York YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 operation manual

will be displayed if the Micro Board is configured for AUTO-RESTART AFTER POWER FAILURE. The Mi- cro Board is factory set for manual restart after power failure. To convert it to auto-restart after power failure, remove one of the two-pin program jumpers from the cloth bag located inside the Control Center and place it on the terminals labeled “Auto R” (J60) on the Micro Board.

MON XX:XX AM – POWER FAILURE

The chiller is shut down because there has been a power interruption or failure. When power is restored, the chiller can be restarted by pressing the COMPRES- SOR switch to STOP/RESET position and then to START position. This message will be displayed if the Micro Board is configured for MANUAL RESTART AF- TER POWER FAILURE. The Micro Board is factory set for manual restart after power failure. This has been accomplished by removing the two-pin jumper from the terminals labeled “Auto R” (J60) on the Micro Board.

AC UNDERVOLTAGE – AUTOSTART

The chiller is shut down because the MicroComputer Control Center was in RUN mode, displaying

SYSTEM RUN – LEAVING TEMP CONTROL , but the motor current was less than 10% FLA for 25 continuous sec- onds. This is indicative of an AC undervoltage condi- tion that has caused the start relay (1R) in the Micro- Computer Control Center to de-energize. This condi- tion is checked when the MicroComputer Control Cen- ter goes into RUN mode (after 30 second pre-lube). This condition can be caused by failure of any compo- nent that would cause a loss of the start signal from the Control Center. In essence, this check assures that the compressor is running when the Control Cen- ter is displaying

SYSTEM RUN – LEAVING TEMP CONTROL .

This check is not performed when program jumper JP4 is removed (Steam Turbine applications).

MON XX:XX AM – INTERNAL CLOCK – AUTOSTART

The operator-programmed daily stop schedule has shut down the chiller. The chiller will automatically restart when the operator-programmed daily start schedule indicates a start. It can be overriddden by pressing the COMPRESSOR switch to the START position.

REMOTE STOP

This message will be displayed when a remote device (typically an Energy Management System) has com- manded the chiller to shut down. The chiller will restart upon application of a separate start signal from the remote device. This message will only be displayed

FORM 160.49-O2

when Control Center is in REMOTE mode.

ANTI-RECYCLE, XX MIN LEFT

The chiller may not restart more frequently than every 30 minutes. Displayed when chiller is shut down and there is time remaining on the anti-recycle timer. In normal operation, chiller cannot be restarted until

ANTI-RECYCLE, 00 MIN LEFT is displayed. However, when servicing the chiller, it may be desirable to inhibit this 30-minute timer. If so, simply install a jumper plug in the unmarked terminals of the Micro Board directly under Auto-Restart jack.

This feature eliminated when program jumper JP4 is removed (Steam Turbine applications).

WARNING: Remove this jumper after servicing. Failure to do this voids the Warranty.

MON XX:XX AM – LOW EVAP PRESSURE

The chiller is shut down because the evaporator pres- sure has decreased to 54.3 PSIG (R-22); 25.0 PSIG (R-134a). The chiller will be allowed to start when the pressure increases to 54.4 PSIG (R-22); 25.1 PSIG (R-134a). To restart chiller, press the COMPRESSOR switch to the STOP/RESET position and then to the START position.

MON XX:XX AM – LOW EVAP PRESSURE – BRINE

The chiller is shut down because the brine Low Evapo- rator Pressure (LEP, not included with standard Con- trol Center) safety contacts have opened. The brine LEP safety is located external to the Control Center. Safety cut-out settings will vary with the brine applica- tion. To restart the chiller, wait until the safety contacts close, press the COMPRESSOR switch to the STOP/ RESET position and then to the START position.

MON XX:XX AM – LOW OIL PRESSURE

The chiller is shut down because the oil pressure has decreased to 15 PSID while running, or never achieved 25 PSID prior to compressor start during the oil pump pre-lube run. The chiller will be allowed to restart when the pressure increases to 25 PSID. Differential pres- sure is sensed by two pressure transducers. To re- start chiller, press COMPRESSOR switch to STOP/ RESET position and then to the START position.

MON XX:XX AM – HIGH PRESSURE

The chiller is shut down because condenser pressure

YORK INTERNATIONAL 25