power line anomaly such
as sag or jitter. A power line frequency jitter of up to 3 Hz/second can be tolerated. The chiller will
automatically restart when lock has resumed.
LCSSS – Low Supply Line Voltage
The Liquid Cooled Solid State Starter Logic/Trigger Board has detected that the compressor motor
AC Power Line Voltage, in any phase, decreased below the low line voltage threshold continuously
for 20 seconds. The chiller will automatically restart when the voltage in all phases returns to the
restart level. The thresholds are as follows:
Table 178: Low supply line voltage thresholds
Supply voltage range (Volts)
Disabled
200-208
220-240
380
400
415
440-480
550-600
LCSSS – High Supply Line Voltage
The Liquid Cooled Solid State Starter Logic/Trigger Board has detected that the compressor motor
AC Power Line Voltage, in any phase, exceeded the high line voltage threshold continuously for 20
seconds. The chiller will automatically restart when the voltage in all phases returns to the restart
level. The thresholds are as follows:
176
Shutdown (Volts)
None
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center
160
185
305
320
335
370
460
Restart (Volts)
N/A
174
200
331
349
362
400
502